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Home My WebLink About6043; PALOMAR AIRPORT ROAD WIDENING AT PASEO DEL NORTE; SWQMP GREEN STREET EXEMPTION; 2019-04-04County of San Diego GREEN STREETS PDP EXEMPT SWQMP PALOMAR AIRPORT ROAD WIDENING AT PASEO DEL NORTE Project No. 6044 City Drawing No. 496-9 PALOMAR AIRPORT ROAD AT PASEO DEL NORTE CARLSBAD, CA 92011 ENGINEER OF WORK: DAVID A. WIENER RCE 77285 EXP 6/30/2019 PREPARED FOR: CITY OF CARLSBAD 1635 Faraday Avenue Carlsbad, CA 92008 SWQMP PREPARED BY: Michael Baker International 5050 Avenida Encinas, Suite 260 Carlsbad, CA 92008 (760)476-9193 DATE OF SWQMP: February 5, 2018 Revised April 4, 2019 PLANS PREPARED BY: SWQMP APPROVED BY: Michael Baker International 5050 Avenida Encinas, Suite 260 Carlsbad, CA 92008 (760)476-9193 APPROVAL DATE: GREEN STREETS (GS) SWQMP ii Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Page intentionally blank GREEN STREETS (GS) SWQMP iii Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Table of Contents Table of Contents ...................................................................................................................................... iii Attachments ............................................................................................................................................... iv Acronyms .................................................................................................................................................... iv Green Streets PDP Exempt SWQMP Preparer's Certification Page ................................................. v Submittal Record ...................................................................................................................................... vii Project Vicinity Map ................................................................................................................................ viii Step 1: Project type determination .................................................................................................... 1 Step 1.1: Storm Water Quality Management Plan requirements ................................................. 3 Step 1.2: Exemption to PDP definitions ........................................................................................... 3 Step 2: Construction Storm Water BMP Checklist .......................................................................... 4 Step 3: County of San Diego Green Streets PDP Exempt SWQMP Site Information Checklist .................................................................................................................................. 7 Step 3.1: Description of Existing Site Condition ............................................................................. 7 Step 3.2: Description of Existing Site Drainage Patterns .............................................................. 8 Step 3.3: Description of Proposed Site Development ................................................................... 9 Step 3.4: Description of Proposed Site Drainage Patterns ......................................................... 10 Step 3.5: Potential Pollutant Source Areas ................................................................................... 11 Step 3.6: Identification and Narrative of Receiving Water and Pollutants of Concern ........... 12 Step 3.7: Other Site Requirements and Constraints .................................................................... 13 Step 4: Source Control BMP Checklist ........................................................................................... 14 Step 5: Site Design BMP Checklist ................................................................................................. 16 Step 6: Summary of Green Infrastructure Strategies ................................................................... 18 Step 6.1: Description of Green Infrastructure strategy ................................................................ 18 Step 6.2: Green Infrastructure Strategies Summary Information ............................................... 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP iv Attachments Attachment 1: Backup for Green Streets Strategies Attachment 1a: Storm Water Pollutant Control Worksheet Calculations Attachment 1b: Form I-8: Categorization of Infiltration Feasibility Condition Attachment 1c: DMA Exhibit Attachment 2: Green Streets Strategies Maintenance Plan Attachment 2a: Green Streets Strategies Maintenance Thresholds and Actions Attachment 3: Copy of Project's Geotechnical and Groundwater Investigation Report Acronyms ACP Alternative Compliance Project APN Assessor's Parcel Number BMP Best Management Practice BMP DM Best Management Practice Design Manual GS Green Streets HSG Hydrologic Soil Group MS4 Municipal Separate Storm Sewer System N/A Not Applicable NRCS Natural Resources Conservation Service PDP Priority Development Project PDS Planning and Development Services PE Professional Engineer RPO Resource Protection Ordinance SC Source Control SD Site Design SDRWQCB San Diego Regional Water Quality Control Board SIC Standard Industrial Classification SWQMP Storm Water Quality Management Plan WPO Watershed Protection Ordinance Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP v Green Streets PDP Exempt SWQMP Preparer's Certification Page Project Name: Palomar Airport Road at Paseo Del Norte Permit Application Number: Project No. 6044 PREPARER'S CERTIFICATION I hereby declare that I am the Engineer in Responsible Charge of design of storm water best management practices (BMPs) for this project, and that I have exercised responsible charge over the design of the BMPs as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the PDP requirements of the County of San Diego BMP Design Manual, which is a design manual for compliance with local County of San Diego Watershed Protection Ordinance (Sections 67.801 et seq.) and regional MS4 Permit (California Regional Water Quality Control Board San Diego Region Order No. R9-2013-0001 as amended by R9- 2015-0001 and R9-2015-0100) requirements for storm water management. I have read and understand that the County of San Diego has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this PDP SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the plan check review of this PDP SWQMP by City staff is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design. RCE 77285 Exp: 6/30/2019 Engineer of Work's Signature, PE Number & Expiration Date David A. Wiener Print Name Michael Baker International Company February 5, 2018 Date Engineer's Seal: Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP vi This page was left intentionally blank. Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP vii Submittal Record Use this Table to keep a record of submittals of this PDP SWQMP. Each time the PDP SWQMP is re-submitted, provide the date and status of the project. In column 4 summarize the changes that have been made or indicate if response to plancheck comments is included. When applicable, insert response to plancheck comments behind this page. Preliminary Design / Planning / CEQA Submittal Number Date Summary of Changes 1 Initial Submittal 2 3 4 Final Design Submittal Number Date Summary of Changes 1 February 2018 Initial Submittal 2 3 4 Plan Changes Submittal Number Date Summary of Changes 1 Initial Submittal 2 3 4 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP viii Project Vicinity Map Project Name: Palomar Airport Road at Paseo Del Norte Record ID: GREEN STREETS (GS) SWQMP 1 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 1: Project type determination Is the project part of another Priority Development Project (PDP)? If so, a PDP SQWMP is required. Go to Step 2. ☐Yes ☒ No The project is (select one): ☐ New Development ☒ Redevelopment1 The total proposed newly created or replaced impervious area is: 11,385 ft2 The total existing (pre-project) impervious area is: 37,384 ft2 The total area disturbed by the project is: 40,111 ft2 If the total area disturbed by the project is 1 acre (43,560 sq. ft.) or more OR the project is part of a larger common plan of development disturbing 1 acre or more, a Waste Discharger Identification (WDID) number must be obtained from the State Water Resources Control Board. WDID: Is the project in any of the following categories, (a) through (f)? Yes ☐ No ☒ (a) New development projects that create 10,000 square feet or more of impervious surfaces (collectively over the entire project site). This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. Yes ☒ No ☐ (b) Redevelopment projects that create and/or replace 5,000 square feet or more of impervious surface (collectively over the entire project site on an existing site of 10,000 square feet or more of impervious surfaces). This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. Yes ☒ No ☐ (c) New and redevelopment projects that create and/or replace 5,000 square feet or more of impervious surface (collectively over the entire project site), and support one or more of the following uses: (i) Restaurants. This category is defined as a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). (ii) Hillside development projects. This category includes development on any natural slope that is twenty-five percent or greater. (iii) Parking lots. This category is defined as a land area or facility for the temporary parking or storage of motor vehicles used personally, for business, or for commerce. (iv) Streets, roads, highways, freeways, and driveways. This category is defined as any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles. 1 Redevelopment is defined as: The creation, addition, and or replacement of impervious surface on an already developed site. Examples include the expansion of a building footprint, road widening, the addition to or replacement of a structure. Replacement of impervious surfaces includes any activity where impervious material(s) are removed, exposing underlying soil during construction. Redevelopment does not include routine maintenance activities, such as trenching and resurfacing associated with utility work; pavement grinding; resurfacing existing roadways, sidewalks, pedestrian ramps, or bike lanes on existing roads; and routine replacement of damaged pavement, such as pothole repair. Applicants should note that any development project that will create and/or replace 10,000 square feet or more of impervious surface (collectively over the entire project site) is considered a new development. For solar energy farm projects, the area of the solar panels does not count toward the total impervious area of the site. GREEN STREETS (GS) SWQMP 2 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Project type determination (continued) Yes ☐ No ☒ (d) New or redevelopment projects that create and/or replace 2,500 square feet or more of impervious surface (collectively over the entire project site), and discharging directly to an Environmentally Sensitive Area (ESA). “Discharging directly to” includes flow that is conveyed overland a distance of 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from the project to the ESA (i.e. not commingled with flows from adjacent lands). Note: ESAs are areas that include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Board and San Diego Water Board; State Water Quality Protected Areas; water bodies designated with the RARE beneficial use by the State Water Board and San Diego Water Board; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees. See BMP Design Manual Section 1.4.2 for additional guidance. Yes ☒ No ☐ (e) New development projects, or redevelopment projects that create and/or replace 5,000 square feet or more of impervious surface, that support one or more of the following uses: (i) Automotive repair shops. This category is defined as a facility that is categorized in any one of the following SIC codes: 5013, 5014, 5541, 7532- 7534, or 7536-7539. (ii) Retail gasoline outlets (RGOs). This category includes RGOs that meet the following criteria: (a) 5,000 square feet or more or (b) a projected Average Daily Traffic (ADT) of 100 or more vehicles per day. Yes ☐ No ☒ (f) New or redevelopment projects that result in the disturbance of one or more acres of land and are expected to generate pollutants post construction. Note: See BMP Design Manual Section 1.4.2 for additional guidance. Does the project meet the definition of one or more of the Priority Development Project categories (a) through (f) listed above? □ No – the project is not a Priority Development Project (Standard Project). ☒ Yes – the project is a Priority Development Project (PDP). Further guidance may be found in Chapter 1 and Table 1-2 of the BMP Design Manual. The following is for redevelopment PDPs only: The area of existing (pre-project) impervious area at the project site (limit of work) is: 11,385 ft2 (A) The total proposed newly created or replaced impervious area is: 38,782 ft2 (B) Percent impervious surface created or replaced (B/A)*100: 104% The percent impervious surface created or replaced is (select one based on the above calculation): □ less than or equal to fifty percent (50%) – only new impervious areas are considered a PDP and subject to stormwater requirements OR ☒ greater than fifty percent (50%) – the entire project site is considered a PDP and subject to stormwater requirements GREEN STREETS (GS) SWQMP 3 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 1.1: Storm Water Quality Management Plan requirements Step Answer Progression Is the project a Standard Project, Priority Development Project (PDP), or exception to PDP definitions? To answer this item, complete Step 1 Project Type Determination Checklist on Pages 1 and 2, and see PDP exemption information below. For further guidance, see Section 1.4 of the BMP Design Manual in its entirety. □ Standard Project Standard Project requirements apply, including Standard Project SWQMP. Complete Standard Project SWQMP. □ PDP Standard and PDP requirements apply, including PDP SWQMP. Complete PDP SWQMP. ☒ PDP Exemption Go to Step 1.2 below. Step 1.2: Exemption to PDP definitions Is the project exempt from PDP definitions based on either of the following: □ Projects that are only new or retrofit paved sidewalks, bicycle lanes, or trails that meet the following criteria: (i) Designed and constructed to direct storm water runoff to Adjacent vegetated areas, or other non-erodible permeable areas; OR (ii) Designed and constructed to be hydraulically disconnected from paved streets or roads [i.e., runoff from the new improvement does not drain directly onto paved streets or roads]; OR (iii) Designed and constructed with permeable pavements or surfaces in accordance with County of San Diego Guidance on Green Infrastructure; If so: Standard Project requirements apply, AND any additional requirements specific to the type of project. County concurrence with the exemption is required. Provide discussion and list any additional requirements below in this form. Complete Standard Project SWQMP ☒ Projects that are only retrofitting or redeveloping existing paved Complete Green Streets alleys, streets or roads that are designed and constructed in PDP Exempt SWQMP. accordance with the County of San Diego Guidance on Green Infrastructure. Discussion / justification, and additional requirements for exceptions to PDP definitions, if applicable: Project is redeveloping existing paved road that is designed and constructed in accordance with the County of San Diego Guidance on Green Infrastructure. GREEN STREETS (GS) SWQMP 4 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 2: Construction Storm Water BMP Checklist Minimum Required Standard Construction Storm Water BMPs If you answer “Yes” to any of the questions below, your project is subject to Table 1 on the following page (Minimum Required Standard Construction Stormwater BMPs). As noted in Table 1, please select at least the minimum number of required BMPs, or as many as are feasible for your project. If no BMP is selected, an explanation must be given in the box provided. The following questions are intended to aid in determining construction BMP requirements for your project. Note: All selected BMPs below must be included on the BMP plan incorporated into the building sets. 1. Will there be soil disturbing activities that will result in exposed soil areas? (This includes minor grading and trenching.) Reference Table 1 Items A, B, D, and E Note: Soil disturbances NOT considered significant include, but are not limited to, change in use, mechanical/electrical/plumbing activities, signs, temporary trailers, interior remodeling, and minor tenant improvement. ☒ Yes ☐No 2. Will there be asphalt paving, including patching? Reference Table 1 Items D and F ☒ Yes ☐No 3. Will there be slurries from mortar mixing, coring, or concrete saw cutting? Reference Table 1 Items D and F ☒ Yes ☐No 4. Will there be solid wastes from concrete demolition and removal, wall construction, or form work? Reference Table 1 Items D and F ☒ Yes ☐No 5. Will there be stockpiling (soil, compost, asphalt, concrete, solid waste) for over 24 hours? Reference Table 1 Items D and F ☒ Yes ☐ No 6. Will there be dewatering operations? Reference Table 1 Items C and D ☐Yes ☒ No 7. Will there be temporary on-site storage of construction materials, including mortar mix, raw landscaping and soil stabilization materials, treated lumber, rebar, and plated metal fencing materials? Reference Table 1 Items E and F ☒ Yes ☐No 8. Will trash or solid waste product be generated from this project? Reference Table 1 Item F ☒ Yes ☐No 9. Will construction equipment be stored on site (e.g.: fuels, oils, trucks, etc.?) Reference Table 1 Item F ☒ Yes ☐No 10. Will Portable Sanitary Services (“Porta-potty”) be used on the site? Reference Table 1 Item F ☒ Yes ☐No GREEN STREETS (GS) SWQMP 5 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Table 1. Construction Storm Water BMP Checklist Minimum Required Best Management Practices (BMPs) CALTRANS SW Handbook2 Detail or County Std. Detail aBMP Selected Each selected BMP must be shown on the plan. If no BMP is selected, an explanation must be provided. A. Select Erosion Control Method for Disturbed Slopes (choose at least one for the appropriate season) Vegetation Stabilization Planting3 (Summer) SS-2, SS-4 ☐ There are no disturbed slopes to be protected in the project site. Hydraulic Stabilization Hydroseeding2 (Summer) SS-4 ☐ Bonded Fiber Matrix or Stabilized Fiber Matrix4 (Winter) SS-3 ☐ Physical Stabilization Erosion Control Blanket3 (Winter) SS-7 ☐ B. Select erosion control method for disturbed flat areas (slope < 5%) (choose at least one) County Standard Lot Perimeter Protection Detail PDS 6595, SC-2 ☐ Will use erosion control measures from Item A on flat areas also SS-3, 4, 7 ☐ County Standard Desilting Basin (must treat all site runoff) PDS 6606, SC-2 ☐ Mulch, straw, wood chips, soil application SS-6, SS-8 ☒ 2 State of California Department of Transportation (Caltrans). 2003. Storm Water Quality Handbooks, Construction Site Best Management Practices (BMPs) Manual. March. Available online at: http://www.dot.ca.gov/hq/construc/stormwater/manuals.htm. 3 If Vegetation Stabilization (Planting or Hydroseeding) is proposed for erosion control it may be installed between May 1st and August 15th. Slope irrigation is in place and needs to be operable for slopes >3 feet. Vegetation must be watered and established prior to October 1st. The owner must implement a contingency physical BMP by August 15th if vegetation establishment does not occur by that date. If landscaping is proposed, erosion control measures must also be used while landscaping is being established. Established vegetation must have a subsurface mat of intertwined mature roots with a uniform vegetative coverage of 70 percent of the natural vegetative coverage or more on all disturbed areas. 4 All slopes over three feet must have established vegetative cover prior to final permit approval. 5 County of San Diego, Planning & Development Services. 2012. Standard Lot Perimeter Protection Design System. Building Division. PDS 659. Available online at http://www.sandiegocounty.gov/pds/docs/pds659.pdf. 6 County of San Diego, Planning & Development Services. 2012. County Standard Desilting Basin for Disturbed Areas of 1 Acre or Less Building Division. PDS 659. Available online at http://www.sandiegocounty.gov/pds/docs/pds660.pdf. GREEN STREETS (GS) SWQMP 6 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Table 1. Construction Storm Water BMP Checklist (continued) Minimum Required Best Management Practices (BMPs) CALTRANS SW Handbook Detail or County Std. Detail aBMP Selected Each selected BMP must be shown on the plan. If no BMP is selected, an explanation must be provided. C. If runoff or dewatering operation is concentrated, velocity must be controlled using an energy dissipater Energy Dissipater Outlet Protection7 SS-10 ☐ N/A – No outlets exist in the pre- or post-condition. D. Select sediment control method for all disturbed areas (choose at least one) Silt Fence SC-1 ☒ Fiber Rolls (Straw Wattles) SC-5 ☒ Gravel & Sand Bags SC-6 & 8 ☒ Dewatering Filtration NS-2 ☐ Storm Drain Inlet Protection SC-10 ☐ Engineered Desilting Basin (sized for 10-year flow) SC-2 ☐ E. Select method for preventing offsite tracking of sediment (choose at least one) Stabilized Construction Entrance TC-1 ☐ Construction Road Stabilization TC-2 ☐ Entrance/Exit Tire Wash TC-3 ☐ Entrance/Exit Inspection & Cleaning Facility TC-1 ☐ Street Sweeping and Vacuuming SC-7 ☒ F. Select the general site management BMPs F.1 Materials Management Material Delivery & Storage WM-1 ☒ Spill Prevention and Control WM-4 ☒ F.2 Waste Management8 Waste Management Concrete Waste Management WM-8 ☒ Solid Waste Management WM-5 ☒ Sanitary Waste Management WM-9 ☒ Hazardous Waste Management WM-6 ☒ Note: The Construction General Permit (Order No. 2009-0009-DWQ) also requires all projects not subject to the BMP Design Manual to comply with runoff reduction requirements through the implementation of post-construction BMPs as described in Section XIII of the order. 7 Regional Standard Drawing D-40 – Rip Rap Energy Dissipater is also acceptable for velocity reduction. 8 Not all projects will have every waste identified. The applicant is responsible for identifying wastes that will be onsite and applying the appropriate BMP. For example, if concrete will be used, BMP WM-8 must be selected. GREEN STREETS (GS) SWQMP 7 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 3: County of San Diego Green Streets PDP Exempt SWQMP Site Information Checklist Step 3.1: Description of Existing Site Condition Project Watershed (Complete Hydrologic Unit, Area, and Subarea Name with Numeric Identifier) 904.40 – Carlsbad Hydrologic Unit, Encinas HA Current Status of the Site (select all that apply): ☒ Existing development ☐ Previously graded but not built out ☐ Demolition completed without new construction ☐ Agricultural or other non-impervious use ☐ Vacant, undeveloped/natural Description / Additional Information: Existing Land Cover Includes (select all that apply and provide each area on site): ☒ Vegetative Cover 0.05 Acres (2,231 Square Feet) ☐ Non-Vegetated Pervious Areas 0 Acres ( 0 Square Feet) ☒ Impervious Areas 0.86 Acres (37,384 Square Feet) Description / Additional Information: Land cover includes existing asphalt roadway, concrete sidewalk, and landscaping Underlying Soil belongs to Hydrologic Soil Group (select all that apply): □ NRCS Type A □ NRCS Type B □ NRCS Type C ☒ NRCS Type D Approximate Depth to Groundwater (GW) (or N/A if not using infiltration): □ GW Depth < 5 feet □ 5 feet < GW Depth < 10 feet ☒ 10 feet < GW Depth < 20 feet ☐ GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): □ Watercourses □ Seeps □ Springs □ Wetlands ☒ None □ Other Description / Additional Information: GREEN STREETS (GS) SWQMP 8 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 3.2: Description of Existing Site Drainage Patterns How is storm water runoff conveyed from the site? At a minimum, this description should answer: (1) Whether existing drainage conveyance is natural or urban; (2) Is runoff from offsite conveyed through the site? if yes, quantify all offsite drainage areas, design flows, and locations where offsite flows enter the project site, and summarize how such flows are conveyed through the site; (3) Provide details regarding existing project site drainage conveyance network, including any existing storm drains, concrete channels, swales, detention facilities, storm water treatment facilities, natural or constructed channels; and (4) Identify all discharge locations from the existing project site along with a summary of conveyance system size and capacity for each of the discharge locations. Provide summary of the pre-project drainage areas and design flows to each of the existing runoff discharge locations. Describe existing site drainage patterns: 1) Existing drainage conveyance within the site is urban, consisting of curb and gutter. 2) Offsite flows entering the roadway drainage area come from portions of business frontages along Palomar Airport Road. The Mobil Gas Station also has a curb outlet that discharge to Palomar Airport Road. 3) The drainage conveyance for the site is curb & gutter along Palomar Airport Road flowing west. 4) There is an existing curb inlet directly west of the improvements that connects to a drainage ditch flowing south along Interstate-5 within Caltrans right-of-way. GREEN STREETS (GS) SWQMP 9 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 3.3: Description of Proposed Site Development Project Description / Proposed Land Use and/or Activities: The project proposes widening eastbound Palomar Airport Road to accommodate an additional right-turn lane onto Paseo Del Norte and include a new bike lane. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): Proposed impervious features include the roadway, concrete sidewalk, stamped median, and two driveways. List/describe proposed pervious features of the project (e.g., landscape areas): Proposed pervious features include landscape areas and proposed pervious gutter along Palomar Airport Road. Does the project include grading and changes to site topography? ☐ Yes ☒ No Description / Additional Information: The project does not propose any major grading. The runoff will continue to flow west along Palomar Airport Road. Insert acreage or square feet for the different land cover types in the table below: Change in Land Cover Type Summary Land Cover Type Existing (acres or ft2) Proposed (acres or ft2) Percent Change Vegetation 0.05 ac 0.01 ac -80% Pervious (non-vegetated) 0.00 ac 0.02 ac - Impervious 0.86 ac 0.89 ac +3.5% GREEN STREETS (GS) SWQMP 10 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 3.4: Description of Proposed Site Drainage Patterns Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? ☒ Yes ☐ No If yes, provide details regarding the proposed project site drainage conveyance network, including storm drains, concrete channels, swales, detention facilities, storm water treatment facilities, natural or constructed channels, and the method for conveying offsite flows through or around the proposed project site. Identify all discharge locations from the proposed project site along with a summary of the conveyance system size and capacity for each of the discharge locations. Provide a summary of pre- and post-project drainage areas and design flows to each of the runoff discharge locations. Reference the drainage study for detailed calculations. Describe proposed site drainage patterns: The proposed site drainage patterns consist of conveying flows via curb & gutter. A portion of runoff will enter the pervious gutter. The DCV will infiltrate into underlying soil. Larger flows will travel through the proposed 4” perforated pvc underdrain. The proposed storm drain piping will discharge to the existing drainage ditch west of the project site. Any runoff that bypasses the proposed pervious gutter will be conveyed as it does in the existing condition. GREEN STREETS (GS) SWQMP 11 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 3.5: Potential Pollutant Source Areas Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply). Select “Other” if the project is a phased development and provide a description: □ On-site storm drain inlets □ Interior floor drains and elevator shaft sump pumps □ Interior parking garages □ Need for future indoor & structural pest control □ Landscape/Outdoor Pesticide Use □ Pools, spas, ponds, decorative fountains, and other water features □ Food service □ Refuse areas □ Industrial processes □ Outdoor storage of equipment or materials □ Vehicle and Equipment Cleaning □ Vehicle/Equipment Repair and Maintenance □ Fuel Dispensing Areas □ Loading Docks □ Fire Sprinkler Test Water □ Miscellaneous Drain or Wash Water ☒ Plazas, sidewalks, and parking lots □ Other (provide description) Description / Additional Information: GREEN STREETS (GS) SWQMP 12 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 3.6: Identification and Narrative of Receiving Water and Pollutants of Concern Describe flow path of storm water from the project site discharge location(s), through urban storm conveyance systems as applicable, to receiving creeks, rivers, and lagoons as applicable, and ultimate discharge to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): The runoff is conveyed via the gutter on the south side of Palomar Airport Road. It then travels either through an existing curb inlet or the proposed storm drain pipe, to an existing concrete brow ditch that outfalls into a vegetated area south of the project. From there, the runoff travels west to the Pacific Ocean. List any 303(d) impaired water bodies within the path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs and/or Highest Priority Pollutants from the WQIP for the impaired water bodies: 303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs / WQIP Highest Priority Pollutant GREEN STREETS (GS) SWQMP 13 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 3.7: Other Site Requirements and Constraints When applicable, list other site requirements or constraints that will influence storm water management design, such as zoning requirements including setbacks and open space, or local codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. As is typical with roadway projects, the constraint is available area within the right-of-way for proposed BMPs. Refer to the DMA Maps. In addition, infiltration rates are below 0.5 in/hr. Downstream drainage outfalls to Caltrans right-of-way. An encroachment permit is in process for improvements in Caltrans ROW. Optional Additional Information or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. GREEN STREETS (GS) SWQMP 14 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 4: Source Control BMP Checklist Source Control BMPs All development projects must implement source control BMPs 4.2.1 through 4.2.6 where applicable and feasible. See Chapter 4.2 and Appendix E of the County BMP Design Manual for information to implement source control BMPs shown in this checklist. Answer each category below pursuant to the following: • "Yes" means the project will implement the source control BMP as described in Chapter 4.2 and/or Appendix E of the County BMP Design Manual. Discussion / justification is not required. • "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion / justification must be provided. • "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion / justification must be provided. Source Control Requirement Applied? 4.2.1 Prevention of Illicit Discharges into the MS4 ☒ Yes ☐No ☐ N/A Discussion / justification if 4.2.1 not implemented: 4.2.2 Storm Drain Stenciling or Signage ☐Yes ☐No ☒ N/A Discussion / justification if 4.2.2 not implemented: 4.2.3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal ☐Yes ☐No ☒ N/A Discussion / justification if 4.2.3 not implemented: 4.2.4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and Wind Dispersal ☐Yes ☐No ☒ N/A Discussion / justification if 4.2.4 not implemented: GREEN STREETS (GS) SWQMP 15 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Source Control Requirement Applied? 4.2.5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal ☐Yes ☐No ☒ N/A Discussion / justification if 4.2.5 not implemented: 4.2.6 Additional BMPs Based on Potential Sources of Runoff Pollutants (must answer for each source listed below): □ A. On-site storm drain inlets ☐Yes ☐No ☒ N/A □ B. Interior floor drains and elevator shaft sump pumps ☐Yes ☐No ☒ N/A □ C. Interior parking garages ☐Yes ☐No ☒ N/A □ D. Need for future indoor & structural pest control ☐Yes ☐No ☒ N/A □ E. Landscape/outdoor pesticide use ☐Yes ☐No ☒ N/A □ F. Pools, spas, ponds, fountains, and other water features ☐Yes ☐No ☒ N/A □ G. Food service ☐Yes ☐No ☒ N/A □ H. Refuse areas ☐Yes ☐No ☒ N/A □ I. Industrial processes ☐Yes ☐No ☒ N/A □ J. Outdoor storage of equipment or materials ☐Yes ☐No ☒ N/A □ K. Vehicle and equipment cleaning ☐Yes ☐No ☒ N/A □ L. Vehicle/equipment repair and maintenance ☐Yes ☐No ☒ N/A □ M. Fuel dispensing areas ☐Yes ☐No ☒ N/A □ N. Loading docks ☐Yes ☐No ☒ N/A □ O. Fire sprinkler test water ☐Yes ☐No ☒ N/A □ P. Miscellaneous drain or wash water ☐Yes ☐No ☒ N/A □ Q. Plazas, sidewalks, and parking lots ☒ Yes ☐No ☐N/A Discussion / justification if 4.2.6 not implemented. Clearly identify which sources of runoff pollutants are discussed. Justification must be provided for all "No" answers shown above. Note: Show all source control measures described above that are included in design capture volume calculations in the plan sheets of Attachment 1. GREEN STREETS (GS) SWQMP 16 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 5: Site Design BMP Checklist Site Design Requirement Applied? 4.3.1 Maintain Natural Drainage Pathways and Hydrologic Features ☐Yes ☐No ☒ N/A Discussion / justification if 4.3.1 not implemented: No natural drainage pathways or hydrologic features exist at the project site. 4.3.2 Conserve Natural Areas, Soils, and Vegetation ☐Yes ☒ No ☐ N/A Discussion / justification if 4.3.2 not implemented: The constrained space with the right-of-way does not allow for the small landscape areas to remain. 4.3.3 Minimize Impervious Area ☐Yes ☒ No ☐N/A Discussion / justification if 4.3.3 not implemented: The constrained space with the right-of-way does not allow for landscape areas to be proposed behind the sidewalk. 4.3.4 Minimize Soil Compaction ☒ Yes ☐ No ☐N/A Discussion / justification if 4.3.4 not implemented: 4.3.5 Impervious Area Dispersion ☐ Yes ☒ No ☐N/A Discussion / justification if 4.3.5 not implemented: A pervious gutter system will be used to allow stormwater from the street an opportunity to infiltrate. Site Design BMPs All development projects must implement site design BMPs SD-A through SD-H where applicable and feasible. See Chapter 4.3 and Appendix E of the County BMP Design Manual for information to implement site design BMPs shown in this checklist. Answer each category below pursuant to the following: •"Yes" means the project will implement the site design BMP as described in Chapter 4.3 and/or Appendix E of the County BMP Design Manual. Discussion / justification is not required. •"No" means the BMP is applicable to the project but it is not feasible to implement. Discussion / justification must be provided. •"N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project site has no existing natural areas to conserve). Discussion / justification must be provided. GREEN STREETS (GS) SWQMP 17 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Site Design Requirement Applied? 4.3.6 Runoff Collection ☐Yes ☒ No ☐N/A Discussion / justification if 4.3.6 not implemented: The existing and proposed land use is a street and sidewalk. There are no buildings associated with this site. As such, there are no means of collecting roof runoff and rain water via rain barrels. 4.3.7 Landscaping with Native or Drought Tolerant Species ☒ Yes ☐No ☐N/A Discussion / justification if 4.3.7 not implemented: 4.3.8 Harvesting and Using Precipitation ☐Yes ☐No ☒ N/A Discussion / justification if 4.3.8 not implemented: Rain barrels and cisterns are not implemented since it is not practical. Note: Show all site design measures described above that are included in design capture volume calculations in the plan sheets of Attachment 1. GREEN STREETS (GS) SWQMP 18 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Step 6: Summary of Green Infrastructure Strategies Green Streets PDP exempt projects must implement Green Infrastructure strategies for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of Green Infrastructure strategies for storm water pollutant control must be based on the selection process described in Chapter 5. Use this section to provide narrative description of the plan of action for Green Infrastructure strategies implementation at the project site in the box below. Step 6.1: Description of Green Infrastructure strategy Describe the plan of action for Green Infrastructure strategies implementation at the site. This information must describe how the steps for selecting and designing storm water pollutant control BMPs presented in Section 5.1 of the BMP Design Manual were followed, and the results (type of Green Infrastructure strategies selected). At the end of this discussion provide a summary of all the Green Infrastructure strategies within the project including the type and number. The project will direct runoff from the proposed hardscape and roadway surface to the pervious gutter via surface sheet flow. The runoff will slowly infiltrate the soil until the overflow reaches the 4” perforated PVC underdrain flowing west along Palomar Airport Road. Permeable gravel beneath the underdrain will capture and infiltrate the DCV. Larger flows will enter the underdrain. Other BMPs that were considered include bioretention area and dry well. Bioretention area is not feasible because of minimal surface area available and lack of storm drain infrastructure to tie into for overflow. Dry well is not feasible because of insufficient soils at the required depths. (Continue on following page as necessary.) GREEN STREETS (GS) SWQMP 19 of 20 Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 Plan of action for Green Infrastructure Strategies Continued (Page reserved for continuation of description of plan of action for Green Infrastructure strategies implementation at the site) (Continued from previous page) Template Date: March 16, 2016 LUEG:SW GS SWQMP Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP 20 of 20 Step 6.2: Green Infrastructure Strategies Summary Information (Copy this page as needed to provide information for each individual proposed Green Infrastructure strategy) Green Infrastructure Strategies ID No. Construction Plan Sheet No. Type of Green Infrastructure strategy: □ Retention by harvest and use (HU-1) □ Retention by infiltration basin (INF-1) ☐ Retention by bioretention (INF-2) ☒ Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) □ Biofiltration (BF-1) □ Biofiltration with Nutrient Sensitive Media Design (BF-2) □ Proprietary Biofiltration (BF-3) meeting all requirements of Appendix F □ Flow -thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) □ Flow -thru treatment control with alternative compliance (provide BMP type/description in discussion section below) □ Other (describe in discussion section below) Purpose: ☒ Pollutant control only □ Pre -treatment/forebay for another Green Infrastructure strategy ☐Other (describe in discussion section below) Who will be the final owner of this Green Infrastructure strategy? □ HOA ☐ Property Owner ☐ County ☒ Other (City of Carlsbad) Who will maintain this Green Infrastructure strategy into perpetuity? □ HOA ☐ Property Owner ☐ County ☒ Other (City of Carlsbad) What Category (1-4) is the Green Infrastructure strategy? Refer to the Category definitions in Section 7.3 of the BMP DM. Category 2 Discussion (as needed): The proposed BMP encroaches into Caltrans’ Right-of-Way, however it will be maintained by the City per Operations and Maintenance Agreement. (Continue on subsequent pages as necessary) Template Date: March 16, 2016 LUEG:SW GS SWQMP Attachments Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP ATTACHMENT 1 BACKUP FOR PDP POLLUTANT CONTROL BMPS This is the cover sheet for Attachment 1. Indicate which Items are Included behind this cover sheet: Attachment Sequence Contents Checklist Attachment 1a Storm Water Pollutant Control Worksheet Calculations -Worksheet B.1-1 (Required) -Worksheet B.3-1 (if applicable) -Worksheet B.4-1 (if applicable) -Worksheet B.4-2 (if applicable) -Worksheet B.5-1 (if applicable) -Worksheet B.5-2 (if applicable) -Worksheet B.5-3 (if applicable) -Worksheet B.6-1 (if applicable) -Summary Worksheet (optional) ☒ Included Attachment 1b Form I-8, Categorization of Infiltration Feasibility Condition (Required unless the project will use harvest and use BMPs) Refer to Appendices C and D of the BMP Design Manual to complete Form I-8. ☒ Included □ Not included because the entire project will use harvest and use BMPs Attachment 1c DMA Exhibit (Required) See DMA Exhibit Checklist on the back of this Attachment cover sheet. ☒ Included Palomar Airport Road Widening at Paseo Del Norte DMA SUMMARY DMA Proposed Impervious (sf)Total Area (sf) Percent Impervious BMP Type 100 11,310 12,140 93%Pervious Gutter Total (sf)11,310 12,140 93% (ac)0.26 0.28 DMA SUMMARY Palomar Airport Road Widening at Paseo Del Norte BMP 100 - Pervious Gutter 1 DCV (Worksheet B.2-1)DCV=499 cubic-feet 2 Estimated design infiltration rate (Form I-9 in Appendix I)Kdesign=0.058 in/hr 3 Available BMP Infiltration surface area ABMP=1160 sq-ft 4 Average depth in the BMP footprint (DCV/ABMP) Davg=0.43 feet 5 Drawdown time, T (Davg *12/Kdesign)T=90 hours 8 Depth of Gravel Below Underdrain (Davg x12/ 0.4) (0.4=void space) Dgravel=13 inches 6 Simple Sizing Method for Infiltration BMP 100 Worksheet B.4-1 Discussion: DCV will be stored in 13" gravel section below underdrain and will infiltrate in 89 hours. Design Capture Volume DMA Area Surface Type Runoff Factor 100 Impervious 0.9 11,385 Pervious Gutter 0.1 755 85th % Storm (in)Tributary Area (sf)12,140 Adjusted Runoff Factor 0.85 DCV (cf)499 Palomar Airport Road Widening at Paseo Del Norte DCV Summary 0.58 Appendix I: Forms and Checklists I-3 February 2016 Categorization of Infiltration Feasibility Condition Form I-8 Part 1 - Full Infiltration Feasibility Screening Criteria Would infiltration of the full design volume be feasible from a physical perspective without any undesirable consequences that cannot be reasonably mitigated? Criteria Screening Question Yes No 1 Is the estimated reliable infiltration rate below proposed facility locations greater than 0.5 inches per hour? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and Appendix D. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 2 Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of geotechnical hazards (slope stability, groundwater mounding, utilities, or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Appendix I: Forms and Checklists I-4 February 2016 Form I-8 Page 2 of 4 Criteri a Screening Question Yes No 3 Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of groundwater contamination (shallow water table, storm water pollutants or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 4 Can infiltration greater than 0.5 inches per hour be allowed without causing potential water balance issues such as change of seasonality of ephemeral streams or increased discharge of contaminated groundwater to surface waters? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Part 1 Result * If all answers to rows 1 - 4 are “Yes” a full infiltration design is potentially feasible. The feasibility screening category is Full Infiltration If any answer from row 1-4 is “No”, infiltration may be possible to some extent but would not generally be feasible or desirable to achieve a “full infiltration” design. Proceed to Part 2 *To be completed using gathered site information and best professional judgment considering the definition of MEP in the MS4 Permit. Additional testing and/or studies may be required by the City to substantiate findings. Appendix I: Forms and Checklists I-5 February 2016 Form I-8 Page 3 of 4 Part 2 – Partial Infiltration vs. No Infiltration Feasibility Screening Criteria Would infiltration of water in any appreciable amount be physically feasible without any negative consequences that cannot be reasonably mitigated? Criteria Screening Question Yes No 5 Do soil and geologic conditions allow for infiltration in any appreciable rate or volume? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and Appendix D. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates. 6 Can Infiltration in any appreciable quantity be allowed without increasing risk of geotechnical hazards (slope stability, groundwater mounding, utilities, or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates. Appendix I: Forms and Checklists I-6 February 2016 Form I-8 Page 4 of 4 Criteria Screening Question Yes No 7 Can Infiltration in any appreciable quantity be allowed without posing significant risk for groundwater related concerns (shallow water table, storm water pollutants or other factors)? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates. 8 Can infiltration be allowed without violating downstream water rights? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates. Part 2 Result* If all answers from row 5-8 are yes then partial infiltration design is potentially feasible. The feasibility screening category is Partial Infiltration. If any answer from row 5-8 is no, then infiltration of any volume is considered to be infeasible within the drainage area. The feasibility screening category is No Infiltration. *To be completed using gathered site information and best professional judgment considering the definition of MEP in the MS4 Permit. Additional testing and/or studies may be required by the City to substantiate findings. Factor Description Assigned Weight (w) Product (p) p = w x v Soil assessment methods 0.25 0.25 Predominant soil texture 0.25 0.25 Site soil variability 0.25 0.25 Depth to groundwater / impervious layer 0.25 0.5 1.25 Level of pretreatment/ expected sediment loads 0.5 0.5 Redundancy/resiliency 0.25 0.5 Compaction during construction 0.25 0.25 1.25 Palomar Airport Road Widening at Paseo Del Norte Factor of Safety and Design Infiltration Rate Worksheet Form I-9 Factor Category Factor Value (v) A Suitability Assessment 1 1 1 2 Suitability Assessment Safety Factor, SA = Sp B Design 1 2 1 Design Safety Factor, SB = Sp Supporting Data Briefly describe infiltration test and provide reference to test forms: Ninyo & Moore (Project Number 108040005) performed the percolation test January 18, 2017. A total of two (2) exploratory borings to depths of 5 feet below ground surface were performed in order to establish general infiltration rates. In general, the site was found to be underlain by fill and old paralic deposits. Laboratory testing included an evaluation of in-situ moisture content and gradation (sieve) in accordance with ASTM D2216 and D422. No groundwater was encountered to the depth of the borings. Combined Safety Factor, Stotal= SA x SB 1.5625 Observed Infiltration Rate, inch/hr, Kobserved (corrected for test-specific bias)0.09 Design Infiltration Rate, in/hr, Kdesign = Kobserved / Stotal 0.058 Template Date: March 16, 2016 LUEG:SW GS SWQMP Attachments Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP Use this checklist to ensure the required information has been included on the DMA Exhibit: The DMA Exhibit must identify: □ Underlying hydrologic soil group □ Approximate depth to groundwater □ Existing natural hydrologic features (watercourses, seeps, springs, wetlands) □ Critical coarse sediment yield areas to be protected □ Existing topography and impervious areas □ Existing and proposed site drainage network and connections to drainage offsite □ Proposed demolition □ Proposed grading □ Proposed impervious features □ Proposed design features and surface treatments used to minimize imperviousness □ Drainage management area (DMA) boundaries, DMA ID numbers, and DMA areas (square footage or acreage), and DMA type (i.e., drains to BMP, self-retaining, or self-mitigating) □ Potential pollutant source areas and corresponding required source controls (see Chapter 4, Appendix E.1, and Step 3.5) □ Green Infrastructure Strategies (identify location, structural BMP ID #, type of BMP, and size/detail) RWRWRWRWRWRWRWRWRWTTTTTTTGGGGGRWRWRWRWRWRWRWRWRWTTTTTTTGGGGG14IMPROVEMENT PLAN FOR:5050 Avenida EncinasSuite 260Carlsbad, CA 92008Phone: (760) 476-9193MBAKERINTL.COMPALOMAR AIRPORT ROAD WIDENINGAT PASEO DEL NORTESECTIONS AND DETAILS®34" MAX.12" MIN.®® PBPBP B PBP BPBPB PBPBW W W W W WDMAPROPOSED NEWIMPERVIOUS (sf)PROPOSEDREPLACEDIMPERVIOUS (sf)PROPOSEDPERVIOUSGUTTER (sf)TOTAL AREA(sf)DESIGNCAPTUREVOLUME (CF)BMP TYPEDMA EXHIBIT14IMPROVEMENT PLAN FOR:5050 Avenida EncinasSuite 260Carlsbad, CA 92008Phone: (760) 476-9193MBAKERINTL.COMPALOMAR AIRPORT ROAD WIDENINGAT PASEO DEL NORTE Template Date: March 16, 2016 LUEG:SW GS SWQMP Attachments Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP ATTACHMENT 2 Green Infrastructure Strategies Maintenance Information This is the cover sheet for Attachment 2. Indicate which Items are Included behind this cover sheet: Attachment Sequence Contents Checklist Attachment 2a Green Infrastructure strategies Maintenance Plan (Required) ☐ Included See Green Infrastructure strategies Maintenance Information Checklist on the back of this Attachment cover sheet. Template Date: March 16, 2016 LUEG:SW GS SWQMP Attachments Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP Use this checklist to ensure the required information has been included in the Green Infrastructure Strategies Maintenance Information Attachment: Attachment 2a must identify: □ Specific maintenance indicators and actions for proposed Green Infrastructure strategy(ies). This must be based on Appendix K.4 of the BMP Design Manual and enhanced to reflect actual proposed components of the Green Infrastructure strategy. □ How to access the Green Infrastructure strategies to inspect and perform maintenance □ Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the Green Infrastructure strategies and compare to maintenance thresholds) □ Manufacturer and part number for proprietary parts of Green Infrastructure strategies when applicable □ Maintenance thresholds specific to the Green Infrastructure strategies, with a location- specific frame of reference (e.g., level of accumulated materials that triggers removal of the materials, to be identified based on viewing marks on silt posts or measured with a survey rod with respect to a fixed benchmark within the Green Infrastructure strategy) □ Recommended equipment to perform maintenance □ When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management TABLE 7-3. Maintenance Indicators and Actions for Non-Vegetated Infiltration BMPs Typical Maintenance Indicator(s) for Non-Vegetated Infiltration BMPs Maintenance Actions Accumulation of sediment, litter, or debris in infiltration basin, pre- treatment device, or on permeable pavement surface Remove and properly dispose accumulated materials. Standing water in infiltration basin without subsurface infiltration gallery for longer than 96 hours following a storm event Remove and replace clogged surface soils. Standing water in subsurface infiltration gallery for longer than 96 hours following a storm event This condition requires investigation of why infiltration is not occurring. If feasible, corrective action shall be taken to restore infiltration (e.g. flush fine sediment or remove and replace clogged soils). BMP may require retrofit if infiltration cannot be restored. If retrofit is necessary, the [City Engineer] shall be contacted prior to any repairs or reconstruction. Standing water in permeable paving area Flush fine sediment from paving and subsurface gravel. Provide routine vacuuming of permeable paving areas to prevent clogging. Damage to permeable paving surface Repair or replace damaged surface as appropriate. Note: When inspection or maintenance indicates sediment is accumulating in an infiltration BMP, the DMA draining to the infiltration BMP should be examined to determine the source of the sediment, and corrective measures should be made as applicable to minimize the sediment supply. Template Date: March 16, 2016 LUEG:SW GS SWQMP Attachments Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP ATTACHMENT 3 Copy of Project's Geotechnical and Groundwater Investigation Report This is the cover sheet for Attachment 3. If hardcopy or CD is not attached, the following information should be provided: Title: Infiltration Testing Results Prepared By: Ninyo & Moore Date: January 31, 2017 Template Date: March 16, 2016 LUEG:SW GS SWQMP Attachments Preparation Date: February 5, 2018 GREEN STREETS (GS) SWQMP This page was left intentionally blank.