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HomeMy WebLinkAboutCT 02-01; PACIFIC VIEW CONDOMINIUMS; STORMWATER MGMT AND MAINTENANCE PLAN; 2003-09-23• STORMWATER MANAGEMENT AND MAINTENANCE PLAN FOR PACIFIC VIEW CONDOMINIUMS CORNER OF JUNIPER AVENUE AND CARLSBAD BOULEVARD CARLSBAD, CALIFORNIA PREPARED BY EXCEL ENGINEERING 440 State Place Escondido, CA 92029 (760) 745-8118 September 23, 2003 I TABLE OF CONTENTS INTRODUCTION 1. PROJECT DESCRIPTION 1.1. PROJECT LOCATION 1.2. PROJECT SITE DESCRIPTION 1.3. WATERSHED CONTRIBUTION 2. APPLICABLE LAWS, REGULATIONS, POLICIES, AND REQUIREMENTS 2.1. CLEAN WATER ACT 2.2. STATE LAWS AND REGULATIONS 2.3. STATE IMPAIRED WATERBODIES 3. POTENTIAL EFFECTS TO THE WATER QUALITY ENVIRONMENT 3.1. BENEFICIAL USES 3.2. INLAND SURFACE WATERS 3.3. GROUNDWATER 4. CHARACTERIZATION OF PROJECT RUNOFF 4.1. STORM WATER QUALITY 4.2. TRIBUTARY DRAINAGE AREA 4.3. SITE HYDROLOGY 5. MITIGATION MEASURES (BMP's) TO PROTECT WATER QUALITY 5.1. CONSTRUCTION BMP's 5.2. INTERIM DEVELOPMENT BMP's 5.3. POST CONSTRUCTION BMP's 6. MAINTENANCE STORMWATER MANAGEMENT PROGRAM 7. REFERENCES 8. ATTACHMENTS 8.1.1. ATTACHMENT 1 - VICINITY MAP 8.1.2. ATTACHMENT 2 - CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD REGION MAP 8.1.3. ATTACHMENT 3 - THE 303d LIST 8.1.4. ATTACHMENT 4 - WATER QUALITY STANDARDS INVENTORY DATABASE 8.1.5. ATTACHMENT 5 - HYDROLOGIC UNIT MAP/DRAINAGE BASIN 8.1.6. ATTACHMENT 6 - HYDROLOGY STUDY 8.1.7. ATTACHMENT 7 - SWPPP 8.1.8. ATTACHMENT 8 - SSM ATTACHMENT G-1, CONSTRUCTION POLLUTANTS 8.1.9. ATTACHMENT 9 - CONSTRUCTION BMP's 8.1.10. ATTACHMENT 10 - POST CONSTRUCTION BMP's 8.1.11. ATTACHMENT 11 - ENHANCED TREATMENT CONTROL BMP SELECTION MATRIX (U, L, M, H) 8 1.12. ATTACHMENT 12 - FILTRATION SAMPLES 8.1.13. ATTACHMENT 13 - SCHEDULE & COSTS FOR MAINTENANCE OF POST CONSTRUCTION BMP's 8 1 14. ATTACHMENT 14 - CONSTRUCTION BMPs PLANS (SWPPP) 8 1 15 ATTACHMENT 15 - POST CONSTRUCTION BMPs PLANS 1. PROJECT DESCRIPTION 1.1. PROJECT LOCATION The proposed development is located east of Carlsbad Boulevard, and south of Juniper Avenue in the city of Carlsbad, County of San Diego, Califomia (see Attachment 1- Vicinity Map). A multi-dwelling unit called Pacific Condominiums is to be built on the site. 1.2. PROJECT SITE DESCRIPTION The subject site has an approximate area of 10,890 sf The site is also identified as Assessor's Parcel Number 204-251-01,204-251 -02 & 204-251 -03. It is surrounded by developed land, and streets. Elevations at the site ranges from approximately 48 feet above mean sea level on the west side ofthe property to approximately 44 above mean sea level on the eastem edge of the property. The site have relatively gentle slope from 3 to 4 percent. At present the site contains almost no vegetation since it has been recently cleared and grubbed, and is vacant. The proposed development will contain a combination of parking , landscaping, and multi- dwelling units. Infrastructure will include new storm drainage. 1.3. WATERSHED CONTRIBUTION Existing topography of the site shows that the stonnwater runoff drains toward eastem comer of the property. At pre developed stage (existing condition), the whole site (Area approximately 3.43 acres) will ultimately drain to the Agua Hedionda Creek Hydrologic Area Watershed (904.31). This area represents about 0.0245% of the entire Agua Hedionda Creek Hydrologic Area Watershed (14,000 acres).See also Attachment 5 - Hydrologic Unit Map/Drainage Basin for more details. The proposed project will not significantly alter the drainage pattem on the site. The surface water runoff discharge points will not divert from existing conditions. (See Attachment 6 - Hydrology Study) This project will not present any potential threat to erosion. The project has enough erosion confrol measures during the construction stage and post consfruction stage. Please see Attachments 9 & 10.;This project complies with part G3.1 of the County Stormwater Standards Manual in that there should be no increase in downstream erosion or velocities. 2. APPLICABLE LAWS, REGULATIONS, POLICIES, AND REQUIREMENTS 2.1. CLEAN WATER ACT In 1972, the Federal Water Pollution Act (also known as the Clean Water Act [CWA]) was amended to provide that the discharge of pollutants to waters of the United States from any source point is unlawfiil, unless the discharge is in compliance with a NPDES (National Pollutant Discharge Elimination system) permit. The 1987 amendments to the CWA added Section 402(p) (F.l.b.l) whish establishes a framework for regulating municipal and indusfrial storm water discharges under the NPDES program. 2.2. STATE LAWS AND REGULATIONS In California, the State Water Resources Confrol Board (SWRCB) administers the NPDES storm water-permitting program. The SWRCB has established a consfruction general permit that can be applied to most construction activities in the state. SWRCB have designated nine (9) Regional Water Quality Confrol Boards throughout the state. It is through these nine (9) regional confrol boards that the SWRCB enforces its regulations to most constmction. (See Attachment 2 - Califomia Regional Water Quality Confrol Boards). The City of Carslbad has prepared a Jurisdictional Urban Runoff Management Plan as described in Section F and H ofthe Municipal Storm Water Permit (NPDES Order No. 2001-01) issued by the San Diego Regional Water Quality Confrol Board on February 21, 2001. The City of Carlsbad will initiate implementation of the JURMP on February 21, 2002, and will use a continuous improvement and refmement sfrategy to identity changes to the JURMP through the life of the Permit. 2.3. STATE IMPAIRED WATERBODIES The state has compiled a list of impaired bodies of water, rivers and creeks. Some ofthese bodies of water are located in San Diego County. Please see Attachment 3 - The 303(d) List, for a complete list ofthese bodies of water and section 4 ofthis report. 3. POTENTIAL EFFECTS TO THE WATER QUALITY ENVIRONMENT 3.1. BENEFICIAL USES The beneficial uses for the hydrologic unit are included in Tables 1.1 and 1.2. These tables were exfracted from the Water Quaiity Confrol Plan for the San Diego Basin. The following are the meaning and descriptions of the acronyms used: MUN - Municipal and Domestic Supply: Includes uses of water for community, military, or individual water supply systems including, but not limited to, drinking water supply. AGR - Agricultural Supply: Includes uses of water for farming, horticulfrire, or ranching including, but not limited to, irrigation, stock watering, or support of vegetation for range of grazing. IND - Industrial Services Supply: Includes uses of water for indusfrial activities that do not depend primarily on water quality including, but not limited to, mining, cooling water supply, hydraulic conveyance, gravel washing, fire protection, or oil well re-pressurization. RECl - Contact Recreation: Includes uses of water for recreational activities involving body contact with water, where ingestion of water is reasonably possible. These uses include, but are not limited to swimming, wading, water-skiing, skin and SCUBA diving, surfing, white water activities, fishing, or use of natural hot springs. REC2 - Non-Contact Recreation: Includes the uses of water for recreational activities involving proximity to water, but not normally involving body contact with water, where ingestion of water is reasonably possible. These uses include, but not limited to picnicking, sunbathing, hiking, camping, boating, tide pool and marine life study, hunting, sightseeing, or aesthetic enjoyment in conjunction with the above activities. WARM - Warm Freshwater Habitat: Includes uses of water that support warm water ecosystems including, but not limited to, preservation or enhancement of aquatic habitats, vegetation, fish or wildlife, including invertebrates. WILD - Wildlife Habitat: Includes uses of water that support terrestrial ecosystems including, but not limited to, preservation and enhancement of terresfrial habitats, vegetation, wildlife, (e.g., mammals, birds, reptiles, amphibians, invertebrates), wildlife water and food sources. 3.2. INLAND SURFACE WATERS Under the Clean Water Act the state is required to specify appropriate water uses to be achieved and protected. The beneficial use designation of surface waters of the state must take into consideration the use and value of water for public water supplies, protection and propagation of fish, shellfish and wildlife, recreation in and on the water, agricultural, indusfrial and other purposes including navigation. Inland Surface waters have the following beneficial uses as shown on Table 1.1 Carlsbad Hydrologic Unit (904.00), Agua Hedionda Creek (904.31) TABLE 1.1 Beneficial Uses for Inland Surface Waters Hydrologic Unit M I R R W W A Number U N E E A 1 G N D C C R L R 1 2 M 0 904.4 3.3. GROUND WATER Under the Clean Water Act the state is required to specify appropriate water uses to be achieved and protected. Ground waters in the San Diego Region can have as many as six designated beneficial uses including: (1) municipal and domestic; (2) agricultural; (3) industrial service supply; (4) indusfrial process supply; (5) ground water recharge; and (6) freshwater replenishment. None ofthese beneficial uses will be impaired or diminished due to the construction and operation of this project. Carlsbad Hydrologic Unit (904.00), Agua Hedionda Creek (904.31) TABLE 1.2 Beneficial Uses for Ground Water Hydrologic Unit M A I Number U G N NRD 904.40 xxx * Excepted from Municipal o Potential Beneficial Use X Existing Beneficial Use - Not Applicable 4. CHARACTERIZATION OF PROJECT RUNOFF According to the California 1998 + 2002 303(d) List (Attachment 3 - The 303(d) List) published by the San Diego Regional Water Quality Confrol Board, there is an impaired water bodies that is associated with this project. • The project location and watersheds have been compared to the current published 303d list of impaired water bodies and the nearest impaired water bodies are Agua Hedionda Creek and the Pacific Ocean Shoreline, the segment area is between Carlsbad State Beach, and the South Carlsbad State Beach. • This project is approximately less than 1 mile upstream from the nearest listed water body. Construction pollutants and residuals from this project will be removed on-site. 4.1. STORMWATER QUALITY The site at its present condition has no record or report that will show the quality of storm runoff coming from the site. However, Attachment 4- Water Quality Standards Inventory Database for Agua Hedionda Creek gives the current condition on the overall drainage basin. During construction the following are some of the constituents commonly found that could affect water quality: • Sediment discharge due to grading/earthwork • Nufrients from fertilizer and pesticides associated with landscaping activities • Trash and debris from construction materials • Oil and similar products associated with equipment and power tools • Hydrocarbons from paved areas Attachment 8 - SSM Attachments G-1, Consfruction Pollutants, provides also information regarding pollutants that could affect water quality. For post-construction conditions, the following are some of the constituents that could affect water quality: • Nutrients from fertilizer and pesticides associated with landscaping activities • Trash and debris from general site use • Oils and similar products associated with automobiles • Hydrocarbons from paved areas All ofthese pollutants or residuals will be minimized and properly handled by applying BMP's. These measures are discussed more in detail in the following sections. 4.2. TRIBUTARY DRAINAGE AREA The site as described in the first part of this plan (see 1.2 Project Site Description) 4.3. SITE HYDROLOGY A Hydrology & Hydraulics Study (see Attachment 6 - Hydrology Study) is presented with this report. Please note that the pre & post development water surface runoff were determined in this study. The Pre-development flow rate taken from the drainage study is equal to 6.58 cfs. The Post-development flow rate taken from the smdy is equal to 10.602 cfs. Although there is a substantial increase on the runoff flow, these runoffs will directly flow to the existing storm drain system on the sfreet, thus this proposed project will not adversely impact the existing downsfream properties. 5. MITIGATION MEASURES (BMP's) TO PROTECT WATER QUALITY To address water quality for the project site, BMP's will be implemented during construction, interim development and post consfruction. A SWPPP worksheet (see Attachment 7 - SWPPP) is also included with this report. This worksheet gives a summary of information regarding the project and the list of BMP's that will be unplemented for the project. The level of effectiveness for the construction BMPs are described on each fact sheet. Usually it is presented at the side bar of the title sheet. This side bar presents information on which BMP objectives apply targeted constituents with indication of how much impact the BMPs will have on the pollutants and implementation requirements. Attachment 11 - Enhanced Treatment Confrol BMP Selection Matrix (U, L, M, H) will give effectiveness of each BMP. 5.1. CONSTRUCTION BMP's The following are the construction BMP's that will be used for this project: Check Dams (SC-4) Earth Dikes/Drainage Swales and Lined Ditches (SS-9) Gravel Bags/Sandbag Barrier (SC-8) Preservation of Existing Vegetation (SS-2) Hydroseeding (SS-4) Wind/Dust Erosion Confrol (WE-1) Stabilized Construction Roadway (TC-2) Street Sweeping and Vacuuming (SC-7) Paving and Grinding Operations (NS-3) Potable Water/Irrigation (NS- 7) Structure Construction and Painting (CA3) Silt Fence (SC-1) Stabilized Consfruction Enfrance (TC-1) Seeding and Planting • Material Delivery and Storage (WM-1) Material Use (WM-2) Oudet Protection/Velocity Dissipation Devices (SS-10) Spill Prevention and Confrol (WM-4) Solid Waste Management (WM-5) Concrete Waste Management (WM-8) Sanitary/Septic Waste Management (WM-9) Vehicle and Equipment Cleaning (NS-S) Vehicle and Equipment Fueling G^S-9) Vehicle and Equipment Maintenance (NS-lO) Storm Drain Inlet Protection (SC-10) All ofthese BMP's are shown in Attachment 9 - Construction BMP's, see Attachment 14 also. 5.2. INTERIM DEVELOPMENT BMP's The interim conditions may include graded building pads that may remain vacant for a period of time prior to parking areas or buildings being consfructed on the pads. The BMP's that will need to be implemented will be shown in detail at the time when consfruction documents are being prepared for the site. The perimeter ofthese graded pads should include measures such as gravel bags or silt fences until final site construction is completed. Many of the post construction BMP's listed below are to be implemented during this phase of development as well. 5.3. POST CONSTRUCTION BMP's The process of developing BMPs can include sfructural and nonstrucfriral practices. Usually, nonsttucmral and preventive BMPs can be more effective than structural measures. Types of post- construction BMPs are typically identified by the following categories: • Site design BMPs • Source confrol BMPs • Treatment confrol BMPs In many cases, an emphasis on natural BMPs is often desired for freatment controf See Attachment 10 & 15. a. Site Design BMPs Site design BMPs address aspects ofthe project design to reduce the impacts of stormwater runoff. Site design BMPs includes practices that are typically nonstructtiral in nature to reduce stormwater impacts offsite. Some ofthese site design BMPs and how they will be included are discussed below. Use Natural Drainase Courses The runoffs from westem part ofthe site will sheet flow to the landscape area on the frontage of the site. This scheme will not only avoid the concentration of flow but will also somehow fiher the runoff as it flows through the proposed landscaped area. b. Source Control BMPs Source confrol BMPs will focus on nonstructural BMPs. Storm Drain Signage Storm drain inlets and access points to natural drainage courses will be marked to discourage illegal dumping, with markings indicating the receiving water by name. Specifically: 1 All storm drain inlets and catch basins within the project area will have a tile or signage placed with prohibited language (such as: 'NO DUMPING - DRAINS TO PACIFIC OCEAN SHORELfNE") 2. Signs and prohibited language and /or graphical icons, which prohibit illegal dumping, must be posted at public access points along channels and creeks within the project area. 3. Legibility of tiles and signs must be maintained and tiles must be placed flush with the top of concrete to reduce fripping by pedesfrians. Thrash and debris from general site home use and other source will be prevented. Parking Area Sweeping Parking area sweeping scheduled at appropriate intervals (we recommend a minimum of bi- weeklv interval) can reduce pollutants that have built up over time and become deposited from vehicles, plants and other vegetations along sidewalks and islands. It is recommended that this BMP be implemented expeditiously once all the roads were developed. The following will be minimized: 1. Thrash and debris from general site home use, and from drivers & pedestrians 2. Oils and similar products associated with automobiles 3. Sediments and heavy metals Landscaping Landscaping ofthe slopes and other parts of the site will be incorporated into the plans. To expeditiously achieve plant establishment to reduce erosion, landscaping will consist of both native and non-native plants. The irrigation system will be closely monitored to reduce over irrigation and thus protect the manufactured slopes from being destabilized due to over watering and over saturation of the soil. Maintenance of vegetated or landscaped areas (sfreet sidewalks, sfreet landscaped islands or slopes) and other planted areas should be the responsibility of the owner or corporation handling the property. This owner will develop a schedule and fijnding scheme when the project is tumed over by the confractor/developer to them. c. Treatment Control BMPs Treatment confrol BMPs typically includes sfructural devices that remove or reduce pollutants in runoff. Attachment 11 - Enhanced Treatment Control BMP Selection Mafrix shows pollutants of concem degree of efficiency capability (U, L, M .H) of each treatment confrol BMP categories. These BMPs are either volume-based or flow-based . The flow based criteria is applicable for both filtration devices and biofilter treatment confrol BMPS, while the volume based criteria is applicable for the extended detention basin. The sizing ofthe Post Construction Strucmral Treatment BMP's will comply with the volume/flow criteria per the Califomia Regional Water Quality Control Board; San Diego Region Order WQ 2001-15 adopted November 15, 2001. As required by the RWQCB and the County of San Diego, the project, depending on the type of BMP, will use one or both of the following numeric sizing criteria: • Volume based BMP's shall be designed to mitigate the volume of runoff from a 0.6" storm event. • Flow based BMP's shall be designed to mitigate the maximum flow rate of runoff produced from a rainfall intensity of 0.2" of rainfall per hour. Using Biofllters There are four grass lined biofilter swales located at points that will intercept and freat stormwater runoff Additionally there is also located in the northeastern parking lot ofthe site a biofilter within the proposed landscaped island. Using Filtration Units All onsite flows will be freated to meet the new storm water requirements by equipping all inlets with prefabricated treatment inlets or filter type inserts. It is recommended that any ofthe filter type mserts or filfration devices (or their equivalent) shovm on Attachment 12 - Filfration Devices be used on the site. These units will remove sediments as well as treat the storm water by removing an acceptable level ofthe Total Suspended Solids (TSS) and the Total Pefroleum Hydrocarbons (TPH) from untreated runoff. The system will be a flow based BMP and will be designed to mitigate the first flush flow. This first flush flow is described more explicitly above. Also these devices are designed to handle storm flows, which are greater than the 85"" percentile, to enter the storm drain system without causing flooding. Please see Attachment 11 (U, L, M,H) for the poilutant that can be removed by this BMP. 6.0 MAINTENANCE Maintenance will be under the guidelines as shown in the "STORMWATER MAINTENANCE PLAN" by the County of San Diego DPW Land Development Guidelines. The owners of the proposed development will eventually be responsible for the maintenance and inspection ofthe Post-Construction BMP's. Stormwater sampling and monitoring will be the responsibility of the owners. They will also be responsible to determine the sources and locations of pollution if discovered during sampling and monitoring. The owners will need to be assessed an annual maintenance and inspection/monitoring fee for the upkeep of any Post Construction BMP's. Maintenance for both the construction and post construction BMP's are addressed on the description of each BMP under Attachments 9 & 10. For landscaping maintenance, the owner will monitor the compliance and maintenance of all vegetated areas as an efficient post construction BMPs. See also, Landscaping under Source Control BMP for more details. Attachment 13- Schedule & Costs of Maintenance for the Post-Construction BMP's, is presented as a sample or guide only. It is the responsibility of the owner to device its own schedule & costs for the maintenance of these BMP's. 7.0 REFERENCES REVISIONS TO CONSTRUCTION STORMWATER GUIDANCE: DATED October 2, 2001 by - Department of Public Works, County of San Diego CALIFORNIA STORM WATER BEST MANAGEMENT PRACTICE HANDBOOKS: DTD: March, 1993 By - Camp Dresser and McKee Larry Walker Associates Uribe and Associates Resources Planning Associates For Stonnwater Quality Task Force SAN DIEGO HYDROLOGY MANUAL by - Department of Public Works, County of San Diego DESIGN - DATA HANDBOOK FOR CIVIL ENGINEERS, VOL 1 by - Elwynn E. Seelye WATER QUALITY CONTROL PLAN, SAN DIEGO BASIN - REGION 9 by Califomia Regional Water Quality Confrol Board, San Diego Region. September 8, 1994. CALTRANS STORM WATER QUALITY HANDBOOKS - CONSTRUCTION SITE BEST MANAGEMENT PRACTICES MANUAL by Cahrans, November 2000. ATTACHMENT 1 - VICINITY MAP StreetsGS Copyright © 1988-1997, MiCTOSoft Corporation and/or its suppliers. All rights reserved. Please visit our web site at http://maps.expedia.com. Page 1 ATTACHMENT 2 - CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD I STATE WATER RESOURCES CONTROL BOARD P. O. Box 100, Sacramento, CA 95812-0100 LegisJative and Public A.fairs: {915)657-2390 Clean Watar Programs Information: (91S) 739-4400 Water Quality Information: (916) 657-0687 Water Rights Information: (916) 657-2170 CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARDS NORTH COAST REGION (1) 5550 Skylsine BVd. Suits A Santa Rosa, CA 954C3 (707) 575-2220 SAN FRANCISCO BAY REGION (2) 2101 Webster Street. Ste. 500 Oakland, CAS4S12 (510) 464-1255 CENTRAL COAST REGION (3) 81 Higuera St., Suite 200 San Luis Obisoo, CA 93401-5414 (805) 549-3147 LOS ANGELES REGION (4) 101 Centre Plaza Drive Monterey Park, CA 91754-2156 (213) 266-7500 CENTRAL VALLEY REGION (5) 3443 Routier Road, Suite A Sacramento. CA 95827-3098 (916) 361-5600 Fresno Branch Office 3614 East Ashlan Ave. Fresno, CA 93726 (209) 445-5116 Redding Branch Office 415 Knollcrest Drive Reddinc, CA 96002 (916) 224-4845 LAHONTAN REGION (S) 2092 Lake Tahce Bouleva.^d, Suite 2 South Lal'^e Tahoe, CA 95150 (916) 544-3481 Victorville Branch Office Civic Plaza, 15428 Civic Drive, Suite 100 Victop/ille, CA 92392-2359 (619) 241-6533 COLORADO RIVER BASIN REGION (7) 73-720 Fred Waring Drive, Suite 100 Palm Desert, CA 92260 (619) 346-7491 SANTA ANA REGION (8) 2010 Iowa Avenue, Suite 100 Riverside, CA 92507-2409 (714) 732-4130 SAN DIEGO REGION (9) 9771 Ciairemont Mesa Blvd. Ste. 8 San Diego, CA 92124 (519) 467-2952 STATE Or CAUFORNIA Ps;8 Wlson.Gover.-e.' i=5NU E.NV1R0NMENTAI PROTECTION AGENCY Ja.Ties M. Strock, Sec.-eUL-/ ATTACHMENT 3 - THE 303d LIST Figure 3: 1998 + 2002 303(d) Waters •iin Joaqiiim Hills HS.A l..n.-jiinc=iOeri.:!-i I r.-.". Ali-3C|HSA ['jai\a ('cunt I ISA (jan.^ P'Oint I it"!! tor Mil juMii i.,u^'jl- iiii';'i,illij Lxwor San Jufin HSA San Oifego i?ay Ti.lflanUi f'sil- 0 Sli.-iil Shellei I'MdiiU Valcli Dasi J;IHfll»-l l'..l-illli oIlDffjlKiti f'-jfK Kfllog 31 Be^i.-li ;:'nil St I |.4V.il SUiiori M..air C..'ioft:-!£lu bii.i.H' Meat <: itolk^;. Cieet: near SwiUer Cteek p St anri Bio^flway Piers ttiiilh lil }4lii ::il M <{ine T eriilitiMl /III Si CliaiHiel Meal Grape :":t . CliuUViilaMani,.. ^C^^H-'iiin;;.!) /A^Rivor ^^^Coastline •i Bay mill Lake I I County Line N W California Regional Water Quaiity Control Board, San Diego Region 48 Figure 1: 1998 303(d) Waters Coastline /V/Rivo. Bll Estuary Bay Lake County Line N Mjudna HiJ T iii.nn.i IVivfti (• :)tu.iir California Regional Water Quality Control Board, San Diego Region 46 W E Table 4 - Combined 1998* and Draft 2002 Section 303(d) Update Hydrologic Descriptor Waterbody Segment / Area ^ Pollutant / Stressor Extent of Imoairment ^ Year Listed 21 Loma Alta HA (904.10) Pacific Ocean Shoreline at Loma Alta Creek Mouth Bacterial Indicators^ 1 mile 1998 22 Loma Alta HA (904.10) Loma Alta Slough Bacterial Indicators^ Eutrophic 8 acres 1998 23 Buena Vista Creek at Buena Vista Creek HA (904.20) Pacific Ocean Shoreline Carlsbad City Beach at Carlsbad Village Drive Carlsbad State Beach at Pine Avenue -— Bacterial Indicators^ 0.65 miles 1998 24 El Salto HSA (904.21) Buena Vista Lagoon Bacterial Indicators^ Sedimentation / Siltation 350 acres 350 acres Nutrients 150 acres 1998 1998 1998" 25 Los Monos HSA 1 (904.31) Agua Hedionda Lagoon Bacterial Indicators^ Sedimentation / Siltation 5 acres 1998 1 26 Los Monos HSA lower portion Diazinon lower 2 miles 2002 1 (904.31) Agua Hedionda Creek Totai Dissolved Solids lower 8 miles 2002 1 27 San Marcos HA 1 (904.50) Pacific Ocean Shoreline at Moonlight State Beach Bacterial Indicators^ 0.4 miles 1998 28 Escondido Creek 1 HA (904.60) Pacific Ocean Shoreline at San Elijo Lagoon at Solana Beach Bactenal Indicators^ 0.8 miles 1998 29 San Elijo HSA (904.61) San Elijo Lagoon Bacterial Indicators^ 150 acres 1998 Eutrophic 330 acres Sedimentation / 150 acres Siltation 150 acres 30 San Dieguito HU 1 (905.00) Pacific Ocean Shoreline at San Dieguito Lagoon Mouth Torrey Pines State Beach at Del Mar (Anderson Canyon) Bacterial Indicators^ 0.8 miles 1998 31 Del Dios HSA 1 (905.21) Green Valley Creek Sulfate 1 mile 2002 1 32 Del Dies HSA (905.21) Hodges Reservoir Entire Reservoir Color Nitrogen Phosphorus Total Dissolved Solids Entire Reservoir 2002 33 Felicita HSA 1 (905.23) Felicita Creek Total Dissolved Solids lower 2 miles 2002 ' 34 Felicita HSA (905.23) Kit Carson Creek Total Dissolved Solids 1 mile 2002 1 35 Highland HSA 1 (905.31) Cloverdale Creek Phosphorus Total Dissolved 1 mile 2002 1 35 Highland HSA 1 (905.31) Solids 136 Sutherland HSA 1 (905.53) Sutherland Reservoir Entire Reservoir Color Entire Reservoir 2002 last updated 4/12/02 S;WVQS\3a3dlist\SD Staff Report-2002\2002 draft 303d list\ http://vmTOSwr(»ca,gov/-rwqcb9/ProgramsrrMDLn03d/Table_4_-_Combined_1998_and_200SLy^^ IO?§r: Table 4 - Combined 1998* and Draft 2002 Section 303(d) Update Hydrologic Descriptor Waterbody Segment / Area ^ Pollutant / Stressor Extent of Impairment Year Listed 37 Miramar Reservoir HA (906.10) Los Penasquitos Lagoon Entire Lagoon Sedimentation / Siltation 385 acres 1998 38 Miramar Reservoir HA (906.10) Pacific Ocean Shoreline Torrey Pines State Beach at Los Penasquitos Lagoon outlet Bacterial Indicators^ 0.4 miles 2002 39 Scripps HA (906.30) Pacific Ocean Shoreline La Jolla Shores Beach at Ei Paseo La Jolia Shores Beach at Caminito Dei Oro Bacterial Indicators^ 3.1 miles 1998 La Jolia Shores Beach at Vaiiecitos La Jolla Shores Beach at Ave de ia Playa at Casa Beach, Children's Pool South Casa Beach at Coast Blvd. Whispering Sands Beach at Ravina St. Windansea Beach at Vista de la Playa Windansea Beach at Bonair St. Windansea Beach at Playa del Norte Windansea Beach at Palomar Ave. at Tourmaline Surf Park Pacific Beach at Grand Ave. 40 Miramar HA (906.40) Famosa Slough & Channel Eutrophic 28 acres 1998 41 Miramar HA (906.40) Mission Bay Shoreline along the entire bay Bacterial indicators^ 1540 acres 1998 Rose and Tecolote Creek Mouths" Eutrophic 0.5 acre 1998 Rose and Tecolote Creek Mouths" Lead 0.5 acre 1998 42 Tecolote HA (906.50) Tecolote Creek Bacterial indicators^ Cadmium Copper Lead Toxicity Zinc 6 miles 1998 43 San Diego HU (907.11) Pacific Ocean Shoreline at San Diego River Mouth (aka Dog Beach) Ocean Beach at Bermuda Ave. Bacterial Indicators^ 0.9 miles 1998 2002 44 Santee HSA (907.12) Forrester Creek Fecal Coliform Total Dissolved Solids lower 1 mile upper 3 miles lower 1 mile 2002 2002 2002 45 Mission San Diego HSA (907.11) & San Diego River, Lower Santee HSA (907.12) Fecal Coliform Oxygen (dissolved) Phosphorus Total Dissolved Solids lower 6 miles lower 20 miles 2002 2002 last updated 4/12/02 S.WVQS\303dlist\S0 Staff Repo(t-2002\2002 draft 303d list\ OQ http://wvvw.5wrctj.ca. gov/-rwqcb9/Programs/TM0IJ303d/Ta6le_4_-_Combined_1998_and_20021Bratt_Se^ Table 4 - Combined 1998 and Draft 2002 Section 303(d) Update Hydrologic » w j „ B ' . f Waterbody c««.„««* / A—B Descriptor ' Segment / Area Pollutant / Stressor Extent of Impairment ^ Year Listed 46 Chollas HSA (908.22) Chollas Creek Bacterial Indicators^ 1 mile 1998 Cadmium Copper Lead Toxicity Zinc 47 Pueblo San Diego HU 908.00, Sweetwater HU 909.00 and Coronado HU (910.00) San Diego Bay Shoreline Point Loma HA (908.10) near Sub Base Degraded Benthic Comm. 16 acres in Shelter Island Yacht Basin Sediment Toxicity Copper (dissolved) 50 acres at Kellogg Street _ _ at Shelter Island Shoreline Park San Diego Bay Shoreline Lindbergh HSA (908.21) vicinity of B Street and Broadway Piers •' near Grape St. at G Street at B Street Pier' Bacterial Indicators^ Degraded Benthic Comm. Sediment Toxicity Degraded Benthic Comm. Sediment Toxicity 0.4 miles 0.4 miles 10 acres 7 acres San Diego Bay Shoreline Chollas HSA (908.22) near Coronado Bridge near Chollas Creek San Diego Bay Shoreline El Toyan HSA (908.31) near Switzer Creek at 32nd St. Naval Station San Diego Bay Shoreline Paradise HSA (908.32) San Diego Bay Shoreline Telegraph HSA_(909.11) San Diego Bay Shoreline Coronado HA (910.10) at 7th St. Channel at 24th St. Marine Terminal at Chula Vista Marina at Tidelands Park Bacterial Indicators^ Degraded Benthic Comm. Sediment Toxicity Degraded Benthic Comm. Sediment Toxicity Degraded Benthic Comm. Sediment Toxicjty Degraded Benthic Comm. Sediment Toxicity Degraded Benthic Comm. Sediment Toxicity Degraded Benthic Comm. Sediment Toxicity Bacterial Jndicatqrs^ Bacterial Indicators^ 0.4 miles 0.4 miles 30 acres 14 acres See Footnote K 76 acres 9 acres 10 acres 0.4 miles 0.4 miles 1998 1998 '2002" 2002 1998 1998 1998 199£ 1998 1998 2002 1998 1998 1998 1998 2002 48 Tijuana HU ( 914t.0^ed 4/12/02 8 iiiiirainai<iiiiiia i Pacific Ocean Shoreline I anaaiiiiiina i MAM from the border, extending north along the shore Bacterial Indicators^ 3.2 miles 1998 http //wvw.swrcCi ca.gov/-rwqcb9/Programs/TMDL/303d/TaBle_4_-_Combined_1998_and_20Ci7.Braft_Sectiori_303_d Update. xlsVTable 4 Table 4 - Combined 1998* and Draft 2002 Section 303(d) Update Hydrologic » u J R ' . f Waterbody c««™,—tiA — B Descnptor ' Segment / Area' Pollutant / Stressor Extent of Year Impairment ^ Listed •* San Joaquin Hilis HSA (901.11) & Laguna Beach HSA (901.12)° Pacific Ocean Shoreline Cameo Cove at Irvine Cove Dr, Riviera Way Bacterial 2.4 miles 1998 at Heisier Park - North Indicators at Main Laguna Beach Laguna Beach at Ocean Avenu^ Laguna Beach at Laguna Avenue Laguna Beach at Cleo Street Arch Cove at Bluebird Canyon Road Laguna Beach at Dumond Drive 2 Aliso HSA (901.13) Aliso Creek Bacterial Indicators^ lower 1 mile 1998 Enterococci, £ See Footnote F coli, Fecal Coliform, Phosphorus, Toxicity See Footnote F 2002 3 Aliso HSA (901.13) Pacific Ocean Shoreline Laguna Beach at Lagunita Place / Blue Lagoon Place at Aliso Beach Bacterial Indicators^ 0.7 miles 1998 4 Aliso HSA (901.13) Aliso Creek at creek mouth Bacterial Indicators^ 0.3 acres 1998 5 Dana Point HSA (901.14) Pacific Ocean Shoreline Aliso Beach at West Street Aliso Beach at Table Rock Drive 1000 Steps Beach at Pacific Bacterial Indicators^ 1.88 miles 1998 Coast Hwy at Hospital (9th Ave) at Salt Creek (large outlet)^ Salt Creek Beach at Salt Creek service road Salt Creek Beach^T'Daha Strand Road 6 Dana Point HSA (901.14) Dana Point Harbor Entire Harbor at Baby Beach Dissolved Copper BacterTaT indicators^ Entire Harbor 2002 0.4 miles 2002 7 Mission Viejo HA (901.20) San Juan Creek at creek mouth Bacterial Indicators^ 2 acres 1998 8 Lower San Juan HSA (901.27) San Juan Creek Bacterial Indicators^ Bactenal Indicators^ 1 mile 1998 9 Lower San Juan HSA (901.27) Pacific Ocean Shoreline at North Beach Creek at San Juan Creek (Targe outlet) at Capistrano Beach South Capistrano Beach at Beach Road 1.5 miles 1998 2002 last updated 4/12/02 S:\WQS\303dlist\SD Staff Report-2002\2002 draft 303d list\ hltp://www.swrcO.ca.gov/-rwqcb9/Programs/TMOL/303d/Table_4_ 00?§r Combined_1998_and_200S^"eraft_Section_303_d_Update.xls\Table4 Table 4 - Combined 1998* and Draft 2002 Section 303(d) Update 10 San Clemente HA at Kocne beach (large outiet) „ , . , 1 Bactsrial (901.30), San Pacific Ocean Shoreline Oie Hanson Beach Club Beach at ^ Mateo Canyon HA Pico Drain Indicators (901.40) & San San Clemente City Beach~at~Ei Onofre HA Portal St. Stairs (901.50) ° San Clemente City Beach at Mariposa St. San Clemente City Beach ¥t Linda Lane San Clemente City Beach at South Linda Lane San Clemente City Beach at Lifeguard Headquarters Under San Clemente MurTicipal Pier San Clemente City Beach at Trafalgar Canyon (Trafalgar Ln.) San Clemente State Beach at Riviera Beach San Clemente State Beach at Cypress Shores San OhoTre State Beach at "San Mateo Creek outlet '' H^r/om'^??Pnma Deshecha Creek lower portion Phosphorus, HSA (901.31) ^ Turbidity 12 Segunda Deshecha HSA Segunda Deshecha Creek lower portion Phosphorus, (901.32) Turbidity 13 Lower Ysidora ^ . . . HSA (902.11) Marganta Lagoon Eutrophic f'^fJ"^ Rainbow Creek (902-20) Phosphorus 15 Gavilan HSA Santa Margarita River, (902.22) Upper upper portion Phosphorus 16 Gavilan HSA ^ ^ , . . , ., Total Dissolved tannoo\ Sandia Creek lower 1.5 miles i oiai uissoivec (902.22) Solids 17 Wolf HSA T ~~~ ! " (9Q2 Murneta Creek Phosphorus 18 San Luis Rey HU „ , ^ Bacterial /am nn\ Pacific Ocean Shoreline at San Luis Rey River Mouth = 1 Indicators^ 19 Mission HSA ~ ~ . ~~ (903 11) Lake Guajome Eutrophic 20 Mission HSA ~ Chloride (903.11) San Luis Rey River lower portion Total Dissolved Solids Extent of Year Impairment Listed 3.4 miles 1998 2002 lower 1 mile 2002 lower 1 mile 2002 1 acres 1998 5 miles 1998 17.5 miles 2002 lower 1.5 mile 2002 1.8 miles 2002 0.4 miles 1998 25 acres 1998 lower 13 miles 2002 lower 17 miles 2002 last updatad 4/12/02 S VWQS\303dlist\SO Staff Report-2002V2002 draft 303d list\ _y http //www swrcb.ca.gov/-n«qcb9/Programs/TMOL/303d/Table_4_-_ComBined_1998_and_200^0raft_Section_303_d Update xlsVTable 4 Tabie 4 - Combined 1998 and Draft 2002 Section 303(d) Update Hydrologic * i. j „ , . B _ . f Waterbody c«„^„„» # A — B Descriptor ' Segment/Area Pollutant / Stressor Extent of Impairment' Year Listed 49 Tijuana HU (911.00) Pine Valley Creek, Upper lower portion Enterococci lower 2 miles 2002 50 San Ysidora HSA (911.11) Tijuana River Bacterial Indicators^ 7 miles 1998 Dissolved Oxygen, low Eutrophic Pesticides Solids Synthetic Organics Trace Elements Trash 51 San Ysidora HSA (911.11) Tijuana River Estuary Bacterial Indicators^ Eutrophic Lead Nickel Pesticides Thallium Trash Oxygen (dissolved) 150 acres 1 acre 1998 1998 Entire Estuary 2002 The 1998 List has been corrected as described in the text, pgs 17-18. ^ The 1998 list, as adopted by the Regional Board, contained specific locations of impairment. These specific locations were omitted from the list as adopted by the USEPA. In 2002, it is recommended that these specific locations be included to better illustrate the location of impairment. In 1998, unless more information was available, the extent of impairment was assumed to be 0.1 miles for each shoreline impairment due to bacteria. The extents of impairment have been increased to 0.4 miles. Extents of impairment that were greater than 0.4 miles in 1998 were not changed. Rationale is described in Appendix B, pgs B69-B74. ° This location was previously listed as "Pacific Ocean, Laguna Beach HSA" ^ In 1998, Bacterial Indicators implies that impairment was due to either total coliform, fecal coliform, or both. In 2002, impairment may have also been caused by enterococci. The entire reach (7.2 miles) is listed for enterococci, E. coli, fecal coliform and toxicity. Additionally, Aliso Hills Channel, English Canyon Creek, Dairy Fork Creek, Sulphur Creek and Wood Canyon Creek are also listed for enterococci and £. coli. The lower 4 miles of Aliso Creek is listed for phosphorus. ° This location was previously listed as "Pacific Ocean, San Clemente HA." " These locations and extents of impairment are approximated from interpretation of the 1996 Section 303(d) Report. This location was previously known as "San Diego Bay, at Downtown Piers." Area at the end of Switzer Creek, bound by piers on the north and south side of the outlet, extending to the edge of the piers. last updated 4/12/02 S:\WQS\303dlist\SD Staff Report-2002\2002 draft 303d list\ , A http://www swrcb ca.gov/-n*qcb9/Programs/TMDlJ303d/Table_4_-_Combined_1998_and_20fl?.ISraft_Section_303_d Update.xls\TaBle 4 ATTACHMENT 4 - WATER QUALITY STANDARDS INVENTORY DATABASE Water Quality Standards Inventory Database Water Quality Standards Inventory Database Page 1 of 8 Click on the links below to search for another waterbody. Search hv Beneficial Uses •Seurch hv Keyword SearclLhjAWRCBJ?e^O!! Seaich hv Caliran.s District Search hv Countv Click on the links below to view water quality parameters for Aqua Hedionda Lagoon. V\.:iliT(^i.il!i\ Ohjct-i^-^-v \V'a(ei (.)n.ili'v N injiuc C'on^iliuoiii> Qn.iliiv NMnuTic (.'rik-iia W alC!- l^uaiii;. H itlci la ( 'nloria Click on the links below to view comments and corrections logged or to navigate to the conmients and corrections input page. C oniiiicnls and ( (MTeclii}ii> l.ojjijeLi Cominents and Coirections Input Page Aqua Hedionda Lagoon Water Quality Control Board Region: Click on the region number for a list of waterbodies and reported hydrologic units in that region. 9 Hydrologic Units: Click on the reported hydrologic unit for a list of waterbodies in that unit. Reported Hydrologic Units Published Hydrologic Units Hydrologic Units: Click on the reported hydrologic unit for a list of waterbodies in that unit. 904,31 904.31 Caltrans District: Click on the Caltrans district for a list of waterbodies and reported hydrologic units in that district. H Counties: Click on the reported county name for a list of waterbodies and reported hydrologic units in that county. I'li'.iv.; i'.rlc .IIK! pnl^!r,hr>l c:Mir,l:(.'- .tic Li'.^>>r!:!lcd vvilil liuh'olngif uilil. nol •^alerbnd: Reported Counties Published Counties SAN DIEGO SAN DIEGO Location Map Watershed Map F' Waterbody Beneficial Uses RWQCB Beneficiiil Use Click on the beneficial use for the beneficial use code and description. Use Status Potential or Existing .Aquaculture E.xisting Cold Freshvvater Habitat Existing C(>mmei"cial and Sport Fi.shing E.xisting Estuarine Habitat Existing Industrial Service Supply Existing Marine Habitat Existing http://endeavor.des.ucdavis.edu/wqsid/waterbody.asp ?wb_fkey=3701 9/23/03 Water Quality Standards Inventory Database Page 2 of 8 Migration of Aquatic Organisms lExisting J Rare, Threatened or Endangered Species jExisting Water Contact Recreation [Existing •'^.t^n^Cj'intac^t Wate [Existing Shellfish Harvesting [Existing Wildlife Habitat •Existing VVaterbody Reach IRenencial Use Water Quality Objectives Constituent Constituent Concentration Constituent Units Constituent Details Constituent Comments *i\o WQQs Available Water Quality Narrative Constituents Constituent Name Constituent Description Biostimulatory Substances Inland surtace waters, bays and estuaries and cciastal lagoon waters shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cau.se nuisance or adversely afTeci beneficial uses. Color Waters shall be free of coloration that causes nuisance or adversely affects beneficial uses.The natural color of fish, shellfish or other resources in inland surface waters, coastal lagoon or bay and estuary shall not bc impaired. DO The dissi^lved <^xygen concentration in ocean waters shall not at any time be depressed more than 10 percent trom that which occurs naturally, as the result ofthe discharge of oxygen demanding waste materials. Floating Material ^Vaters shall not contain floating material, inckiding solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses. Oil and Grease Waters shall nol contain oils, greases, waxes, or other materials in concentrations which result in a visible film OI- coating on the surface of the water or on objects in the water, or which cause nuisance or whicli otherwise adversely affecl beneficial uses. pll The pM value shall not be changed at any lime more than 0.2 pH units froin that which occurs naturall_\'.Changes in normal ambient pl l levels shall not exceed 0.2 units in waters with designated marine (M,\R). or estuarine (EST), or saline (S.AL) beneficial u.ses. Changes in nonnal ambient pH levels shall n(M exceed n..s units in fresh waters with designated cold freshwater habitat (COLD) or •varm freshwaier habitat (W.ARMi beneficial uses. In bays and estuaries the pH shall not be depressed helow 7.0 nor raised above 9.0, In inland surface waters the pH shall not be depressed below 6.5 nor raised abovc 8..-^. Radioed ivii\' Radioiiiichdes shall not he preseni in concentiaiions that are deleterious to human, plant, animal, or .K|tiaiic life noi- iliai resiili in ihe accun-iulaiion of radionuclides in the food web to an extent that prcsenis a ha/ai-(l lo !iiii-iian. planl. ani|-i-ial or acjiialic life. .Sctlimcni 1 he suspended .scdnneni load and susf-iended setlimeni di.scharge rate of surl'ace waters shall no\ be alicied in such a n-ianncr as t(i cause nuisance or adversely affecl beneficial uses. Siispciulod .Sohds Waici s sh.ill niM contain siispen(.led and settlable solids in concentrations of solids that cause nuisance iradverscK affecl beneficial uses. Tovicil} Ml waters shall be mamiained free of toxic stihstances in concentrations that are toxic to, or that produce deirlmci-iial phvsiologiciil responses ii-i human, plant, aniinal. or aquatic life. Compliance with litis (-ibjecioe v\ ill he determined by tise of indicator organisms, analyses of species diversity, population densiiN. grow th anomalies, bioassays of appropriate duration, or othet- appropriate methods IS specified by thc Regional Board. The survival of aquatic life in surface waters subjected to a waste discharge or othci- contmllabie wtiter quality factr>rs. shall not be iess than that for the same water body n ateas unaffected h\ the \\ aste di.scharge or. when necessary, tbr other control water that is consistent w ith ret|iiirements specified in L'S EP.A. State Water Resources Control Board. As a minimum, cornpliance with this objective as stated in the previous sentence shall be evaluated with a 96-hour icute bioassay. In addition, eftluent limits based upon acute bioassays of effluents will be prescribed w here ap(-)ropriate. iiddiiional nun-ierical receiving vvater objectives for specific toxicants will be http://endeavor.des.ucdavis.edu/wqsid/waterbody.asp ?wb_fkey=3701 9/23/03 Water Quality Standards Inventory Database Page 3 of S established as sufficient data become available, and source control of toxic substances will be encouraged. Temperature The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction ofthe Regional Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased n-iore than 5F above the natural receiving water temperature. Taste and Odor W'aters shall not contain taste or od<'>r producing substances at concentrations which cause a nuisance or adversely affect beneficial uses. The natural taste and odor of fish, shellfish or other Regional water resouices used for hun-ian consumpti(-in Shall not be impaired in inland surface waters and bays and estuaries. Turbidity Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. Water Quality Numeric Criteria Beneficial Use Numeric Constituent Name Numeric Constituent Detail Numeric Constituent Maximum Numeric Constituent Units Numeric Constituent Comments Numeric Constituent Reference MAR .^'Iercul-y Background sea water concentration 0.0000005 mg/L Ocean Plan MAR Meicury Daily Vlaximum 0.00016 mg/L Ocean Plan MAR Mercury instantaneous .Maximum 0.0004 mg/L Ocean Plan MAR Nickel 6 Month Median 0.005 mg/L Ocean Plan MAR Nickel Daily Maximum 0.02 mg/L Ocean Plan MAR Nickel InstantaneiHis Vlaximum 0.05 mg/L Ocean Plan MAR Nitrobenzene ,iO-day Average 0.0049 mg/L Ocean Plan MAR N-nilrosiKlitnethylamine .lO-day Average O.OOI? mg/L Ocean Plan MAR N-nitr(-isodipheny lamine .lO-day .Average 0.0025 mg/L Ocean Plan MAR PA l is }0-±\y .Average 0.000008S mg/L Ocean Plan M.AR PCBs lO-day Average 0.000000019 in g/L Ocean Plan MAR Phenolic Compounds (non- chlorinated) 6 Month Median 0.0? mg/L Ocean Plan MAR Phenolic Com|"'iHIIKIS (tion- chl(>i-ii-iated) nail> .Vlaximum 0.12 mg/L Ocean Plan .MAR Phenolic ('onipotini,L^ (nnn- chloiinated i Instantaneous Ma\in-iuni mg/L Ocean Plan MAR Silver fl Month Vicdian 0.007 mg/L Ocean Plan MAR Silver Background sea wafer concentration 0.000 1 6 mg/L Ocean Plan MAR Siber Daily Vlaximu m 0.0028 mg/L Ocean Plan .MAR Silver instantaneous M axi mum 0.0007 mg/L Ocean Plan MAR 'fCDD equivalents .>0-day Average 0.0000000000039 mg/L Ocean Plan http://endeavor.des.ucda vis.edu/wqsid/waterbody.asp?wb_fkey=3701 9/23/03 Water Quality Standards Inventory Database Page 4 of 8 MAR Tetrachloroethylene 30-day Average 0.099 mg/L Ocean Plan MAR Thallium 30-day .Average 0.014 mg/L Ocean Plan MAR Toluene 30-day Average 85 mg/L Ocean Plan MAR Total Chlorine Residual 6 Miinth Median 0.002 mg/L Ocean Plan MAR Total Chlorine Residual Daily .Vlaximum 0.008 mg/L Ocean Plan .MAR Total Chli-iiine Residual Instantaneous VIaxi mum 0.06 mg/L Ocean Plan MAR 'foxaphene 30-day Average 0.0000002 1 mg/L Ocean Plan MAR Tributyltin 30-day Average 0.0000014 mg/L Ocean Plan .MAR 'f rich loroelhy lene 30-day Average 0.027 mg/L Ocean Plan MAR Vinyl Chl(-)i-ide 30-d;iy Average 0.036 mg/I^ Ocean Plan MAR Zinc 6 Vionth VIedian 0.02 mg/L Ocean Plan iMAR Zinc Background sea water concentratii-in 0.008 mg/L Ocean Plan MAR Zinc Daily Vlaximum 0.08 mg/L Ocean Plan MAR Zinc Instantaneous Vlaximtim 0.2 mg/L Ocean Plan MAR I.I.I -Trichlori^elhane 30-day .Average 540 mg/L Ocean Plan MAR 1.1.2,2-Tetrachloroethane 30-day .Average 1.2 mg/L Ocean Plan MAR 1.1.2-Trichloroethane 30-day Average 43 mg/L Ocean Plan MAR 1. i -f)ichloroeihylcne 30-day .Vveiaize 7.1 n-ig/L Ocean Plan MAR 1.2-f)ichloroethanc 30-day .Vveragc 0. 1 3 mg/L, Ocean Plan MAR 1.2-l)i|ihenvlh\'dra/.inc 30-diiy Average 0.00016 mg/L Ocean Plan MAR 1 ..•^-nichli-iropropenc 30-day A verage 0.0089 n-ig/L, Ocean Plan MAR 1 .-t-nichlorohcn/.cnc .>0-day \\ era Lie 0.018 mg/L. Ocean Plan MAR 2.4.Ci-T!-ichlori iphcni >l '0-day \verage 0.00029 mg/L Ocean Plan MAR 2.-i-niniii-ophcno! 30-da_\ ,\\ erage 0.00-i mg/L Ocean Plan ,M,AR 2.44)initi-ololiicne 30-day .Average 0.0026 mg/L Ocean Plan MAR .\,'^-l ''ich lon^benzidine ,>0-day .\verage 0.000008 1 mg/L Ocean Plan MAR -l-.6-ryinitn>-2-Metlnlphenol 3()-daY .Av erage 0.22 mg/L Ocean Plan MAR .Acrolein 30-day Average 0.22 mg/L Ocean Plan http://endeavor.des.ucdavis.edLi/wqsid/waterbody.asp?wb_fkey=3701 9/23/03 Water Quality Standards Inventory Database MAR MAR .MAR VIA R MAR VL\R MAR MAR MAR VIA R MAR .VIA R .VIA R MAR VIA R MAR .VIA R VIA R VIA R .Acrylonitrile lO-day [.Average 0.0001 |mg/L Aldrin 30-day I.Ave rage 0.000000022 I mg/L I.A nti mon V |30-day .Average I mg/L IA rsenic |6 Month jVledian O.OOS Img/L I Arsenic Background |0.003 Isea water lc(-incentratiiin Img/L Arsenic Daily IMaximum 0.032 I mg/L Arsenic llnstantaneous jO.OS jVIaximnm I mg/L [Benzene 30-day .Average 0.0059 [mg/L [Benzidine >0-day I Average 0.000000069 [mg/L [Bervllium 30-day .Average 0.0()003,-I mg/L jVIAR jBis(2-chloi-oethoxy) [meth a ne 30-da) I.Average 0.0044 [mg/L VIAR Bis(2-chloi-oethyl) ether 30-day {.Average 0.000045 [mg/L I VIAR |Bis(2-chlorois(^propyi) ether j30-day [.Average I mg/L IMAR (Bis(2-ethylhexyl) phthalate |30-day {.Average 0.0035 I mg/L VIAR Cad mi {6 Month {Vledian 0.001 [mg/L MAR Cadmi I Da iiy {.Vlaximum 0.004 I mg/L [Ctidmiun-i {Instantaneous [O.OI [.XIaximum [mg/L [(-"arbi-iii Tetrachloride >0-da> .Average (1.0009 [mg/L VIAR Chlordane |30-day \veragc [0.000000023 [mg/L. VI.AR (:'hlorinaled Phenolics {6 iVIivnth {VIedian O.OOI I in g/L. JVLAR IChlorinated Phenivhcs (Daily {Vlaximum [0.004 [mg/L [('hlivrinaled Phenolics [Instanlaneoii.s [O.OI [Vlaximum mg/L [Ch lorohen/enc 130-day •Average [mg/L, |( 'hloroform |30-dav .\v erage 0.13 [tng/L [riirnmiLim |30-day .\v erage 190 [in g/L [Chromiun-i \'l I'-l Vionth [Median 0.002 [mg/L [('hi-omiiim \T Daily [.Vlaximum 0.008 [mg/L [("hromium \'l {Instantaneous (0.02 [Vlaxinium [mg/L ttp://endeavor.des.ucdavis.edu/wqsid/waterbody.asp?wb_fkey=3701 Page 5 of 8 {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan [Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plan {Ocean Plai [Ocean Plat [Ocean Plan [Ocean Plan {Ocean Plan {Ocean Plan (Ocean Plan {Ocean Plan {Ocean Plan 9/23/03 Water Quality Standards Inventory Database Page 6 of 8 MAR Chronic Toxicity Daily Maximum 0.001 TUc Ocean Plan MAR C(-)ppei-6 Month .VIedian 0.003 mg/L Ocean Plan MAR Copper Background sea water concentration 0.002 mg/L Ocean Plan MAR Copper Daily Vlaximum 0.012 mg/L Ocean Plan .VIAR Copper Instantaneous Vlaximum 0.03 mg/L Ocean Plan MAR Cyanide 6 Vionth .VIedian O.OOI mg/L Ocean Plan VIAR Cyanide Daily Maximum 0.004 mg/L Ocean Plan MAR Cyanide Instantaneous Vlaximum 0.01 mg/L Ocean Plan .VIAR DDT 30-day .Average 0.0000001 7 mg/L Ocean Plan VIAR Dichionibenzenes 30-day Average 5.1 mg/L Ocean Plan VIAR Dichloromethane 30-day .Average 0.45 mg/L Ocean Plan VIAR Dieldrin 30-day .Average 0.00000004 mg/L Ocean Plan .MAR Diethyl phthalate 30-day .Average 33 mg/L Ocean Plan MAR Dimethyl phthalate 30-day .Average 820 mg/L Ocean Plan VIAR L')i-n-butyl phthalate 30-day .Average 3.5 mg/L Ocean Plan VIAR Dissolved Oxygen --5 mg/L MAR Endosulfan 6 Month .VIedian 0.000009 mg/L Ocean Plan VIAR F-julosulfan Daily Vlaximum 0.000018 mg/L Ocean Plan VIAR Findi isiilf'an Instantaneous Vlaximum 0.000027 mg/L Ocean Plan MAR l-!ndriii 6 Vionth .VIedian ).000002 mg/L Ocean Plan VIAR L^ndrin Daily Vlaximum 0.000004 mg/L Ocean Pian VIAR :->iili-in Instantanetnis Vlaximum ). 000006 mg/L Ocean Plan VIAR -Jhvlhcn/.ene '^O-day \verage 4.1 ng/L Ocean Plan MAR -liioranthene ^^0-day \\ era iie ).0I5 ng/L Ocean Plan VIAR lalon-ieihancs '0-day \v erage ). 1 3 ng/L. Ocean Plan VIAR It'll -1 Vionth VIedian ).000004 ng/L Ocean Plan VIAR ICLI •)aily VIax imum •). 000008 ng/L. Ocean Plan VIAR KM nstantaneous Vlaximum ).00001 2 ng/L Dcean Plan VIAR leptachlor '0-day 1.00000072 ng/L Dcean Plan http://endeavor.des.ucdavis.edu/wqsid/waterbody.asp?wb_fkey=3701 9/23/03 Water Quality Standards Inventory Database Page 7 of 8 .Average iMAR Hexachlorobenzene 30-day Average 0.00000021 mg/L Ocean Plan VIAR Llexachli-irobutadiene 30-day Average 0.014 mg/L Ocean Plan .VIAR I-Iexachlori-icyclopentadiene 30-day Average 0.05S mg/L Ocean Plan MAR Llexachloroetliane 30-day .Average 0.0025 mg/L Ocean Plan VIAR Isophiirone 30-day .Average 150 mg/L Ocean Plan MAR Le.id 6 Vionth .VIedian 0.002 mg/L Ocean Plan MAR Lead Daily Vlaxim um 0.008 ing/L Ocean Plan VIAR Lead Instantaneous Vlaximum 0.02 mg/L Ocean Plan MAR VI ercury 6 Month VIedian 0.00004 mg/L Ocean Plan Water Quality Ammonia Criteria Beneficial Constituent Constituent Constituent Constituent Time Constituent Constituent Use Name pll Temperature Duration Concentration Units COLD .Ammonia as i\' ---0.025 mg/L IND .-\minonia ;is N ---0.025 mg/L MAR .Ammonia as N ---0.6 mg/L .MAR .An-itni-)nia as N ---2.4 mg/L VIAR .Ammonia as N ---6 mg/L RARE .-\mmonia as N ---0.025 mg/L RECl .Ammonia as N --0.025 mg/L REC2 .Amtn(-)nia as N ---0.025 mg/L WILD .Ammonia as N ---0.025 mg/L Water Quality Bacteria Criteria Beneficial Use Constituent Name Constituent Concentration Details Constituent ('onceutration Constituent Units Constituent Comments Constituent Reference RECl Fecal Coliform Log VIcan- lO'r of Samples for 30 day 400 (A>uni per 100 ml Log mean value. Based on more than 10 percent of tolal samples during any 30-day period. RFCI l-'ecal (.'oiiform Log Vlcan-5 Sam|-iles lor 3(1 day 200 Count per 100 ml Log mean value. Ba.sed on a minimum of not less than five samples for any 30-day period. RFC 2 Fecal (.'oiiform .•\ V erage-10'V of San-iplcs lor 30 day 4000 Count per 100 ml .Average value. Based on n-|ore than 10 percent of t(-ital samples during any 30-day period. REC2 Fecal C(ilil'(ii-n-i Average-for 30 dav 2000 C(-iunt per 100 ml .Average vakie. Based on samples for a 30-day period. SLIFLL Total ColihM'm V1edian-3 lube iesi.lO''{ of 330 Ci-)unt per 100 ml Median value. Based on more than 10 percent (-ifthe http://endeavor.des.ucdavis.edu/wqsid/waterbody.asp ?wb_fkey=3701 9/23/03 Water Quality Standards Inventory Database Page 8 of 8 Samples for 30 day samples collected during any 30-day period for a three-tube decimal dilution test. SHELL Total C(-iliform Median-5 tube test. 10'? of Samples f(->r 30 day 230 Count per 100 ml Median value. Ba.sed on more than 10 percent of the samples collected during any 30-day period for a five-tube decimal dilution test. SHELL Total Coliform VIedian-for 30 day 70 Count per 100 ml Median Value. Based on 30-day period. Comments Coniments Click above to go to the Comments input page. *N() Comments .Available © Inlormatioti Center for the Knvironment iufo® iceMcdciris.edu} Searcii.l Notices J WQSID Home http://endeavor.des.ucdavis.edu/wqsid/waterbody.asp?wb_fkey=3701 9/23/03 ATTACHMENT 5 - HYDROLOGIC UNIT MAP/DRAINAGE BASIN 0^ 1/ PontoS So lith Cadsbad\\ 3{ate Beach ^ Cadsbad\Tr7\ A r i i t Beach \^Vl^^-^-M^^ ^ J57 PaFdoiar M1^H/N?ON I oRT DOUBLE \MT WHITNt (220 PK A-,yj^ /atfer PetroglytlHiSop" ".y'V '.Watet Leqcadia^V^ Ponto\\ St Beach v.. _ . rXi Vj< "prfcinifasj hi Moonlighf-lrW "^Trk- ' // / SUte Beachlll }\~^ V ^\jP/ San AlejoW' - St Beach \ C^rxNff-by-lhe-Sea V Cardiff ^ S( Beach Solana Beach ^.i' Dfel Diosf , i,-^.""-^; '.Water Tank Rancho ! SO^'^ ^ ""^ • \ ? I .WT .i\Jolla Val /552 ATTACHMENT 6-HYDOLOGY STUDY HYDROLOGY AND HYDRAULIC STUDY FOR PACIFIC VIEW CONDOMINIUMS LOTS 1, 2 «& 3 OF MAP 1747 CORNER OF JUNIPER AVENUE & CARLSBAD BOULEVARD CITY OF CARLSBAD, CALIFORNIA ENGINEER OF WORK EXCEL ENGINEERING 440 State Place Escondido, CA 92029 (760) 745-8118 SEPTEMBER 22, 2003 HYDROLOGY STUDY OBJECTIVE The objective ofthis study is to determine the amount of mnoff that the project site is generating right now & compare it to the runoff that the finished project generates. CALCULATIONS Steps taken to get the Q(IOO) for each basin are as follows: 1) Determine Basin Areas Obtain runoff coefficients per Appendix IX-B IV-A-9 Rev. 5/81 and Appendi.x IX ofthe Manual. Forthis site use weighted C for the development and C=0.45 for the pre-development assuming soil group D. Calculate time of concentration per the Appendi,x X-A IV-A-10 Rev. 5/81 ofthe San Diego Hydrology Manual. 0.385 4) =(11.91'///) For natural basins Calculate intensities per Appendi,x XI IV-A-14 Rev 1/85 ofthe Manual 7; = (i.8(i.i-c)VZ)/5 For urban basins 1/3 / = 7.44?,/)-°*'' 5) Solve for the Q using Q=C[A Note: for all related maps and tables for this study see Appendix. PRE-DEVELOPMENT (100 YEAR STORM) BASIN (A)AREA (Acres) SOIL Type LENGTH (Feet) Difference In Elevation (High) (Low) H rc (Mins) rc+fo (Mins) 1 (In/Hr) C Q^CIA cfe 1 3.430 D 540 48 44 4 6.56 16.56 4.26 0.45 6.58 2 1.150 D 330 47.9 45.6 2.3 5.00 15.00 3.24 0.7 2.61 TOTAL 4.580 TOTAL 9.f9 The pre-development hydrology basin map is presented here in the Appendix. This generates 9.19 cfs of runoff as calculated for a 1 OO-year storm using the method as outlined in the San Diego County Hydrology Manual. However runoff (Q(100)=2.6Icfs) from Basin 2 is offsite, thus the only runoff on the site 6.58 cfs. Existing topography indicates that this runoffs flows to the east comer ofthe site including the offsite runoff thru the 6" pvc pipe, however, the flow form this 6" pvc vvill be disconnected and removed (please see attached letter). Thus, only the flow from the site will be considered. POST-DEVELOPMENT (100 YEAR STORM) Calculate Post-development Q(100) Time of Concentration TOTAL 13.212 The post-development hydrology basin map is presented here in the Appendix. Per the Manual a minimum 6 minutes is to be used on urban basins. From the above computation, it is shown that basin 3 (offsite basin of 1. 15 ac) have a runoff of 2 61 cfs thus leaving only 10.602 cfs as the final runoff for the developed site. This gives a 4.022 cfs of runoff increase. Calculate Q s to treat using the State Water Resource Control Board Requirements Per the Califomia Regional Water Quality Control Board, San Diego Region, order no. 2001-01 pa-es 18 & 19, in order to get the requires flow to be treated, we can either use : i. The maximum flow rate of mnoff produced fi-om a rainfall intensity of 0.2 inch of rainfall per hour- or 11. The maximum flow rate of mnoff produced by the 85th percentile hourly rainfall intensity as ' determined fi-om the local historical rainfall record, multiplied by a factor of two- or in. The maximum flow rate of mnoff, as determined from the local historical rainfall record that achieves approximately the same reduction in pollutant loads and flows as achieved by mitigation ofthe 85th percentile hourly rainfall intensity multiplied by a factor of two. For this project we are going to use the maximum flow rate of mnoff produced from a rainfall intensity of 0.2 inch of rainfall per hour. ^ (A) ARE A (Acres) SOIL Type LENGTH (Feet) Difference In Elevation (Higii) (Low) H Slope Tc (Mins) Tc (Use) I JinL 0(100) 0.670 1.200 0.100 1.150 0.067 0.250 50 46.5 157 48 260 49.7 46.25 46.5 47.1 D D D 130 48.6 330 47.9 140 140 49.2 47.1 0.25 0.50 6.41 6.00 1.5 0.96 0.20 9.16 2.6 1.00 9.00 0.20 11.61 12.00 45.6 47.8 1.5 2.3 1.15 0.20 7.83 8.00 0.70 0.20 14.75 1.4 1.4 1.00 8.52 15.00 9.00 0.20 0.20 0.7 0.7 0.7 0.7 0.7 0.01 0.09 0.17 0.01 0.16 10 IJ TOTAL 0.340 0.370 0.240 0.150 4.617 49.3 47.9 138 1.00 49.5 138 49.2 48 47.8 8.52 9.00 1,5 1.09 0.20 8.23 9.00 1.4 135 1.01 0.20 49.5 8.42 48.1 9.00 1.4 0.20 0.7 0.7 1.04 60 49.2 47.8 8.26 0.7 1.4 2.33 8.00 0.20 0.7 4.20 6.00 0.20 0.7 0.04 0.05 0.05 0.03 0.02 TOTAL 0.646 HYDRAULIC STUDY OBJECTIVE The purpose ofthis study is to show that the proposed storm drainage facilities are adequate to handle the flows that the project will generate. CALCULATIONS The following will be analyzed and designed to adequately handle the developed Q(IOO). 1. Analyze the capacity of a 2'x2' brooks box 2. Calculate effective treated mnoff of propose fossil filters for catch basins if they exceed the 85* percentile storm event. 3. Calculate the capacity of all storm drain system (pipes and catch basins) that will drain the site. 1. Analyze the capacity of a 2'x2' brooks box Determine the flow capacity in cubic feet per second for a 24"X24"Brooks Box grate type inlet using the following orifice equation of grate inlets in a sump. " Q(cap) = 4.S2Ay'' This equation is derived from the standard grate iniet formula from Seelye's Data Book for Civil Engineers book page 18-27. c=0.6. Also, consider a 2/3 factor to account clogging ofthe grates. Qicap) = cA4(2gy) Given: 2'x2' box We have: A= 4.000 sf Q(cap) = 9.13 cfs y = 0.5 ft Where A = Area of opening in square feet. y = Depth of flow at inlet or head of sump in fee Recall from the hydrology study that the maximum mnoff that goes to a brooks box is only 3.15 cfs (basin 3). Therefore the propose boxes are adequate to handle the Q(IOO) runoffs. 2. Calculate effective treated runoff of propose fossil fuel filter if they exceed the 85"" percentile storm event. From the attached Filtration Capacity Chart a 24" x 24" Brooks Box could treat up 100 gpm of flow. From our table computation the greatest flow is 0.17 cfs (basin #3) which is equivalent to about 76.3 gpm. Therefore, this project meets the Califomia Regional Water Quality Control Board requirements. 3. Calculate the capacity of all storm drain system (pipes and catch basins that will drain the site Please see Appendix for the attached flow computation from HydroFlow from Intelli-solve Sofhvare for pipe flow comtutations. Based on this flows we can conclude that the pipe systems proposed for the project are adequate to handle all flows. CONCLUSION From our summary tabulation we have for our pre development Q(IOO) total for the site (basin 1) is 6 56 cfs and for our post development Q(IOO) total for the site is 10.602 cfs. There is a increase in flow of 4 04^ cfs. Although there is a substantial increase on the mnoff flow, these flows directly to the existing storm drain system on the street, thus this proposed project will not adversely impact the existing downstream properties. APPENDIX RUNO.=F COE.=FICIE.\TS (.NATIONAL .MET^ HOOI L.'0.'D USE Undeveiuoed Residen"ial: Rur 2 1 Coefficient. C Soii Group (1} A B C ->v- . JO 40 . 55 .40 Single rainily . 40 • -^5 .50 . 55 Multi-Units * . 50 .60 Mobile Hones [2} . 43 . 50 . 55 Commercial (2) 80% IiTipervious . 70 . "5 .30 . .*- s Industrial (2) 30-i IiTiper/ious .30 .35 .90 •\ -3 .VOTES: '-•23 anrPw'S.'^^' °" of San.tat^n Wh.ere actual conditions deviate significantly frctn the taoula^ed imperviousness values of 30^5 or 90^.. the values given for coef'^ci^-- C, 3ay oe revised by .multiplying 30% or 90% by che rat'o of a---"-^'"' .nperviousness to t.he tabulated imperviousness. Howevlr. n no'^^s^- sn.nl. r.e final coerricient be less than 0.50. For -xa^no'e o^J commercial property oa D soil group. -va.TO.e. .ons...er .-\ctuai imperviousness = 50% Tabulated imperviousness = S0% Revised C = 4£ X 0.35 = 0.55 oO COUNTY OF SAN DICGO DEPARTMENT OF SAMITATIOfi & FLOOD CONTROL 33* m-mw 24-liOl R PRECIPITATION •2fl-^IS0PLUVI.fl.LS OF 100 -YEAR 24-HOUn PRECIPITATIOH IN EMTHS OF AN INCII U.S, Dl^PARTMbN NATIONAI. oct AMC AMO Al FLOOO CC.'ITflOL ^n.y ISOPLUVIALS OF 100-YEAR 6-liOUR PnECi-PiL'iTIOri lil tEfJTHS GF AN llXil U.S. DEPARTMEiV '«ATfO>fAL OCEANIC AJ«D AT loits DRAvcii. orrict or n 4 br r OF CO.M.MERCE OSPHCHfC AOWNUTRATJON IIROUOOV. NATIONAt WEATHEH SERVJCC ?I6* . I'jriTrrTr.nrlTrTTrTTT.rrTr^rrTTTxnmrr- . : . ; fT-r-rtTTTTrnnl-.n. l_- Equation: I a 7.44 p D -.645 6 I - Intensity (In./Hr.) » 6 Hr. Precipitation (In.) . D » Duration (Min.) Directions for Application: 1) From precipitation naps detennine 6 hr. and 24 hr. amounts for the selected frequency. These maps are printed in the County Hydrolony Manual (10, 50 And 100 yr. maps included in "th Oesign and Procedure Manual). 2) Adjust 6 hr. precipitation (if necessary) so that it is within the range of 45% to 652 of the 24 hr. precipitation. (Not r.pplicable to Desert) 3) Plot 6 hr. precipitation on the right side of the chart. 4) Draw a line through the point parallel to the plotted lines. 5) This line is the Intensity-duration curve for the location being analyzed. Application Form: 0) Selected Frequency /oo yr. 2) Adjusted *Pg» 3) t^ - 2.S 24 in. min. 4) I In/hr. •Not Applicable to Desert Region APPENDIX XI IV-A-14 Revised 1/S5 .see a^s^>/y ^F>F/?s oys^L/P/VD T//^£ OF FLOW CC/FI/FS ' — C» coeiBdcrrt of f«n^ 0/i^^.-7 .- Zcr^f/.^ tF F/s^- • SOO rr Oci^/Fs/s/r.' c!.^ Furc//. C -. SO F<rc:S • <^V-.'/<7,,^ ^//7i,'/^s SAN DiEGO COUNTY DEPA = T,VENT OF SPECIAL D:ST.S|CT SERVICES DESIGN MANUAL APPROVED /' ' ' ..r : "" U.R3iN A.REAS OVERLAND TIME OF FLOW CURVES CViTE APPENDIX X-C F£<:/ — Soaa — 4aaa —3 aao Fc 7c- l - // ' .SSS £Qa/?F/0/\/ 7//77a o/ concen/z-ez^'/cn 240 rv APPENDIX X-A -A-10 Rev. 5/Sl Otl TO 1 EUAK " DOSn j SOCt&'Wi T K) se REU)C*fED* > l<42.nC0NSm«JCT , 22-231N BXK 96l.f»«E l^FomS I iTA.O>00 1/ ' tCAaSBADBLVO* JiiHHiiinAmi.c 4T- BA|W:I , . ARp:A=p.D80 POST DEVELOPMENT CONDITION BERanurfEDir net ^ 8E nOOCATEoSf HO BASIN 4 AREA=0.10 AC Q<100)=0.34 CFS Hydraflow Plan View Project file: LINE-1 .stm IDF file: SAMPLE.IDF No. Lines: 5 09-23-2003 Hydraflow Summary Report Page 1 Line No. Line ID Flow rate (cfs) 5.81 5.81 3.70 0.55 0.21 Line size (In) 12 c 12 c 12 c 8 c 8 c Line length (ft) 11.5 25.0 80.0 41.0 44.0 Invert ELDn (ft) 39.28 40.89 41.15 42.00 42.50 invert EL Up (ft) 39.30 41.15 42.00 42.50 43.00 Project File: LINE-1.stm l-D-F File: SAMPLE.IDF Line slope (%) 0.174 1.040 1.062 1.220 1.136 HGL down (ft) 40.28' 41.89* 43.19* 44.21* 44.33* HGL up (ft) 40.59* 42.56* 44.06* 44.30* 44.34* Total No. Lines: 5 Minor loss (ft) 0.64 0.64 0.16 0.03 0.01 Dns line No. End 1 2 3 4 Run Date: 09-23-2003 NOTES: c = circular; e = elliptical; b = box; Return period = 100 Yrs.; * Indicates surcharge condition. Hydraflow Hydraulic Grade Line Computations Line Size (In) 12 12 12 8 8 (cfs) 5.81 5.81 3.70 0.55 0.21 Page 1 invert elev (ft) 39.28 40.89 41.15 42.00 42.50 Project File: LINE-1 .stm HGL elev (ft) 40.28 41.89 43.19 44.21 44.33 Downstream Depth (ft) 1.00 1.00* 1.00 0.67 0.67 Area (sqft) 0.79 0.79 0.79 0.35 0.35 Vel (ft/s: 7.40 7.40 4.71 1.58 0.60 Vel head (ft) 0.85 0.85 0.35 0.04 0.01 EGL elev (ft) 41.13 42.74 43.54 44.25 44.34 Sf (%) 2.663 2.663 1.080 0.207 0.030 Len (ft) 11.5 25.0 80.0 41.0 44.0 Invert elev (ft) 39.30 41.15 42.00 42.50 43.00 Upstream HGL elev (ft) 40.59 42.56 44.06 44.30 44.34 Depth (ft) 1.00 1.00 1.00 0.67 0.67 Area (sqft) 0.79 0.79 0.79 0.35 0.35 l-D-F File: SAI^PLE.IDF NOTES: Initial tailwater elevation = 40.28 (tt). * Normal depth assumed.. ** Critical depth assumed. 1 Vel (ft/s) 7.40 7.40 4.71 1.58 0.60 Vel head (ft) 0.85 0.85 0.35 0.04 0.01 EGL elev (ft) 41.44 43.41 44.40 44.34 44.35 Sf (%) 2.662 2.662 1.079 0.207 0.030 Checic Ave Sf (%) 2.662 2.662 1.080 0.207 0.030 Enrgy loss (ft) 0.306 0.666 0.864 0.085 0.013 JL coeff (K) 0.75 0.75 0.45 0.85 1.00 Total number of lines: 5 Run Date: 09-23-2003 Minor loss (ft) 0.64 0.64 0.16 0.03 0.01 storm Sewer Profile Elev. (ft) 56.0 52.0 48.0 44.0 40.0 36.0 Line: 1 Size: 12 (In) Line: 2 Size: 12 (in)- 25 50 Line: 3 Size: 12 (in) Line: 4 Size: 8 (in) 75 100 Line: 5 Size: 8 (in)- 125 150 175 200 Reach (ft) Proj. file: LINE-1 .stm 225 il! I 4 1 • kl] . j EXISTING REcioWMENPED J>ll>t REVISION EXISTING GARAGE U .fft XraiNOTEL.BISM ro ( EMAJN ^ RELOC^TED^ > » LET-VTEI 6-22-23 IN BOOK 961. WGE SOF^S 63M LoonSa Tonce SanDiego. CA92120-3011 May 22, 2003 Mason family trust 550 w. "c" St. #1770 San Diego, Ca. 92101 Dear Mason family trust. blvd. in Carlsbad. yo^r-property located at 3770 Carlsbad nnils"LtVJ}l//rill th'e'plSt"a-?Sf i?^ ^^^^^ condotninium . The problem is a^JL inch^eel T?Jf^'^.^^^ corrected, xn front of your garage, going unJe? ??^ ^^?^^^''^ ^^^^^^^ ^^ter property, i have been advised thaf Sh^f .^^""^^^ ^""^ draining into my into my property cSnstitutIs an n IPSJ?''^''.^'''''^^^ P^P^ draining ^ requesting as a good neiahhor ^'^^ ^^"^ therefore I am or 'n'etr.sTs.li^ It ^^^^^^tl^ ^^^^^^ or write to me at my above address P^^^se call me at 619-719-8585 be Ifi^ S"ppreclSed'*"'*"^°'"'°" " abovesaid problem will Sincerely James Zathas ^^""^ NHOr gg££02i 93:5^ £003/81/50 Law Office of Dan Konncrch Dan Konnerth, Arcorncy Ar Law 372 Creicwood Drive Oceinside, CA 92054 (760) 529-0703 June 27,2003 RE; APN #204-251 -04; APN M204-251 -OS; Permission to enter property and consent to installation of stopper on water pipe Dear Mrs Beckham: I represent Mr. Zathas in the above-entitled matter Both Mike Cn\hrr,^r. , A helpful in resolving this simple issue over thrwelkend 1^ 7^^^^^^ ZlTlt ''''P'P^^ 0 them wh n hey hoo3e to improve the property at absolutely no additional expense to them. ^ 1 am asking that both parties sign a release allowing Mr. Zathas to enter the property and install a pipe stopper tha: costs an estimated $4.00 from a home-supply store After I recdvTthe signatures from both the buyer and the sellers. I will forwa'r'd both documents scr t I foresee no problems and delays whatsoever with escrow closure provided we r=Teive Ih.T soon as possible. The installation could take as I.nle as few mttre P eie fmd att.^^^^^^^ agreement to be signed by both parties in escrow. Although I foresee no cr^bleml ^ ,H have any questions please call me at (760) 529-0703 or of myt rpll^O) 47^ ^ Thankfully, Dan Konnerth, Esq, CC: Mike Collimore, Ranch and Sea Realty 2963 Carlsbad Boulevard Carisbad, CA. 92008 CC: James Zathas Zaihasl.i 90:61 £003/61/60 •AGE B: 251-04 «»d2<>«.55l!!oy 'rrglgtead£A IrjaJ/y described « APN ^.204 '-J «Ilow Mr. 2*thas aad his wcr.-«rt^ if.«.. # u tgrtu o(i:o w^terpipe; (Fbwtcmor.7i!i«vUtri». or £ui±ofij,>i p«r^-r •jr-itii- * M»<mn F»fn;h Trwt") NA.M- ' DATED f0 39Vd NHOr 99££03^ 90 ••6T £003/61/50 ATTACHMENT 7 - SWPPP REVI.IIONS DATE NOI attached.' ( 1 Yes [ 1 No Storm VVater Pollution Prevention Plan (SVVPPP) Worksheet California Construction General Permit Worksheet 1. Project Information Project Name; PACIFIC VIEW CDNDDMINIUMS Projecl Location: Su-eet Address (or Equivalent): CARLSBAD BLVD CORNER JUNIPER AVE City: CARLSBAD County: SAN DIEGO Zip Cnde- _2 Project Owner: ZATHAS, JAMES AND KIKI REVOCABLE TRUST Contact Person: JAMES ZATHAS Phone No. - Owner's Mailing Address: Street Address (or Equivalent): 6384 LOURDES TERRACE City: SAN DIEGO County; SAN DIEGO Zin Cndp- 9?1?n [ ] Identify responsible personnel; [ ] Implementing and revising the SWPPP; [ j Inspecting equipment; Regular inspections of BMPs;_ Training employees about BMPs affecting their job:_ List all Contractors and Subcontractors responsible for implementing SWPPP for the project: NAME CONTACT PERSON DATE WORK BEGINS DATE WORK ENDS Construction Handbook 2 - 15 March, 1993 Worksheet 2. Project Sitt' Map Requirements Please Check the Boxes, and provide supponing inl'ormauon as requested: M Topographic Base Map Attached? Map shows: M An area extending one-quaner nule beyond the propeny boundaries of the con.struction site: [>/r The boundary of thc construction site. Construction Area = 3,43 Acres. [sA Nearby surface water bodies, including water courses, wetlands, springs and wells. [v4 Tlie location! s) where storm water drains onto or off of 'Jie propeny. [v/^ Boundary of off-site areas that drain into the constmction site. Site man(s) attached'' Maps show: (v^ Temporary storm water structures used during constmction. [•A Areas used to store soils and construction waste. [ Areas of cut and fill. [J! Drainage patterns and slopes anucipated after major grading activities, including the location [ vf Areas of soil disturbance. [y\ Locations of potential soil erosion requiring BMPs during construction. UJ Existing and proposed paved areas and buildings. Existing .Area;^ percent of site Proposed Area; 90__ percent of site M Estimated mnoff coefficient before constmction; 0,45 after constmction 0,7 (See the local municipality for approved mnoff coefficients for your communitT) L/] Locations where storm water stmctures and controls will be built to control storm water pollution after constmction is complele. I/] Tlte boundary of the drainage area upstream of each location where stomi water leaves the propeny. icivcs uie [y] Any vehicles storage and ser\'ice areas. [y\ Areas of existing vegetation. Construction HandlK>ok i \f. - " March, 1993 Worksheet 3. Inventory of Contractor's Activities and Special Site Conditions Provide a description of contractor's activities that could result in the di.scharge of ixjUutants in the storm water mnotf from the site. In addition, provide a description of special site condititms that may impact pollutants m storm water di.scharges. Contractor's Activities cSNl?RicT™'''''' ^^'^ ^P^^^^D °R LEAKED DN-SITE PRIOR TD W Describe conslruclion materials, equipment and vehicle.s Uiat comes in contact with slorm water: ly] Descnbe consu-ucuon matenal loading, unloading and access areas/activ,t,es: ASPHALT, WHICH WILL BE USED irEDMTELV UPON DLIVIR?'!! THE^OTE?™'""^ *™ 1/] Describe equipmeni storage, cleaning, and maintenance areas/acuvmes BERMED STAGING AREA. MAJDR EQUIPMENT REPAIRS WILL TAKE PLACE DFF-SITE ^MATrPT^ matenals (on-site and ot'f-site): mSPDSAL AREAS ' MATERIALS VILL BE TAKEN TO APKD" D DFKITE Special Site Conditions M Describe storm water structures and controls on the site pnor to construcuon and how these stnictures/controls will be integrated into liie SWPPP to reduce sediment and other pollutants in slorm water discharges: THERE WERE NO EXISTING STRUCTURES/CDNTRDLS DN-SITE PRIOR TO CDNSTRUCTIDN. [/\ List materials/waters other than storm water which will flow from the site during diy weather, the approximale amount of flow, and methods for preventing oUier dry weather flows: cSNS?RUC^mrPRDJECT''°^''"''''' ^^'^ '^^^'''^^ ^^-^^'^ BY THIS Construction Handbook 2-17 March, 1993 n a g «7 e n O. O 3 s Bi 3 Q. r 00 Worksheet 4. HMPs for Conlraclor Activities Ji^luonlsTof ^nLmTs^^^^^ adivities (sec Workshee. 3). For each BMP selecled idcn.ifv Chapter 4. BMPs for Contrac. or Aclivilies.) "'''^ '"^^'^ »nP«'P"ale information for (he BMP selec'Lf (.^a' Contractor Activities (Workshtet 3) Construciion I'ractices CAI I. Toxic material on- site 2. Construciion malerial equipment & vchicltis in coiiiaci Willi stonn water 3. MateriaJ loading, uiilondiiig and (iccess areas/acii'vilies Equipmeni storage cleaning, and maintenance areas/aciivities 5. Slorage and disposal of constructioit materials (on-site and off-siie) CAI CAJ Materials ..Management CAIO CAII CAI 2 CA2U Waste Management CA2I CA22 CA2J CAM Vehicle & l^quipmenl Management (A Jll t AJI I'AJJ I'rimiiry I'<illutanl(s) of t-'oncern SEE WORKSHEET NO. 3 VARIOUS BUILDING MATERIALS FUELS. OIL HYDRAULIC FLUIDS VARIOUS BLDG MATLS CONCRETE ASPHALT 1 fv4 Worksheet 5. BMPs for Erosion and Sedi mentation Control QUATERNARY-AGE TERRACE DEPOSITS, GENERAL AREA IS UNDERLAIN BY Provide a sile map showinsj locations where RMPV: fn,- ,.r,, .- i i- This map should be updated when BN^slireTSfelT^':'^ and sediment control are placed. Provide a brief descripUon of BMP selTaed a^M Yf i' n ^^"'^'"S'-•""stniciion conditions, additional information^or erosioTandl^diLl'tiinSr BMP^^ • BMPs SELECTED DESCRIPFION OF BMPs FOR EROSION & SEDIME.NTATION CONTROI. SITE PLANNING CONSIDERATIONS —T Scheduling Preservation of Existing Vegetation VEGETATION ON AREAS NDT AFFECTED BY CONSTRUCTION ' SOIL STABILIZATION y Seeding and Planting PSHER7 ^"^^^^L^Z^TIDN DF SLOPES, SITE Mulching PHY SICAL STABILIZATION ' Geotextiles and Mats Dust Control Temporary Stream Crossing ConsUTiction Road Stabilization \y Stabilized Consu-uciion Enu-ance DNf?MAJDR''°RDAD°^' VEHICULAR SEDIMENT TRACKING Construction Handbook 2 - 19 March. 1993 Construction Handbook 2 - 20 March, 1993 Worksheet 6. Post-Construction BMPs Provide a site map locating treatment coiurol BMPs which will he con.stmcted as pan of this project to reduce storm water p^Hluiion aher coastmcuon is complete. Selection of these and other post consimctiori BMPs may be guided using thc Municipal BMP HandUiok. and must consideVsite- spec.fic and seasonal conditions. Provide on the workshee. below the BMP selected, the responsible pany for maintenance and operation, and source for funding the operation and maintenance 1/ ' BMPs SELECTED MAINTENANCE KESPONSIIUMTY FUNDING SOURCE FOR O&M TREATME.NT CONTROL B.MPs (Sc^- Chapter 5. Municipal Handbook) Infiltration 1 — 1 N/A Wet Ponds N/A Constructed Wetlands N/A Vegetated Swales and Strips N/A Exiended Detention Basins N/A Media Fillration N/A OilAVater Separators and Water Quality Inlets N/A Multiple Systems N/A SOURCE CONTROL BMPs (See Chapter 4, Municipal Handbook) y SCIO-HDUSEKEEPING DWNER TO IMPLEENT DWNER OPERATIONS PRACTICES 5. MAINTENANCE ACTIVITY! y SCll - SAFER ALTERNATIVE OWNER TD IMPLEENT I — _| DWNER OPERATIONS j f PRODUCTS \ !< MAINTENANCE ACTIVITY Describe other measures which will be employed on the protect site to control stom consuucuon .s complete, and steps to be taken by the current owner to ensure that i 1 water pollulion after hese measures are conducted. Coastruction Handbook March, 1993 Worksheet 7. Monitoring, Inspection and Maintenance Plan lA Descnbe maintenance/reptur eflorLs to et.sure BMPs tire tn good and etTecuve condiuon: • SEDIMENTS WILL BE REMOVED FROM SILT FENCE, AND INLET PROTECTIONS WHFN SEDIMENT DEPTH REACHES 1/3 OF TOTAL AVAILABLE DEPTH. ""^"^"^^ ^^^^ • I^I^I ^^LT FENCE/INLET PROTECTION WASHED OUT DR OTHERWISE DISRUPTED Wtl 1 Rr REPLACED OR REPAIRED WITHIN 48 HOURS DF DISCOVERY i^i^KUPTED WILL BE M Describe mspecuon procedures and record keeping efforts: M Annual Inspecuon: THE DAY AFTER SITE CLEARING IS COMPLETED, AND ALL FRDSIDN AND SFDrMFiMTATinM \F] Pre-storm Inspection: ON DAYS BEFORE PREDICTED RAINFALL. A DRIVE BY INSPECTION WILL BF rniMniirTrn rn SAMAGE.'^" '''' INSPECTOR WILL CALL A CRETTS ISSEDIA'TELY TEPATR ° iA Post-storm Inspection: wS Sfc^ECKEfFSR°^^^'' INSPECTED WITHIN 48 HOURS AFTER EACH STORM, BMP'S 1,) STRUCTURAL INTEGRITY a.) SEDIMENT ACCUMULATION GREATER THAN 1/3 TOTAL DEPTH OF BMP 3. ) EVIDENCE DF EXCESSIVE SEDIMENT DOWNSTREAM DF THE SITE 4, ) EVIDENCE DF CONSTRUCTION MATERIALS WASHED OFF SITE [A Describe training program/material for site personnel responsible for installing, inspecting and maintaining BMPs: ero. \:r-r.l^^ ^'^'^'^ SHEETS FRDM THIS SWPPP WILL BE COPIED AND DISTRIBUTED Tn ^TTF SPIgSSN^r?E°m'H%\"lTlffH"crTU" ConstrucUon Handbook 2 - 22 March, 1993 Certificau'on I certify under penalty of law that this document and all attachments were prepared under my direction or supet^ision in accordance with a system designed to assure that qualtfied^?^ nnel pro^ 1^^ and evaluate the iniormation submitted. Based on mv inquiry of the person J^3ns Xm^ini ^ the system or those persons directly responsible for gathenn.'the infomi on th^ rrniat^^ submitted ,s to the best of my knowledge and belief, tme, accurate, and complete Traware that there are sigmf.can. penalties for submitting false information, including, the TOSsibi itv of3 imprisonment for knowing violations. ^ possibility of line and Name ROBERT D, DENTTNO Signature Title REG, CIVIL ENGINEER Date This SWPPP was prepared by; Name EXCEL ENGINEEING jitle ENGINEER DF WORK Signature Date Construction Handtiook 2 - 23 March, 1993 ATTACHMENT 8 - SSM ATTACHMENT G-1, CONSTRUCTION POLLUTANTS ATTACHMENT G-1 POLLUTANTS FROM THE PROJECT AREA Table 1 - Pollutants from the Project Area General Pollutant Categories Priority Project Categories Sediments Nutrients Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances OiI& Grease Bacteria & Viruses Pesticides Detached Residendal Development X X X X X X X Attached Residential Development X X X pd) pC) P X Commercial Development > 100,000 ft- pd) pd) pC) X p(5) X p(3) p(5) Automotive Repair Shops X X X Restaurants X X X X Hillside Development >5,000 ft- X X X X X X Parkina Lots pd) pd) X X pd) X pd) Streets. Highways & Freeways X pd) X X(4) X p(5) X Retail Gas Outlets X X X X = anticipated P = potential (1) A potential pollutant if landscaping exists on-site. (2) A potential pollutant ifthe project includes uncovered parking areas. (3) A potential pollutant if land use involves food or animal waste products. (4) Including petroleum hydrocarbons. (5) Including solvents. ATTACHMENT 9 - CONSTRUCTION BMPs Scheduling EC-1 Description and Purpose Scheduling is the development of a written plan that includes sequencing of construction activities and the implementation of BMPs such as erosion control and sediment control while taking local climate (rainfall, wind, etc.) into consideration. The purpose is to reduce the amount and duration of soil exposed to erosion by wind, rain, runoff, and vehicle tracking, and to perform the construction activities and control practices in accordance with the planned schedule. Suitable Applications Proper sequencing of construction activities to reduce erosion potential should be incorporated into the schedule of every construction project especially during rainy season. Use of other, more costly yet less effective, erosion and sediment control BMPs may often be reduced through proper construction sequencing. Limitations • Environmental constraints such as nesting season prohibitions reduce the full capabilities ofthis BMP. Implementation • Avoid rainy periods. Schedule major grading operations during dry months when practical. Allow enough time before rainfall begins to stabilize the soil with vegetation or physical means or to install sediment trapping devices. • Plan the project and develop a schedule showing each phase of construction. Clearly show how the rainy season relates to soil Objectives Erosion Control • Sediment Control • Tracking Control • Wind Erosion Control / Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective EC SE TC WE NS WM Targeted Constituents Sediment y Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 EC-1 SWPPP re-stabilization activities. Incorporate the construction schedule into the • Include on the schedule, details on the rainy season implementation and deployment of: Erosion control BMPs Sediment control BMPs Tracking control BMPs Wind erosion control BMPs Non-stormwater BMPs - Waste management and materials pollution control BMPs • Include dates for activities that may require non-stormwater discharges such as dewaterine sawcutting, grinding, drilling, boring, crushing, blasting, painting, hydro-demolition, mortar mixing, pavement cleaning, etc. • Work out the setquencing and timetable for the start and completion of each item such as site cleanng and grubbmg, grading, excavation, paving, foundation pouring utilities installation etc., to minimize the active construction area during the rainy season. - Sequence trenching activities so that most open portions are closed before new trenching begins. - Incorporate staged seeding and re-vegetation of graded slopes as work progresses. - Schedule establishment of permanent vegetation during appropriate planting time for specihed vegetation. • Non-active areas should be stabilized as soon as practical after the cessation of soil disturbing activities or one day prior to the onset of precipitation. • Monitor the weather forecast for rainfall. • When rainfall is predicted, adjust the construction schedule to allow the implementation of soil stabilization and sediment treatment controls on all disturbed areas prior to the onset of rain. • Be prepared year round to deploy erosion control and sediment control BMPs Erosion mav be caused during dry seasons by un-seasonal rainfall, wind, and vehicle tracking Keep the site stabilized year round, and retain and maintain rainy season sediment trappine devices in operational condition. • Apply permanent erosion control to areas deemed substantially complete during the project's defined seeding window. Costs Construction scheduling to reduce erosion may increase other construction costs due to reduced economies of scale m performing site grading. The cost effectiveness of scheduling techniques should be compared with the other less effective erosion and sedimentation controls to achieve a cost effective balance. California Stormwater BMP Handbook January 2OO3" Construction www.cabmphandbooks.com Scheduling EC-1 Inspection and Maintenance • Verify that work is progressing in accordance with the schedule. If progress deviates, take corrective actions. • Amend the schedule when changes are warranted. • Amend the schedule prior to the rainy season to show updated information on the deployment and implementation of construction site BMPs. References Stormwater Quality Handbooks Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities Developing Pollution Prevention Plans and Best Management Practices (EPA 832-R-92-005), U.S. Environmental Protection Agency, Office of Water, Septemberi992. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbooks.com Preservation Of Existing Vegetation EC-2 Description and Purpose Carefully planned preservation of existing vegetation minimizes the potential of removing or injuring existing trees, vines, shrubs, and grasses that protect soil from erosion. Suitable Applications Preservation of existing vegetation is suitable for use on most projects. Large project sites often provide the greatest opportunity for use of this BMP. Suitable applications include the following: • Areas within the site where no construction activity occurs, or occurs at a later date. This BMP is especially suitable to multi year projects where grading can be phased. • Areas where natural vegetation exists and is designated for preservation. Such areas often include steep slopes, watercourse, and building sites in wooded areas. • Areas where local, state, and federal government require preservation, such as vernal pools, wetlands, marshes, certain oak trees, etc. These areas are usually designated on the plans, or in the specifications, permits, or environmental documents. • Where vegetation designated for ultimate removal can be temporarily preserved and be utilized for erosion control and sediment control. Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollufion Control Legend: ^ Primary Objective •/ Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 4 EC-2 Preservation Of Existing Vegetation Limitations • Requires forward planning by the owner/developer, contractor, and design staff. • Limited opportunities for use when project plans do not incorporate existing vegetation into the site design. • For sites with diverse topography, it is often difficult and e.xpensive to save existing trees while grading the site satisfactory for the planned development. Implementation The best way to prevent erosion is to not disturb the land. In order to reduce the impacts of new development and redevelopment, projects may be designed to avoid disturbing land in sensitive areas of the site (e.g., natural watercourses, steep slopes), and to incorporate unique or desirable existing vegetation into the site's landscaping plan. Clearly marking and leaving a buffer area around these unique areas during construction will help to preserve these areas as well as take advantage of natural erosion prevention and sediment trapping. E.xisting vegetation to be preserved on the site must be protected from mechanical and other injury while the land is being developed. The purpose of protecting existing vegetation is to ensure the survival of desirable vegetation for shade, beautification, and erosion control. Mature vegetation has extensive root systems that help to hold soil in place, thus reducing erosion. In addition, vegetation helps keep soil from tlrying rapidly and becoming susceptible to erosion. To effectively save existing vegetation, no disturbances of any kind should be allowed within a defined area around the vegetation. For trees, no construction activity should occur within the drip line of the tree. Timing • Provide for preservation of existing vegetation prior to the commencement of clearing and grubbing operations or other soil disturbing activities in areas where no construction activity is planned or will occur at a later date. Design and Layout u Mark areas to be preserved with temporary fencing. Include sufficient setback to protect roots. - Orange colored plastic mesh fencing works well. - Use appropriate fence posts and adequate post spacing and depth to completely support the fence in an upright position. • Locate temporary roadways, stockpiles, and layout areas to avoid stands oftrees, shrubs, and grass. • Consider the impact of grade changes to e.xisting vegetation and the root zone. • Maintain existing irrigation systems where feasible. Temporary irrigation may be required. • Instruct employees and subcontractors to honor protective devices. Prohibit heavy equipment, vehicular traffic, or storage of construction materials within the protected area. 2 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Preservation Of Existing Vegetation EC-2 Costs There is little cost associated with preserving existing vegetation if properly planned during the project design, and these costs may be offset by aesthetic benefits that enhance property values. During construction, the cost for preserving existing vegetation will likely be less than the cost of applying erosion and sediment controls to the disturbed area. Replacing vegetation inadvertently destroyed during construction can be e.xtremely expensive, sometimes in excess of $10,000 per tree. Inspection and Maintenance During construction, the limits of disturbance should remain clearly marked at all times. Irrigation or maintenance of existing vegetation should be described in the landscaping plan. If damage to protected trees still occurs, maintenance guidelines described below should be followed: • Verify that protective measures remain in place. Restore damaged protection measures immediately. • Serious tree injuries shall be attended to by an arborist. • Damage to the crown, trunk, or root system of a retained tree shall be repaired immediately. • Trench as far from tree trunks as possible, usually outside of the tree drip line or canopy. Curve trenches around trees to avoid large roots or root concentrations. If roots are encountered, consider tunneling under them. When trenching or tunneling near or under trees to be retained, place tunnels at least 18 in. below the ground surface, and not below the tree center to minimize impact on the roots. • Do not leave tree roots exposed to air. Cover exposed roots with soil as soon as possible. If soil covering is not practical, protect exposed roots with wet burlap or peat moss until the tunnel or trench is ready for backfill. • Cleanly remove the ends of damaged roots with a smooth cut. • Fill trenches and tunnels as soon as possible. Careful filling and tamping will ehminate air spaces in the soil, which can damage roots. • If bark damage occurs, cut back all loosened bark into the undamaged area, with the cut tapered at the top and bottom and drainage provided at the base of the wood. Limit cutting the undamaged area as much as possible. • Aerate soil that has been compacted over a trees root zone by punching holes 12 in. deep with an iron bar, and moving the bar back and forth until the soil is loosened. Place holes 18 in. apart throughout the area of compacted soil under the tree crown. • Fertilization - Fertilize stressed or damaged broadleaf trees to aid recovery. - Fertilize trees in the late fall or early spring. January 2003 California Stormwater BMP Handbook 3 of 4 Construction www.cabmphandbooks.com EC-2 Preservation Of Existing Vegetation - Apply fertilizer to the soil over the feeder roots and in accordance with label instructions, but never closer than 3 ft to the trunk. Increase the fertilized area by one-fourth of the crown area for conifers that have extended root systems. • Retain protective measures until all other construction activity is complete to avoid damage during site cleanup and stabilization. References County of Sacramento Tree Preservation Ordinance, September 1981. Stormwater Quality Handbooks Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management of the Puget Sound Basin, Technical Manual, Publication #91-75, Washington State Department of Ecology, February 1992. Water Quality Management Plan for The Lake Tahoe Region, Volume II, Handbook of Management Practices, Tahoe Regional Planning Agency, November 1988. 4 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Gravel Bag Berm SE-6 Description and Purpose A gravel bag berm is a series of gravel-filled bags placed on a level contour to intercept sheet flows. Gravel bags pond sheet flow runoff, allowing sediment to settle out, and release runoff slowly as sheet flows, preventing erosion. Suitable Applications Gravel bag berms maybe suitable: • As a linear sediment control measure: Below the toe of slopes and erodible slopes - As sediment traps at culvert/pipe outlets Below other small cleared areas - Along the perimeter of a site Down slope of exposed soil areas Around temporary stockpiles and spoil areas Parallel to a roadway to keep sediment off paved areas Along streams and channels • As linear erosion control measure: Objectives EC Erosion Control SE Sediment Control TC Tracking Control WE Wind Erosion Control Non-Stonnwater Management Control • NS ™ Waste Management and Matetials Pollution Control Legend: Primary Objective / Secondary Objective Targeted Constituents Sediment < Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives SE-1 Silt Fence SE-5 Fiber Roll SE-8 Sandbag Barrier SE-9 Straw Bale Bam'er CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 4 SE-6 Gravel Bag Berm Along the face and at grade breaks of exposed and erodible slopes to shorten slope length and spread runoff as sheet flow - At the top of slopes to divert runoff away firom disturbed slopes - As check dams across mildly sloped construction roads Limitations • Gravel berms may be difficult to remove. • Removal problems limit their usefulness in landscaped areas. • Gravel bag berm may not be appropriate for drainage areas greater than 5 acres. • Runoff will pond upstream of the filter, possibly causing flooding if sufficient space does not exist. • Degraded gravel bags may rupture when removed, spilling contents. • Installation can be labor intensive. • Berms may have limited durability for long-term projects. • 'When used to detain concentrated flows, maintenance requirements increase. Implementation General A gravel bag berm consists of a row of open graded gravel-filled bags placed on a level contour. 'When appropriately placed, a gravel bag berm intercepts and slows sheet flow runoff, causing temporary ponding. The temporary ponding provides quiescent conditions allowing sediment to settle. The open graded gravel in flie bags is porous, which allows the ponded runoff to flow slowly through the bags, releasing the runoff as sheet flows. Gravel bag berms also interrupt the slope length and thereby reduce erosion by reducing the tendency of sheet flows to concentrate into rivulets, which erode rills, and ultimately gullies, into disturbed, sloped soils. Gravel bag berms are similar to sand bag barriers, but are more porous. Design and Layout m Locate gravel bag berms on level contours. Slopes between 20:1 and 2:1 (H:V): Gravel bags should be placed at a ma.ximum interval of 50 ft (a closer spacing is more effective), with the first row near the slope toe. Slopes 2:1 (H:V) or steeper: Gravel bags should be placed at a maximum interval of 25 ft (a closer spacing is more effective), with the first row placed the slope toe. • Turn the ends of the gravel bag barriers up slope to prevent runoff from going around the berm. • Allow sufficient space up slope from the gravel bag berm to allow ponding, and to provide room for sediment storage. 2 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Gravel Bag Berm SE-6 • For installation near the toe of the slope, consider moving the gravel bag barriers away ft-om the slope toe to facilitate cleaning. To prevent flows behind the barrier, bags can be placed perpendicular to a berm to serve as cross barriers. • Drainage area should not exceed 5 acres. • In Non-Traffic Areas: Height = 18 in. maximum Top widfh = 24 in. minimum for three or more layer construction Top width = 12 in. minimum for one or two layer construction Side slopes = 2:1 or flatter • In Construction Traffic Areas: Height = 12 in. maximum Top width = 24 in. minimum for three or more layer construction. Top widfh = 12 in. minimum for one or two layer construction. Side slopes = 2:1 or flatter. • Butt ends of bags tightly • On multiple row, or multiple layer construction, overiapp butt joints of adjacent row and row beneath. • Use a pyramid approach when stacking bags. MateriaZs • Bag Material: Bags should be woven polypropylene, polyethylene or polyamide fabric or burlap, minimum unit weight of 4 ounces/yd==, Mullen burst strength exceeding 300 Ib/in^ in conformance with the requirements in ASTM designation D3786, and ultraviolet stability exceeding 70% in conformance with the requirements in ASTM designation D4355. • Bag Size: Each gravel-filled bag should have a length of 18 in., width of 12 in., thickness of 3 in., and mass of appro.ximately 33 lbs. Bag dimensions are nominal, and may vary based on locally available materials. • FiZZ Material: Fill material should be 0.5 to 1 in. Class 2 aggregate base, clean and free from clay, organic matter, and other deleterious material, or other suitable open graded, non-cohesive, porous gravel. Costs Gravel filter: Expensive, since off-site materials, hand construction, and demolition/removal are usually required. Material costs for gravel bags are average of $2.50 per empty gravel bag. Gravel costs range from $20-$35 per yds. January 2003 California Stormwater BMP Handbook 3 of 4 Construction www.cabmphandbooks.com SE-6 Gravel Bag Berm Inspection and Maintenance • Inspect BMPs prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non-rainy season. • Gravel bags exposed to sunlight will need to be replaced every two to three months due to degrading of the bags. • Reshape or replace gravel bags as needed. • Repair washouts or other damage as needed. • Sediment that accumulates in the BMP must be periodically removed in order to maintain BMP effectiveness. Sediment should be removed when the sediment accumulation reaches one-third of the barrier height. Sediment removed during maintenance may be incorporated into earthwork on the site or disposed at an appropriate location. • Remove gravel bag berms when no longer needed. Remove sediment accumulation and clean, re-grade, and stabilize the area. Removed sediment should be incorporated in the project or disposed of. References Handbook of Steel Drainage and Highway Construction, American Iron and Steel Institute, 1983. Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Pollution Plan Handbook, First Edition, State of California, Department of Transportation Division of New Technology, Materials and Research, October 1992. 4 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com street Sweeping and Vacuuming SE-7 Description and Purpose Street sweeping and vacuuming includes use of self-propelled and walk-behind equipment to remove sediment from streets and roadways, and to clean paved surfaces in preparation for final paving. Sweeping and vacuuming prevents sediment from the project site from entering storm drains or receiving waters. Suitable Applications Sweeping and vacuuming are suitable anywhere sediment is tracked from the project site onto public or private paved streets and roads, typically at points of egress. Sweeping and vacuuming are also applicable during preparation of paved surfaces for final paving. Limitations Sweeping and vacuuming may not be effective when sediment is wet or when tracked soil is caked (caked soil may need to be scraped loose). Implementation • Controlling the number of points where vehicles can leave the site will allow sweeping and vacuuming efforts to be focused, and perhaps save money. • Inspect potential sediment tracking locations daily. • Visible sediment tracking should be swept or vacuumed on a daily basis. Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stonnwater Management Control Waste Management and Materials Pollution Control • Legend: ^ Primary Objective / Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 2 SE-7 Street Sweeping and Vacuuming • Do not use kick brooms or sweeper attachments. These tend to spread the dirt rather than remove it. • If not mixed with debris or trash, consider incorporating the removed sediment back into the project Costs Rental rates for self-propelled sweepers vary depending on hopper size and duration of rental. Expect rental rates from $58/hour (3 yds hopper) to $88/hour (9 yds hopper), plus operator costs. Hourly production rates vary with the amount of area to be swept and amount of sediment. Match the hopper size to the area and expect sediment load to minimize time spent dumping. Inspection and Maintenance • Inspect BMPs prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non-rainy season. • 'When actively in use, points of ingress and egress must be inspected daily. • When tracked or spilled sediment is observed outside the construction limits, it must be removed at least daily. More frequent removal, even continuous removal, may be required in some jurisdictions. • Be careful not to sweep up any unknown substance or any object that may be potentially hazardous. • Adjust brooms frequentiy; maximize efficiency of sweeping operations. • After sweeping is finished, properly dispose of sweeper wastes at an approved dumpsite. References Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Labor Surcharge and Equipment Rental Rates, State of California Department of Transportation (Caltrans), April 1, 2002 - March 31, 2003. 2 of 2 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Sandbag Barrier SE-8 Description and Purpose A sandbag barrier is a series of sand-filled bags placed on a level contour to intercept sheet flows. Sandbag barriers pond sheet flow runoff, allowing sediment to settle out. Suitable Applications Sandbag barriers may be suitable: • As a linear sediment control measure: Below the toe of slopes and erodible slopes As sediment traps at culvert/pipe outiets Below other small cleared areas Along the perimeter of a site Down slope of exposed soil areas Around temporary stockpiles and spoil areas Parallel to a roadway to keep sediment off paved areas Along streams and channels • As linear erosion control measure: - Along the face and at grade breaks of exposed and erodible slopes to shorten slope length and spread runoff as sheet flow Objectives EC Erosion Control SE Sediment Control TC Tracking Control WE Wind Erosion Control Non-Stomiwater Management Control • • NS Waste Management and Materials Pollution Control Legend: ^ Primary Objective J Secondary Objective Targeted Constituents Sediment % Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives SE-1 Silt Fence SE-5 Fiber Rolls SE-6 Gravel Bag Berm SE-9 Straw Bale Banier CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 6 SE-8 Sandbag Barrier - At the top of slopes to divert runoff away from disturbed slopes As check dams across mildly sloped construction roads Limitations • It is necessary to limit the drainage area upstream of the barrier to 5 acres. • Degraded sandbags may rupture when removed, spilling sand. • Installation can be labor intensive. • Barriers may have limited durability for long-term projects. • When used to detain concentrated flows, maintenance requirements increase. • Burlap should not be used for sandbags. Implementation General A sandbag barrier consists of a row of sand-filled bags placed on a level contour. When appropriately placed, a sandbag barrier intercepts and slows sheet flow runoff, causing temporary ponding. The temporary ponding provides quiescent conditions allowing sediment to settie. 'While the sand-filled bags are porous, the fine sand tends to quickly plug with sediment, limiting the rate of flow through the barrier. If a porous barrier is desired, consider SE-1, SOt Fence, SE-5, Fiber Rolls, SE-6, Gravel Bag Berms, or SE-9, Straw Bale Barriers. Sandbag barriers also interrupt the slope length and thereby reduce erosion by reducing the tendency of sheet flows to concentrate into rivulets which erode rills, and ultimately gullies, into disturbed, sloped soils. Sandbag barriers are similar to ground bag berms, but less porous. Design and Layout • Locate sandbag barriers on a level contour. Slopes between 20:1 and 2:1 (H:V): Sandbags should be placed at a maximum interval of 50 ft (a closer spacing is more effective), with the first row near the slope toe. - Slopes 2:1 (H:V) or steeper: Sandbags should be placed at a maximum interval of 25 ft (a closer spacing is more effective), with the first row placed near the slope toe. • Turn the ends of the sandbag barrier up slope to prevent runoff from going around the barrier. • Allow sufficient space up slope from the barrier to allow ponding, and to provide room for sediment storage. • For installation near the toe of the slope, consider moving the barrier away from the slope toe to facilitate cleaning. To prevent flow behind the barrier, sandbags can be placed perpendicular to the barrier to serve as cross barriers. • Drainage area should not exceed 5 acres. 2 of 6 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Sandbag Barrier SE-8 • Stack sandbags at least three bags high. • Butt ends of bags tightiy. • Overiapp butt joints of row beneath with each successive row. • Use a pyramid approach when stacking bags. • In non-traffic areas Height = 18 in. maximum - Top width = 24 in. minimum for three or more layer construction - Side slope = 2: i or flatter • In construction traffic areas Height = 12 in. maximum - Top width = 24 in. minimum for three or more layer construction. Side slopes = 2:1 or flatter. MateWaZs • Sandbag Material: Sandbag should be woven polypropylene, polyethylene or polyamide fabric, minimum unit weight of 4 ounces/yd^, Mullen burst strength exceeding 300 Ib/in^ in conformance with the requirements in ASTM designation D3786, and ultraviolet stability exceeding 70% in conformance with the requirements in ASTM designation D4355. Use of burlap may not acceptable in some jurisdictions. • Sandbag Size: Each sand-filled bag should have a length of 18 in., width of 12 in., thickness of 3 in., and mass of approximately 33 lbs. Bag dimensions are nominal, and may vary based on locally available materials. • Fi'ZZ Material: All sandbag fill material should be non-cohesive, Class 1 or Class 2 permeable material free from clay and deleterious material. Costs Sandbag barriers are more costiy, but typically have a longer useful life than other barriers. Empty sandbags cost $0.25 - $0.75. Average cost of fill material is $8 per yds. Pre-filled sandbags are more expensive at $1.50 - $2.00 per bag. Inspection and Maintenance • Inspect BMPs prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non-rainy season. • Sandbags exposed to sunlight vall need to be replaced every two to three months due to degradation of the bags. • Reshape or replace sandbags as needed. January 2003 California Stormwater BMP Handbook 3 of 6 Construction www.cabmphandbooks.com SE-8 Sandbag Barrier • Repair washouts or other damage as needed. • Sediment that accumulates in the BMP must be periodically removed in order to maintain BMP effectiveness. Sediment should be removed when the sediment accumulation reaches one-third of the barrier height. Sediment removed during maintenance may be incorporated into earthwork on the site or disposed at an appropriate location. • Remove sandbags when no longer needed. Remove sediment accumulation, and clean, re- grade, and stabilize the area. References Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. 4 of 6 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com • Sandbag Barrier SE-8 yi January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 5 of 6 SE-8 Sandbag Barrier 6 of 6 California Stormwater BMP Handbook Construction www.cabmphandbooks.com January 2003 stabilized Construction Entrance/Exit TC-1 Description and Purpose A stabilized construction access is defined by a point of entrance/exit to a construction site that is stabilized to reduce the tracking of mud and dirt onto public roads by construction vehicles. Suitable Applications Use at construction sites: • Where dirt or mud can be tracked onto public roads. • Adjacent to water bodies. • Where poor soils are encountered. • Where dust is a problem during dry weather conditions. Limitations • Entrances and exits require periodic top dressing with additional stones. • This BMP should be used in conjunction with street sweeping on adjacent public right of way. • Entrances and exits should be constructed on level ground only. • Stabilized construction entrances are rather expensive to construct and when a wash rack is included, a sediment trap of some kind must also be provided to collect wash water runoff. Objectives EC Erosion Control SE Sediment Control • TC Tracking Control • WE Wind Erosion Control NS Non-Stormwater NS Management Control WM Waste Management and WM Materials Pollution Control Legend: ^ Primary Objective • Secondary Objective Targeted Constituents Sediment ,^ Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 6 stabilized Construction Entrance/Exit TC-1 Implementation General A stabilized construction entrance is a pad of aggregate underlain with filter cloth located at any point where traffic will be entering or leaving a construction site to or firom a public right of way, street, alley, sidewalk, or parking area. The purpose of a stabilized construction entrance is to reduce or eliminate the tracking of sediment onto public rights of way or streets. Reducing tracking of sediments and other pollutants onto paved roads helps prevent deposition of sediments into local storm drains and production of airborne dust. Where traffic will be entering or leaving the construction site, a stabilized construction entrance should be used. NPDES permits require that appropriate measures be implemented to prevent tracking of sediments onto paved roadways, where a significant source of sediments is derived from mud and dirt carried out from unpaved roads and construction sites. Stabilized construction entrances are moderately effective in removing sediment from equipment leaving a construction site. The entrance should be built on level ground. Advantages of the Stabilized Construction Entrance/Exit is that it does remove some sediment fi-om equipment and serves to channel construction traffic in and out ofthe site at specified locations. Efficiency is greatly increased when a washing rack is included as part ofa stabilized construction entrance/exit. Design and Layout Construct on level ground where possible. Select 3 to 6 in. diameter stones. Use minimum depth of stones of 12 in. or as recommended by soils engineer. Construct length of 50 ft minimum, and 30 ft minimum width. Rumble racks constructed of steel panels with ridges and installed in the stabilized entrance/exit will help remove additional sediment and to keep adjacent streets clean. Provide ample turning radii as part of the entrance. Limit the points of entrance/exit to the construction site. Limit speed of vehicles to control dust. Properly grade each construction entrance/exit to prevent runoff from leaving the construction site. Route runoff from stabilized entrances/exits through a sediment trapping device before discharge. Design stabilized entrance/exit to support heaviest vehicles and equipment that will use it. Select construction access stabilization (aggregate, asphaltic concrete, concrete) based on longevity, required performance, and site conditions. Do not use asphalt concrete (AC) grindings for stabilized construction access/roadway. 2 of 6 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com stabilized Construction Entrance/Exit TC-1 • If aggregate is selected, place crushed aggregate over geotextile fabric to at least 12 in. depth, or place aggregate to a depth recommended by a geotechnical engineer. A crushed aggregate greater than 3 in. but smaller than 6 in. should be used. • Designate combination or single purpose entrances and exits to the construction site. • Require that all employees, subcontractors, and suppliers utilize the stabilized construction access. • Implement SE-7, Street Sweeping and Vacuuming, as needed. • All exit locations intended to be used for more than a two-week period should have stabilized construction entrance/exit BMPs. Inspection and Maintenance • Inspect and verify that activit}'-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMPs are under way, inspect weekly during the rainy season and of two-week intervals in the non-rainy season to verify continued BMP implementation. • Inspect local roads adjacent to the site daily. Sweep or vacuum to remove visible accumulated sediment. • Remove aggregate, separate and dispose of sediment if construction entrance/exit is clogged with sediment. • Keep all temporary roadway ditches clear. • Check for damage and repair as needed. • Replace gravel material when surface voids are visible. • Remove all sediment deposited on paved roadways within 24 hours. • Remove gravel and filter fabric at completion of construction Costs Average annual cost for installation and maintenance may vary from $1,200 to $4,800 each, averaging $2,400 per entrance. Costs will increase with addition of washing rack, and sediment trap. With wash rack, costs range from $1,200 - $6,000 each, averaging $3,600 per entrance. References Manual of Standards of Erosion and Sediment Control Measures, Association of Bay Area Governments, May 1995. National Management Measures to Control Nonpoint Source Pollution from Urban Areas, USEPA Agency, 2002. Proposed Guidance Specifying Management Measures for Sources of Nonpoint Pollution in Coastal Waters, Work Group Working Paper, USEPA, April 1992. January 2003 California Stormwater BMP Handbook 3 of 6 Construction www.cabmphandbooks.com stabilized Construction Entrance/Exit TC-1 Stormwater Quality Handbooks Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management of the Puget Sound Basin, Technical Manual, Pubhcation #91-75, Washington State Department of Ecology, February 1992. Virginia Erosion and Sedimentation Control Handbook, Virginia Department of Conservation and Recreation, Division of Soil and Water Conservation, 1991. Guidance Specifying Management Measures for Nonpoint Pollution in Coastal Waters, EPA 840-B-9-002, USEPA, Office of Water, Washington, DC, 1993. Water Quality Management Plan for the Lake Tahoe Region, Volume II, Handbook of Management Practices, Tahoe Regional Planning Agency, November 1988. 4 of 6 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com stabilized Construction Entrance/Exit TC-1 Crushed aggregate greater than 3" but smaller than 6" •Filter fabric Original 1—12 " Min, unless otherwise specified by a soils engineer SECTION B-B NTS < Q < O Q LJ > < D- O in X NOTE; I Construct sediment barrier and channelize runoff to Ot\ sediment trapping device Match Existing Grade or four times the circumference of the largest construction vehicle ti^'e, whichever is greater PLAN NTS Width as required to accomodate anticipated traffic January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 5 of 6 stabilized Construction Entrance/Exit TC-1 Crushed aggregate greater than 3" but smaller than 6". Original y-Filter fabric 1-12" Min, unless otherwise specified by a soils engineer SECTION B-B NTS Crushed aggregate greater than 3" but smaller than 6". Corrugated steel panels Original 12" Min, unless otherwise specified by a soils engineer Filter fabric SECTION A-A NOT TO SCALE NOTE: Construct sediment barrier and channelize runoff to sediment trapping device Sediment trapping device >-< S: Q < O Q: Q IJJ > < CL. O 00 X UJ Corrugated steel panels A t—B 10' min or as required to accomodate anticipated traffic, whichever 's greater. Match Existing Grade or four times the circumference of the largest construction vehicle tire, whichever is greater PLAN NTS 6 of 6 California Stormwater BMP Handbook Construction www.cabmphandbooks.com January 2003 Wind Erosion Control WE-1 Description and Purpose Wind erosion or dust control consists of applying water or other dust palliatives as necessary to prevent or alleviate dust nuisance generated by construction activities. Covering small stockpiles or areas is an alternative to applying water or other dust palliatives. Suitable Applications Wind erosion control BMPs are suitable during the following construction activities: • Construction vehicle traffic on unpaved roads • Drilling and blasting activities • Sediment tracking onto paved roads • Soils and debris storage piles • Batch drop from front-end loaders • Areas with unstabilized soil • Final grading/site stabilization Limitations • Watering prevents dust only for a short period and should be applied daily (or more often) to be effective. • Over watering may cause erosion. Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Managemenl and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 5 WE-1 Wind Erosion Controi Oil or oil-treated subgrade should not be used for dust control because the oil may migrate into drainageways and/or seep into the soil. Effectiveness depends on soil, temperature, humidity, and wind velocity. Chemically treated sub grades may make the soil water repellant, interfering with long-term infiltration and the vegetation/re-vegetation of the site. Some chemical dust suppressants may be subject to freezing and may contain solvents and should be handled properly. Asphalt, as a mulch tack or chemical mulch, requires a 24-hour curing time to avoid adherence to equipment, worker shoes, etc. Application should be limited because asphalt surfacing may eventually migrate into the drainage system. • In compacted areas, watering and other liquid dust control measures may wash sediment or other constituents into the drainage system. Implementation General California's Mediterranean climate, with short wet seasons and long hot dry seasons, allows the soils to thoroughly dry out. During these dry seasons, construction activities are at their peak, and disturbed and exposed areas are increasingly subject to wind erosion, sediment tracking and dust generated by construction equipment. Dust control, as a BMP, is a practice that is already in place for many construction activities. Los Angeles, the North Coast, and Sacramento, among others, have enacted dust control ordinances for construction activities that cause dust to be transported beyond the construction project property line. Recently, the State Air Resources Control Board has, under the authority ofthe Clean Air Act, started to address air quality in relation to inhalable particulate matter less than 10 microns (PM-io). Approximately 90 percent of these small particles are considered to be dust. Existing dust control regulations by local agencies, municipal departments, public works department, and public health departments are in place in some regions within California. Many local agencies require dust control in order to comply with local nuisance laws, opacity laws (visibility impairment) and the requirements of the Clean Air Act. The following are measures that local agencies inay have already implemented as requirements for dust control from contractors: • Construction and Grading Permits: Require provisions for dust control plans. • Opacity Emission Limits: Enforce compliance with California air pollution control laws. • Increase Overall Enforcement Activities: Priority given to cases involving citizen complaints. • Maintain Field Application Records: Require records of dust control measures from contractor; • Stormwater Pollution Prevention Plan: (SWPPP): Integrate dust control measures into SWPPP. 2 of 5 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Wind Erosion Control WE-1 Dust Control Practices Dust control BMPs generally stabilize exposed surfaces and minimize activities that suspend or track dust particles. The following table shows dust control practices that can be applied to site conditions that cause dust. For heavily traveled and disturbed areas, wet suppression (watering), chemical dust suppression, gravel asphalt surfacing, temporary gravel construction entrances, equipment wash-out areas, and haul truck covers can be employed as dust control applications. Permanent or temporary vegetation and mulching can be employed for areas of occasional or no construction traffic. Preventive measures would include minimizing surface . to be disturbed, limiting onsite vehicle traffic to 15 mph, and controlling the number and areas activity of vehicles on a site at any given time. DUST CONTROIPRACTICES SITE CONDITION Permanent Vegetation Mulctiing Wet Suppression (Watering) Chemical Dust Suppression Gravel or Asphalt Silt Fences Temporary Gravel Construction Entrances/Equipmen' Wash Down Haul Truck Covers Minimize Extent of Disturbed Area Disturbed Areas not Subject to Traffic X X X X X X Disturbed Areas Subject to Traffic X X X X X Materel Stock Pile Stabilization X X X X Demolition X x X Clearing/ Excavation x X X X Truck Traffic on Unpaved Roads X X X x X Mud/Dirt Carry Out X X Additional preventive measures include: • Schedule construction activities to minimize exposed area (EC-i, Scheduling). • Quickly stabilize e.xposed soils using vegetation, mulching, spray-on adhesives, calcium chloride, sprinkling, and stone/gravel layering. • Identify and stabilize key access points prior to commencement of construction. • Minimize the impact of dust by anticipating the direction of prevailing winds. D Direct most construction traffic to stabilized roadways within the project site. • Water should be applied by means of pressure-type distributors or pipelines equipped with a spray system or hoses and nozzles that will ensure even distribution. • All distribution equipment should be equipped with a positive means of shutoff. • Unless water is applied by means of pipelines, at least one mobile unit should be available at all times to apply water or dust palliative to the project. January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 3 of 5 WE-1 Wind Erosion Control • If reclaimed waste water is used, the sources and discharge must meet California Department of Health Services water reclamation criteria and the Regional Water Quality Control Board requirements. Non-potable water should not be conveyed in tanks or drain pipes that will be used to convey potable water and there should be no connection between potable and non-potable supplies. Non-potable tanks, pipes, and other conveyances should be marked, "NON-POTABLE WATER - DO NOT DRINK." • Materials applied as temporary soil stabilizers and soil binders also generally provide wind erosion control benefits. • Pave or chemically stabilize access points where unpaved traffic surfaces adjoin paved roads. • Provide covers for haul trucks transporting materials that contribute to dust. • Provide for wet suppression or chemical stabilization of exposed soils. • Provide for rapid clean up of sediments deposited on paved roads. Furnish stabilized construction road entrances and vehicle wash down areas. • Stabilize inactive construction sites using vegetation or chemical stabilization methods. • Limit the amount of areas disturbed by clearing and earth moving operations by scheduling these activities in phases. For chemical stabilization, there are many products available for chemically stabilizing gravel roadways and stockpiles. If chemical stabilization is used, the chemicals should not create any adverse effects on stormwater, plant life, or groundwater. Costs Installation costs for water and chemical dust suppression are low, but annual costs may be quite high since these measures are effective for only a few hours to a few days. Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly during the rainy season and at two-week intervals in the non-rainy season to verify continued BMP implementation. • Check areas protected to ensure coverage. • Most dust control measures require frequent, often daily, or multiple times per day attention. References Best Management Practices and Erosion Control Manual for Construction Sites, Flood Control District of Maricopa County, Arizona, September 1992. California Air Pollution Control Laws, California Air Resources Board, 1992. 4 of 5 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Wind Erosion Control WE-1 Caltrans, Standard Specifications, Sections lO, "Dust Control"; Section 17, "Watering"; and Section 18, "Dust Palliative". Prospects for Attaining the State Ambient Air Quality Standards for Suspended Particulate Matter (PMio), Visibility Reducing Particles, Sulfates, Lead, and Hydrogen Sulfide, California Air Resources Board, April 1991. Stormwater Quality Handbooks Construction Site Best Management Practices (BMPs) Manual, State of California Depaitment of Transportation (Caltrans), November 2000. Januar/ 2003 California Stormwater BMP Handbook 5 of 5 Construction www.cabmphandbooks.com Material Delivery and Storage WM-1 Description and Purpose Prevent, reduce, or eliminate the discharge of pollutants from material delivery and storage to the stormwater system or watercourses by minimizing the storage of hazardous materials onsite, storing materials in a designated area, installing secondary containment, conducting regular inspections, and training employees and subcontractors. This best management practice covers only material delivery and storage. For other information on materials, see WM-2, Material Use, or WM-4, Spill Prevention and Control. For information on wastes, see the waste management BMPs in this section. Suitable Applications These procedures are suitable for use at all construction sites with delivery and storage of the following materials: • Soil stabilizers and binders • Pesticides and herbicides • Fertilizers Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • Potential Alternatives None Detergents Plaster Petroleum products such as fuel, oil, and grease Asphalt and concrete components QA * ''^•Sisi^ California ^»Ai5. Stormwater Quaiity Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 5 WM-1 Material Delivery and Storage • Hazardous chemicals such as acids, lime, glues, adhesives, paints, solvents, and curing compounds • Concrete compounds • Other materials that may be detrimental if released to the environment Limitations • Space limitation may preclude indoor storage. • Storage sheds often must meet building and fire code requirements. Implementation The following steps should be taken to minimize risk: • Temporary storage area should be located away from vehicular traffic. • Material Safety Data Sheets (MSDS) should be supplied for all materials stored. • Construction site areas should be designated for material delivery and storage. • Material delivery and storage areas should be located near the construction entrances, away from waterways, if possible. Avoid transport near drainage paths or waterways. Surround with earth berms. See EC-9, Earth Dikes and Drainage Swales. Place in an area which will be paved. • Storage of reactive, ignitable, or flammable liquids must comply with the fire codes of your area. Contact the local Fire Marshal to review site materials, quantities, and proposed storage area to determine specific requirements. See the Flammable and Combustible Liquid Code, NFPA30. • An up to date inventory of materials delivered and stored onsite should be kept. • Hazardous materials storage onsite should be minimized. • Hazardous materials should be handled as infrequently as possible. • During the rainy season, consider storing materials in a covered area. Store materials in secondary containments such as earthen dike, horse trough, or even a children's wading pool for non-reactive materials such as detergents, oil, grease, and paints. Small amounts of material may be secondarily contained in "bus boy" trays or concrete mixing trays. • Do not store chemicals, drums, or bagged materials directly on the ground. Place these items on a pallet and, when possible, in secondaiy containment. 2 of 5 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Material Delivery and Storage WM-1 • If drums must be kept uncovered, store them at a slight angle to reduce ponding of rainwater on the lids to reduce corrosion. Domed plastic covers are inexpensive and snap to the top of drums, preventing water from collecting. • Chemicals should be kept in their original labeled containers. • Employees and subcontractors should be trained on the proper material delivery and storage practices. • Employees trained in emergency spill cleanup procedures must be present when dangerous materials or liquid chemicals are unloaded. • If significant residual materials remain on the ground after construction is complete, properly remove materials and any contaminated soil. See WM-7, Contaminated Soil Management. If the area is to be paved, pave as soon as materials are removed to stabilize the soil. Material Storage Areas and Practices m Liquids, petroleum products, and substances listed in 40 CFR Parts 110,117, or 302 should be stored in approved containers and drums and should not be overfilled. Containers and drums should be placed in temporary containment facilities for storage. • A temporary containment facility should provide for a spill containment volume able to contain precipitation from a 25 year storm event, plus the greater of 10% ofthe aggregate volume of all containers or 100% of the capacity ofthe largest container within its boundary, whichever is greater. • A temporary containment facility should be impervious to the materials stored therein for a minimum contact time of 72 hours. • A temporary containment facility should be maintained free of accumulated rainwater and spills. In the event of spills or leaks, accumulated rainwater and spills should be collected and placed into drums. These liquids should be handled as a hazardous waste unless testing determines them to be non-hazardous. All collected hquids or non-hazardous liquids should be sent to an approved disposal site. • Sufficient separation should be provided between stored containers to allow for spill cleanup and emergency response access. • Incompatible materials, such as chlorine and ammonia, should not be stored in the same temporary containment facility. • Throughout the rainy season, each temporary containment facility should be covered during non-working days, prior to, and during rain events. • Materials should be stored in their original containers and the original product labels should be maintained in place in a legible condition. Damaged or otherwise illegible labels should be replaced immediately. January 2003 California Stormwater BMP Handbook 3 of 5 Construction www.cabmphandbooks.com WM-1 Material Delivery and Storage • Bagged and boxed materials should be stored on pallets and should not be allowed to accumulate on the ground. To provide protection from wind and rain throughout the rainy season, bagged and boxed materials should be covered during non-working days and prior to and during rain events. • Stockpiles should be protected in accordance with WM-3, Stockpile Management. • Materials should be stored indoors within existing structures or sheds when available. • Proper storage instructions should be posted at all times in an open and conspicuous location. • An ample supply of appropriate spill clean up material should be kept near storage areas. • Also see WM-6, Hazardous Waste Management, for storing of hazardous materials. Material Delivery Practices • Keep an accurate, up-to-date inventory of material delivered and stored onsite. • Arrange for employees trained in emergency spill cleanup procedures to be present when dangerous materials or liquid chemicals are unloaded. SpiZZ Cleanup • Contain and clean up any spill immediately. • Properly remove and dispose of any hazardous materials or contaminated soil if significant residual materials remain on the ground after construction is complete. See WM-7, Contaminated Soil Management. • See WM-4, Spill Prevention and Control, for spills of chemicals and/or hazardous materials. Cost • The largest cost of implementation may be in the construction of a materials storage area that is covered and provides secondary containment. Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly during the rainy season and of two-week intervals in the non-rainy season to verify continued BMP implementation. • Keep an ample supply of spill cleanup materials near the storage area. • Keep storage areas clean, well organized, and equipped with ample cleanup supplies as appropriate for the materials being stored. • Repair or replace perimeter controls, containment structures, covers, and liners as needed to maintain proper function. 4 of 5 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Material Delivery and Storage WM-1 References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater Pollution from Construction Related Activities; Santa Clara Valley Nonpoint Source Pollution Control Program, 1995- Coastal Nonpoint Pollution Control Program: Program Development and Approval Guidance, Working Group Working Paper; USEPA, April 1992. Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities; Developing Pollution Prevention Plans and Best Management Practice, EPA 832-R-92005; USEPA, April 1992. January 2003 California Stormwater BMP Handbook 5 of 5 Construction www.cabmphandbooks.com Material Use WM-2 Description and Purpose Prevent or reduce the discharge of pollutants to the storm drain system or watercourses from material use by using alternative products, minimizing hazardous material use onsite, and training employees and subcontractors. Suitable Applications This BMP is suitable for use at all construction projects. These procedures apply when the following materials are used or prepared onsite: • Pesticides and herbicides • Fertilizers • Detergents • Plaster • Petroleum products such as fuel, oil, and grease • Asphalt and other concrete components • Other hazardous chemicals such as acids, lime, glues, adhesives, paints, solvents, and curing compounds • Concrete compounds • Other materials that may be detrimental if released to the environment Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Poilution Control Legend: ^ Primary Objective / Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • • • Potential Alternatives None C A S Q A California Stormwater Quaiity Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 WM-2 Material Use Limitations Safer alternative building and construction products may not be available or suitable in every instance. Implementation The following steps should be taken to minimize risk: • Minimize use of hazardous materials onsite. • • Follow manufacturer instructions regarding uses, protective equipment, ventilation, flammability, and mixing of chemicals. Train personnel who use pesticides. The California Department of Pesticide Regulation and county agricultural commissioners license pesticide dealers, certify pesticide applicators, and conduct onsite inspections. Do not over-apply fertilizers, herbicides, and pesticides. Prepare only the amount needed. Follow the recommended usage instructions. Over-application is expensive and environmentally harmful. Unless on steep slopes, till fertilizers into the soil rather than hydro seeding. Apply surface dressings in several smaller applications, as opposed to one large application, to allow time for infiltration and to avoid excess material being carried offsite by runoff. Do not apply these chemicals just before it rains. Train employees and subcontractors in proper material use. Supply Material Safety Data Sheets (MSDS) for all materials. Dispose of latex paint and paint cans, used brushes, rags, absorbent materials, and drop cloths, when thoroughly dry and are no longer hazardous, with other construction debris. Do not remove the original product label; it contains important safety and disposal information. Use the entire product before disposing of the container. Mix paint indoors or in a containment area. Never clean paintbrushes or rinse paint containers into a street, gutter, storm drain, or watercourse. Dispose of any paint thinners, residue, and sludge(s) that cannot be recycled, as hazardous waste. For water-based paint, clean brushes to the extent practicable, and rinse to a drain leading to a sanitary sewer where permitted, or into a concrete washout pit or temporary sediment trap. For oil-based paints, clean brushes to the extent practicable, and filter and reuse thinners and solvents. Use recycled and less hazardous products when practical. Recycle residual paints, solvents, non-treated lumber, and other materials. Use materials only where and when needed to complete the construction activity. Use safer alternative materials as much as possible. Reduce or eliminate use of hazardous materials onsite when practical. 2 of 3 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Material Use WM-2 • Require contractors to complete the "Report of Chemical Spray Forms" when spraying herbicides and pesticides. • Keep an ample supply of spill clean up material near use areas. Train employees in spill clean up procedures. • Avoid exposing applied materials to rainfall and runoff unless sufficient time has been allowed for them to dty. Costs All of the above are low cost measures. Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly during the rainy season and at two-week intervals in the non-rainy season to verify continued BMP implementation. • Maintenance of this best management practice is minimal. • Spot check employees and subcontractors throughout the job to ensure appropriate practices are being employed. References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater Pollution from Construction Related Activities; Santa Clara Valley Nonpoint Source Pollution Control Program, 1995- Coastal Nonpoint Pollution Control Program: Program Development and Approval Guidance, Working Group Working Paper; USEPA, April 1992. Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities; Developing Pollution Prevention Plans and Best Management Practice, EPA 832-R-92005; USEPA, April 1992. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbooks.com stockpile Management WM-3 Description and Purpose Stockpile Management procedures and practices are designed to reduce or eliminate air and stormwater pollution from stockpiles of soil, paving materials such as portland cement concrete (PCC) rubble, asphalt concrete (AC), asphalt concrete rubble, aggregate base, aggregate sub base or pre-mixed aggregate, asphalt minder (so called "cold mix" asphalt), and pressure treated wood. Suitable Applications Implement in all projects that stockpile soil and other materials. Limitations None identified. Implementation Protection of stockpiles is a year-round requirement. To properly manage stockpiles: • Locate stockpiles a minimum of 50 ft away from concentrated flows of stormwater, drainage courses, and inlets. a Protect all stockpiles from stormwater runon using a temporaty perimeter sediment barrier such as berms, dikes, fiber rolls, silt fences, sandbag, gravel bags, or straw bale barriers. Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control • Legend: •/ Primary Objective J Secondary Objective Targeted Constituents Sediment Nutrients Trash Melals Bacteria Oil and Grease Organics Potential Alternatives None CASQA California Stormwater Quality > Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 WM-3 Stockpile Management • Implement wind erosion control practices as appropriate on all stockpiled material. For specific information, see WE-i, Wind Erosion Control. • Manage stockpiles of contaminated soil in accordance with WM-7, Contaminated Soil Management. • Place bagged materials on pallets and under cover. Protection of Non-Active Stockpiles Non-active stockpiles of the identified materials should be protected further as follows: Soil stockpiles • During the rainy season, soil stockpiles should be covered or protected with soil stabilization measures and a temporary perimeter sediment barrier at all times. • During the non-rainy season, soil stockpiles should be covered or protected with a temporary perimeter sediment barrier prior to the onset of precipitation. Stockpiles of Portland cement concrete rubble, asphalt concrete, asphalt concrete rubble, aggregate base, or aggregate sub base • During the rainy season, the stockpiles should be covered or protected with a temporary perimeter sediment barrier at all times. • During the non-rainy season, the stockpiles should be covered or protected with a temporaty perimeter sediment barrier prior to the onset of precipitation. Stockpiles of "cold mix" • During the rainy season, cold mix stockpiles should be placed on and covered with plastic or comparable material at all times. H During the non-rainy season, cold mix stockpiles should be placed on and covered v\ith plastic or comparable material prior to the onset of precipitation. Stockpiles/Storage of pressure treated wood with copper, chromium, and arsenic or ammonical, copper, zinc, and arsenate • During the rainy season, treated wood should be covered with plastic or comparable material at all times. • During the non-rainy season, treated wood should be covered with plastic or comparable material at all times and cold mix stockpiles should be placed on and covered with plastic or comparable material prior to the onset of precipitation. Protection of Active Stockpiles Active stockpiles of the identified materials should be protected further as follows: • All stockpiles should be protected with a temporary linear sediment barrier prior to the onset of precipitation. • Stockpiles of "cold mix" should be placed on and covered with plastic or comparable material prior to the onset of precipitation. 2 of 3 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Stockpile Management WM-3 Costs All of the above are low cost measures. Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly during the rainy season and of two-week intervals in the non-rainy season to verify continued BMP implementation • Repair and/or replace perimeter controls and covers as needed to keep them functioning properly. References Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbooks.com Spill Prevention and Control WM-4 Description and Purpose Prevent or reduce the discharge of pollutants to drainage systems or watercourses from leaks and spills by reducing the chance for spills, stopping the source of spills, containing and cleaning up spills, properly disposing of spill materials, and training employees. This best management practice covers only spill prevention and control. However, WM-i, Materials Delivety and Storage, and WM-2, Material Use, also contain useful information, particularly on spill prevention. For information on wastes, see the waste management BMPs in this section. Suitable Applications This BMP is suitable for all construction projects. Spill control procedures are implemented anytime chemicals or hazardous substances are stored on the construction site, including the following materials: • Soil stabilizers/binders • Dust palliatives • Herbicides • Growth inhibitors • Fertilizers • Deicing/anti-icing chemicals Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics / / • / / Potential Alternatives None CASQA California Stormwater Quaiity Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 6 Spill Prevention and Control WM-4 • Fuels • Lubricants • Other petroleum distillates Limitations • In some cases it may be necessaty to use a private spill cleanup company. • This BMP applies to spills caused by the contractor and subcontractors. . Procedures and practices presented in this BMP are general. Contractor should identify appropriate practices for the specific materials used or stored onsite Implementation The following steps will help reduce the stormwater impacts of leaks and spills: Education m Be aware that different materials pollute in different amounts. Make sure that each employee knows what a "significant spill" is for each material they use, and what is the appropriate response for "significant" and "insignificant" spills. • Educate employees and subcontractors on potential dangers to humans and the environment from spills and leaks. . Hold regular meetings to discuss and reinforce appropriate disposal procedures (incorporate into regular safety meetings). . Establish a continuing education program to indoctrinate new employees. • Have contractor's superintendent or representative oversee and enforce proper spill prevention and control measures. General Measures m To the extent that the work can be accomplished safefy, spills of oil, petroleum products, substances listed under 40 CFR parts 110,117, and 302, and sanitaty and septic wastes should be contained and cleaned up immediately. . Store hazardous materials and wastes in covered containers and protect from vandalism. . Place a stockpile of spill cleanup materials where it will be readify accessible. • Train employees in spill prevention and cleanup. . Designate responsible individuals to oversee and enforce control measures. . Spills should be covered and protected from stormwater runon during rainfall to the extent that it doesn't compromise clean up activities. • Do not buty or wash spills with water. 2 of 6 California Stormwater BMP Handbook Construction www.cabmphandbooks.com Spill Prevention and Control WM-4 • Store and dispose of used clean up materials, contaminated materials, and recovered spill material that is no longer suitable for the intended purpose in conformance with the provisions in applicable BMPs. • Do not allow water used for cleaning and decontamination to enter storm drains or watercourses. Collect and dispose of contaminated water in accordance with WM-io, Liquid Waste Management. • Contain water overflow or minor water spillage and do not allow it to discharge into drainage facilities or watercourses. • Place proper storage, cleanup, and spill reporting instructions for hazardous materials stored or used on the project site in an open, conspicuous, and accessible location. • Keep waste storage areas clean, well organized, and equipped wifh ample cleanup suppUes as appropriate for the materials being stored. Perimeter controls, containment structures, covers, and liners should be repaired or replaced as needed to maintain proper function. Cleanup • Clean up leaks and spills immediately. • Use a rag for small spills on paved surfaces, a damp mop for general cleanup, and absorbent material for larger spills. If the spilled material is hazardous, then the used cleanup materials are also hazardous and must be sent to either a certified laundty (rags) or disposed of as hazardous waste. • Never hose down or buty dty' material spills. Clean up as much of the material as possible and dispose of properly. See the waste management BMPs in this section for specific information. Minor Spills m Minor spills typically involve small quantities of oil, gasoline, paint, etc. which can be controlled by the first responder at the discovety of the spill. • Use absorbent materials on small spills rather than hosing down or burying the spill. • Absorbent materials should be promptly removed and disposed of properly. • Follow the practice below for a minor spill: Contain the spread of the spill. Recover spilled materials. - Clean the contaminated area and properly dispose of contaminated materials. Semi-Significant Spills m Semi-significant spills still can be controlled by the first responder along with the aid of other personnel such as laborers and the foreman, etc. This response may require the cessation of all other activities. January 2003 California Stormwater BMP Handbook 3 of 6 Construction www.cabmphandbooks.com Spill Prevention and Control WM-4 Vehicle and Equipment Maintenance • If maintenance must occur onsite, use a designated area and a secondaty containment, located away from drainage courses, to prevent the runon of stormwater and the runoff of spills. • Regularly inspect onsite vehicles and equipment for leaks and repair immediately • Check incoming vehicles and equipment (including delivety trucks, and employee and subcontractor vehicles) for leaking oil and fluids. Do not allow leaking vehicles or equipment onsite. • Always use secondaty containment, such as a drain pan or drop cloth, to catch spills or leaks when removing or changing fluids. • Place drip pans or absorbent materials under paving equipment when not in use. • Use absorbent materials on small spills rather than hosing down or burying the spill. Remove the absorbent materials promptly and dispose of properly. • Promptly transfer used fluids to the proper waste or recycling drums. Don't leave full drip pans or other open containers lying around • Oil filters disposed of in trashcans or dumpsters can leak oil and pollute stormwater. Place the oil filter in a funnel over a waste oil-recycling drum to drain excess oil before disposal. Oil filters can also be recycled. Ask the oil supplier or recycler about recycling oil filters. • Store cracked batteries in a non-leaking secondaty container. Do this with all cracked batteries even if you think all the acid has drained out. If you drop a battety, treat it as if it is cracked. Put it into the containment area until you are sure it is not leaking. Vehicle and Equipment Fueling u If fueling must occur onsite, use designate areas, located away from drainage courses, to prevent the runon of stormwater and the runoff of spills. • Discourage "topping off' of fuel tanks. • Always use secondary containment, such as a drain pan, when fueling to catch spills/ leaks. Costs Prevention of leaks and spills is ine.xpensive. Treatment and/ or disposal of contaminated soil or water can be quite e.xpensive. Inspection and Maintenance • Inspect and verify- that activity'-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly during the rainy season and of two-week intervals in the non-rainy season to verify' continued BMP implementation. • Inspect BMPs subject to non-stormwater discharge daily while non-stormwater discharges occur. January 2003 California Stormwater BMP Handbook 5 of 6 Construction www.cabmphandbooks.com Solid Waste Management WM-5 Description and Purpose Solid waste management procedures and practices are designed to prevent or reduce the discharge of pollutants to stormwater from solid or construction waste by providing designated waste collection areas and containers, arranging for regular disposal, and training employees and subcontractors. Suitable Applications This BMP is suitable for construction sites where the following wastes are generated or stored: • Solid waste generated from trees and shrubs removed during land clearing, demolition of existing structures (rubble), and building construction • Packaging materials including wood, paper, and plastic • Scrap or surplus building materials including scrap metals, rubber, plastic, glass pieces and masonry products • Domestic wastes including food containers such as beverage cans, coffee cups, paper bags, plastic wrappers, and cigarettes • Construction wastes including brick, mortar, timber, steel and metal scraps, pipe and electrical cuttings, non- hazardous equipment parts, styrofoam and other materials used to transport and package construction materials Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Controi Legend: ^ Primary Objective / Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • • • • Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 4 Solid Waste Management WM-5 • Hold regular meetings to discuss and reinforce disposal procedures (incorporate into regular safety meetings). • Require that employees and subcontractors follow solid waste handling and storage procedures. • Prohibit littering by employees, subcontractors, and visitors. • Minimize production of solid waste materials wherever possible. Collection, Storage, and Disposal m Littering on the project site should be prohibited. • To prevent clogging of the storm drainage system, litter and debris removal from drainage grates, trash racks, and ditch Unes should be a priority. • Trash receptacles should be provided in the contractor's yard, field trailer areas, and at locations where workers congregate for lunch and break periods. • Litter from work areas within the construction limits of the project site should be coUected and placed in watertight dumpsters at least weekly, regardless of whether the litter was generated by the contractor, the public, or others. Collected litter and debris should not be placed in or next to drain inlets, stormwater drainage systems, or watercourses. • Dumpsters of sufficient size and number should be provided to contain the solid waste generated by the project. • Full dumpsters should be removed from the project site and the contents should be disposed of by the trash hauling contractor. • Construction debris and waste should be removed from the site biweekly or more frequently as needed. • Construction material visible to the pubUc should be stored or stacked in an orderly manner. • Stormwater runon should be prevented from contacting stored solid waste through the use of berms, dikes, or other temporaty diversion structures or through the use of measures to elevate waste from site surfaces. • Solid waste storage areas should be located at least 50 ft from drainage facilities and watercourses and should not be located in areas prone to flooding or ponding. • Except during fair weather, construction and highway planting waste not stored in watertight dumpsters should be securely covered from wind and rain by covering the waste with tarps or plastic. • Segregate potentially hazardous waste from non-hazardous construction site waste. • Make sure that toxic Uquid wastes (used oils, solvents, and paints) and chemicals (acids, pesticides, additives, curing compounds) are not disposed of in dumpsters designated for construction debris. January 2003 California Stormwater BMP Handbook 3 of 4 Construction www.cabmphandbooks.com Hazardous Waste Management WM-6 Description and Purpose Prevent or reduce the discharge of poUutants to stormwater from hazardous waste through proper material use, waste disposal, and training of employees and subcontractors. Suitable Applications This best management practice (BMP) applies to aU construction projects. Hazardous waste management practices are implemented on construction projects that generate waste from the use of: - Petroleum Products - Concrete Curing Compounds - Palliatives - Septic Wastes - Stains - 'Wood Preservatives - Asphalt Products - Pesticides - Acids - Paints - Solvents - Roofing Tar - Any materials deemed a hazardous waste in California, Title 22 Division 4.5, or listed in 40 CFR Parts 110,117, 261, or 302 Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective • Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • • • • • Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 6 Hazardous Waste Management WM-6 - Incompatible materials, such as chlorine and ammonia, should not be stored in the same temporaty containment facility. - Throughout the rainy season, temporaty containment facilities should be covered during non-working days, and prior to rain events. Covered facilities may include use of plastic tarps for small faciUties or constructed roofs with overhangs. • Drums should not be overfilled and wastes should not be mbced. • Unless watertight, containers of dty waste should be stored on paUets. • Do not over-apply herbicides and pesticides. Prepare only the amount needed. FoUow the recommended usage instructions. Over application is expensive and environmentally harmful. Apply surface dressings in several smaUer applications, as opposed to one large application. Allow time for infiltration and avoid excess material being carried offsite by runoff. Do not apply these chemicals just before it rains. People applying pesticides must be certified in accordance with federal and state regulations. • Paint brushes and equipment for water and oU based paints should be cleaned within a contained area and should not be aUowed to contaminate site soUs, watercourses, or drainage systems. Waste paints, thinners, solvents, residues, and sludges that cannot be recycled or reused should be disposed of as hazardous waste. When thoroughly dty, latex paint and paint cans, used brushes, rags, absorbent materials, and drop cloths should be disposed of as solid waste. • Do not clean out brushes or rinse paint containers into the dirt, street, gutter, storm drain, or stream. "Paint out" brushes as much as possible. Rinse water-based paints to the sanitaty' sewer. Filter and reuse thinners and solvents. Dispose of excess oU-based paints and sludge as hazardous waste. • The foUowing actions should be taken with respect to temporaty contaminant: - Ensure that adequate hazardous waste storage volume is available. - Ensure that hazardous waste coUection containers are conveniently located. - Designate hazardous waste storage areas onsite away from storm drains or watercourses and away from moving vehicles and equipment to prevent accidental spiUs. - Minimize production or generation of hazardous materials and hazardous waste on the job site. - Use containment berms in fueling and maintenance areas and where the potential for spiUs is high. - Segregate potentially hazardous waste from non-hazardous construction site debris. - Keep liquid or semi-liquid hazardous waste in appropriate containers (closed drums or simUar) and under cover. January 2003 California Stormwater BMP Handbook 3 of 6 Construction www.cabmphandbooks.com Hazardous Waste Management WM-6 Education • Educate employees and subcontractors on hazardous waste storage and disposal procedures. • Educate employees and subcontractors on potential dangers to humans and the environment from hazardous wastes. • Instruct employees and subcontractors on safety procedures for common construction site hazardous wastes. • Instruct employees and subcontractors in identification of hazardous and solid waste. • Hold regular meetings to discuss and reinforce hazardous waste management procedures (incorporate into regular safety meetings). • The contractor's superintendent or representative should oversee and enforce proper hazardous waste management procedures and practices. • Make sure that hazardous waste is coUected, removed, and disposed of only at authorized disposal areas. • Waming signs should be placed in areas recently treated with chemicals. • Place a stockpile of spiU cleanup materials where it will be readily accessible. • If a container does spUl, clean up immediately. Costs All of the above are low cost measures. Inspection and Maintenance m Inspect and verify that activity'-based BMPs are in place prior to the commencement of associated activities. WhUe activities associated with the BMP are under way, inspect weekly during the rainy season and of two week intervals in the non-rainy season to verify continued BMP implementation. • Inspect BMPs subject to non-stormwater discharge daily whUe non-stormwater discharges occur • Hazardous waste should be regularly coUected. • A foreman or construction supervisor should monitor onsite hazardous waste storage and disposal procedures. • Waste storage areas should be kept clean, weU organized, and equipped with ample cleanup supplies as appropriate for the materials being stored. • Perimeter controls, containment structures, covers, and liners should be repaired or replaced as needed to maintain proper function. • Hazardous spiUs should be cleaned up and reported in conformance with the applicable Material Safety' Data Sheet (MSDS) and the instructions posted at the project site. January 2003 California Stormwater BMP Handbook 5 of 6 Construction www.cabmphandbooks.com Contaminated Soil Management WM-7 Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective J Secondary Objective Description and Purpose Prevent or reduce the discharge of pollutants to stormwater from contaminated soU and highly acidic or alkaline soUs by conducting pre-construction surveys, inspecting excavations regularly, and remediating contaminated soil promptiy. Suitable Applications Contaminated soU management is implemented on construction projects in highly urbanized or industrial areas where soU contamination may have occurred due to spiUs, Ulicit discharges, aerial deposition, past use and leaks from underground storage tanks. Limitations Contaminated soUs that cannot be treated onsite must be disposed of offsite by a licensed hazardous waste hauler. The presence of contaminated soU may indicate contaminated water as weU. See NS-2, Dewatering Operations, for more information. The procedures and practices presented in this BMP are general. The contractor should identify appropriate practices and procedures for the specific contaminants known to exist or discovered onsite. Implementation Most owners and developers conduct pre-construction environmental assessments as a matter of routine. Contaminated soils are often identified during project planning and development with known locations identified in the plans, specifications and in the SWPPP. The contractor should review applicable reports and investigate appropriate call-outs in the plans, specifications, and Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • • • • • Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 5 Contaminated Soil Management WM-7 • Quality should be monitored during excavation of soils contaminated with lead. Handling Procedures for Contaminated Soils • Minimize onsite storage. Contaminated soU should be disposed of properly in accordance with all applicable regulations. AU hazardous waste storage wiU comply with the requirements in Title 22, CCR, Sections 66265.250 to 66265.260. • Test suspected soils at an approved certified laboratoty. • Work with the local regulatoty agencies to develop options for treatment or disposal if the soU is contaminated. • Avoid temporaty stockpUing of contaminated soils or hazardous material. • Take the following precautions if temporaty stockpUing is necessaty: Cover the stockpile with plastic sheeting or tarps. Install a berm around the stockpUe to prevent runoff from leaving the area. Do not StockpUe in or near storm drains or watercourses. • Remove contaminated material and hazardous material on exteriors of transport vehicles and place either into the current transport vehicle or into the excavation prior to the vehicle leaving the exclusion zone. • Monitor the air quality continuously during excavation operations at all locations containing hazardous material. • Procure all permits and licenses, pay all charges and fees, and give all notices necessaty and incident to the due and lawful prosecution of the work, including registration for transporting vehicles carrying the contaminated material and the hazardous material. • Collect water from decontamination procedures and treat or dispose of it at an appropriate disposal site. • CoUect non-reusable protective equipment, once used by any personnel, and dispose of at an appropriate disposal site. • Install temporaty security fence to surround and secure the exclusion zone. Remove fencing when no longer needed. • Excavate, transport, and dispose of contaminated material and hazardous material in accordance with the rules and regulations of the foUowing agencies (the specifications of these agencies supersede the procedures outlined in this BMP): - United States Department of Transportation (USDOT) - United States Environmental Protection Agency (USEPA) - California Environmental Protection Agency (CAL-EPA) January 2003 California Stormwater BMP Handbook 3 of 5 Construction www.cabmphandbooks.com Contaminated Soil Management WM-7 • Implement WM-4, SpUl Prevention and Control, to prevent leaks and spiUs as much as possible. References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater Pollution from Construction Related Activities; Santa Clara Valley Nonpoint Source PoUution Control Program, 1995- Processes, Procedures and Methods to Control Pollution Resulting from All Construction Activity, 430/9-73-007, USEPA, 1973. Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities; Developing PoUution Prevention Plans and Best Management Practice, EPA 832-R-92005; USEPA, April 1992. January 2003 California Stormwater BMP Handbook 5 of 5 Construction www.cabmphandbooks.com Concrete Waste Management WM-8 CONCRETE WASHOUT AREA Description and Purpose Prevent or reduce the discharge of pollutants to stormwater from concrete waste by conducting washout offsite, performing onsite washout in a designated area, and training employee and subcontractors. Suitable Applications Concrete waste management procedures and practices are implemented on construction projects where: • Concrete is used as a construction material or where concrete dust and debris result form demolition activities • Slurries containing portland cement concrete (PCC) or asphalt concrete (AC) are generated, such as from saw- cutting, coring, grinding, grooving, and hydro-concrete demolition • Concrete trucks and other concrete-coated equipment are washed onsite • Mortar-mixing stations e.xist • See also NS-8, Vehicle and Equipment Cleaning Limitations • Offsite washout of concrete wastes may not always be possible. Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective y Secondary Objective Targeted Constituents Sediment •/ Nutrients Trash Metals •>/ Bacteria Oil and Grease Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 7 Concrete Waste Management WM-8 • Below grade concrete washout facilities are typical. Above grade facilities are used if excavation is not practical. • A foreman or construction supervisor should monitor onsite concrete working tasks, such as saw cutting, coring, grinding and grooving to ensure proper methods are implemented. • Saw-cut PCC slurty should not be allowed to enter storm drains or watercourses. Residue from grinding operations should be picked up by means of a vacuum attachment to the grinding machine. Saw cutting residue should not be allowed to flow across the pavement and should not be left on the surface of the pavement. See also NS-3, Paving and Grinding Operations; and WM-10, Liquid Waste Management. • Slurty residue should be vacuumed and disposed in a temporaty pit (as described in OnSite Temporaty Concrete Washout FacUity, Concrete Transit Truck Washout Procedures, below) and allowed to dry. Dispose of dty slurty residue in accordance with WM-5, Solid Waste Management. Onsite Temporary Concrete Washout Facility, Transit Truck Washout Procedures u Temporaty concrete washout facilities should be located a minimum of 50 ft from storm drain inlets, open drainage facUities, and watercourses. Each facility should be located away from construction traffic or access areas to prevent disturbance or tracking. • A sign should be installed adjacent to each washout facUity to inform concrete equipment operators to utilize the proper facilities. • Temporaty concrete washout facUities should be constructed above grade or below grade at the option of the contractor. Temporaty concrete washout facilities should be constructed and maintained in sufficient quantity and size to contain all liquid and concrete waste generated by washout operations. • Temporaty washout facilities should have a temporaty pit or bermed areas of sufficient volume to completely contain all liquid and waste concrete materials generated during washout procedures. • Washout of concrete trucks should be performed in designated areas only. • Only concrete from mixer truck chutes should be washed into concrete wash out. • Concrete washout from concrete pumper bins can be washed into concrete pumper trucks and discharged into designated washout area or properly disposed of offsite. • Once concrete wastes are washed into the designated area and allowed to harden, the concrete should be broken up, removed, and disposed of per WM-5, Solid Waste Management. Dispose of hardened concrete on a regular basis. • Temporaty Concrete Washout FacUity (Type Above Grade) - Temporaty' concrete washout facility (type above grade) should be constructed as shown on the detaUs at the end of this BMP, with a recommended minimum length and January 2003 California Stormwater BMP Handbook 3 of 7 Construction www.cabmphandbooks.com Concrete Waste Management WM-8 References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater PoUution from Construction Related Activities; Santa Clara Valley Nonpoint Source Pollution Control Program, 1995- Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities; Developing Pollution Prevention Plans and Best Management Practice, EPA 832-R-92005; USEPA, AprU 1992. January 2003 California Stormwater BMP Handbook 5 of 7 Construction www.cabmphandbooks.com Concrete Waste Management WM-8 10 MIL PLASTIC LINING PLAN MIN NOT TO SCALE TYPE "ABOVE GRADE" WITH STRAW BALES -STAKE (TYP) STI 1/8" E:EL DIA. WIRE STAPLE DETAIL -STRAW BALE (TYP) CONCRETE WASHOU' L^O.5" LAG a-- SCREWS PLYWOOD 48" X 24" -PAINTED WHITE -BLACK LETTERS 6" HEIGHT -WOOD POST 3" X 3" X £ CONCRETE WASHOUT SIGN DETAIL (OR EQUIVALENT) STAPLES (2 PER BALE) NATIVE MATERIAL- (OPTIONAL) 10 MIL PLASTIC LINING WOOD OR METAL STAKES (2 PER BALE) SECTION B-B NOT TO SCALE BINDING WIRE •STRAW BALE NOTES 1. ACTUAL LAYOUT DETERMINED IN FIELD. 2. THE CONCRETE WASHOUT SIGN SHALL BE INSTALLED WITHIN 30 FT. OF THE TEMPORARY CONCRETE WASHOUT FACILITY. January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 7 of 7 Sanitary/Septic Waste Management WM-9 Description and Purpose Proper sanitaty and septic waste management prevent the discharge of poUutants to stormwater from sanitaty and septic waste by providing convenient, weU-maintained facUities, and arranging for regular service and disposal. Suitable Applications Sanitaty septic waste management practices are suitable for use at aU construction sites that use temporaty or portable sanitaty and septic waste systems. Limitations None identified. Implementation Sanitary or septic wastes should be treated or disposed of in accordance with state and local requirements. In many cases, one contract with a local facUity supplier wiU be all that it takes to make sure sanitaty wastes are properly disposed. Storage and Disposal Procedures m Temporaty' sanitary facUities should be located away from drainage facUities, watercourses, and from traffic circulation. When subjected to high winds or risk of high winds, temporaty sanitaty facUities should be secured to prevent overturning. • Wastewater should not be discharged or buried within the project site. Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Conlrol Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: / Primary Objective / Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 Sanitary/Septic Waste Management WM-9 References Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities; Developing PoUution Prevention Plans and Best Management Practice, EPA 832-R-92005; USEPA, April 1992. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbooks.com Concrete Finishing NS-13 Description and Purpose Concrete finishing methods are used for bridge deck rehabUitation, paint removal, curing compound removal, and final surface finish appearances. Methods include sand blasting, shot blasting, grinding, or high pressure water blasting. Stormwater and non-stormwater exposed to concrete finishing by-products may have a high pH and may contain chemicals, metals, and fines. Proper procedures and implementation of appropriate BMPs can minimize the impact that concrete-finishing methods may have on stormwater and non-stormwater discharges. Suitable Applications These procedures apply to aU construction locations where concrete finishing operations are performed. Limitations None identified. Objectives EC Erosion Control SE Sediment Control TC Tracking Control WE Wind Erosion Control NS Non-Stormwater / NS Management Control V WM Waste Management and • WM Materials Pollution Control • Legend: • Primary Objective Secondary Objective Targeted Constituents Sediment i Nutrients Trash Metals ^ Bacteria Oil and Grease Organics ^ Potential Alternatives None Implementation • CoUect and properly dispose of water from high-pressure water blasting operations. • CoUect contaminated water from blasting operations at the top of slopes. Transport or dispose of contaminated water whUe using BMPs such as those for erosion control. Refer to EC-9, Earth Dikes and Drainage Swales, EC-io, Velocity- Dissipation Devices, and EC-ii, Slope Drains. CASQA California Stormwater Quality > Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 2 Material Over Water NS-14 A Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective Description and Purpose Procedures for the proper use, storage, and disposal of materials and equipment on barges, boats, temporaty construction pads, or simUar locations, that minimize or eliminate the discharge of potential poUutants to a watercourse. Suitable Applications Applies where materials and equipment are used on barges, boats, docks, and other platforms over or adjacent to a watercourse including waters of the United States. These procedures should be implemented for construction materials and wastes (solid and liquid), soU or dredging materials, or any other materials that may cause-or contribute to exceedances of water quality standards. Limitations Dredge and fiU activities are regulated by the US Army Corps of Engineers and Regional Boards under Section 404/401 of the Clean Water Act. Implementation • Refer to WM-i, Material Delivety' and Storage and WlVI-4, SpUl Prevention and Control. • Use drip pans and absorbent materials for equipment and vehicles and ensure that an adequate supply of spiU clean up materials is available. • Drip pans should be placed under all vehicles and equipment placed on docks, barges, or other structures over water bodies Targeted Constituents Sediment ^ Nutrients V' Trash ^ Metals ^ Bacteria Oil and Grease ^ Organics ^ Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 Material Over Water NS-14 Stormwater Management for Construction Activities, Developing Pollution Prevention Plans and Best Management Practices, EPA 832-R-92005; USEPA, April 1992. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbooks.com Demolition Adjacent to Water NS-15 mmm Description and Purpose Procedures to protect water bodies from debris and wastes associated with structure demolition or removal over or adjacent to watercourses. Suitable Applications FuU bridge demolition and removal, partial bridge removal (barrier rail, edge of deck) associated with bridge widening projects, concrete channel removal, or any other structure removal that could potentially affect water quality. Limitations None identified. Implementation • Refer to NS-5, Clear Water Diversion, to direct water away from work areas. • Use attachments on construction equipment such as backhoes to catch debris from small demolition operations. • Use covers or platforms to collect debris. • Platforms and covers are to be approved by the owner. • StockpUe accumulated debris and waste generated during demolition away from watercourses and in accordance with WM-3, Stockpile Management. • Ensure safe passage of wildlife, as necessaty. Objectives EC Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stonnwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective SE TC WE NS WM Targeted Constituents Sediment y Nutrients ^ Trash y Metals y Bacteria y Oii and Grease ^ Organics y Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 2 Paving and Grinding Operations NS-3 Description and Purpose Prevent or reduce the discharge of pollutants from paving operations, using measures to prevent runon and runoff poUution, properly disposing of wastes, and training employees and subcontractors. Suitable Applications These procedures are implemented where paving, surfacing, resurfacing, or sawcutting, may pollute stormwater runoff or discharge to the storm drain system or watercourses. Limitations • Finer solids are not effectively removed by filtration systems. • Paving opportunities may be limited during wet weather. Implementation GeneraZ • Avoid paving during the wet season when feasible. • Reschedule paving and grinding activities if rain is in the forecast. • Train employees and sub-contractors in pollution prevention and reduction. • Store materials away from drainage courses to prevent stormwater runon (see WM-i, Material Delivety and Storage). Objectives EC Erosion Control SE Sediment Control TC Tracking Control WE Wind Erosion Control NS Non-Stormwater • NS Management Control • WM Waste Management and WM Materials Pollution Control Legend: y Primary Objective • Secondary Objective Targeted Constituents Sediment t Nutrients Trash Metals Bacteria Oil and Grease < Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 4 NS-3 Paving and Grinding Operations • Protect drainage courses, particularly in areas with a grade, by employing BMPs to divert runoff or to trap and filter sediment. • If paving involves an onsite mixing plant, foUow the stormwater permitting requirements for industrial activities. • Stockpile material removed from roadways away from drain inlets, drainage ditches, and watercourses. These materials should be stored consistent with WM-3, StockpUe Management. • Disposal of PCC and AC waste should be in conformance with WM-8, Concrete Waste Management. Sauj Cutting, Grinding, and Pavement Removal • Shovel or vacuum saw-cut slurty and remove from site. Cover or barricade storm drains during saw cutting to contain slurty. • When paving involves AC, the following steps should be implemented to prevent the discharge of grinding residue, uncompacted or loose AC, tack coats, equipment cleaners, or unrelated paving materials: AC grindings, pieces, or chunks used in embankments or shoulder backing must not be allowed to enter any storm drains or watercourses. Install silt fence untU structure is stabilized or permanent controls are in place. Examples of temporaty perimeter controls can be found in EC-9, Earth Dikes and Drainage Swales; SE-i, Silt Fence; or SE-5, Fiber RoUs. Collect and remove all broken asphalt and recycle when practical. Old or spilled asphalt must be recycled or disposed. Any AC chunks and pieces used in embankments must be placed above the water table and covered by at least 1 ft of material. • Do not aUow saw-cut sluny to enter storm drains or watercourses. Residue from grinding operations should be picked up by means of a vacuum attachment to the grinding machine, should not be allowed to flow across the pavement, and should not be left on the surface of the pavement. See also WM-8, Concrete Waste Management, and WM-10, Liquid Waste Management. • Dig out activities should not be conducted in the rain. B CoUect dig out material by mechanical or manual methods. This material may be recycled for use as shoulder backing or base material. • If dig out material cannot be recycled, transport the material back to an approved storage site. Asphaltic Concrete Paving m If paving involves asphaltic cement concrete, follow these steps: 2 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Paving and Grinding Operations NS-3 - Do not aUow sand or gravel placed over new asphalt to wash into storm drains, streets, or creeks. Vacuum or sweep loose sand and gravel and properly dispose ofthis waste by referring to WM-5, Solid Waste Management. - Old asphalt must be disposed of properly. CoUect and remove all broken asphalt from the site and recycle whenever possible. Portland Cement Concrete Paving m Do not wash sweepings from exposed aggregate concrete into a storm drain system. CoUect and return to aggregate base stockpUe or dispose of properly. • Allow aggregate rinse to settie. Then, either aUow rinse water to dty in a temporaty pit as described in WM-8, Concrete Waste Management, or pump the water to the sanitaty sewer if allowed by the local wastewater authority'. Sealing Operations m During chip seal application and sweeping operations, petroleum or petroleum covered aggregate must not be allowed to enter any storm drain or water courses. Apply temporaty perimeter controls untU structure is stabUized. • Drainage inlet structures and manholes should be covered with filter fabric during application of seal coat, tack coat, slurry seal, and fog seal. . Seal coat, tack coat, slurry seal, or fog seal should not be applied if rainfall is predicted to occur during the application or curing period. Paving Equipment m Leaks and spiUs from paving equipment can contain toxic levels of heavy metals and oil and grease. Place drip pans or absorbent materials under paving equipment when not m use. Clean up spiUs with absorbent materials rather than burying. See NS-10, Vehicle and Equipment Maintenance, WM-4, SpiU Prevention and Control, and WM-10, Liquid Waste Management. • Substances used to coat asphalt transport trucks, and asphalt spreading equipment should not contain soap and should be non-foaming and non-toxic. • Use only non-toxic substances to coat asphalt transport trucks and asphaU spreading equipment. • Paving equipment parked onsite should be parked over plastic to prevent soU contamination. . Clean asphalt coated equipment offsite whenever possible. When cleaning dty, hardened asphah from equipment, manage hardened asphalt debris as described in WM-5, Solid Waste Management. Any cleaning onsite should foUow NS-8, Vehicle and Equipment Cleaning. January 2003 California Stormwater BMP Handbook ^ 0^ ^ Construction www.cabmphandbooks.com NS-3 Paving and Grinding Operations Thermoplastic Striping • Thermoplastic striper and pre-heater equipment shutoff valves should be inspected to ensure that they are working properly to prevent leaking thermoplastic from entering drain inlets, the stormwater drainage system, or watercourses. • Pre-heaters should be fiUed carefully to prevent splashing or spiUing of hot thermoplastic. Leave six inches of space at the top of the pre-heater container when fiUing thermoplastic to aUow room for material to move when the vehicle is deadheaded. • Do not pre-heat, transfer, or load thermoplastic near drain inlets or watercourses. • Clean truck beds daily of loose debris and meUed thermoplastic. When possible, recycle thermoplastic material. Raised/Recessed Pavement Marker Application and Removal u Do not transfer or load bituminous material near drain inlets, the stormwater drainage system, or watercourses. • Melting tanks should be loaded with care and not fiUed to beyond six inches from the top to leave room for splashing when vehicle is deadheaded. • When servicing or fiUing melting tanks, ensure aU pressure is released before removing lids to avoid spills. • On large-scale projects, use mechanical or manual methods to coUect excess bituminous material from the roadway after removal of markers. Costs • AU of the above are low cost measures. Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. WhUe activities associated with the BMP are under way, inspect weekly during the rainy season and at two-week intervals in the non-rainy season to verify continued BMP implementation. • Keep ample supplies of drip pans or absorbent materials onsite. • Inspect and maintain machinery regularly to minimize leaks and drips. References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater PoUution from Construction Related Activities; Santa Clara VaUey Nonpoint Source PoUution Control Program, 1995- Hot Mix Asphalt-Paving Handbook AC 150/5370-14, Appendbc I, U.S. Army Corps of Engineers, July 1991. Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. 4 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabniphandbooks.com Potable Water/Irrigation NS-7 Description and Purpose Potable Water/Irrigation consists of practices and procedures to manage the discharge of potential pollutants generated during discharges from irrigation water lines, landscape irrigation, lawn or garden watering, planned and unplanned discharges from potable water sources, water line flushing, and hydrant flushing. Suitable Applications Implement this BMP whenever potable water or irrigation water discharges occur at or enter a construction site. Limitations None identified. Implementation • Direct water from offsite sources around or through a construction site, where feasible, in a way that minimizes contact with the construction site. • Discharges from water line flushing should be reused for landscaping purposes where feasible. • Shut off the water source to broken lines, sprinklers, or valves as soon as possible to prevent excess water flow. • Protect downstream stormwater drainage systems and watercourses from water pumped or baUed from trenches excavated to repair water lines. Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com NS-7 Potable Water/Irrigation • Inspect irrigated areas within the construction limits for excess watering. Adjust watering times and schedules to ensure that the appropriate amount of water is being used and to minimize runoff. Consider factors such as soil structure, grade, time of year, and type of plant material in determining the proper amounts of water for a specific area. Costs Cost to manage potable water and irrigation are low and generally considered to be a normal part of related activities. Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly duiing the rainy season and at two-week intervals in the non-rainy season to verify continued BMP implementation. • Inspect BMPs subject to non-stormwater discharges daily while non-stormwater discharges occur. • Repair broken water lines as soon as possible. • Inspect irrigated areas regularly for signs of erosion and/or discharge. References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater Pollution from Construction Related Activities; Santa Clara Valley Nonpoint Source Pollution Control Program, 1995- Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities, Developing Pollution Prevention Plans and Best Management Practices, EPA 832-R-92005; USEPA, April 1992. 2 of 2 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Vehicle and Equipment Cleaning NS-8 i VEHICLE WASH AREA Description and Purpose Vehicle and equipment cleaning procedures and practices prevent or reduce the discharge of pollutants to stormwater from vehicle and equipment cleaning by using offsite facilities; washing in designated, contained areas only; eliminating discharges to the storm drain by infiltrating the wash water; and training employees and subcontractors. Suitable Applications These procedures are suitable on all construction sites where vehicle and equipment cleaning is performed. Limitations Even phosphate-free, biodegradable soaps have been shown to be toxic to fish before the soap degrades. Sending vehicles/equipment offsite should be done in conjunction with TC-1, StabUized Construction Entrance/ Exit. Implementation Use an offsite commercial washing business as much as possible. These businesses are better equipped to handle and dispose of the wash waters properly. Performing this work offsite can also be economical by eliminating the need for a separate washing operation onsite. • Use phosphate-free, biodegradable soaps. • Educate employees and subcontractors on pollution prevention m.easures. Objectives Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective Targeted Constituents EC SE TC WE NS WM Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics • Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbook.com 1 of 3 NS-8 Vehicle and Equipment Cleaning • Do not permit steam cleaning onsite. Steam cleaning can generate significant poUutant concentrates. • Cleaning of vehicles and equipment with soap, solvents or steam should not occur on the project site unless resulting wastes are fully contained and disposed of. Resulting wastes should not be discharged or buried, and must be captured and recycled or disposed according to the requirements of WM-io, Liquid Waste Management or WM-6, Hazardous Waste Management, depending on the waste characteristics. Minimize use of solvents. Use of diesel for vehicle and equipment cleaning is prohibited. • All vehicles and equipment that regularly enter and leave the construction site must be cleaned offsite. • When vehicle and equipment washing and cleaning must occur onsite, and the operation cannot be located within a structure or building equipped with appropriate disposal faciUties, the outside cleaning area should have the following characteristics: Located away from storm drain inlets, drainage facUities, or watercourses Paved with concrete or asphalt and bermed to contain wash waters and to prevent runon and runoff Configured with a sump to aUow coUection and disposal of wash water No discharge of wash waters to storm drains or watercourses Used only when necessaty • When cleaning vehicles and equipment with water: - Use as little water as possible. High-pressure sprayers may use less water than a hose and should be considered Use positive shutoff valve to minimize water usage Facility wash racks should discharge to a sanitary sewer, recycle system or other approved discharge system and should not discharge to the storm drainage system, watercourses, or to groundwater Costs Cleaning vehicles and equipment at an offsite facility may reduce overall costs for vehicle and equipment cleaning by eliminating the need to provide simUar services onsite. When onsite cleaning is needed, the cost to establish appropriate facUities is relatively low on larger, long- duration projects, and moderate to high on small, short-duration projects. Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. WhUe activities associated with the BMP are under way, inspect weekly during the rainy season and at two-week intervals in the non-rainy season to verify continued BMP implementation. 2 of 3 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbook.com Vehicle and Equipment Cleaning NS-8 • Inspect BMPs subject to non-stormwater discharges daily while non-stormwater discharges occur. • Inspection and maintenance is minimal, although some berm repair may be necessaty. • Monitor employees and subcontractors throughout the duration of the construction project to ensure appropriate practices are being implemented. • Inspect sump regularly and remove liquids and sediment as needed. • Prohibit employees and subcontractors from washing personal vehicles and equipment on the construction site. References Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Swisher, R.D. Surfactant Biodegradation, Marcel Decker Corporation, 1987. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbook.com Vehicle and Equipment Fueling NS-9 Description and Purpose Vehicle equipment fueling procedures and practices are designed to prevent fuel spiUs and leaks, and reduce or eliminate contamination of stormwater. This can be accomplished by using offsite facilities, fueling in designated areas only, enclosing or covering stored fuel, implementing spiU controls, and training employees and subcontractors in proper fueling procedures. Suitable Applications These procedures are suitable on aU construction sites where vehicle and equipment fueling takes place. Limitations Onsite vehicle and equipment fueling should only be used where it is impractical to send vehicles and equipment offsite for fueling. Sending vehicles and equipment offsite should be done in conjunction with TC-i, Stabilized Construction Entrance/ Exit. Implementation • Use offsite fueling stations as much as possible. These businesses are better equipped to handle fuel and spUls properly. Performing this work offsite can also be economical by eliminating the need for a separate fueling area at a site. • Discourage "topping-off' of fuel tanks. Objectives Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective y Secondary Objective EC SE TC WE NS WM Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease ^ Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 NS-9 Vehicle and Equipment Fueling Absorbent spill cleanup materials and spill kits should be avaUable in fueling areas and on fueling trucks, and should be disposed of properly after use. Drip pans or absorbent pads should be used during vehicle and equipment fueling, unless the fueling is performed over an impermeable surface in a dedicated fueling area. Use absorbent materials on small spiUs. Do not hose down or buty the spill. Remove the adsorbent materials promptly and dispose of properly. Avoid mobUe fueling of mobile construction equipment around the site; rather, transport the equipment to designated fueling areas. With the exception of tracked equipment such as bulldozers and large excavators, most vehicles should be able to travel to a designated area with little lost time. Train employees and subcontractors in proper fueling and cleanup procedures. When fueling must take place onsite, designate an area away from drainage courses to be used. Fueling areas should be identified in the SWPPP. Dedicated fueling areas should be protected from stormwater runon and runoff, and should be located at least 50 ft away from downstream drainage facUities and watercourses. Fueling must be performed on level-grade areas. Protect fueling areas with berms and dikes to prevent runon, runoff, and to contain spiUs. Nozzles used in vehicle and equipment fueling should be equipped with an automatic shutoff to control drips. Fueling operations should not be left unattended. Use vapor recovety nozzles to help control drips as weU as air pollution where required by Air Quality Management Districts (AQMD). Federal, state, and local requirements should be observed for any stationaty above ground storage tanks. Costs All of the above measures are low cost except for the capital costs of above ground tanks that meet all local environmental, zoning, and fire codes. nspection and Maintenance Vehicles and equipment should be inspected each day of use for leaks. Leaks should be repaired immediately or problem vehicles or equipment should be removed from the project site. Keep ample supplies of spUl cleanup materials onsite. Immediately clean up spiUs and properly dispose of contaminated soU and cleanup materials. 2 of 3 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Vehicle and Equipment Fueling NS-9 References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater PoUution from Construction Related Activities; Santa Clara Valley Nonpoint Source Pollution Control Program, 1995- Coastal Nonpoint Pollution Control Program: Program Development and Approval Guidance, Working Group Working Paper; USEPA, April 1992. Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management for Construction Activities, Developing Pollution Prevention Plans and Best Management Practices, EPA 832-R-92005; USEPA, AprU 1992. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbooks.com Vehicle & Equipment Maintenance NS-10 Description and Purpose Prevent or reduce the contamination of stormwater resulting from vehicle and equipment maintenance by running a "dry and clean site". The best option would be to perform maintenance activities at an offsite facUity. If this option is not available then work should be performed in designated areas only, whUe providing cover for materials stored outside, checking for leaks and spills, and containing and cleaning up spiUs immediately. Employees and subcontractors must be trained in proper procedures. Suitable Applications These procedures are suitable on aU construction projects where an onsite yard area is necessary for storage and maintenance of heavy equipment and vehicles. Limitations Onsite vehicle and equipment maintenance should only be used where it is impractical to send vehicles and equipment offsite for maintenance and repair. Sending vehicles/equipment offsite should be done in conjunction with TC-l, Stabilized Construction Entrance/Exit. Outdoor vehicle or equipment maintenance is a potentially significant source of stormwater pollution. Activities that can contaminate stormwater include engine repair and service, changing or replacement of fluids, and outdoor equipment storage and parking (engine fluid leaks). For ftirther information on vehicle or equipment servicing, see NS-8, Vehicle and Equipment Cleaning, and NS-9, Vehicle and Equipment Fueling. Objectives Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective EC SE TC WE NS WM • Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives None ASQ A California Stormwater r??,^^ Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 4 NS-10 Vehicle & Equipment Maintenance Implementation Use offsite repair shops as much as possible. These businesses are better equipped to handle vehicle fluids and spiUs properly. Performing this work offsite can also be economical by eliminating the need for a separate maintenance area. If maintenance must occur onsite, use designated areas, located away from drainage courses. Dedicated maintenance areas should be protected from stormwater runon and runoff, and should be located at least 50 ft from downstream drainage facUities and watercourses. Drip pans or absorbent pads should be used during vehicle and equipment maintenance work that involves fluids, unless the maintenance work is performed over an impermeable surface in a dedicated maintenance area. Place a stockpile of spUl cleanup materials where it wiU be readily accessible. AU fueling trucks and fueling areas are required to have spill kits and/or use other spiU protection devices. Use adsorbent materials on small spUls. Remove the absorbent materials promptly and dispose of properly. Inspect onsite vehicles and equipment daily at startup for leaks, and repair immediately. Keep vehicles and equipment clean; do not allow excessive buUd-up of oil and grease. Segregate and recycle wastes, such as greases, used oU or oU filters, antifreeze, cleaning solutions, automotive batteries, hydraulic and transmission fluids. Provide secondary containment and covers for these materials if stored onsite. Train employees and subcontractors in proper maintenance and spill cleanup procedures. Drip pans or plastic sheeting should be placed under aU vehicles and equipment placed on docks, barges, or other structures over water bodies when the vehicle or equipment is planned to be idle for more than 1 hour. For long-term projects, consider using portable tents or covers ov^er maintenance areas if maintenance cannot be performed offsite. Consider use of new, alternative greases and lubricants, such as adhesive greases, for chassis lubrication and fifth-wheel lubrication. Properly dispose of used oils, fluids, lubricants, and spUl cleanup materials. Do not place used oU in a dumpster or pour into a storm drain or watercourse. Properly dispose of or recycle used batteries. Do not bury used tires. Repair leaks of fluids and oil immediately. 2 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Vehicle & Equipment Maintenance NS-10 Listed below is further information if you must perform vehicle or equipment maintenance onsite. Sa/er AZtematiue Products u Consider products that are less toxic or hazardous than regular products. These products are often sold under an "environmentally friendly" label. • Consider use of grease substitutes for lubrication of truck fifth-wheels. Follow manufacturers label for details on specific uses. • Consider use of plastic friction plates on truck fifth-wheels in lieu of grease. FoUow manufacturers label for detaUs on specific uses. Waste Reduction Parts are often cleaned using solvents such as trichloroethylene, trichloroethane, or methylene chloride. Many of these cleaners are listed in California Toxic Rule as priority pollutants. These materials are harmful and must not contaminate stormwater. They must be disposed of as a hazardous waste. Reducing the number of solvents makes recycling easier and reduces hazardous waste management costs. Often, one solvent can perform a job as well as two different solvents. Also, if possible, eliminate or reduce the amount of hazardous materials and waste by substituting non-hazardous or less hazardous materials. For example, replace chlorinated organic solvents with non-chlorinated solvents. Non-chlorinated solvents like kerosene or mineral spirits are less toxic and less expensive to dispose of properly. Check the list of active ingredients to see whether it contains chlorinated solvents. The "chlor" term indicates that the solvent is chlorinated. Also, try substituting a wire brush for solvents to clean parts. Recycling and Disposal Separating wastes allows for easier recycling and may reduce disposal costs. Keep hazardous wastes separate, do not mix used oU solvents, and keep chlorinated solvents (like,- trichloroethane) separate from non-chlorinated solvents (like kerosene and mineral spirits). Promptly transfer used fluids to the proper waste or recycling drums. Don't leave full drip pans or other open containers lying around. Provide cover and secondaty' containment until these materials can be removed from the site. Oil filters can be recycled. Ask your oil supplier or recycler about recycling oU filters. Do not dispose of extra paints and coatings by dumping liquid onto the ground or throwing it into dumpsters. Allow coatings to dry or harden before disposal into covered dumpsters. Store cracked batteries in a non-leaking secondary container. Do this with all cracked batteries, even if you think all the acid has drained out. If you drop a battery, treat it as if it is cracked. Put it into the containment area until you are sure it is not leaking. Costs All of the above are low cost measures. Higher costs are incurred to setup and maintain onsite maintenance areas. January 2003 California Stormwater BMP Handbook 3 of 4 Construction www.cabmphandbooks.com NS-10 Vehicle & Equipment Maintenance Inspection and Maintenance • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. WhUe activities associated with the BMP are under way, inspect weekly during the rainy season and at two-week intervals in the non-rainy season to verify continued BMP implementation. • Inspect BMPs subject to non-stormwater discharges daily whUe non-stormwater discharges occur. • Keep ample supplies of spiU cleanup materials onsite. • Maintain waste fluid containers in leak proof condition. • Vehicles and equipment should be inspected on each day of use. Leaks should be repaired immediately or the problem vehicle(s) or equipment should be removed from the project site. • Inspect equipment for damaged hoses and leaky gaskets routinely. Repair or replace as needed. References Blueprint for a Clean Bay: Best Management Practices to Prevent Stormwater PoUution from Construction Related Activities; Santa Clara VaUey Nonpoint Source Pollution Control Program, 1995- Coastal Nonpoint PoUution Control Program; Program Development and Approval Guidance, Working Group, Working Paper; USEPA, AprU 1992. Stormwater Quality Handbooks - Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. 4 of 4 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com ATTACHMENT 10 - POST CONSTRUCTION BMPs Hydroseeding EC-4 Description and Purpose Hydroseeding ty'pically consists of applying a mixture of wood fiber, seed, fertUizer, and stabUizing emulsion with hydro- mulch equipment, to temporarily protect exposed soUs from erosion by water and wind. Suitable Applications Hydroseeding is suitable for soU disturbed areas requiring temporaty protection until permanent stabilization is established, and disturbed areas that wiU be re-disturbed following an extended period of inactivity. Limitations • Hydroseeding may be used alone only when there is sufficient time in the season to ensure adequate vegetation establishment and coverage to provide adequate erosion control. Otherwise, hydroseeding must be used in conjunction with mulching (i.e., straw mulch). • Steep slopes are difficult to protect with temporary seeding. • Temporaty seeding may not be appropriate in dry periods without supplemental irrigation. • Temporary vegetation may have to be removed before permanent vegetation is applied. • Temporaty vegetation is not appropriate for short term inactivity. Objectives EC Erosion Control • SE Sediment Control TC Tracking Control WE Wind Erosion Control NS Non-Stormwater Management Control WM Waste Management and Materials Pollution Control Legend: ^ Primary Objective / Secondary Objective Targeted Constituents Sediment ^ Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives EC-3 Hydraulic Mulch EC-5 Soil Binders EC-6 Straw Mulch EC-7 Geotextiles and Mats EC-8 Wood Mulching CASQA California Stormwater Quality '.k Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 EC-4 Hydroseeding Implementation In order to select appropriate hydroseeding mixtures, an evaluation of site conditions shall be performed with respect to: Soil conditions - Maintenance requirements - Site topography - Sensitive adjacent areas Season and climate - Water avaUabUity - Vegetation types - Plans for permanent vegetation The local office of the U.S.D.A. Natural Resources Conservation Service (NRCS) is an exceUent source of information on appropriate seed mixes. The foUowing steps shall be followed for implementation: • Avoid use of hydroseeding in areas where the BMP would be incompatible with future earthwork activities and would have to be removed. • Hydroseeding can be accomplished using a multiple step or one step process. The multiple step process ensures maximum direct contact of the seeds to soU. When the one step process is used to apply the mixture of fiber, seed, etc., the seed rate shaU be increased to compensate for aU seeds not having direct contact \vith the soil. • Prior to application, roughen the area to be seeded with the furrows trending along the contours. • Apply a straw mulch to keep seeds in place and to moderate soil moisture and temperature until the seeds germinate and grow. • All seeds shall be in conformance with the California State Seed Law of the Department of Agriculture. Each seed bag shall be delivered to the site sealed and clearly marked as to species, purity, percent germination, dealer's guarantee, and dates of test. The container shall be labeled to clearly reflect the amount of Pure Live Seed (PLS) contained. All legume seed shall be pellet inoculated. Inoculant sources shall be species specific and shall be applied at a rate of 2 lb of inoculant per ioo lb seed. • Commercial fertUizer shall conform to the requirements of the California Food and Agricultural Code. FertUizer shall be pelleted or granular form. • Follow up applications shall be made as needed to cover weak spots and to maintain adequate soil protection. • Avoid over spray onto roads, sidewalks, drainage channels, e.xisting vegetation, etc. Costs Average cost for installation and maintenance may vary from as low as $300 per acre for flat slopes and stable soUs, to $1600 per acre for moderate to steep slopes and/or erosive soils. 2 of 3 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Hydroseeding EC-4 Hydroseeding Installed Cost per Acre High Density Ornamentals $400 - $1600 High Density Turf Species $350 High Density Bunch Grasses $300-$1300 Fast Growing Annual $350 - $650 Fast Growing Perennial $300 - $800 Non-Competing Native $300-$1600 Non-Competing Non-Native $400 - $500 Sterile Cereal Grain $500 Source: Caltrans Guidance for Soil Stabilization for Temporary Slopes, Nov. 1999 Inspection and Maintenance • Inspect BMPs prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non-rainy season. • Areas where erosion is evident shall be repaired and BMPs re-apphed as soon as possible. Care should be exercised to minimize the damage to protected areas whUe making repairs, as any area damaged will require re-application of BMPs. • Where seeds faU to germinate, or they germinate and die, the area must be re-seeded, fertUized, and mulched within the planting season, using not less than half the original application rates. • Irrigation systems, if applicable, should be inspected daily whUe in use to identify system malftmctions and line breaks. When line breaks are detected, the system must be shut down immediately and breaks repaired before the system is put back into operation. • Irrigation systems shall be inspected for complete coverage and adjusted as needed to maintain complete coverage. References Stormwater Quality Handbooks Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Guidance Document: SoU Stabilization for Temporary Slopes, State of California Department of Transportation (Caltrans), November 1999. January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 3 of 3 Wood Mulching EC-8 Description and Purpose Wood mulching consist of applying a mixture of shredded wood mulch, bark or compost to disturbed soils. The primary ftinction of wood mulching is to reduce erosion by protecting bare soU from rainfall impact, increasing infiltration, and reducing runoff. Suitable Appiications Wood mulching is suitable for disturbed soU areas requiring temporaty protection untU permanent stabilization is established. Limitations • Not suitable for use on slopes steeper than 3:1 (H:V). Best suited to flat areas or gentle slopes or 5:1 (H:V) or flatter. • Wood mulch and compost may introduce unwanted species. • Not suitable for areas exposed to concentrated flows. • May need to be removed prior to further earthwork. Implementation Mulch Selection There are many types of mulches. Selection of the appropriate type of mulch should be based on the type of application, site conditions, and compatibUity with planned or future uses. Application Procedures Prior to application, after existing vegetation has been removed, roughen embankment and fill areas by roUing with a device such as Objectives EC SE TC WE NS WM Erosion Control Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective • Secondary Objective Targeted Constituents Sediment Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives EC-3 Hydraulic Mulch EC-4 Hydroseeding EC-5 Soil Binders EC-6 Straw Mulch EC-7 Geotextiles and Mats CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 3 EC-8 Wood Mulching a punching type roller or by track walking. The construction application procedures for mulches vaty significantly depending upon the type of mulching method specified. Two methods are highlighted here: • Green Material: This type of mulch is produced by the recycling of vegetation trimmings such as grass, shredded shrubs, and trees. Methods of application are generally by hand although pneumatic methods are avaUable. - Green material can be used as a temporaty ground cover v\ith or without seeding. - The green material should be evenly distributed on site to a depth of not more tiian 2 in. • Shredded Wood: Suitable for ground cover in ornamental or revegetated plantings. - Shredded wood/bark is conditionally suitable. See note under limitations. Distribute by hand or use pneumatic methods. Evenly distribute the mulch across the soil surface to a depth of 2 to 3 in. • Avoid mulch placement onto roads, sidewalks, drainage channels, e.xisting vegetation, etc. Costs Average annual cost for instaUation and maintenance (3-4 months useful life) is around $4,000 per acre, but cost can increase if the source is not close to the project site. Inspection and Maintenance • Inspect BMPs prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non-rainy season. • Areas where erosion is evident shall be repaired and BMPs reapplied as soon as possible. Care should be exercised to minimize the damage to protected areas while making repairs, as any area damaged wiU require reapplication of BMPs. • Regardless of the mulching technique selected, the key consideration in inspection and maintenance is that the mulch needs to last long enough to achieve erosion control objectives. Ifthe mulch is applied as a stand alone erosion control method over disturbed areas (without seed), it should last the length of time the site will remain barren or untU final re-grading and revegetation. • Where vegetation is not the ultimate cover, such as ornamental and landscape applications of bark or wood chips, inspection and maintenance should focus on longevity and integrity of the mulch. • Reapply mulch when bare earth becomes visible. References Controlling Erosion of Construction Sites Agriculture Information Bulletin #347, U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS) (formerly SoU Conservation Service - SCS). 2 of 3 California stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Wood Mulching EC-8 Guides for Erosion and Sediment Control in California, USDA Soils Conservation Service, Januaty' 1991. Manual of Standards of Erosion and Sediment Control Measures, Association of Bay Area Governments, May 1995. Proposed Guidance Specifying Management Measures for Sources of Nonpoint PoUution in Coastal Waters, Work Group Working Paper, USEPA, April 1992. Sedimentation and Erosion Control, An Inventoiy of Current Practices Draft, U.S. EPA, April 1990. SoU Erosionby Water Agricultural Information BuUetin #513, U.S. Department of Agriculture, Soil Conservation Service. Stormwater Quality Handbooks Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Water Quality Management Plan for the Lake Tahoe Region, Volume II, Handbook of Management Practices, Tahoe Regional Planning Agency, November 1988. January 2003 California Stormwater BMP Handbook 3 of 3 Construction www.cabmphandbooks.com Earth Dikes and Drainage Swales EC-9 Description and Purpose An earth dike is a temporaty berm or ridge of compacted soU used to divert runoff or channel water to a desired location. A drainage swale is a shaped and sloped depression in the soU surface used to convey runoff to a desired location. Earth dikes and drainage swales are used to divert off site runoff around the construction site, divert runoff from stabilized areas and disturbed areas, and direct runoff into sediment basins or traps. Suitable Applications Earth dikes and drainage swales are suitable for use, individually or together, where runoff needs to be diverted from one area and conveyed to another. • Earth dikes and drainage swales may be used: To convey surface runoff down sloping land - To intercept and divert runoff to avoid sheet flow over sloped surfaces - To divert and direct runoff towards a stabUized watercourse, drainage pipe or channel - To intercept runoff from paved surfaces Below steep grades where runoff begins to concentrate - Along roadways and facUity improvements subject to flood drainage Objectives Erosion Control ^ Sediment Control Tracking Control Wind Erosion Control Non-Stormwater Management Control Waste Management and Materials Pollution Control Legend: ^ Primary Objective y Secondary Objective EC SE TC WE NS WM Targeted Constituents Sediment ^ Nutrients Trash Metals Bacteria Oil and Grease Organics Potential Alternatives None CASQA California Stormwater Quality Association January 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 1 of 7 EC-9 Earth Dikes and Drainage Swales - At the top of slopes to divert runon from adjacent or undisturbed slopes - At bottom and mid slope locations to intercept sheet flow and convey concentrated flows Divert sediment laden runoff into sediment basins or traps Limitations Dikes should not be used for drainage areas greater than lo acres or along slopes greater than lo percent. For larger areas more permanent drainage structures should be buUt. All drainage structures should be buUt in compliance with local municipal requirements. • Earth dikes may create more disturbed area on site and become barriers to construction equipment. • Earth dikes must be stabUized immediately, which adds cost and maintenance concerns. • Diverted stormwater may cause downstream flood damage. • Dikes should not be constructed of soils that may be easily eroded. • Regrading the site to remove the dike may add additional cost. • Temporary drains and swales or any other diversion of runoff should not adversely impact upstream or downstream properties. • Temporary drains and swales must conform to local floodplain management requirements. • Earth dikes/drainage swales are not suitable as sediment trapping devices. • It may be necessary to use other soil stabilization and sediment controls such as check dams, plastics, and blankets, to prevent scour and erosion in newly graded dikes, swales, and ditches. Implementation The temporary earth dike is a berm or ridge of compacted soU, located in such a manner as to divert stormwater to a sediment trapping device or a stabilized outlet, thereby reducing the potential for erosion and offsite sedimentation. Earth dikes can also be used to divert runoff from offsite and from undisturbed areas away from disturbed areas and to divert sheet flows away from unprotected slopes. An earth dike does not itself control erosion or remove sediment from runoff. A dike prevents erosion by directing runoff to an erosion control device such as a sediment trap or directing runoff away from an erodible area. Temporary diversion dikes should not adversely impact adjacent properties and must conform to local floodplain management regulations, and should not be used in areas with slopes steeper than 10%. Slopes that are formed during cut and fill operations should be protected from erosion by runoff. A combination of a temporary drainage swale and an earth dike at the top of a slope can divert runoff to a location where it can be brought to the bottom of the slope (see EC-11, Slope Drains). A combination dike and swale is easily constructed by a single pass of a buUdozer or grader and 2 of 7 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Earth Dikes and Drainage Swales EC-9 compacted by a second pass of the tracks or wheels over the ridge. Diversion structures should be instaUed when the site is initially graded and remain in place untU post construction BMPs are instaUed and the slopes are stabilized. Diversion practices concentrate surface runoff, increasing its velocity and erosive force. Thus, the flow out of the drain or swale must be directed onto a stabilized area or into a grade StabUization structure. If signiflcant erosion wiU occur, a swale should be stabUized using vegetation, chemical treatment, rock rip-rap, matting, or other physical means of stabilization. Any drain or swale that conveys sediment laden runoff must be diverted into a sediment basin or trap before it is discharged from the site. General • Care must be applied to correctly size and locate earth dikes, drainage swales. Excessively steep, unlined dikes, and swales are subject to erosion and gully formation. • Conveyances should be stabUized. • Use a lined ditch for high flow velocities. • Select flow velocity based on careful evaluation of the risks due to erosion of the measure, soil types, overtopping, flow backups, washout, and drainage flow patterns for each project site. • Compact any fiUs to prevent unequal settlement. • Do not divert runoff onto other property without securing wTitten authorization from the property owner. • When possible, install and utilize permanent dikes, swales, and ditches early in the construction process. • Provide stabilized outlets. Earth Dikes Temporary earth dikes are a practical, inexpensive BMP used to divert stormwater runoff. Temporary diversion dikes should be instaUed in the foUowing manner: • AU dikes should be compacted by earth moving equipment. • All dikes should have positive drainage to an outlet. • All dikes should have 2:1 or flatter side slopes, 18 in. minimum height, and a minimum top width of 24 in. Wide top widths and flat slopes are usually needed at crossings for construction traffic. • The outlet from the earth dike must function with a minimum of erosion. Runoff should be conveyed to a sediment trapping device such as a Sediment Trap (SE-3) or Sediment Basin (SE-2) when either the dike channel or the drainage area above the dike are not adequately StabUized. January 2003 California Stormwater BMP Handbook 3 of 7 Construction www.cabmphandbooks.com EC-9 Earth Dikes and Drainage Swales • Temporary stabiUzation may be achieved using seed and mulching for slopes less than 5% and either rip-rap or sod for slopes in excess of 5%. In either case, stabUization of the earth dike should be completed immediately after construction or prior to the first rain. • If riprap is used to stabilize the channel formed along the toe of the dike, the foUowing typical specifications apply: Channel Grade Riprap Stabilization 0.5-1.0% 4 in. Rock 1.1-2.0% 6 in. Rock 2.1-4.0% 8 in. Rock 4.1-50% 8 in. -12 in. Riprap • The stone riprap, recycled concrete, etc. used for stabilization should be pressed into the soU with construction equipment. • FUter cloth may be used to cover dikes in use for long periods. • Construction activity on the earth dike should be kept to a minimum. Drainage Swales Drainage swales are only effective if they are properly instaUed. Swales are more effective than dikes because they tend to be more stable. The combination of a swale with a dike on the downhiU side is the most cost effective diversion. Standard engineering design criteria for small open channel and closed conveyance systems should be used (see the local drainage design manual). Unless local drainage design criteria state othen\ise, drainage swales should be designed as follows: • No more than 5 acres may drain to a temporary drainage swale. • Place drainage swales above or below, not on, a cut or fill slope. • Swale bottom width should be at least 2 ft • Depth of the swale should be at least 18 in. • Side slopes should be 2:1 or flatter. • Drainage or swales should be laid at a grade of at least 1 percent, but not more than 15 percent. • The swale must not be overtopped by the peak discharge from a 10-year storm, irrespective of the design criteria stated above. • Remove all trees, stumps, obstructions, and other objectionable material from the swale when it is built. a Compact any fill material along the path of the swale. 4 of 7 California Stormwater BMP Handbook Construction www.cabmphandbooks.com January 2003 Earth Dikes and Drainage Swales EC-9 • StabUize all swales immediately. Seed and mulch swales at a slope of less than 5 percent, and use rip-rap or sod for swales with a slope between 5 and 15 percent. For temporaty swales, geotextiles and mats (EC-7) may provide immediate stabUization. • Irrigation may be required to establish sufficient vegetation to prevent erosion. • Do not operate construction vehicles across a swale unless a stabUized crossing is provided. • Permanent drainage facilities must be designed by a professional engineer (see the local drainage design criteria for proper design). • At a minimum, the drainage swale should conform to predevelopment drainage patterns and capacities. • Construct the drainage swale with a positive grade to a stabilized outlet. • Provide erosion protection or energy dissipation measures if the flow out of the drainage swale can reach an erosive velocity. Costs • Cost ranges from $15 to $55 per ft for both earthwork and stabUization and depends on avaUabUity of material, site location, and access. • SmaU dikes: $2.50 - $6.50/Unear ft; Large dikes: $2.5o/yd3. • The cost of a drainage swale increases with drainage area and slope. Typical swales for controlling internal erosion are inexpensive, as they are quickly formed during routine earthwork. Inspection and Maintenance • Inspect BMPs prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non-rainy season. • Inspect BMPs subject to non-stormwater discharges daily whUe non-stormwater discharges occur. • Inspect ditches and berms for washouts. Replace lost riprap, damaged linings or soil stabilizers as needed. • Inspect channel linings, embankments, and beds of ditches and berms for erosion and accumulation of debris and sediment. Remove debris and sediment and repair linings and embankments as needed. • Temporaty conveyances should be completely removed as soon as the surrounding drainage area has been stabilized or at the completion of construction References Erosion and Sediment Control Handbook, S.J. Goldman, K. Jackson, T.A. Bursetynsky, P.E., McGraw HiU Book Company, 1986. January 2003 California Stormwater BMP Handbook 5 of 7 Construction www.cabmphandbooks.com EC-9 Earth Dikes and Drainage Swales Manual of Standards of Erosion and Sediment Control Measures, Association of Bay Area Governments, May 1995. National Association of Home Builders (NAHB). Stormwater Runoff & Nonpoint Source Pollution Control Guide for Builders and Developers. National Association of Home BuUders, Washington, D.C, 1995 National Management Measures to Control Nonpoint Source PoUution from Urban Areas, United States Environmental Protection Agency, 2002. Southeastern Wisconsin Regional Planning Commission (SWRPC). Costs of Urban Nonpoint Source Water PoUution Control Measures. Technical Report No. 31. Southeastern Wisconsin Regional Planning Commission, Waukesha, WI. 1991 Stormwater Quality Handbooks Construction Site Best Management Practices (BMPs) Manual, State of California Department of Transportation (Caltrans), November 2000. Stormwater Management ofthe Puget Sound Basin, Technical Manual, Publication #91-75, Washington State Department of Ecology, February 1992. Water Quality Management Plan for the Lake Tahoe Region, Volume II, Handbook of Management Practices, Tahoe Regional Planning Agency, November 1988. 6 of 7 California Stormwater BMP Handbook January 2003 Construction www.cabmphandbooks.com Earth Dikes and Drainage Swales EC-9 Compacted fill Stabilizing cover, when needed. Natural ground line 2:1 (H:V) slope or flatter YPICAL DRAINAGE SWALE NOT TO SCALE NOTES: 1. Stabilize inlet, outlets and slopes. 2. Properly compact the subgrade. Compacted Stabilizing cover, vvhen needed Natural ground line 'YPICAL EARTH DIKE NOT TO SCALE Januar/ 2003 California Stormwater BMP Handbook Construction www.cabmphandbooks.com 7 of 7 ATTACHMENT 11 - ENHANCED TREATMENT CONTROL BMP SELECTION MATRIX (U, L, M, H) San Diego County Code of Regulatory Ordinances TITLE 6 HEALTH ANO SANITATION* • ' OIVISION 7. V/ATER AND V/ATER SUPPLIES* .ATT.ACH.MENT G-3 ENH.-\NCED TRE.ATMENT CO.NTROLS BMP SELECTION MATRIX Enhanced Treatment Control BMP Selection Matrix Concern Tnatmen: Control BMP Ccti^ories Biofilc its Dete.tcion Bas ini Infiltration Basins'-' Wet Ponds or Wetlands Drainage Insert Filtration Continuous Flow Deflection Syste.T.s'^ Sedirr.snc M K H H M H NC NuC'iencs L M M M M M L Heavy Metals M U H M H L Organic ''' Compoands U U U U L NC L Trash & Debns L K U U M K NC Oxygen Deraa.^.ding Scbsra.-.ces L U y. M L N[ L Bacceria U U K U L NI L Oil &. Grease U Nf u U L H L ?e3:icides U U u U L U L (1) The Cour.ty will periodically asiess the pen (2> Including t.-e.-ches a.-,d porous pave.r.er.c. (3) .-Mso k-own as hydrod;. r.amic devices a,-d b orrr.ar.ce charac affie boxes. teristics of many ofthese BMPs to update this table. L (Lo'.v): Lo'.v re.T.ovil e: .\; (\fidiu-): .\JediL~ re:T H (H:gh): High removal e: L': L'.nk.nov.r, re.-ovi' efr'.c Iciency .ova' ef: •'ciencv ie.-,.:y. a Ici ency pelican: r.-n : provide evide,'' oe SLipporJng cs SoL::ei: G::;.:'.:':, S.v;'.-?:-'.::.v- B-:s: r:L-; D.:.-.:r :si (2001), and is cf S-3r.p.;'v:: FoV.:i:':or. ir. Coc Ciildi f-7rBM? SiUciioi: ir. Ur'z j:z'. V/c:jri (1993,1. Sc:::onzl •zr. Di'.i'.ocid .Ari:zs (2001.)- ATTACHMENT 12 - FILTRATION SAMPLES U.S. Patent Numbcr 5,720,574 KRISTAR KriStar Enterprises, Inc. 8364 Industrial Avetiue Cotati, CA 94931 (800) 579-8819 / (707) 792-4665 (707) 792-4669 fax www.Kristar.com KriStar Enterprises, Inc., 8364 Industrial Avenue, Cotati CA 94531 (800) 579-8819 - (707) 792-4665 - Fax: (707) 792-4669 IMPORTANT QUESTIONS AND ANSWER^ 1. WHAT IS FOSSIL FILTER"^'? Fossil Filter is a trough structure that is installed just under the grate of water drarnage inlets. The structure contains EPA-approved sorbents which collect petroleum hydrocarbons and other contaminants while permitting the undisturbed passage of water. FossU Filter is patented and is a product of KriStar Enterprises, Inc. of Cotati, Califomia. 2. WHAT ARE THE MOST APPROPRI.ATE APPLICATIO.NS FOR FOSSIL FILTER? Fossil Filter was developed and designed to remove petroleum hydrocarbons firom water runoff. Its most logical application is anywhere motor vehicles park, are refueled or serviced. Customer and employee poking lots and corporation yards, service stations, airport ramps and refueling areas, even some marinas, are excellent prospects for the installation of Fossil Filter. The Fossil Filter concept can usually be utilized anywhere there is a hydrocarbon problem and the water runoff can be channeled to flow through the Fossil Filter. 3. WH.AT MATERIALS ARE USED IN THE MANUFACTURE OF FOSSIL FILTER? With most models of Fossil Filter, the apparatus structure is available in high density polyethylene (HDPE) (plastic), fiberglass or stainless steel. The incorporated screens and mounting flanges are made from stainless steel. (See #9 for a discussion of Fossil Rock, the incorporated adsorbent material.) 4. W H.AT IS THE FOSSIL FILTER CONCEPT? HOW DOES IT WORK? The Fossil Filter concept, which is patented, is essentially as follows: As the surface water flows mto the inlet, it passes through the Fossil Filter where Fossil Rock, the installed adsorbent material, removes petroleum-based contaminants while the water flows on into the drainage system. The Fossil Filter with Silt Basin incorporates a perimeter basin and polyester substrate "skirt". The water flows flrst into the basin where silt, sediment and debris are collected and contained and then through the filter skin, through the Fossil Rock adsorbent where the contaminants are removed, and then into the drainage system. The Fossil Rock adsorbent used in Fossil Filter removes the contaminants from the water through a process called adsorption (acts like a magnet) rather than absorption (acts like a sponge). 5 WILL THE USE OF FOSSIL FILTER S.ATISFY CURRENT FEDERAL EPA NPDES CRITERIA? CAN FOSSIL FILTER BE INCLUDED AS A CO.MPONENT OF A COMMUNITY'S SWTPP (STORMW ATER POLLUTION PREVENTION PROGRAM)? The Federal EPA's NTDES program, designed to control the discharge of pollutants to waters ofthe United States, cites a definition of oil/water separator as '"A device installed usually at the entrance ofa drain, which removes oil and grease from water flows entering the drain." That literally describes FossU Filter. EPA funher mandates the use of B.AT (Best Available Technology) while being "economically feasible". Fossil Filter is verv appropriate for inclusion in SWTPP's as a BMP (best management practice) for removal of oil and grease from water flows entering the drain. As a matter-of-fact, Fossi! Filter has been cited as a BMP in the SWPPP's of many of the local govemments and that of several states. (Rev. 7/10/98) 6. HOW IS FOSSIL FILTER INSTALLED? In a four-sided (square or rectangular) drainage inlet? There are three options available for a four-sided inlet: The flrst option, for non-standard size inlets, is to assemble the filter from a kit. The trough assembly is fabricated to fit snugly within the inside dimensions of the inlet. The filter cartridges (4) are then fabricated to fit within the trough assembly. The cartridges are then filled with Fossil Rock adsorbent and placed inside the trough assembly. The inlet grate is removed and the entire assembly is then installed by resting the assembly's perimeter flanges on the ledge where the inlet grate rests and the grate is then replaced. With inlets that do not have a grate ledge, the kit will include sides without flanges and the assembly is secured to the inlet walls with concrete anchor bolts. The second option, for standard (common size) inlets manufacmred by many of the more prominent precast concrete companies, is a pre-assembled one-piece "drop-in" unit. It is shipped with Fossil Rock installed and is ready for installation. It is installed by removing the inlet grate, insening the unit to rest on the grate ledges or bolting to the inlet wall (as above), and replacing the grate. The third option is a pre-formed one-piece fiberglass Fossil Filter with SUt Basin, which comes in sizes to fit the more common size inlets. It too is installed by resting it on the grate ledge. In a curb inlet or trench drain? Depending on the length of the curb opening or trench drain, the sections are either cut or assembled to the appropriate length. With the fiberglass or stainless steel units, the two ends are capped. Filter cartridges are then assembled. Fossil Rock inserted, and the cartridges inserted into the straight rail trough. The assembly is then attached to the inlet wall, just below the surface where the water enters the inlet. In a round inlet? Round units are pre-assembled one-piece units available in some standard sizes. They are installed by removing the inlet grate, resting the flange on the grate ledge and replacing the grate. NOTE: Special orders for odd sizes or shapes of inlet are possible. Call KriStar Enterprises, Inc at (800) 579-8819 with special problems. 7. WHEN INSTALLED, WTLL THE FOSSIL FILTER RESTRICT THE FLOW OF W ATER? WILL IT CAUSE THE DRAINAGE SYSTEM TO BACK UT? No, on both counts. If the fliter has been properly maintained and not subjected to excessive amounts of debris (leaves, litter, silt, etc.). (See 8 below conceming hydrologic testing.) Fossil Filter is designed to remove harmful contaminants during initial and low flows ("first flush"), when the bulk of the surface- accumulated contaminants enter the inlet. Plus, because it is hydrophobic, the FossU Rock adsorbent tends to float and move about which enhances the flow. In the event of very heavy flows, which exceed the flow-through capability, the filter's design allows the excess water to flow over the inside edge ofthe fliter rail, into the overflow bypass area, and then on into the drainage system. SOTE: Because ofthe large bypass area, Fossil Filter will not/can not plug up the drainage system. 8. HAS THE FOSSIL FILTER BEEN SUBJECTED TO H\DROLOGICAL TESTING? Yes. Tests by Sandine Engineering Associates of Santa Rosa and Eagle Engineering of Sacramento, Califomia both showed that installed FossU Filters did not impede maximum design flow of the inlet and that they would effectively filter in excess of 12 gallons per minute per Unear foot of fliter surface. (Rev. 7/10/98) 9. WHAT SORBENT MATERIAL IS USED IN THE FOSSIL FILTER? IS IT HAZARDOUS? According to the supplier of Fossil Rock, the adsorbent used exclusively in Fossil Filter, the petroleurn hydrocarbon-attracting material, is a natural material known as Amorphous Alumina Silicate. It is an inert blend of minerals that contains non-hazardous ingredients, as defined by the Federal EPA, OSHA (Occupational Safety and Health Administration) and WHO (World Health Organization). However, if a large amount of the material in bulk form is contained within a confined area and there is dust, or if the person replacing the filter material is allergic to dust, we recommend using a paper mask to avoid inhalation of the fine particles. Fossil rock contains no reactive chemicals, is non-carcinogenic, non- biodegradable and non-leaching, non-toxic, non-flanamable, non-injurious to asphalt, cement, carpet, tile, soil, or plant life. (A Material Safety Data Sheet (MSDS) is available for the product, on request.) 10. HAS THE FOSSIL ROCK ADSORBENT BEEN TESTED FOR EFFICIENCY? According to KriStar's supplier. Fossil Rock will adsorb approximately 1.92 gallons of liquid contaminant per cubic foot of Fossil Rock. Therefore, a typical 24" x 24" fliter, which contains approximately .56 cubic feet of Fossil Rock, would adsorb approximately 1.08 gallons of liquid contaminant. 11. W HAT ARE THE MAINTENANCE REQUIREMENTS? WHAT IS THE USEFUL LIFE OF THE INSTALLED ADSORBENT? As with all products subject to the abuses of nature and mankind, the installed Fossil FUter requires periodic inspection and all foreign objects (leaves, cans, cigarette butts, papers, etc.) removed. The area around the inlet should be swept on a regular basis. The installed Fossil Rock adsorbent should be inspected and replaced ifthe surface ofthe granules is more than 509c coated with contaminants and/or the unit has become clogged with silt or sediment (see #12). To insure efficiency, it is recommended that, as a minimum, the units be inspected at least three times per year (i.e. once before and twice during the rainy season). In areas subject to excessive debris, the inspections should be more frequent. (See #16 and #17 for discussion on available maintenance plans.) According to the supplier, the useful life of the installed Fossil Rock, under normal usage, is estimated to be about six months. Areas with heavy vehicle traffic or subject to pefiroleum hydrocarbon spillage may require more frequent changes. 12. WILL THE FOSSIL FILTER FUNCTION EFFECTIVELY IN AREAS SUBJECT TO HEAVY SILT, SEDI.ME.NT OR DEBRIS? Yes. however, in such areas, use of a duel stage filter is recommended. This involves mounting a secondary fliter just below the overflow lip of the primary filter. The primary (upper) unit capmres silt, sediment and debris during its useful life. If it becomes clogged, the water will flow over the overflow lip and fall into the secondary (lower) stage and be filtered. 13. ARE THERE KNOWN "ACCEPTED" PRODUCTS CURRENTLY ON THE MARKET THAT FUNCTION AS EFFICIENTLY AS FOSSIL FILTER IN THE REMOVAL OF CONTA.MINANTS FROM WATER RUNOFF? Until the creation of Fossil FUter, the Best Available Technology (BAT) for removing petroleum hydrocarbons from water runoff included the use of underground large-capacity concrete oil/water separators. Compared to Fossil Filter, they are less efflcient and more difficult and more expensive to install and maintain. In addition, due to high construction costs, they are not generally suitable for post- construction (retroflt) projects. 14. W H.AT IS THE COST PER FILTER UNIT OF FOSSIL ROCK ADSORBENT? One 24" x 24" Fossil Filter contains approximately .56 cubic feet of adsorbent. One ten-pound bag of Fossil Rock (cost S30) contains 1.3 cubic feet of adsorbent material. Therefore, since one bag will fill two such filters, it costs about S15 to replace the adsorbent in one filter. (Rev. 7/10/98) 15. ONCE REMOVED FROM THE FOSSIL FILTER, IS THE EXPOSED ADSORBENT CONSIDERED HAZARDOUS MATERIAL? HOW IS IT DISPOSED OF? Even though Fossil Rock is a non-leaching and environmentally friendly substance, once it has been exposed to contaminants, it technically becomes "Used Oil Adsorbent Material" with disposal requirements similar to those of oUy rags. The method of handling contaminated substances varies with the jurisdiction so maintenance personnel should contact their local regulatory agency to ensure regulatory compliance. NOTE: KriStar has both in-house and contract certified maintenance personnel (See »16 below) that are familiar with the complexities of the filter, the exchange of adsorbent and the disposal process. Use of their e.xpertise lessens the chance of liability on the part ofthe landowner. 16. ARE FOSSIL FILTER INSTALLERS AVAILABLE? ARE M.AI.NTENANCE PLANS AVAILABLE? Yes on both accounts. KriStar has formed a team of company-cenified FossU Filter installers and maintenance personnel. (Call (800) 579-8819 for names.) KriStar has an in-house capabUity of performing what it calls "FuU Circle Service". NOTE: Some California cities are now requiring proof of a follow-on maintenance program before they will issue a final clearance to a project. 17 WHO IS RESPONSIBLE FOR M.AI.NTAINING THE INSTALLED FOSSIL FILTERS? FOR PROPER DISPOSAL OF THE CO.NTA.MIN.ATED ADSORBENT? NOTE: Federal. State and local Clean Water Act regulations and those of insurance carriers require that Storm Water Filtration Systems be maintained and serviced on a regular basis. The intent ofthe regulations is to insure that the systems efficiently filter petroleum hydrocarbons, chemicals, silt and other harmful pollutants from stormwater runoff. Once the filter is installed, it is the responsibility of the landowner to make sure that it continues to function. As to maintenance, the landowner has the choice of maintaining the installed filters with intemal resources or, to avoid loss of manufacturer warranty, to use the services of a certified Fossil FUter maintenance company. As the generator, the landowner is responsible for proper handling and disposal of the contaminated adsorbent. (See #15) 18. WHAT DOES A TYPICAL MAINTENANCE PLAN INCLUDE? WHAT DOES IT COST? KriStar's in-house plans are based on exposure to silt, sediment and debris and exposure to petroleum hvdrocarbon contaminants. The following plans are per year: Service Plan A: (Recommended minimum): Three (3) cleanings with one (1) change of filter sorbent. Service Plan B: (Manufacturer recommended): Three (3) cleanings with two (2) changes of sorbent. Service Plan C: (Special plan for heavy debris and pollutant loading): More than three (3) cleanings and as many changes of sorbent as necessary. Each service will include removal of debris and broom cleaning around the inlet. The inlet grate will be removed, the filter structure inspected for damage and the installed sorbent inspected for remaining useful life. The sorbent will be replaced as per service Plan. The area will be broom cleaned once more and the 2rate replaced. The contaminated adsorbent will be propedy handled and disposed of Subsequent to the service, the land owner and the city involved will be fumished certificates of service. The cost is based on the type of plan, the number of filters installed at the site and other factors. A "ball park" cost for Service Plan A (three visits, one sorbent change and proper handling and disposal of the contaminated adsorbent) would be about S180 per filter. 19. HOW DO I GET MORE INTORMATION ON FOSSIL FILTER? ON THE \I\INXENWCE PLANS*' Contact KriStar's national sales office in Cotati. Califomia toll free (800) 579-8819, fax (707)792-4669, e-mail at customercare(aKristar.com or visit our web site at www.kristar.com FOSSIL FILTER™ GENER\L SFECIFICATIONS FOR STANDARD FILTER UNITS Scope: This specification describes a Catch Basin Filtration System that removes petroleum hydrocarbons fi-om water flowing into the drainage inlet while permitting the undisturbed passage ofthe water. The filter incorporates EPA-approved adsorbents and is installed in the catch basin of a drainage inlet. Material Properties: The filter structure shall be manufactured from either High Density Polyethylene (HDPE), petroleum resistant fiberglass or stainless steel, at the option of the end-user. The filter screens and associated hardware for all units will be stainless steel Type 304. The filter sorbent shall be an adsorbent material treated to attract and retain petroleum hydrocarbons. It shall be non-leaching and contain no hazardous ingredients as defined by the U.S.Environmental Protection Agency (EPA), US Occupational Safety and Health administration (OSHA), and the World Health Organization (WHO). Installation: InstaUation shall be performed by certified Fossil Fiher"^ Installation Technician. A Fossil Filter^ Installation Record, to be provided at time of installation, shall be kept on site by the end user. Filter Maintenance and Disposal of the Contaminated Adsorbent*: Periodic maintenance ofthe instaUed units is vital to efficient filtration. Such maintenance shall be performed by certified FossU FUter™ Maintenance Technician. A Fossil Filter^ Maintenance Record, provided at the time of instaUation, shaU be kept on site by the end user. Disposal ofthe contaminated adsorbent shaU be in accordance with local regulatory agency requirements and local, state and federal emironmental regulations. •Proof of adequate foUow-on maintenance of the filter and proper disposal of the ^ contaminated adsorbent is now being required by some local govemments at the time of filter instaUation. (Rev. 8/11/98) LIMITED WARRANTY KRISTAR ENTERPRISES, INC. TO THE EXTENT PERMITTED BY THE LAW OF YOUR JURISDICTION, THIS LIMITED WARRANTY LIMITS OR EXCLUDES CERTAIN WARRANTIES OR RIGHTS OTHERWISE PROVIDED BY LAW. KriStar Enterprises, Inc. ("KriStar") hereby warrants its products to be free from defects in material and workmanship for a period of one (I) year from the date of original purchase by the person or entity purchasing KriStar's products direcUy from KriStar or from KriStar's authorized representatives or re-sellers ("Purchaser"). There are no other warranties or representations with respect to the nature or quality of KriStar's products. Under no circumstances shall KriStar be liable for incidental, consequential, or other or additional damages of any kind or nature whatsoever, including without limitation, shipping and freight charges, instaUation and/or removal expenses including labor, interest, attomey fees, or other costs, w hether such claim is based upon principles or theories of contract, warranty, negligence and/or tort law. IT IS EXPRESSLY AGREED THAT THIS WARRANTY IS THE EXCLUSIVE AND ONLY WARRANTY TO PASS WITH KRISTAR'S PRODUCTS. AND THAT THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, INCLUDING WrTHOUT LIMITATION, THOSE OF FITNESS FOR A PARTICULAR PURPOSE ANT) MERCHANTABELFTY. In the event such disclaimer of implied warranties is held to be unenforceable or otherwise invalid, or if Purchaser or any third party, including without limitation employees, assigns, invitees, agents, contractors, subcontractors, and/or representatives of Purchaser, claim KriStar is liable for negligence arising from the manufacture of its products, or if for any other reason a claim is made that KriStar has not fully satisfied its obUgations with respect to its products, KriSur's UabUity is Umited to an amount equal to two (2) times the original purchase price of KriStar's products proven to be defective, e.xclusive of any appUcable ta.xes. Purchaser hereby agrees to indemnify, defend and hold KriStar harmless in the event any third party brings a claim against KriStar relating to its products. Any claim for breach of this warranty must be submitted within one year from the date of original purchase and must be in writing, addressed to President, KriStar Enterprises, Inc., 422 Larkfield Center, Suite 271, Santa Rosa, CA 95403. Only a corporate officer (President, Vice President, or Corporate Secretary) of KriStar shall have the authority to modify' this warranty, and any such modification must be in writing and signed by Uie corporate officer, including reference to said officer's tifle, to be effective. If a dispute arises out of or relates to this Limited Warranty, or performance or breach thereof, KriStar and Purchaser agree first to try in good faith to resolve the dispute by mediation under the Commercial Mediation Rules published by the American Arbitration AssociaUon before resorting to arbitration. Thereafter, any remaining unresolved controversy or claim arising out of or relating to this Limited Warranty, or performance or breach thereof, shall be resolved by bindmg arbitration m accordance with the Commercial Arbitration Rules published by the American Arbitration Association, and shall be conducted in Santa Rosa, California. The sole Arbitrator shaU be a retired or former Judge familiar with commercial and construction matters. Judgment upon the award rendered by the Arbifrator may be entered in the Sonoma County court having jurisdiction thereof. Purchaser's initials: BEST MANAGEMENT PRACTICE (BMP) FOR THE REMOVAL OF PETROLEUM HYDROCARBONS FROM STORMWATER RUNOFF THROUGH THE USE OF CATCH BASIN FILTRATION SYSTEMS The Concept of Stormwater Catch Basin Filtration: Essentially, catch basin filtratioa is the placement of devices which contain a filtering medium (a'sorisent) just under the stormwater system's inlet (catch basin) grate. The runoff flows into the inlet, through the filter where the target contaminants are removed, and then into the drainage system. The devices must be capable of effectively filtering the first flush of a rain event and provide an overflow capability sufBcient to prevent the system from becoming clogged. The sorbent filter medium must be an inert blend of minerals that contains non-hazardous ingredients, as defined by the Federal EPA, OSHA and WHO (World Health Organization). Further, the medium should be non-leaching, contain no reactive chemicals, be non-carcinogenc, non-biodegradable, non-toxic, non- inflammable, non-injurious to asphalt, cement, carpet, tile, soil, or plant life. Contaminants: The primary target contaminant is petroleum hydrocarbons, to include most, ifnot all, oil- based products generated by motor vehicles powered by fossil ftiel or lubricated with any ofthe fossil fuel by-products. These include gasoline, oil, grease, some anti-freezes, and other such products plus other types of contaminants (i.e. heavy metals) that may become attached to the hydrocarbon. Current Technology: Of the catch basin filtration systems currently on the market that target petroleum hydrocarbons. Fossil Filter, a product of KriStar Enterprises of Cotati, California, is the most prominent. The Fossil FUter introduced a concept that was unique enough to qualify for a U.S. patent. Prior to the introduction of Fossil Filter, the leading technology for separating oil firom waler runoff was large underground precast concrete oil/water separators. They were expensive to purchase and install and could be used only on new construction projects. Because they were underground (and out of sight), inspection was very difficult and maintenance was expensive. Consequently, they were usually forgotten and any contaminants collected were left in the units to be flushed back into the drainage system by some future rain event. Fossil Filter, on the other hand, costs but a firaction of the concrete units to purchase and installation usually consists of removing the inlet grate, dropping the filter in place and replacing the grate. They can be used in both new and post-constmction projects; visual inspection is simple; and maintenance can be performed usually in a matter of minutes. Fossil Filter, for common size/shape inlets, is delivered as a one-piece "drop-in" unit. For unusual siza'shapes the filter can be fabricated to fit the inlet. They are available for square, rectangular, round and curiD or combination inlets as well as trench drains. According to the manufacturer, a device to fit most any situation is possible. (Rev 8/11/98) Device Construction: The catch basin filtration system structure should be constructed so as to cause the water to flow through the unit's filter medium and be of a fit that prevents leakage around the filter. To prevent corrosion and the release of oxidized metals into the system, the device's construction materials should be of high density polyethylene (HDPE), petroleum resistant fiberglass or stainless steel. The use of galvanized steel should not be allowed. The device should provide an overflow bypass area in its center with dimensions at least equal to 1/3 the inside dimensions ofthe catch basin. Recommended Effectiveness: Catch Basin Filtration Systems acceptable for installation should have, through appropriate laboratory or field testing, demonstrated a capability of removing petroleum hydrocarbons entering the inlet. Applicability Of Devices to EPA's NPDES and SWTPP's: The Federal EPA's NPDES program, designed to control the discharge of pollutants to waters ofthe United States, cites a definition of oil/water separator as "A device installed usually at the entrance to a drain, which removes oil and grease from water flows entering the drain. Catch Basin Filtration Systems acceptable for installation in petroleum hydrocarbon generating areas should fit the federal EPA's definition of oil/water separator (above). Fossil Filter meets the EPA description plus it meets the EPA mandate of BAT (Best Available Technology) while being "economically feasible". Based on the foregoing. Fossil Filter is suitable for inclusion as a BMP in local SWTPP's. Recommended Uses: Catch Basin Filtration Systems should be required for all locations where petroleum hydrocarbons are a major source of pollution to stormwater runoff and the water can be directed into a drainage inlet. Employee and customer parking lots, toll gates, service stations, aircraft and boat refueling areas are prime examples of such locations. The systems should be required for new construction and whenever a permit is issued to renovate or remodel an existing location. Inspection and Maintenance Procedures: Each inspection of the installed filtration systems should include a sweeping ofthe area suaounding the inlet, removal of the inlet grate, removal of trash and debris on top ofthe filter and a visual inspection of the filter and its installed material. Ifthe filter media is covered with silt, the media containers should be removed from the structure, the silt removed and the granules "stirred up". If the normally white granules appear to be more than 50% coated with a dark substance, the media should be replaced with new material. The media containers should then be re-installed, the inlet grate replaced and another broom cleanup completed. The e.xposed filter media should be placed in a DOT approved drum and disposed of in accordance with local agency requirements. (Rev. 8,'ll/98) Follow-On Maintenance: Because of past abuses of installed stormwater treatment devices, some governmental agencies within Califomia that accept Fossil Filter as a BMP for stormwater runoff are now requiring proof of a follow-on maintenance program. It is recommended that all agencies require proof of either a contractor maintenance program or that the landowner certify that they will provide maintenance. KriStar Enterprises, the ovvners of Fossil Filter, provides a comprehensive maintenance program that not only provides for maintenance of stonnwater filtration systems (to include other than Fossil Filter) but notifies the owner and the agency involved in wdting when maintenance has been performed. Limitations: The efficiency of any filtration system will be in direct proportion to the caliber of its maintenance program. A lack of care can be a limitation for any stormwater filtration system. Other system limitations must include unsuitable installation sites. The makers of Fossil Filter discourage installation of their product in areas that are subject to heavy silting, excessive tree leaves, trash or debris. Recommendations: 1. Catch Basin Filtration Systems such a Fossil Filter are recommended as a BMP for preventing pollution of stormwater runoff by petroleum hydrocarbons. 2. Recommend that all construction of new, and retrofit of e.xisting, areas subject to generation of petroleum hydrocarbons be surveyed as potential sites for installation of Catch Basin Filtration Systems. (Rev. 8/11/98) FILTRATION PROPER PROCESS DETAIL FILL HEIGHT DETAIL FOSSIL FILTER™ FLOWS FOSSIL ROCK™ FLOATS TO ALLOW FOR MIGRATION OF FINES (SILTS) V 0^<^ 0/) - u o-v7\ n 0 0 £7" V FOSSIL FILTER™ TOP SCREEN F FOSSIL ROCK™ FOSSIL ROCK™ ABSORBENT MATERIAL SHOULD REST APPROXIMATELY 1 1/2" BELOW TOP SCREEN WHEN PROPERLY FILLED FOR MAXIMUM EFFECTIVENESS. DO NOT OVERFILL. WALL MOUNTING DETAIL ORAJN INLCT GWTE DBAJN INLET FRAME CONCSflE WAR D8ILI HOl£ IN CONCSETE WALL TO ACCENT EXPANSION ANCHOR 3/y X 2- S3 BOLT OR!li HOLS IN R3SSIL Fimjr' RAi. fOR MOUNTING TO WAU. WTIHOVr RANGE ATTACHMENT 13 - SCHEDULE & COSTS FOR MAINTENANCE OF POST CONSTRUCTION BMPs ATTACHMENT 13 SCHEDULE & COST FOR MAINTENANCE STORMWATER MANAGEMENT PROGRAM BMPs SCHEDULE COST 1. INLET/OUTLET PROTECTION INSPECT TEMPORARY MEASURES PRIOR TO THE START OF THE RAINY SEASON. $100 PER EACH OUTLET/INLET PER EACH INSPECTION 2. STORM DRAIN SYSTEM & FILTERS DURING RAINY SEASON: A) INSPECT AFTER EVERY HEAVY RAINFALL B) ONCE PER WEEK INSPECT TEMPORARY MEASURES PRIOR TO THE START OF THE RAINY SEASON. $100 PER EACH UNIT PER EACH INSPECTION 3. LANSCAPING DURING RAINY SEASON: A) INSPECT AFTER EVERY HEAVY RAINFALL B) ONCE PER WEEK GRASS SHOULD BE CUT WHEN IT REACHES 6 INCHES. GRASS HEIGHT SHOULD BE MAINTAINED AT APPROXIMATELY 4 INCHES MAX. $200 PER MONTH PER 1000 SF INSPECT TEMPORARY MEASURES PRIOR TO THE START OF THE RAINY SEASON. $100 PER EACH OUTLET/INLET PER EACH INSPECTION DURING RAINY SEASON: A) INSPECT AFTER EVERY HEAVY RAINFALL B) ONCE PER WEEK ATTACHMENT 14 - CONSTRUCTION BMPs PLANS ATTACHMENT 15 - POST CONSTRUCTION BMPs PLANS