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CT 06-24; BRESSI RANCH VILLAGE CENTER; ADDENDUM TO STORM WATER MANAGEMENT PLAN; 2010-03-01
- - ,------------------------------------, BRESSI RANCH COMMERCIAL MAJOR BUILDING 'B' ADDENDUM TO STORM WATER MANAGEMENT PLAN FOR BRESSI RANCH PLANNING AREA 15 ~T06-24: :J CITY OF CARLSBAD, CA REC()RD COpy 'I _-C:._I~_'~~. ~i{~J PROJECT DESIGN CONSULTANTS I I I I I I I I I I I I I I I I I I I BRESSI RANCH COMMERCIAL MAJOR BUILDING 'B' ADDENDUM TO STORM WATER MANAGEMENT PLAN FOR BRESSI RANCH PLANNING AREA 15 CT 06-24 CITY OF CARLSBAD, CA MARCH 2010 Prepared For: LNR PROPERTY CORPORATION 4350 VON KARMAN AVE, SUITE 200 NEWPORT BEACH, CA 92660 Prepared By: PROJECT DESIGN CONSULTANTS Planning I Landscape Architecture I Environmental I Engineering I Survey Prepared by: C. Pack, P.E. Under the supervision of Job No. 3219.20 701 B .Street, SUIte 800 San Diego, CA 92101 619.235.6471 Tel 619.234.0349 Fax I I I I I I I I I I I I I I I I I I I 1. 2. 3. 4. 5. 6. TABLE OF CONTENTS INTRODUCTION ............................................................................................................... 1 PROJECT DESCRIPTION .................................................................................................. 2 POLLUTANTS AND CONDITIONS OF CONCERN ...................................................... 3 Anticipated and Potential Pollutants from the Project Area ................................................ 3 Conditions of Concern ......................................................................................................... 3 STORM WATER BEST MANAGEMENT PRACTICES ................................................ .4 LID Site Design BMPs ........................................................................................................ 4 Source Control BMPs .......................................................................................................... 5 BMPs Applicable to Individual Priority Development Project Categories ......................... 6 Structural Treatment BMPs ................................................................................................. 7 Selected Treatment BMP( s) ................................................................................................. 9 BMP Plan Assumptions ....................................................................................................... 9 PROJECT BMP PLAN IMPLEMENTATION ................................................................. 11 Construction BMPs ............................................................................................................ 11 Recommended Post-Construction BMP Plan .................................................................... 11 Operation and Maintenance Plans ..................................................................................... 12 PROJECT BMP COSTS AND FUNDING SOURCES .................................................... 13 II I I I I • I I I I I I I I I I I I I I TABLES Table 1. Anticipated and Potential Pollutants Generated by Land Use Type .................................. 3 Table 2. Priority Development Project BMPs ................................................................................. 6 Table 3. Structural Treatment Control BMP Selection Matrix ........................................................ 8 Table 4. Characterization of Pollutant Removal .............................................................................. 8 Table 5. BMP Design Criteria ....................................................................................................... 10 Table 6. BMP Costs ...................................................................................................................... 13 APPENDICES 1. Storm Water Standards Questionnaire 2. Project Maps 3. Supplemental BMP Information 4. Operation and Maintenance Plan III I I I I I I I I I I I I I I I I I I I 1. INTRODUCTION As part of the grading and building permit package, this Storm Water Management Plan (SWMP) was prepared to define recommended project Best Management Practice (BMP) options that satisfy the requirements identified in the following documents: • City of Carlsbad Standard Urban Storm Water Mitigation Plan, 2010 Storm Water Standards, • California Regional Water Quality Control Board, San Diego Region, Order No. R9- 2007-0001, NPDES No. CASOI08758, Waste Discharge Requirements for Discharges of Urban Runoff from the Municipal Separate Storm Sewer Systems (MS4s) Draining the Watersheds of the County of San Diego, the Incorporated Cities of San Diego County, the San Diego Unified Port District, and the San Dieg0 County Regional Airport Authority. Specifically, this report includes the following: • BMP design criteria and water quality treatment calculations; • Selected BMP options for the project; • BMP device information for the selected BMP options; and • Operation, maintenance, and funding for the selected BMPs. P:13219 20lENGRlREPORTSI WQTR13219.20SWMP .doc- - 1 - I I I I I I I I I I I I I I I I I I I 2. PROJECT DESCRIPTION This SWMP addendum has been prepared in support of a final engineering grading and building permit submittal for the Major Building 'B' in Bressi Ranch Commercial Planning Area 15. The rest of Bressi Ranch Commercial was previously constructed per Drawing 452-9A. The design for the Bressi Ranch Commercial project anticipated the future construction of Major Building 'B,' and the area for the future building was graded as a flat pad per that project. PDC prepared the SWMP for the entire site and the BMP sizing calculations assumed future development of Major Building 'B'. Refer to the Storm Water Management Plan: Bressi Ranch Planning Area 15, dated November 2007, submitted concurrently with this SWMP addendum for reference. Since this addendum supplements the November 2007 report, this addendum focuses only on the design of Major Building 'B.' For information regarding the previous project (and information that would be duplicated if included herein), refer to the approved November 2007 report. For example, refer to the 2007 report for downstream receiving waters and beneficial uses, since they are the same for this project as the previous project. The downstream BMP (Jensen Precast Interceptor) is currently treating (and will continue to treat) runoff from the Major Building 'B' site. The BMPs discussed in this addendum are only specific to the Major Building 'B' site, since the original SWMP documents the other site design, source control, and treatment control BMPs used elsewhere throughout Bressi Commercial Planning Area 15. The proposed site consists of a very small portion of the overall Planning Area 15 of Bressi Ranch. The proposed improvements are less than one acre and tie into the existing improvements that surround the site (per Sheet 7 of Drawing 452-9A). P:13219.20IENGRlREPORTSI WQTRI3219.20SWMP.doc -2- I I" I I I I I I I I I I I I I I I I I 3. POLLUTANTS AND CONDITIONS OF CONCERN Anticipated and Potential Pollutants from the Project Area Anticipated pollutants from the site under proposed conditions include sediment, nutrients, trash and debris, organic compounds, oil and grease, pesticides, oxygen demanding substances, and heavy metals. TABLE 1. ANTICIPATED AND POTENTIAL POLLUTANTS GENERATED BY LANI> USE TYPE General Pollutant Categories Project Trash Oxygen Bacteria Heavy Organic Oil & Categories Sediment Nutrients Metals Compounds & Demanding Grease & Pesticides Debris Substances ViJ;uses Commercial P(5) Development P(1) P(l) P(2) X peS) X P(3) Parking Lots P(l) pel) X X P(l) X P(l) Roadways X P(l) X X(4) X peS) X Notes for Table 1: (1) A potential pollutant if landscaping exists onsite. X = Anticipated Pollutant (2) A potential pollutant if the project includes uncovered parking areas. P = Potential Pollutant (3) A potential pollutant ifland use involves food or animal waste products. (4) Including petroleum hydrocarbons (5) Including solvents Source: "Table 2. Anticipated and Potential Pollutants Generated by Land Use Type," City of Carlsbad, Public Works Department, Standard Urban Storm Water Mitigation Plan, Storm Water Standards, A Manual for Construction & Permanent Storm Water Best Management Practices Requirements, April 2003, pg. 12 Conditions of Concern A drainage study was conducted by a California Registered Civil Engineer (RCE) to identify the conditions of concern for this project. The drainage calculations are available in a separate drainage report addendum. Following is the summary of findings from the study: '. Drainage Patterns: Existing condition runoff patterns are the same and are roughly equivalent to the patterns analyzed in the approved 2007 backbone drainage report. There is no expected adverse impact on downstream conditions. P:13219.20IENGRIREPORTSIWQTRI3219.20SWMP.doc - 3 - I I I I I I I I I I I I I I I I I I I 4. STORM WATER BEST MANAGEMENT PRACTICES The City Storm Water Standards Manual requires the implementation of applicable site design, source control, priority project requirements, and treatment control BMPs. LID Site Design BMPs The project addresses the site design BMPs required by the City Storm Water Standards as follows: • Maintain Pre-Development Rainfall Runoff Characteristics (BMP-I) o Minimize impervious footprint Streets, sidewalks, and parking lot aisles will be constructed to the minimum widths necessary, without compromising public safety. The proposed development includes landscaping areas where feasible to reduce project imperviousness. The proposed building footprint is much smaller than what was previously anticipated per the master Bressi Commercial project. o Conserve natural areas (BMP-2) -No natural areas to preserve. / o Minimize directly connected impervious areas (BMP-3) To the maximum extent practicable, drainage from rooftops will be discharge into landscaping prior to reaching the storm drain system. (See treatment BMP section). o Maximize canopy interception and water conservation 90nsistent with the Carlsbad Landscape Manual (BMP-4) P:13219 ,zOIENGRIREPOR lSI WQ:rR13219 .20SWMP.doc -4- I I I I I I I I I I I I I I I I I I I To the maximum extent practicable, native and drought-tolerant trees and large shrubs shall be planted instead of non-drought tolerant exotics. • Protect Slopes and Channels (BMP-5) -There are no significant existing slopes onsite. • Minimize Disturbances to Natural Drainages (BMP-9) -There are no natural drainages onsite. Source Control BMPs The project addresses the source control BMPs required by the City Storm Water Standards as follows: • Design Outdoor Materials Storage Areas to Reduce Pollution Introduction (BMP-l 0) o There are no proposed outdoor materials storage areas. • Design Trash Storage Areas to Reduce Pollution Introduction (BMP-ll) o Project does not propose any new trash storage areas. • Employ Integrated Pest Management Principles (BMP-12 and -13) o The need for pesticide use shall be reduced to the maximum ext~nt practicable by including pest-resistant or well-adapted native plant varieties and by distributing Integrated Pest Management (IPM) education materials to future site tenants. o Groundskeepers will be educated on pest management principles. • Use Efficient Irrigation Systems and Landscape Design o Rain shutoff devices shall be employed to prevent irrigation during precipitation, consistent with the Carlsbad Landscape Manual. (BMP-14) P;13219.20IENGRIR£PORTSI WQTR132I 9.20SWMP.doc - 5 - I I I I I I I I I I I I I I I I I I I o Irrigation systems shall be designed to each landscape area's specific water requirements, consistent with the Carlsbad Landscape Manual. (BMP-15) o Flow reducers and shutoff valves triggered by pressure drop will be used to control water loss from broken sprinkler heads or lines. (BMP-16) • Provide Storm Water Conveyance System Stenciling and Signage (BMP-17) o All storm water conveyance system inlets and catch basins within the project area shall be labeled, stamped, or stenciled with prohibitive language (such as: "NO DUMPING - I LIVE DOWNSTREAM") and graphical icons to discourage illegal dumping, as approved by the City of Carlsbad and to the satisfaction of the City Engineer. BMPs Applicable to Individual Priority Development Project Categories The City Storm Water Standards Manual requires specific BMPs if the project includes private roads, residential driveways and guest parking, dock areas, maintenance bays, vehicle and equipment wash areas, outdoor processing areas, surface parking areas, non-retail fueling areas, or steep hillside landscaping. The Major Building 'B' Project does include components that require project-specific BMPs. These components include dock areas, private roads, and surface parking areas. Table 2 addresses the individual priority project category BMPs required by City according to the Storm Water Standards. The applicability of each BMP for the Major Building. 'B' Project is noted in the table and is discussed in narrative form in the last column. TABLE 2. PRIORITY DEVELOPMENT PROJECT BMPs Included Specific BMP The design of private roadway drainage shall use at least one of the following: (1) rural swale system -street flows to vegetated swale or gravel shoulder, curbs at street comers, culverts under driveways and street crossin s; (2) urban curb/swale yes no j -6- Explanation of how BMP was included or why itw3s not included Roadside swales are inappropriate for . this project due to the commercial nature of the site. The precise grading of the site is extremely limited since it is a small site and it must tie into the existing grades built er the revious ro' ect. P:13219.20\ENGRIREPORTSIWQTR\3219.20SWMP.doc I I I I I I I I I I I I I I I I I I I system -street slopes to curb, periodic swale inlets drain to vegetated swalelbiofilter, or (3) dual drainage system -first flush captured in street catch basins and discharged to adjacent vegetated swale or gravel shoulder. Loading/unloading dock areas shall include the following: (1) cover loading dock areas, or design drainage to preclude urban run-on and runoff; and (2) An acceptable method of containment and j pollutant removal, such as a shut-off valve and containment area. Direct connections to storm drains from depressed loading docks (truck wells) are prohibited. Where landscaping is proposed in surface parking areas (both covered and uncovered), incorporate landscape areas into the drainage design. Overflow parking (parking in excess of the project's minimum parking requirements) should be constructed with permeable paving. Structural Treatment BMPs The precise grading of the site is extremely limited since it is a small site and it must tie into the existing grades built per the previous project. However, all runoff IS treated in existing downstream Jensen Storn1water· Interceptor. Permeable paving is not recommended. The precise grading of the site is j extremely limited since it is a small site and it must tie into the existing grades built per the previous project. The selection of structural treatment BMP options is determined by the target pollutants, removal efficiencies, expected flows, and space availability. Table 3 is a selection matrix for structural treatment BMPs based on target pollutants and removal efficiencies. P:13219.20IENGRIREPORTSI WQTRI3219.20SWMP.doc -7- I I I I I I I I I I I I I I I I I I I TABLE 3. STRUCTURAL TREATMENT CONTROL BMP SELECTION MATRIX Settling Infiltration Trash Basins Wet Facilities High-Racks & Bioretention (Water Ponds or High-rate Hydro Pollutants of Facilities Quality and Practices Media rate media -dynamic Concern (LID) Basins) Wetlands (LID) Filters biofilters filters Devices Coarse Sediment High High High High High High High High and Trash Pollutants that tend to associate with fine High High High High High Medium Medium Low particles during treatment Pollutants that tend to be Medium Low Medium High Low Low Low Low dissolved following treatment Source: "Table 4. Structural Treatment Control BMP Selection Matrix," City of Carlsbad, Public Works Department, Standard Urban Storm Water Mitigation Plan, Storm Water Standards, A Manual for Construction & Permanent Storm Water Best Management Practices Requirements, January 2010, pg. 16 Based on the target pollutants and typical removal efficiencies, the treatment BMP options to consider include all of the options in Table 3. Table 4 summarizes the pollutant removal mechanisms for the various pollutants. TABLE 4. CHARACTERIZA nON OF POLLUTANT REMOVAL Pollutants that tend Pollutants that to associate with tend Coarse fine particles to be dissolved Sediment during following Pollutant and Trash treatment treatment Sediment X X Nutrients X X Heavy Metals X Organic Compounds X Trash & Debris X Oxygen DemandinK X Bacteria X Oil & Grease X Pesticides X P:13219.20IENGRIREPORTS\ WQTR13219.20SWMP.doc -8- I I I I I I I I I I I I I I I I I I I Not all of these BMPs in Table 3 are feasible for this project. Taking into account the Watershed pollutants of concern, the proximity of the impaired water bodies, and the potential pollutants from the proposed development, the target pollutants for this project in order of general priority are sediment and attached pollutants and pesticides. Since no treatment control BMPs provides adequate removal efficiency for pesticides, the treatment BMP selection will be based on the remaining target pollutants. Source control BMPs will provide additional pollutant removal for the bacteria and pesticides in conjunction with the treatment control BMPs selected. Selected Treatment BMP(s) The Owner, Developer, and Project Team have selected to use Filterra roof drain biofiItration units to treat runoff from the roofiop. Note that a non-standard pre-cast unit will be used in order to fit a unit within the space constraints south of the proposed building. The runoff from the entire site will be treated downstream with the existing Jensen Precast Stormwater Interceptor. See Appendix 3 for additional treatment BMP information. BMP Plan Assumptions The following assumptions were made in calculating the required BMP sizes: • A runoff coefficient, 'C' value, of 1.0 was used in the runoff calculations for the project area per the manufacturer's specifications. (Note that drainage calculations assumed C=0.87 for entire site). • BMP Design Constraints • Locate outside public right-of-way • Facilitate access for maintenance • Avoid utility conflicts Table 5 summarizes the criteria that were implemented in the design of the recommended project . BMPs. P:\3219.20IENGRlREPORTSIWQTR\3219.20SWMP.doc - 9 - I I I I I I I I I I I I I I I I I I I BMP Hydrology C runoff coefficient I = water quality treatment intensity A = acreage Flow-based: Q=CIA TABLE 5. BMP DESIGN CRITERIA BMPOption BMPTreated Project Treatment Flow Capacity Criteria c= 1.0 Filterra Roof Drain 0.06 cfs (0.3 acre 1= 0.2 inlhour Biofiltration Vault max) A = 0.194 acres Q = 0.039 cfs P:1321 9.20IENGRIREPORTSIWQTRI32 19.20SWMP.doc -10- I I I I I I I I I I I I I I I I I I I 5. PROJECT BMP PLAN IMPLEMENTATION This section identifies the recommended BMP options that meet the applicable storm water and water quality ordinance requirements. This includes incorporating BMPs to minimize and mitigate for runoff contamination and volume from the site. Construction BMPs During construction, BMPs such as silt fences, sand bags, gravel bags, fiber rolls, and other erosion control measures may be employed consistent with the City of Cfl,rlsbad Tier 2 Storm Water Pollution Prevention Plan (SWPPP). Note that permit coverage per the General Construction Permit is not required since the site disturbance is less than 1 acre. The objectives of the Tier 2 SWPPP are to: • Identify all pollutant sources, including sources of sediment that may affect the water quality of storm water discharges associated with construction activity from the construction site; • Identify non-storm water discharges; • Identify, construct, implement in accordance with a time schedule, and maintain BMPs to reduce or eliminate pollutants in storm water discharges and authorized non-storm water discharges from the construction site during construction; and • Develop a maintenance schedule for BMPs installed during construction designed to reduce or eliminate pollutants after construction is completed (post-construction BMPs). Recommended Post-Construction BMP Plan PDC has identified a recommended water quality BMP plan for the Major Building 'B' Project. P:132 I 9.20IENGRlREPORTSIWQTRI32 I 9.20SWMP.doc -11 - I I I I I I I I I I I I I I I I I I I The recommended post-construction BMP plan includes LID site design, source control" and treatment BMPs. The site design BMP options include reduction of impervious surfaces, minimization of directly connected impervious areas, and water conservation. The source control BMPs include inlet stenciling and signage, efficient irrigation, and integrated pest management principles. The treatment BMP selected for this project is one proposed Filterra Roof Drain Biofiltration Vault. All runoff will be treated via the existing Jensen Precast Storm water Interceptor per the previous Bressi Commercial project. Operation and Maintenance Plans The City Municipal Code requires a description of the long-term maintenance requirements of proposed BMPs and a description of the mechanism that will ensure ongoing long-term maintenance. Operation and maintenance plans for the recommended post-construction BMP for this project are located in Appendix 4. The Project BMP costs and the maintenance funding sources are provided in the following section. P:\3219.20IENGRIREPORTSIWQTR\3219.20SWMP.doc -12- I I I I I I I I I I I I I I I I I I I 6. PROJECT BMP COSTS AND FUNDING SOURCES Table 6 below provides the anticipated capital and annual maintenance costs for the selected BMPs. TABLE 6. BMP COSTS BMPOPTION Estimated Capital Costs Approximate Annual Maintenance Costs Filterra Roof Drain Biofiltration Vault $12,500 + installation $500-$1,000 (FTRD 8x3) The Developer will incur the capital cost for the BMP installation. The responsible party for long-term maintenance and funding is the Property Management Association. P:13219.20IENGRlREPORTSI WQTR13219.20SWMP.doc -13 - I I I I I I I I I I I I I I I I I I I APPENDIX 1 Storm Water Standards Questionnaire I I I I I I I I I I I I I I I I I I I «~~ ~ CITY OF CARLSBAD STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Engineering Department 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov INSTRUCTIONS: .1 This questionnaire must be completed by applicant in advance of submitting for a development application (subdivision and land USfil planning approvals and construction permits). The results of the questionnaire determine the level of storm water pollution prevention standards applied to a proposed development or redevelopment project. Many aspects of project site design are dependent upon the storm water pollution protection standards applied to a project. Applicant responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. A staff determination that the development application is subject to more stringent storm water standards than initially assessed by the applicant. will result in the return of the development application as incomplete. If applicants are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, they are advised to seek assistance from Land Development Engineering staff. A separate completed and signed questionnaire must be submitted for each new development application submission. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. In addition to this questionnaire, applicants for construction permits must also complete. sign and submit a Construction Activity Storm Water Standards Questionnaire. To address pollutants that may be generated from new development, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project deSign, which are described in Section 2 of the city's Storm Water Standards Manual ,(his questionnaire should be used to categorize new development and significant redevelopment projects as priority or non-priority, to determine what level of storm water standards are required or if the project is exempt. I 1. Is your project a significant redevelopment? Definition: Significant redevelopment is defined as the creation or addition of at least 5,000 square feet of impervious surface on an already developed site. Significant redevelopment includes, but is not limited to: the expansion of a building footprint; addition to or replacement of a structure; structural development including an increase in gross floor area andlor exterior construction remodeling; replacement of an impervious surface that is not parl of a routine maintenance activity; and land disturbing activities related with structural or impervious surfaces. Replacement of impervious surfaces includes any activity that is not parl of a routine maintenance activity where impervious material(s) are removed, exposing under/ying soil during construction. Note: If the Significant Redevelopment results in an increase of less than fifty_percent of the impervious surfaces of a previously existing development, and the existing development was not subject to SUSMP requirements, the numeric sizing criteria discussed in Table 3 of 2.3.3.4 applies only to the addition, and not to the entire development. 2. If your project IS considered significant redevelopment, then please skip Section 1 and proceed with Section 2. 3. If your project IS NOT considered significant redevelopment, then please proceed to Section 1. E-34 Page 1 of3 REV 1/22110 L I I I I I I I I I I I I I I I I I I I «~""" .... .;tit~." ....... :r-/' ¥ CITY OF CARLSBAD STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Engineering Department 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov SECTION 1 NEW DEVELOPMENT PRIORITY PROJECT TYPE YES NO Does your project meet one or more of the following criteria: 1. Home subdivision of 100 units or more. X Includes SFD, MFD, Condominium and Apartments - 2. Residential development of 10 units or more. >< Includes SFD, MFD, Condominium and Apartments 3. Commercial and industrial development greater than 100,000 sg,uare feet including e.arking areas. Any development on private land that is not for heavy industrial or residential uses. Example: Hospitals, Hotels, X Recreational Facilities, Shoppina Malls, etc. 4. Heavy Industrial/Industry greater than 1 acre (NEED SIC CODES FOR PERMIT BUSINESS TYPES) X SIC codes 5013,5014,5541,7532-7534, and 7536-7539 5. Automotive repair shop. >< SIC codes 5013, 5014, 5541, 7532-7534, and 7536-7539 6. A New Restaurant where the land area of devel0l2.ment is 5,000 square feet or more including parking areas. X SIC code 5812 7. Hilfside development (1) greater than 5,000 square feet of impervious surface area and (2) development will grade on any natural >< slope that is 25% or greater 8. Environmentally Sensitive Area (ESA). Impervious surface of 2,500 square feet or more located within, "directly adjacent,,2 to (within 200 feet), or >< "discharging directly to·3 receiving water within the ESA 1 9. Parking lot. X Area of 5,000 square feet or more, or with 15 or more parking spaces, and potentially exposed to urban runoff 10. Retail Gasoline Outlets -serving more than 100 vehicles Qer day. X Serving more than 100 vehicles per day and greater than 5,000 square feet 11. Streets, roads, hiQhways, and freeways. X Project would create a new paved surface that is 5,000 square feet or greater. 12. Coastal Development Zone. X Within 200 feet of the Pacific Ocean and (1) creates more than 2500 square feet of impermeable surface or (2) increases impermeable surface on property by more than 10%. 13. More than 1-acre of disturbance. Project results in the disturbance of more than 1-acre or more of land and is considered a Pollutant-generating Devel~ment ProjE;lct4• X 1 Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) Impaired water bodies; areas designated ~ Areas of'Special Biological Significance by the State Water Resources Control Board (Water QuaUty Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Waler Quality Control Plan for the San Dlesq Basin (1994) lind amendments); areas deSignated as preserves or their equivalent under the MulU Species Conservation Program within the CiUes and County of San'Dlego; and any other equivalent environmentally sensitive areas which have been IdenUfied by the co-permittees. 2 "Directly ad'J8cent" means situated within 200 feet of the Environmentally SenslUve Area. 3 ·Discharglng directly to" means outflow from a drainage conveyance system that Is composed entlrely of flows from the subject development or redevelopment site, and not commingled with flow from adjacent lands • .. Pollutant·generatlng Development Projects are those projects that generate pollutants at levels greater than background levels. In general, these Include all projects that contribute to an exceedance to an Impaired water body or which create new impervious surfaces greater than 5000 square feet andlor Introduce new landscaping areas that require routine use of fertilizers and pesticides. In most cases linear pathway projects that are for Infrequent vehicle use, such as emergency or maintenance access, or for pedestrian or bicycle use, are not considered Pollutant-generaUng Development Projects If they are built with pervious surfaces or if they sheet now to surroundln ervlous surfaces. Section 1 Results: If you answered YES to ANY of the questions above you have a PRIORITY project and PRIORITY project requirements DO apply. A Storm Water Management Plan, prepared in accordance with City Storm Water Standards, must be submitted at time of application. Please check the "MEETS PRIORITY REQUIREMENTS· box in Section 3. If you answered NO to ALL of the questions above, then you are a NON-PRIORITY project and STANDARD reqUirements apply. Please check the "DOES NOT MEET PRIORITY REQUIREMENTS· box In Section 3. E-34 Page 20f3 REV 1/22110 I I I I I I I I I I I I I I I I I I I «~~ ~ CITY OF CARLSBAD STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Engineering,Department 1635 Faraday Avenue 160-602-2750 www.carlsbadca.gov M ~ SECTION 2: SIGNIFICANT REDEVELOPMENT Complete the questions below regarding your redevelopment project YES NO 1. Project results in the disturbance of more than i-acre or more of land and is considered a Pollutant-generating Development Project (see definition in Section 1) If you answered NO, please proceed to question 2 . . If you answered YES, then you ARE a significant redevelopment and you ARE subject to PRIORITY project requirements. Please check the "MEETS PRIORITY REQUIREMENTS" box in Section 3 below. 2. Is the project redeveloping an existing priority project type? (Priority projects are defined in Section 1) If you answered YES, please proceed to question 3. If you answere!=! NO then you ARE NOT a significant redevelopment and you ARE NOT subject to PRIORITY project requirements, only STANDARD requirements. Please check the "DOES NOT MEET PRIORITY REQUIREMENTS" box in Section 3 'below. 3. Is the project solely limited to one of the followinQ: a. Tren'ching and resurfacing associated with utility work? b. Resurfacing and reconfiguring existing surface parking lots? c. New sidewalk construction, pedestrian ramps, or bike lane on public andforj)rivate existingroads? d. Replacement of existing damaged pavement? If you answered NO to ALL of the questions, then proceed to question 4. If you answered YES to ONE OR MORE of the questions, then you ARE NOT a significant redevelopment and you ARE NOT subject to PRIORITY project requirements, only STANDARD requirements. Please check the 'DOES NOT MEET PRIORITY REQUIREMENTS· box in Section 3 below. 4. Will the development create, replace, or add at least 5,000 square feet of imperVious surfaces on an existing development, or be located within 200 feet of the Pacific Ocean and (1) create more than 2500 square feet of impermeable surface or (2) increase impermeable surface on property by more than 10%? If you answered YES, you ARE a significant redevelopment and you ARE subject to PRIORITY project requirements. Please check the "MEETS WITH REQUIREMENTS" box in Section 3 below. , If you answered NO, you ARE NOT a significant redevelopment, and you ARE NOT subject to PRIORITY project requirements, only STANDARD requirements. Please check the 'DOES NOT MEET PRIORITY REQUIREMENTS" box in Section 3 below. .. I SECTION 3 Questionnaire Results: .)s( MY PROJECT MEETS PRIORITY REQUIREMENTS. MUST COMPLY WITH PRIORITY PROJECT STANDARDS AND MLisT PREPARE A STORM WATER MANAGEMENT PLAN FOR SUBMITTAL AT TIME OF APPLICATION. o MY PROJECT DOES NOT MEET PRIORITY REQUIREMENTS AND MUST ONLY COMPLY WITH STANDARD STORM WATER REQUIREMENTS. A Jicanl Information and Si nature Box Address: ~: \2.:l~ Col>\~r<:.i Assessor's Parcel Number(s): B.J!.t: 'Z-13-{Q/-1.J-OO This Box for City_ Use Onl City Concurrence: LYe's I- l,3y: Applicant'Name: ~ I~"" PA'J Applicant Title: l..Nn.. <:"11 lS1t&os1 'R.e"~I\"', I.,.\...<" j'lC o:2I!:c..1 ""'A""A~R. Applicant Signature: Date: Date: Project 10: E-34 Page 3 of3 REV 1/22110 No I I I I I I I I I I I I I I I I I I I APPENDIX 2 Project Maps I I I I I I I I I I I I I I I I I I I CITY OF OCEANSIDE PACIFIC OCEAN /8 CITY OF ENCINITAS VICINITY MAP NOT TO SCALE I I I I I I I I I I RECEIVED I MAR 09 2010 ENGINEERING I DEPARTMENT I I I I I I I I I I APPENDIX 3 Supplemental BMP Information I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I - Filterra® Roofdrain Sy~tem The Filterra Roofdrain System treats piped in stormwater runoff from rooftops. Using bioretention filtration the system captures and immobilizes pollutants of concern such as; TSS, nutrients and metals. Stormwater continues to flow through the media and into the underdrain system, where treated water is discharged. Higher flows bypass the bioretention treatment via an overflow/bypass pipe design. Features and Benefits Best Value-for Rooftop Treatment. • compact size • needs no external bypass • easy installation • simple maintenance Versatile. Filterra Roofdrain can be used for: • new construction • retrofits • commercial or residential applications. Filterra Roofdrain can be placed: • Atgrade • Slightly above grade to meet elevation challenges of high water tables • Install next to or away from your building Maintenance. Maintenance is simple and safe (at ground level), and the first year is provided FREE with the purchase of every unit. The procedure is so easy you can perform it yourself. Protection. The Filterra Roofdrain's hydraulic configuration was tested"by the Colorado State University Hydraulics laboratory. Below grade treatment using Filterra roofdrain avoids the slipping hazard liabilities of daylighted roofdrains during freezing weather. Protect from erosion with Filterra's monolithic water tight design. fi lterra Bioretention Systems ., I, I(}'''II' I hit'? ':1 -;",ltU~n~'rlf"'J rllll'-llIoli FilterraO Roofdrain StormwaterTreatment System A Greenroof at Ground Level~ Expected Pollutant Removal (Ranges Varying with Particle Size, Pollutantloading and Site Conditions) TSSRemoval 85% Phosphorus Removal 60%-70% Zinc Removal >66% Copper Removal >58% Nitrogen Removal 42%--45% TPW Removal >93% lotal Petroleum Hydrocarbons Information on the pollutant removal efficiency of the filter soil/plant media is based on third party lab and field studies. Filterra media has beentAPE and TARPtested and approved. 1. Influent Pipe from Roof leader 2. Erosion Control Device 3. Protective Mulch layer 4. Perforated Underdrain for Treatment Flows 5. Cast Iron Tree Grate-for Maintenance Access I I I I I I I I I I I I I I I I I I I Design Guidelines 1) Use the Filterra Roofdrain Design Guidance as a reference available from design@filterra.com. 2) Select Filterra Roofdrain model according to your Regional Sizing Table, and according to the building's roof drainage area and associated roof drain pipe sizes. 3) Determine Filterra Roofdrain Placement next to a building, or away from your building. 4) Ensure piping to and from Filterra Roofdrain system is free-draining at minimum 1% slope, or per local codes. Placement Review Because we want your project with Filterra to be a great success, we respectfully require that each Filterra Roofdrain project be reviewed by our placement/design staff. This review is mandatory, as proper placement ensures you of the most efficient and cost effective solution, as well as optimum performance and minimal maintenance Proper Placement 1) Pipe flow of the Filterra Roofdrain System eliminates the cross- linear flow requirements necessary with standard Filterra. 2) Filterra Roofdrain Systems should only receive piped in runoff. 3) Rooftop drainage should still be designed with emergency bypass relief prior to the Filterra Roofdrain System (e.g.: rooftop scuppers, etc.) Always follow local plumbing codes for roof drainage requirements. The Filterra System is not a substitute for rooftop overflow/bypass. 4) Send completed project information form along with plans to Filterra for placement and application review. fHterra Bioretention Systems tll~IOWI!lI/ UiZ't11ll .... li'Ull~'~h)1 fllll.1ll1)11 FilterraO Roofdrain StormwaterTreatm~nt System A Greenroof at Ground Leveln • Filterra Roofdrain System One pipe in, one pipe out, with internal ~igh"f1owbypass. Western Region Support 34428Yucaipa Blvd., SUite E-312 Yucaipa, CA 92399 Corporate Headquarters· & Eastern Region Support 11352Virginia Precast Road Ashland, VA 23005 Toll Free: (866) 349-3458 • F: (804) 798-8400 E-mail: design@filterra.com • Web: www.filterra.com Fllterra' is protected by U.s. Patents "6,277,274, #6,569,321 & 7,625,485. Other patents pending. Filterra~ IS a diviSion of I I I I I I I I I I I I I I I I I I I Sizing Filterra Roofdrain System Design Guidelines ~ fitterra- Identify the maximum contributing drainage area to each Filterra Roofdrain unit and compare to the Regional Sizing Table for the project's location. The Filterra's filter surface area will be sized according to local regulations for water quality treatment. Identify the maximum expected flow for the ordinary roof drain piping. This is often the Q10 storm, but may vary according to location and local plumbing codes. This flow rate will determine the influent and effluent pipe size of the Filterra Roofdrain system (between 6-inch and 10-inch diameter). Placement Determine an appropriate location for the Filterra Roofdrain system, according to elevation available on site, site layout and aesthetics. The Invert Out depth of a Filterra Roofdrain system may be calculated by adding 3.5 feet to the influent pipe size. For example a 6'x4' Filterra Roofdrain system with 6-inch influent pipe will have a Top of Slab to INV OUT height of 4.0 feet. It is possible to have the top of the Roofdrain system above grade to help with challenging elevations on site, although at minimum, the effluent pipe from the system should be below grade. The Filterra Roofdrain top slab is not designed to be traffic loaded and so should be placed accordingly. The system is not designed to act as a yard drain/grated inlet through the tree grate; please design for piped in runoff only. The system should be designed and installed plumb and level. Piping Ensure piping to and from Filterra Roofdrain system is free-draining at minimum 1 % slope, or per local codes. Please refer to the Filterra drawing FTRD-IPC that shows available inlet piping configurations and model numbers. At minimum, the effluent pipe from the system should be below grade. An emergency bypass relief must be incorporated into the roofs drainage design, upstream of the Filterra Roofdrain system. For example a 'wye' on the downspout is often used. This element should be in addition to the standard code design of rooftop overflow, such as scuppers or a secondary piping system. Always follow local plumbing codes for roof drainage requirements. The Filterra System is not a substitute for rooftop overflow/bypass. Placement Review Because we want your project with Filterra to be a great success, we respectfully r~quire that each Filterra Roofdrain project be reviewed by our placement/design staff. This review is mandatory, as proper placement ensures you of the most efficient and cost effective solution, as well as optimum performance and minimal maintenance. Please send completed project information form along with plan sheets (storm layout, drainage areas, profile etc) to Filterra for placement and application review. Methods of sending information for review are as follows: Email: design@filterra.com AutoCAD or PDF files Fax: (804) 798-8400 FTP Site: contact Filterra for details Mail or other: Americast -Filterra Review 11352 Virginia Precast Road Ashland, Virginia 23005 www.fiIterra.com I I I I I I I I I I I I I I I I I I I filterra 1\ Growing Idea In Stonnwaler Fibration. Table 2: Filterra® Roofdrain (FTRD) Standard Sizing Table (where C = 1.0) Southern California ONLY -(0.2 in/hr Uniform Intensity Approach) Available Filterra® Total Contributing Bypass Pipe Size I Roofdrain Box Sizes (feet) Drainage Area (acres) Max. Flow (cfs) FTRD 4x4 up to 0.19 6" PVC 11.15 cfs FTRD 6.5x4 0.20 to 0.30 6" PVC 11.15 cfs or 8" PVC 1 2.25 cfs FTRD 8x4 0.31 to 0.37 6" PVC 11.15 cfs or 8" PVC 1 2.25 cfs FTRD 12x4 0.38 to 0.56 6" PVC 11.15 cfs or 8" PVC 1 2.25 cfs 6" PVC 11.15 cfs or FTRD 6x6 0.38 to 0.42 8" PVC 1 2.25 cfs or 10" PVC 13.80 cfs 6" PVC 11.15 cfs or FTRD 8x6 0.38 to 0.56 8" PVC 1 2.25 cfs or 10" PVC 1 3.80 cfs 6" PVC 11.15 cfs or FTRD 10x6 0.57 to 0.70 8" PVC 1 2.25 cf~ or 10" PVC 1 3.80 cfs 6" PVC 11.15 cfs or FTRD 12x6 0.71 to 0.83 8" PVC 12.25 cfs or 10" PVC 1 3.80 cfs Notes: 1. All boxes are a standard 3.5 feet depth (INV to TC), plus the depth of bypass pipe, e.g. FTRD -6.5x4 unit with 8" pipe has INV to TC = 4.17' (FTRD 6.5x4 -8) 2. A standard PVC pipe coupling is cast into the box wall for simple connection. 3. Size dimensions shown are internal. Please add l' to each for external (using 6" walls) 4. For Commercial Developments a minimum (runoff coefficient) C factor of 0.85 is required. Most roof drain application require use of C = 1.0 or C = 0.95 5. Please ask for Sizing Tables for other target treatment goals, e.g. 0.3 inlhr 1-27-10 I v01 www.filterra.com Toll Free: (866) 349-3458 I I I I I I I I I I I I I I I I I I I I AVAILABLE PIPE CONFIGURATION A BOX SIZE X Y AVAILABLE r1 PIPE SIZE --B "1-' 1 FTRD 4X4 4' 4' 6" -+-X--r I L ::1-- --c EXAMPLE MODEL #: FTRD 4X4-6A 0 t PLAN VIEW AVAILABLE PIPE , CONFIGURATION BOX SIZE X Y AVAILABLE A PIPE SIZE = : tr----~--· ----jr-FTRD 6.SX4 6'-6" 4' 6", 8" FTRD 8X4 8' 4' 6", 8" FTRD 12X4 12' 4' 6", 8" 0 t PLAN VIEW EXAMPLE MODEL #: FTRD 8X4-88 . , AVAILABLE PIPE CONFIGURATION BOX SIZE X Y AVAILABLE A PIPE SIZE FTRD 6X6 6' 6' 6", 8", 10" -B x FTRD 8X6 8' 6' 6", 8", 10" p-y --FTRD 10X6 10' 6' 6", 8", 10" ./" FTRD 12X6 12' 6' 6", 8", 10" ,- //// -C. r-------.-;' LJ MODEL #: 0 PLAN VIEw EXAMPLE FTRD 12X6-10D t ENGINEER TO SPECIFY ONE (1) INLET PIPE LOCATION (A, B, C, OR D). A PVC COUPUNG WILL BE CAST INTO THE WALL (BY AMERICAST) FOR FIELD CONNECTION (BY CONTRACTOR) MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DATE: 01-20-10 I DWG: SOCAl FTRD IPC-1 • ~aJr&[f]D@~ FILTERRA® ROOFDRAIN PVC . nU~Tr©f INLET PIPE COUPLING LOCATIONS SOUTHERN CALIFORNIA REGI.ON us PAT 6,277,274 Copyright C 2007 by Americast AND 6,569,,321 " I I I I I I I I I I I I I I I I I I I Co 6"1 I 8'-0" ---II r-6" A L • o 1 I'<) - ,-----------------------------. r-------------------------------, I I -------------------I I I I I I ............ I ---L~.J.. .... I ........ ""ll" 'tQn-__ ---------------~-II I ~-------------------:3::1 '1 - I I I I I I I I L _______________________________ ~ ~ • <D PLAN VIEW CLEANOUT COVER CAST IN TOP SLAB PVC PIPE (BY CONTRACTOR) CL o • l-I'<) 10 -I-~ > z TREE FRAME & GRATE CAST IN TOP SLAB MULCH PROVIDED BY AMERICAST PERFORATED UNDERDRAIN SYSTEM BY AMERICAST UNDERDRAIN STONE PROVIDED BY AMERICAST MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FlLTERRA SECTION A-A PLANT AS SUPPLIED BY AMERICAST (NOT SHOWN FOR CLARITY) TOP SLAB FILTERRA TAPE/TARP APPROVED MEDIA PROVIDED BY AMERICAST - PVC PIPE (BY CONTRACTOR) DRAWING AVAIlABLE IN TIF FILE FORMAT. j-D_A_JE_: __ 0_3-_0_1-_1 O_----'-_DW_G_: _FT_R_D_B_X_3_B_B_---j-. ' 8x31 PRECAST FIL TERRA® UNIT .jf~.~ ~@(f'(f'5)O.-, Copyright CI 2007 by Americas! ROOF DRAIN CONFIGURATION ~ uK~~u U(Q! WITH 811 PVC PIPED IN US PAT 6.277.274- AND 6.569.321 I I I I I I I I I I I I I I I I I I I APPENDIX 4 Operation and Maintenance Plan I I I I I I I I I I I I I I I I I I I Maintenance ~ filterra Simple maintenance of the Filterra® is required to continue effective pollutant removal from stormwater runoff before discharge into downstream waters. This procedure will also extend the longevity of the living biofilter system. The unit will recycle and accumulate pollutants within the biomass, but is also subjected to other materials entering the throat. This may include trash; silt and leaves etc. which will be contained within the void below the top grate and above the mulch layer. Too much silt may inhibit the Filterra's® flow rate, which is the reason for site stabilization before activation. Regular replacement of the mulch stops accumulation of such sediment. Americast includes a I-year maintenance plan with each system purchase. Annual maintenance consists of a maximum of two (2) scheduled visits. The start of the maintenance plan begins when the system is activated for full operation. Full operation is defined as the unit instailed, curb and gutter and transitions in place and activation (by Supplier) when mulch and plant are added and temporary throat protection removed. Activation cannot be carried out until the site is fully stabilized (full landscaping, grass cover, final paving and street sweeping completed). Maintenance visits are scheduled seasonally; the spring visit aims to clean up after winter loads including salts and sands. The fall visit helps the system by removing excessive leaf litter. Some sites may be subjected to extreme sediment or trash loads, requiring mote frequent maintenance visits. This is the reason for detailed notes of maintenance actions per unit, helping the Supplier and Owner predict future maintenance frequencies, reflecting individual site conditions. Owners must promptly notify the (maintenance) Supplier of any damage to the plant(s), which constitute(s) an integral part of the bioretention technology. Owners should also advise other landscape or maintenance contractors to leave all maintenance to the Supplier (i.e. no pruning or fertilizing). Exclusion of Services It is the responsibility of the owner to provide adequate irrigation year around to the plant of the Filterra® system. Clean up due to major contamination such as oils, chemicals, toxic spills, etc. will result in additional costs and are not covered under the Supplier maintenance contract. Should a major contamination event occur, the Owner must block off the outlet pipe of the Filterra® (where the cleaned runoff drains to, such as drop-inlet) and block off the throat of the Filterra®. The Supplier should be informed immediately. 12139104 www.filterra.com I I I I I I I I I I I I I I I I I I I Extended Maintenance Contracts ~ fi lterrd' Extended maintenance contracts are available from the Supplier. Contact Americast for details and pricing. Maintenance Visit Summary Each maintenance visit consists of the following simple tasks (detailed instructions below). A. Filterra® unit inspection B. Foreign debris, silt, mulch & trash removal C. Filter media evaluation and recharge as necessary D. Plant health evaluation and pruning or replacement as necessary E. Replacement of mulch F. Disposal of all maintenance refuse items G. Maintenance records updated and stored (reports available upon request) Maintenance Tool List Ideal tools include a camera, gloves, bucket, shovel, broom, pruners, hoe/rake and tape measure. Most visits require only replacement mulch. Three bags of shredded hardwood mulch are used per unit (on a standard 6x6' size). Some visits may require additional Filterra® engineered soil media available from the Supplier. Maintenance Visit Detail A. Filterrai!2 unit inspection 12129104 Record individual unit before maintenance with photograph (numbered). Record on Maintenance Report (see example in this document) the following: Standing Water YIN Damage to Box Structure YIN Damage to Grate YIN Is Bypass Clear YIN Notes If yes answered to any of these observations, record with close-up photograph (numbered). www.fiiterra.com POOR QUALITY ORIGINAL S I I I I I I I I I I I I I I I I I I I B. 12115104 Foreign debris, silt, mulch & trash removal filtBrra· Remove metal grates for access into Filterra® box. Remove the mesh that protects the mulch layer, taking care to avoid damage to the mesh and the plant. Dig out silt (if any) and mulch and remove trash & foreign items. www.filten·a.com I I I I I I I I I I I I I I I I I I I c. D. j filterra- Record on Maintenance Report the following: Silt / Clay YIN Cups / Bags YIN Leaves YIN # Buckets Removed # Notes Filter media evaluation and recharge as necessary After removal of mulch and debris, measure distance from the top of the Filterra® engineered media soil to the bottom of the top slab. If this distance is greater than 12", add Filterraq 1) media (not top soil or other) to recharge to a 9" distance. Record on Maintenance Report the following: Distance to Bottom of To Slab (inches Buckets of Media Added # Plant health evaluation and pruning or replacement as necessary Examine the plant's health and replace if dead. www.filterra.coll1 I I I I I I I I I I I I I I I I I I I E. F. G. 12i 15'(}4 Record on Maintenance Report the following: Height above Grate (feet) Width at Widest Point (feet) Health AlivelDead Damage to Plant YIN Plant Replaced YIN Notes Replacement of Mulch Add shredded hardwood mulch across the entire unit to a depth of3". Replace the protective mesh carefully over the plant. Ensure correct position of erosion control stones by the Filterra® inlet. Replace Filterra"j, grates correctly. Disposal of all maintenance refuse items filterrao Clean area around unit and remove all refuse to be disposed of appropriately. Maintenance records updated and stored (reports available upon request) Deliver Maintenance Report and· photographs to appropriate location (normally Amcricast during maintenance contract period). Some jurisdictions may require submission of maintenance reports in accordance with approvals. It is the responsibility of the Owner to comply with local regulations. www.filterra.com 1 I I I ,I 1 1 I I I - I I I I I I I I Filterra® Project Maintenance Order Project Address Directions Project Owner Company Contact Name Telephone # Filterra Units on this Order Total Units on this Project 12114104 I I I I I I I I I I I I I I I I I I I Filterra® Structure Maintenance Report Project Plant Type Standing Water I£;{~;l~t~i4:~m~~ IF Yes, STOP NOW & call 804-798-6068 Damage to Box Structure ~:;~~~Y:~:S3t1mN.:Qi~~ If YES to an observation take close up photo Silt / Clay Cups/Bags Leaves Other Distance to Bottom of Top Slab (in.) Buckets of Media Added (# of) Netting Replaced Stones Replaced Height above Grate (feet) Width at Widest Point (feet) Health Ali e take close up hoto Other Notes (use back if necessary) ad Structure Number Structure Size Damage to Grate Is Bypass Clear Notes Buckets Removed (# of) Notes Notes Bags of Mulch Added (# of) Notes Plant Replaced Notes 12114104 «, , , , " < •• , . " ,-, i" .<", -:: \~ '. <': EXISllNG BLDG 4, -",L "L. < , < " , I ,,' <' L , . -L. l.- , <, , • < Ci27 0 , " • ",L --~ < , , .' • + , I -'1'----I --"---__ 1\1_ --_Ij-- --'1'--'1'-- 1--'1'----,1'-- = P: \J2J9.20\ENG1'\R~1S\W01R\J2'9.2OOMP-si4ep/oo.d'J119 8:OJ:S6 Ail 0:.19 AV CURB INLET /pR. GRATE INLET BLDG FOOTPRINT - U I I - II H Ik " '-U/(AINAV't AREA PER ARCHITECT TO ROOF COLLECTION SYSTEM AND FlL TERRA BMP UNIT "8" C~~'J:~~IN U AREA I / 0: / 0: / / / / / 0: / / I / I -- EXISllNG BLDG IM'-FLIB f'A ROOF / ~/ / ~/ / / / I 1/ -- I I 11\ I .-/ .-/ z • . , , I: < / / / .. j " . , < , / . , " , .. < < / I,' .,-, b?' j., i:< , , " '" . i , , ' o / " IYND GR~fft~~~~~~~=,,=~ DETENTION BASIN , __ , SCALE: 1"=20' JOB #: 3219.20 CREA TED: 1/26/10 --------- PREPARED BY: PROJECT DESIGN CONSULTANTS Planning I Landscape Architecture r Environmental I Engineering r Survey 701 B Street, Suite 800 619.235.6471 Tel San Diego, CA 92101 619.234.0349 Fax • " NOTES: POST-CONSTRUCTION BMPs THE RECOMMENDED POST-CONSTRUCRON BMP PLAN INCLUDES UD SITE DES/GN, SOURCE CONTROL, AND TREA TMENT BMPS. THE SITE DES/GN BMP OPRONS INCLUDE REDUCRON OF IMPERVIOUS SURFACES. MINIMIZARON OF DIREC1L Y CONNECTED IMPERVIOUS AREAS. AND WA TER CONSERVA RON. THE SOURCE CONTROL BMPS INCLUDE INLET STENCIUNG AND SIGNAGE, EFFICIENT IRRIGA RON, AND INTEGRA TED PEST MANAGEMENT PRINCIPLES. THE TREA TMENT BMP SELECTED FOR THIS PROJECT IS ONE PROPOSED FlL TERRA ROOF DRAIN BIOFIL TRA RON VAULT (FTRD 8X3). ALL RUNOFF WILL BE TREATED VIA THE EXISRNG JENSEN PRECAST STORMWA TER INTERCEPTOR PER THE PREVIOUS BRESs/ COMMERCIAL PROJECT. N o 10 m ~ w 1M ~I-"I GRAPHICAL SCALE SCALE: I" = 20' LEGEND DRAINAGE SUBAREA now DIRECTION AIIEA FROM UPSTREAM TO DOw/>/STREAM NODE P,~OPOSED PA'ICMENT AREA CITY OF CARLSBAD BRESSI COMMERCIAL MAdOR BLDG 'B' POST-CONSTRUCTION BMP SITE PLAN PROPOSED CONDmONS