Loading...
HomeMy WebLinkAboutRP 92-10A; BLUE WATER GRILL CARLSBAD; PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP); 2016-05-25CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR BWG CARLSBAD PROJECT ID: RP 92-10(A) I CDP 92-08(A) DRAWING No. DWG 492-4A SWQMP No. SWMPI6-08 ENGINEER OF WORK: JOHN CRUIKSHANK, C50792 Exp -30-17 50792 IVI OF c PREPARED FOR: BLUEWATER GRILL 630 LIDO PARK DRIVE NEWPORT BEACH, CA 92663 PREPARED BY: JMCA2 411 N. HARBOR BLVD., STE. 201 SAN PEDRO, CA 90731 310-241-6550 DATE: MAY 25, 2016 RECEIVED JUL 20 2016 LAND DEVELOPMENT ENGINEERING '12.-!O4 CERTIFICATION PAGE Project Name: BWG CARLSBAD Project ID: RP 92-10(A)1CDP 92-08(A) I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order. I have read and understand that the City Engineer 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 SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design 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 SWQMP by the City Engineer 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. Enger of Work's Signature, PE Number & Expiration JOHN CRUIKSHANK Print Name JMCA2 Company 05/25/16 Date ps*41 NOT TO SCALE SITE MAP Bluewater Grill RP 92-10(A) / CDP 92-08(A) TABLE OF CONTENTS Certification Page Project Vicinity Map FORM E-34 Storm Water Standard Questionnaire Site Information FORM E-36 Standard Project Requirement Checklist Summary of POP Structural BMPs Attachment 1: Backup for POP Pollutant Control BMPs Attachment Ia: DMA Exhibit Attachment I b: Tabular Summary of OMAs and Design Capture Volume Calculations Attachment 1c: Harvest and Use Feasibility Screening (when applicable) Attachment Id: Categorization of Infiltration Feasibility Condition (when applicable) Attachment le: Pollutant Control BMP Design Worksheets I Calculations Attachment 2: Backup for PDP Hydromodification Control Measures Attachment 2a: Hydromodification Management Exhibit Attachment 2b: Management of Critical Coarse Sediment Yield Areas Attachment 2c: Geomorphic Assessment of Receiving Channels Attachment 2d: Flow Control Facility Design Attachment 3: Structural BMP Maintenance Thresholds and Actions Attachment 4: Single Sheet BMP (SSBMP) Exhibit STORM WATER STANDARDS Development Services (City of Carlsbad QUESTIONNAIRE Land Development Engineering 1635 Faraday Avenue E-34 (760) 602-2750 www.carlsbadca.gov INSTRUCTIONS: To address post-development pollutants that may be generated from development projects, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to PRIORITY DEVELOPMENT PROJECT' (PDP) requirements. Your 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. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the city. If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. PROJECT INFORMATION PROJECT NAME: BWG CARLSBAD PROJECT ID: RP 92-10(A)ICDP 92-08(A) ADDRESS: 417 CARLSBAD VILLAGE DRIVE APN: 203-296-07-00 The project is (check one): 0 New Development J Redevelopment The total proposed disturbed area is: 8,885 2 (0.204__) acres The total proposed newly created and/or replaced impervious area is: 8,755 2 (0.201 ) acres If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the SWQMP # of the larger development project: Project ID SWQMP#: Then, go to Step I and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. E-34 Page 1 of 4 REV 02/16 STEP I TO BE COMPLETED FOR ALL PROJECTS To determine if your project is a "development project", please answer the following question: YES NO Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? If you answered "yes" to the above question, provide justification below then go to Step 5, mark the third box stating "my project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant information. Justification/discussion: (e.g. the project includes only interior remodels within an existing building): If you answered "no" to the above question, the project is a 'development project', go to Step 2. STEP 2 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer the following questions: Is your project LIMITED to one or more of the following: YES NO 1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; El 0 Designed and constructed to be hydraulically disconnected from paved streets or roads; Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in accordance with the USEPA Green Streets guidance? 3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark the second box stating "my project is EXEMPT from PDP . .." and complete applicant information. Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered "no" to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page 2of4 REV 02/16 STEP 3 TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS To determine if your project is a POP, please answer the following questions (MS4 Permit Provision E.3.b.(1)): YES NO Is your project a new development that creates 10,000 square feet or more of impervious surfaces collectively over the entire project site? This includes commercial, industrial, residential, mixed-use, U IJ and public development projects on public or private land. Is your project a redevelopment project creating and/or replacing .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 0 El more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a restaurant? A restaurant is a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and LZ 0 refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface collectively over the entire project site and supports a hillside development project? A hillside 0 ZI development project includes development on any natural slope that is twenty-five percent or greater. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is a land area or facility for the temporary parking or storage of motor vehicles used personally for business or for commerce. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a street, road, highway 0 El freeway or driveway? A street, mad, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more of impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of 0 II 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).* Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface that supports an automotive repair shop? An automotive repair shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC) codes: 5013, 5014, 5541, 7532-7534, or 7536-7539. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes El 0 RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily Traffic (ADT) of 100 or more vehicles per day. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land El 0 and are expected to generate pollutants post construction? Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC 0 I1 21.203.040) If you answered 'yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a PDP ..." and complete applicant information. If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the second box stating "My project is a 'STANDARD PROJECT'..." and complete applicant information. E-34 Page 3of4 REV 02/16 SITE INFORMATION CHECKLIST Project Summary Information Project Name BWG CARLSBAD Project ID RP 92-1O(A)ICDP 92-08(A) Project Address 417 CARLSBAD VILLAGE Assessors Parcel Number(s) (APN(s)) 20329607-00 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 0.298 _Acres (_ 12.994 Square Feet) Existing Impervious Area (subset of Parcel Area) Acres ( 0.285 12,407 -_- Square Feet) Area to be disturbed by the project (Project Area) 0.204 Acres L8885 - - _____ Square Feet) Project Proposed Impervious Area (subset of Project Area) _0.201_- Acres L8.755 Square Feet) Project Proposed Pervious Area (subset of Project Area) _0.003_- Acres C 13 Square Feet) Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This may be less than the Parcel Area. Description of Existing Site Condition and Drainage Patterns Current Status of the Site (select all that apply): X Existing development Previously graded but not built out Agricultural or other non-impervious use Vacant, undeveloped/natural Description / Additional Information: Existing Land Cover Includes (select all that apply): X Vegetative Cover X Non-Vegetated Pervious Areas X Impervious Areas Description / Additional Information: Underlying Soil belongs to Hydrologic Soil Group (select all that apply): DNRCS Type A NRCS Type B ONRCS Type C ONRCS Type D Approximate Depth to Groundwater (GW): GW Depth < 5 feet 0 5 feet < GW Depth < 10 feet X 10 feet < GW Depth < 20 feet GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): Watercourses Seeps Springs Wetlands It None Description /Additional Information: Description of Existing Site Topography and Drainage [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) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: OVERALL, THE PROJECT SITE IS RELATIVELY FLAT HAVING A MAXIMUM 1-2% GRADE FROM THE EXISTING STRUCTURE TO THE PARKING AREA TO THE SOUTH. THE SITE CONSISTS PRIMARILY OF URBAN HARDSCAPE FEATURES DRAINING TOWARDS AN EXISTING CONCRETE SWALE CONVEYING SITE STORMWATER EAST TO A LARGE CATCH BASIN AT THE FAR EAST END OF THE CITY PARKING AREA. Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: PROPOSED REDEVELOPMENT INCLUDES THE ADDITION OF 2,049 SF OF INTERIOR RESTUARANT SPACE AND 1,202 SF OUTDOOR DINING AREA ALONG WITH IMPROVED WALKWAY/ADA ACCESS AND SITE DRAINAGE. OVERALL SITE DRAINAGE CONVEYANCE WILL REMAIN THE SAME IN BOTH THE PRE- AND POST- CONSTRUCTION CONDITIONS. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): NEW PROPOSED IMPERVIOUS SITE FEATURES INCLUDE THE ADDITION OF 2,049 SF OF INTERIOR RESTUARANT SPACE, A 1,202 SF OUTDOOR DINING AREA, AND THE REPLACEMENT OF ADJACENT WALKWAYS AND PARKING AREAS FOR IMPROVED ADA ACCESS AND DRAINAGE. List/describe proposed pervious features of the project (e.g., landscape areas): NEW PROPOSED PERVIOUS SITE FEATURES INCLUDE TWO 16 SF TREE WELLS IN THE NEW OUTDOOR DINING AREA AS WELL AS THE REPLACEMENT OF THE PLANTER BOXES ALONG THE EXISTING RESTAURANT ENTRANCE AND THE ADDITION OF A PLANTER BOX ALONG THE NEW OUTDOOR DINING AREA. Does the project include grading and changes to site topography? X Yes ONo Description /Additional Information: GRADING IMPROVEMENTS ARE DESIGNED TO BRING THE SITE UP TO CODE BY PROVIDING ADA ACCESS AS WELL AS IMPROVED DRAINAGE CONSISTING OF A 2% SLOPE AWAY FROM THE BUILDING FOR THE FIRST 10' AND AN OVERALL 1-2% REMAINING SLOPE FROM THE PARKING AREA TO THE EXISTING CONCRETE SWALE. OVERALL SITE DRAINAGE CONVEYANCE WILL REMAIN THE SAME IN BOTH THE PRE- AND POST- CONSTRUCTION CONDITIONS. Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? X Yes 0 N Description / Additional Information: ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit BMP Inspection/Maintenance S Reponsible Inspection! Maintenance Minimum Frequency of BMP Party(s) Activities Required Activities MAINTENANCE INDICATOR ACCUMULATION OF SEDIMENT, LITTER, OR DEBRIS; STANDING WATER IN TREE-WELLS FOR LONGER THAN 96 HOURS FOLLOWING A STORM EVENT TREE WELL (SD-1) OWNER MAINTENANCE ACTION MAKE APPROPRIATE CORRECTIVE MEASURES SUCH AS INSPECTING / UNCLOGGING ORIFICE OPENING, ADJUSTING IRRIGATION SYSTEM, REMOVING OBSTRUCTIONS OF DEBRIS OR INVASIVE VEGETATION, CLEARING UNDERDRAINS (WHERE APPLICABLE), OR REPAIRING / REPLACING CLOGGED OR COMPACTED SOILS. MAINTENANCE INDICATOR ACCUMULATION OF SEDIMENT, LITTER, OR DEBRIS IN ERAIN INFILTRATION BASIN AND PRE-TREATMENT DEVICE AT CATCH INFILTRATION OWNER BASIN TANK (INF-1) MAINTENANCE ACTION REMOVE AND PROPERLY DISPOSE ACCUMULATED MATERIALS. MAINTENANCE INDICATOR STANDING WATER IN SUBSURFACE INFILTRATION GALLERY FOR LONGER THAN 96 HOURS FOLLOWING A STORM EVENT MAINTENANCE ACTION ON 'WNER THIS CONDITION REQUIRES INVESTIGATION OF WHY [ECORAIN 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. ATTACHMENT 3 Structural BMP Maintenance Information ATTACHMENT 2 BACKUP FOR POP HYDROMODIFICATION CONTROL MEASURES Indicate which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment 2a Hydromodification Management 0 Included Exhibit (Required) See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse 0 Exhibit showing project drainage Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA is required, additional analyses are Critical Coarse Sediment Yield optional) Area Map (Required) See Section 6.2 of the BMP Design Optional analyses for Critical Coarse Manual. Sediment Yield Area Determination 6.2.1 Verification of Geomorphic Landscape Units Onsite 6.2.2 Downstream Systems / Sensitivity to Coarse Sediment 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite Attachment 2c Geomorphic Assessment of Receiving x Not performed Channels (Optional) Included See Section 6.3.4 of the BMP Design Manual. Attachment 2d Flow Control Facility Design and 0 Included Structural BMP Drawdown Calculations (Required) See Chapter 6 and Appendix G of the BMP Design Manual Appendix E: BMP Design Fact Sheets Iteratively determine the surface ponding required to provide infiltration storage to reduce flow rates and durations to allowable limits while adhering to the maximum 36-hour drawdown time. Flow rates and durations can be controlled using flow splitters that route the appropriate inflow amounts to the infiltration basin and bypass excess flows to the downstream storm drain system or discharge point. If an infiltration basin cannot fully provide the flow rate and duration control required by this manual, an upstream or downstream structure with appropriate storage volume such as an underground vault can be used to provide additional control. After the infiltration basin has been designed to meet flow control requirements, calculations must be completed to verify if storm water pollutant control requirements to treat the DCV have been met. E-39 February 2016 Appendix E: BMP Design Fact Sheets Slung and Design Intent/Rationale Inflow and outflow structures are accessible by required equipment (e.g., Maintenance will prevent dogging and ensure vac tor truck) for inspection and proper operation of the flow control i structures. maintenance. Inflow velocities are limited to 3 ft/s or less or use energy dissipation methods High inflow velocities can cause erosion, scour 0 (e.g., riprap, level spreader) for and/or channeling. concentrated inflows. Overflow is safely conveyed to a downstream storm drain system or discharge point. Size overflow structure to pass 100-year peak flow for on-line basins and water quality peak flow for off-line basins. Planning for overflow lessens the risk of property damage due to flooding. fceptuai Design and Sizing Approach for Storm Wafer Pollutant Control - - To design infiltration basins for storm water pollutant control only (no flow control required), the following steps should be taken: Verify that siting and design criteria have been met, including placement and basin area requirements, forebay volume, and maximum slopes for basin sides and bottom. Calculate the DCV per Appendix B based on expected site design runoff for tributary areas. Use the sizing worksheet (Appendix B.4) to determine if full infiltration of the DCV is achievable based on the infiltration storage volume calculated from the surface ponding area and depth for a maximum 36-hour drawdown time. The drawdown time can be estimated by dividing the average depth of the basin by the design infiltration rate. Appendix D provides guidance on evaluating a site's infiltration rate. (Conceptual Design and Sizing Approach for Storm Water Pollutant Treatment and Flow Control T Control of flow rates and/or durations will typically require significant surface ponding volume, and therefore the following steps should be taken prior to determination of storm water pollutant control design. Pre-development and allowable post-project flow rates and durations should be determined as discussed in Chapter 6 of the manual. 1. Verify that siting and design criteria have been met, including placement and basin area requirements, forebay volume, and maximum slopes for basin sides and bottom. E-38 February 2016 Appendix E: BMP Design Fact Sheets also be designed for flow rate and duration control by providing additional infiltration storage through increasing the surface ponding volume. rDesign Criteria and Considerations 1 Infiltration basins must meet the following design criteria. Deviations from the below criteria may be approved at the discretion of the City Engineer if it is determined to be appropriate: Siting and Design Intent/Rationale Placement observes geotechnical recommendations regarding potential Must not negatively impact existing site D hazards (e.g., slope stability, landslides, geotechnical concerns. liquefaction zones) and setbacks (e.g., slopes, foundations, utilities). Selection and design of basin is based Must operate as a full infiltration design and 0 on infiltration feasibility criteria and must be supported by drainage area and in-situ appropriate design infiltration rate (See infiltration rate feasibility findings. Appendix C and D). Finish grade of the facility is S 2% (0% Flatter surfaces reduce erosion and 0 recommended). channelization with the facility. Settling forebay has a volume? 25% of A forebay to trap sediment can decrease facility volume below the forebay frequency of required maintenance. overflow. Prolonged surface ponding reduce volume available to capture subsequent storms. 0 Infiltration of surface ponding is limited The applicant has an option to use a different to a 36-hour drawdown time. drawdown time up to 96 hours if the volume of the facility is adjusted using the percent capture method in Appendix B.4.2. Minimum freeboard provided is ~!1 Freeboard minimizes risk of uncontrolled 0 foot. surface discharge. Gentler side slopes are safer, less prone to E] Side slopes are = 3H:1V or shallower, erosion, able to establish vegetation more quickly and easier to maintain. Inflow and Overflow Structures E-37 February 2016 Appendix E: BMP Design Fact Sheets MAINTENANCE ACCESS OVERFLOW STRUCTURE Al SLOPE________ 31 MAX. SIDE RIPRAP FOR ENERGY ' BERM '. VEGETATED SIDE OVERALL BASIN: DISSIPATION SLOPES AND BOTTOM L:W RATIO 2: 2:1 MIN. 2% OF MAINTENANCE ACCESS TRIBUTARY AREA PLAN NOT TO SCALE BERM / r MIN. 1 FREEBOARD MAINTENANCE ACCESS - MAINTENANCE I I OVERFLOW STRUCTURE ACCESS I I RIPRAP I I SURFACE L--------JJ [POING INFLOW PIPE—' "Y).W..Ys \?Y'%' .'Y?w%w%v" ' 'Y1Y U EXISTING IJNCOMPACTED OUTLET PIPE PERVIOUS SOILS SECTION A-A' NOT TO SCALE Typical plan and section view of an Infiltration BMP Design Adaptations for Project Goals Full infiltration BMP for storm water pollutant control. Infiltration basins can be used as a pollutant control BMP, designed to infiltrate runoff from direct rainfall as well as runoff from adjacent areas that are tributary to the BMP. Infiltration basins must be designed with an infiltration storage volume (a function of the surface ponding volume) equal to the full DCV and able to meet drawdown time limitations. Integrated storm water flow control and pollutant control configuration. Infiltration basins can E-36 February 2016 Appendix E: BMP Design Fact Sheets E.8 INF-1 Infiltration Basin MS4 Permit Category Retention Manual Category Infiltration Applicable Performance Standard Pollutant Control Flow Control Primary Benefits Volume Reduction Peak Flow Attenuation Photo Credit: http://www.stormwaterpan'ners. com/facilities/basin.html Description An infiltration basin typically consists of an earthen basin with a flat bottom constructed in naturally pervious soils. An infiltration basin retains storm water and allows it to evaporate and/or percolate into the underlying soils. The bottom of an infiltration basin is typically vegetated with native grasses or turf grass; however other types of vegetation can be used if they can survive periodic inundation and long inter-event dry periods. Treatment is achieved primarily through infiltration, filtration, sedimentation, biochemical processes and plant uptake. Infiltration basins can be constructed as linear trenches or as underground infiltration galleries. Typical infiltration basin components include: Inflow distribution mechanisms (e.g., perimeter flow spreader or filter strips) Energy dissipation mechanism for concentrated inflows (e.g., splash blocks or riprap) Forebay to provide pretreatment surface pondirig for captured flows Vegetation selected based on basin use, climate, and ponding depth Lncompacted native soils at the bottom of the facility Overflow structure E-35 February 2016 Appendix E: BMP Design Fact Sheets Evapotranspiration credit of 0.1 * amount of soil volume installed; and Infiltration credit calculated using sizing procedures in Appendix B.4. E-20 February 2016 Appendix E: BMP Design Fact Sheets Siting and Design Intent/Rationale must be reduced proportionately to the actual tributary area. - Design requirement to ensure that the Inlet opening to the tree that is at least 18 runoff from the tributary area is not inches wide. bypassed. Different inlet openings and drops in grade may be allowed at the discretion of A minimum 2 inch drop in grade from the inlet the City Engineer if calculations are to the finish grade of the tree. shown that the diversion flow rate Grated inlets are allowed for pedestrian circulation. Grates need to be ADA compliant and have sufficient slip resistance. (Appendix B.1.2) from the tributary area can be conveyed to the tree. In cases where the inlet capacity is limiting the amount of runoff draining to the tree, the tree credit volume must be reduced proportionately. [Conceptual Design and Sizing Approach for Site Design 1 Determine the areas where tree wells can be used in the site design to achieve incidental treatment. Tree wells reduce runoff volumes from the site. Refer to Appendix B.2. Document the proposed tree locations in the SWQMP. 2. When trees are proposed as a storm water pollutant control BMP, applicant must complete feasibility analysis in Appendix C and D and submit detailed calculations for the DCV treated by trees: Document the proposed tree locations, feasibility analysis and sizing calculations in the SWQMP. The following calculations should be performed and the smallest of the three should be used as the volume treated by trees: a. Delineate the DMA (tributary area) to the tree and calculate the associated DCV. b. Calculate the required diversion flow rate using Appendix B.1.2 and size the inlet required to covey this flow rate to the tree. If the proposed inlet cannot convey the diversion flow rate for the entire tributary area, then the DCV that enters the tree should be proportionally reduced. For example, 0.5 acre drains to the tree and the associated DCV is 820 ft3. The required diversion flow rate is 0.10 ft3/s, but only an inlet that can divert 0.05 ft3/s could be installed. Then the effective DCV draining to the tree = 820 ft3 * (0.05/0.10) = 420 ft3 c. Estimate the amount of storm water treated by the tree by summing the following- E-19 February 2016 Appendix E: BMP Design Fact Sheets Siting and Design Intent/Rationale • Suspended pavement designs provide structural support without compaction Suspended pavement design was developed of the underlying layers, thereby where appropriate to minimize soil compaction promoting tree growth. and improve infiltration and filtration Recommended structural cells include U capabilities. poured in place concrete columns, Silva Suspended pavement was constructed with an Cells manufactured by Deeproot Green approved structural cell. Infrastructures and Stratacell and Stratavault systems manufactured by Citygreen Systems. The minimum soil volume ensures that there is adequate storage volume to allow for unrestricted A minimum soil volume of 2 cubic feet per evapotranspiration. square foot of canopy projection volume is A lower amount of soil volume may be U provided for each tree. Canopy projection area allowed at the discretion of the City is the ground area beneath the tree, measured Engineer if certified by a landscape at the drip line, architect or agronomist. The retention credit from the tree is directly proportional to the soil volume provided for the tree. Establishing Amended Soil regains greater storm water functions in the tree wells, provides increased treatment of Amended soil layer for tress shall be a pollutants and sediments that result from minimum of three feet deep and extend at least development and habitation, and twelve inches in all directions of the root ball U minimizes that need for some when planted. The length and width must landscaping chemicals, thus reducing ensure the appropriate volume for the species pollution through prevention. and site. For more details on Amended Soil, refer to Appendix E in County of San Diego BMP Design Manual. The minimum tributary area ensures that DCV from the tributary area draining to the the tree receives enough runoff to fully utilize tree is equal to or greater than the tree credit the infiltration and volume evapotranspiration potential provided. In cases where the minimum tributary area is not provided, the tree credit volume E-18 February 2016 Appendix E: BMP Design Fact Sheets Siting and Design Intent/Rationale Location of trees planted within private development follows city landscape guidelines. Building setback, utility alignments, vehicle and pedestrian line of sight are considered in tree selection and placement. Location of trees planted along public streets follows city requirements and guidelines. Vehicle and pedestrian line of sight are considered in tree selection and placement. Unless otherwise approved by the City Engineer the following minimum, tree separation distance is suggested: Roadway safety for both vehicular and pedestrian traffic is a key consideration for placement along public streets. Minimum U Improvement distance to Tree Well Traffic Signal, Stop sign 20 feet Underground Utility lines (except sewer) 5 feet Sewer Lines 10 feet Above ground utility structures (Transformers, 10 feet Hydrants, Utility poles, etc.) Driveways 10 feet Intersections (intersecting curb lines of two streets) 25 feet Underground utilities and overhead wires are considered in the design and avoided or Tree growth can damage utilities and circumvented. Underground utilities are routed overhead wires resulting in service U around or through the planter in suspended interruptions. Protecting utilities routed pavement applications. All underground through the planter prevents damage and utilities are protected from water and root service interruptions. penetration. E-17 February 2016 Appendix E: BMP Design Fact Sheets uses, and project goals Optional suspended pavement design to provide structural support for adjacent pavement without requiring compaction of underlying layers Optional root barrier devices as needed; a root barrier is a device installed in the ground, between a tree and the sidewalk, intended to guide roots down and away from the sidewalk in order to prevent sidewalk lifting from tree roots. Optional tree grates; to be considered to maximize available space for pedestrian circulation and to protect tree roots from compaction related to pedestrian circulation; tree grates are typically made up of porous material that will allow the runoff to soak through. Optional shallow surface depression for ponding of excess runoff Optional planter box drain Design Adaptations for Project Goals - - - Site design BMP to provide incidental treatment. Tree wells primarily functions as site design BMPs for incidental treatment. Benefits from tree wells are accounted for by adjustment factors presented in Appendix B.2. Trees as a site design BMP are only credited up to 0.25 times the DCV from the project footprint (with a maximum single tree credit volume of 400 ft3). Storm water pollutant control BMP to provide treatment. Applicants are allowed to design trees as a pollutant control BMP and obtain credit greater than 0.25 times the DCV from the project footprint (or a credit greater than 400 ft3 from a single tree). For this option to be approved by the City Engineer, applicant is required to do infiltration feasibility screening (Appendix C and D) and provide calculations supporting the amount of credit claimed from implementing trees within the project footprint. The City Engineer has the discretion to request additional analysis before approving credits greater than 0.25 times the DCV from the project footprint (or a credit greater than 400 ft' from a single tree). Design Criteria and Considerations Tree Wells must meet the following design criteria and considerations. Deviations from the below criteria may be approved at the discretion of the City Engineer if it is determined to be appropriate: Siting and Design Intent/Rationale Tree species is appropriately chosen for the development (private or public). For public rights-of-ways, city planning guidelines and Proper tree placement and species D zoning provisions for the permissible species selection minimizes problems such as and placement of trees are consulted. A list of pavement damage by surface roots and trees appropriate for site design are provided in poor growth. Appendix E.20 E-16 February 2016 Appendix E: BMP Design Fact Sheets E.2 SD-1 Tree Wells MS4 Permit Category Site Design Manual Category Site Design Applicable Performance Standard Site Design Primary Benefits olume Reduction Tree Wells (Source: County of San Diego LID Manual - EOA, Inc.) Description Trees planted to intercept rainfall and runoff from impervious areas can be used as storm water quality management measures that provide additional benefits beyond those typically associated with trees, including energy conservation, air quality improvement, and aesthetic enhancement. Typical storm water management benefits associated with trees include: Treatment of storm water - Storm water from impervious area should be directed the tree wells. Trees provide treatment through uptake of nutrients and other storm water pollutants (phytoremediation) and support of other biological processes that break down pollutants.. Canopy Interception of rainfall - tree surfaces (roots, foliage, bark, and branches) intercept, evaporate, store, or convey precipitation to the soil before it reaches surrounding impervious surfaces Reduced erosion - trees protect denuded area by intercepting or reducing the velocity of rain drops as they fall through the tree canopy Increased infiltration - soil conditions created by roots and fallen leaves promote infiltration Typical tree well system components include: Directing runoff from impervious areas through a drainage opening into a tree well planting area Trees of the appropriate species for site conditions and constraints Available growing space based on tree species, soil type, water availability, surrounding land E-15 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.2-1. DCV - 7.v, /. 4' Q"m '(ojfl? ilxgi 1IB I 85" percentile 24-hr storm depth from Figure B.I-I d= 0 SS inches 2 Area tributary to BMP (s) A= 0 ô S acres 3 Area weighted runoff factor (estimate using Appendix B.I.I and B.2.I) C , ( unitless 4 Tree wells volume reduction TCV cubic-feet 5 Rain barrels volume reduction RCV - cubic-feet 6 Calculate DCV = 33(O.C)(D.cI) (0. its) (3630 x C x d x A) - TCV - RCV DCV= 35D.5 cubic-feet If JBBS 3.f - 911 6 f i$W Ajiv, id JI Q9 : O.iBS ac(eS B-10 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods B.4.1 Simple Method - 44y) Stepwise Instructions: Compute DCV using Worksheet B.4-1. Estimate design infiltration rate using Form 1-9 in Appendix I. Design BMP(s) to ensure that the DCV is fully retained (i.e., no surface discharge during the design event) and the stored effective depth draws down in no longer than 36 hours. Worksheet B.4-1: Simple Sizing Method for Infiltration BMPs 1 T Simple Sizing Method for Infiltration Bmps I DCV (Worksheet B.2-1) DCV= cubic-feet 2 Estimated design infiltration rate (Form 1-9 in Appendix Kd— V-'J/3 Available BMP surface area ABMP 23 sq-ft Average effective depth in the BMP footprint D = feet - (DCV/ABMP) 5 Drawdown time, T (D *12/}() T= 12. ,2. hours 6 Provide alternative calculation of drawdown time, if needcd. R% j:IZ.ZS SQ. ecmw\ vmk t' )(2.2S r~A'~Mqi • ZOO 4601 Z%I2SS+ ,c(.4t) Notes: Drawdown time must be less than 36 hours. This criterion was set to achieve average annual capture of 80% to account for back to back storms (See rationale in Section B.4.3). In order to use a different drawdown time, BMPs should be sized using the percent capture method (Section B.4.2). The average effective depth calculation should account for any aggregate/media in the BMP. For example, 4 feet of stone at a porosity of 0.4 would equate to 1.6 feet of effective depth. This method may overestimate drawdown time for BMPs that drain through both the bottom and walls of the system. BMP specific calculations of drawdown time may be provided that account for BMP-specific geometry. is J B-18 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.2-1. DCV -. C.cWo,y life Wet/S (a a) )$ \Imix' I 85" percentile 24-hr storm depth from Figure B.1-1 6 inches 2 Area tributary to BMP (s) A= acres Area weighted runoff factor (estimate using Appendix , 3 B.I.1 and B.2.I) C .10 unitless IO7Z4S 4 Tree wells volume reduction TCV= z 2.0 cubic-feet 5 Rain barrels volume reduction RCV= cubic-feet Calculate DCV = —20 6 (3630 x C x d x A) - TCV - RCV DCV= cubic-feet B-10 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods B.4.1 Simple Method - O.xttko' O4U Ttfe WeIt (Z Stepwise Instructions: Compute DCV using Worksheet B.4-1. Estimate design infiltration rate using Form 1-9 in Appendix I. Design BMP(s) to ensure that the DCV is fully retained (i.e., no surface discharge during the design event) and the stored effective depth draws down in no longer than 36 hours. Worksheet B.4-1: Simple Sizing Method for Infiltration BMPs Bob 1 DCV (Worksheet B.2-1) DCV= I S.V1 cubic-feet 2 Estimated design infiltration rate (Form 1-9 in Appendix 11) in/hr 3 1 Available BM? surface area ABMP 32... sq-ft Average effective depth in the BMP footprint D O 4 feet - (DCV/ABMP) 5 Drawdown time, T (D *12/J(.,) T= 3 .(fl hours 6 Provide alternative calculation of drawdown time, if needed. 3•(fl < 3( OK I nj Notes: Drawdown time must be less than 36 hours. This criterion was set to achieve average annual capture of 80% to account for back to back storms (See rationale in Section B.4.3). In order to use a different drawdown time, BMPs should be sized using the percent capture method (Section B.4.2). The average effective depth calculation should account for any aggregate/media in the BMP. For example, 4 feet of stone at a porosity of 0.4 would equate to 1.6 feet of effective depth. This method may overestimate drawdown time for BMPs that drain through both the bottom and walls of the system. BMP specific calculations of drawdown time may be provided that account for BMP-specific geometry. B-18 February 2016 ATTACHMENT I POLLUTANT CONTROL BMP DESIGN WORKSHEETS! CALCULATIONS Appendix I: Forms and Checklists r I A__. f) j WU-ILtVsrrIIUPJ a'tr ___ JFactor tsII Safety and UDesign IInfiltration[fj r!JtIjII Form 1-9 I . Assigned Factor ' Product (p) Factor Category Factor Description Weight (w) Value (v) p = w xv Soil assessment methods 0.25 Predominant soil texture 0.25 Suitability Site soil variability 0.25 A Assessment Depth to groundwater / impervious layer 025 Suitability Assessment Safety Factor, S = Zp Level of pretreatment/ expected 0.5 sediment loads B Design Redundancy/resiliency 0.25 Compaction during construction 0.25 Design Safety Factor, Sn = Ep Combined Safety Factor, S,= SA x SB (4 Observed Infiltration Rate, inch/hr, Kobsemed ô u ilw (corrected for test-specific bias) Design Infiltration Rate, in/hr, Kta4, = / Si I (.S Supporting Data Briefly describe infiltration test and provide reference to test forms: rs- frric!ep su EWT W)TED o./0/j( "GEOTECHNICAL INVESTIGATION, PROPOSED BUILDING EXPANSION AND PARKING IMPROVEMENTS, BLUEWATER GRILL RESTAURANT, 417 CARLSBAD VILLAGE DRIVE CARLSBAD, CALIFORNIA" BY SMS GEOTECHNICAL SOLUTIONS, INC. 1-7 February 2016 ATTACHMENT ID FORM 1-8, CATEGORIZATION OF INFILTRATION FEASIBILITY CONDITION ATTACHMENT IAIIB DMA EXHIBIT AND TABLE ATTACHMENT I BACKUP FOR PDP POLLUTANT CONTROL BMPS Check which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment I DMA Exhibit (Required) X Included See DMA Exhibit Checklist on the back of this Attachment cover sheet. (24"x36" Exhibit typically required) Attachment lb Tabular Summary of DMAs Showing X Included on DMA Exhibit in DMA ID matching DMA Exhibit, DMA Attachment 1 Area, and DMA Type (Required)* 0 Included as Attachment I b, separate from DMA Exhibit *Provide table in this Attachment OR on DMA Exhibit in Attachment 1 Attachment lc Form 1-7, Harvest and Use Feasibility 0 Included Screening Checklist (Required unless X Not included because the entire the entire project will use infiltration project will use infiltration BMPs BMPs) Refer to Appendix 13.3-I of the BMP Design Manual to complete Form 1-7. Attachment Id Form 1-8, Categorization of Infiltration X Included Feasibility Condition (Required unless 0 Not included because the entire the project will use harvest and use project will use harvest and use BMPs) BMPs Refer to Appendices C and D of the BMP Design Manual to complete Form 1-8. Attachment le Pollutant Control BMP Design X Included Worksheets I Calculations (Required) Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design guidelines Structural BMP Summary Information [Copy this page as needed to provide Information for each individual proposed structural BMP] Structural BMP ID No. BMP-2 DWG No. 4924A Type of structural BMP: Retention by harvest and use (HU-1) X Retention by infiltration basin (INF-1) Retention by bioretention (INF-2) Retention by permeable pavement (lNF-3) Partial retention by biofiltration with partial retention (PRA) Bioflltration (BF-1) 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) Detention pond or vault for hydromodification management Other (describe in discussion section below) Purpose: X Pollutant control only Hydromodification control only Combined pollutant control and hydromodification control Pre-treatment/forebay for another structural BMP Other (describe in discussion section below) Discussion (as needed): THE PROPOSED 300 SF ECORAIN INFILTRATION BASIN (INF-1) WILL TREAT THE ENTIRE 12,994 SF SITE WITH THE EXCEPTION OF THE NEW 1,202 SF OUTDOOR DINING AREA WHICH WILL BE TREATED WITH TWO TREE WELLS (SD-1). THE INFILTRATION BASIN WILL HAVE A PRE-TREATMENT FILTER FOR COARSE SEDIMENT AND TRASH REMOVAL AT THE NEW INTAKE CATCH BASIN. Identification of Receiving Water Pollutants of Concern Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): THE PROJECT SITE IS LOCATED APPROXIMATELY 0.5 MILES EAST OF THE PACIFIC OCEAN WITHIN THE BUENA VISTA CREEK WATERSHED WHICH DISCHARGES TO THE PACIFIC OCEAN VIA THE BUENA VISTA LAGOON. 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 TMDL5 for the impaired water bodies: 303(d) Impaired Water Body Pollutant(s)IStressor(s) TMDLs BUENA VISTA LAGOON NUTRIENTS I EUTROPHICATI N BUENA VISTA LAGOON SEDIMENTATION I SILTATION BUENA VISTA LAGOON BACTERIA Identification of Project Site Pollutants Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see BMP Design Manual Appendix B.6): Pollutant Not Applicable to the Project Site Anticipated from the Project Site Also a Receiving Water Pollutant of Concern Sediment X X Nutrients X X Heavy Metals X X Organic Compounds X X Trash & Debris X Oxygen Demanding Substances X OiI& Grease X Bacteria & Viruses X X Pesticides X Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP] Structural BMP ID No. BMP-1 DWG No. 492-4A Type of structural BMP: Retention by harvest and use (HU-I) Retention by infiltration basin (INF-I) Retention by bioretention (INF-2) Retention by permeable pavement (INF-3) Partial retention by biofiltration with partial retention (PR-1) Bioflltration (BF-1) 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) Detention pond or vault for hydromodification management X Other (describe in discussion section below) Purpose: X Pollutant control only Hydromodification control only Combined pollutant control and hydromodification control Pre-treatmentlforebay for another structural BMP D Other (describe in discussion section below) Discussion (as needed): THE PROPOSED SITE INCLUDES A NEW 1,202 SF OUTDOOR DINING AREA WHICH WILL BE TREATED WITH TWO TREE WELLS (SD-1) AS THE SITE/STRUCTURAL BMP. PDP Structural BMPs All POPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of POP structural BMPs for storm water pollutant control must be based on the selection process described in Chapter 5. PDPs subject to hydromodification management requirements must also implement structural BMPs for flow control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both storm water pollutant control and flow control for hydromodification management can be achieved within the same structural BMP(s). PDP structural BMPs must be verified by the City. at the completion of construction. This may include requiring the project owner or project owner's representative to certify construction of the structural BMPs (see Section 1.12 of the BMP Design Manual). POP structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual). Use this form to provide narrative description of the general strategy for structural BMP implementation at the project site in the box below. Then complete the POP structural BMP summary information sheet for each structural BMP within the project (copy the BMP summary information page as many times as needed to provide summary information for each individual structural BMP). Describe the general strategy for structural BMP 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 BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether pollutant control and flow control BMPs are integrated together or separate. THE EXISTING SITE HAS AN AREA OF APPROXIMATELY 12,994 SF WITH 12,407 SF (95%) CONSISTING OF IMPERVIOUS SURFACES. THE PROPOSED PROJECT WILL REDEVELOP AND/OR ADD 8,755 SF OF IMPERVIOUS AREA RESULTING IN A 70.5% CHANGE WHEN COMPARED TO THE EXISTING SITE THEREFORE REQUIRING THE ENTIRE SITE TO BE TREATED WITH STRUCTURAL BMPS. TO ACCOMPLISH THIS, TWO TREE WELLS (BMP-1) ARE BEING ADDED TO THE NEW OUTDOOR PATIO AREA AND A NEW 300 SF UNDERGROUND INFILTRATION TANK (BMP-2) WILL BE INSTALLED UNDER THE REDEVELOPED PARKING AREA. OVERALL, THE DRAINAGE PATTERN OF THE EXISTING SITE IS BEING MAINTAINED. THE ONLY CHANGE IS THE ADDITION OF THE BMPS TO REDUCE THE AMOUNT OF WATER LEAVING THE SITE THROUGH EXISTING CITY STORM DRAINS. THE ONLY STORM WATER THAT COULD POTENTIALLY LEAVE THE SITE WILL DO SO THROUGH OVERFLOW LINES AT BOTH THE TREE WELLS AND INFILTRATION TANK. FINALLY, THE EXISTING OFF-SITE TRIBUTARY AREAS PRODUCING RUN-ON ARE BEING ACCOUNTED FOR WITH THE BMP OVERFLOW DEVICES AND HAVE BEEN SIZED FOR THE 100-YEAR STORM EVENT. Source Control Requirement (continued) Applied? SD-6 Runoff Collection 0 Yes 0 No I 0 N/A Discussionfjustification if SD-6 not implemented: SD-7 Landscaping with Native or Drought Tolerant Species I i Yes I 0 No I 0 N/A Discussion/justification if SD-7 not implemented: SD-8 Harvesting and Using Precipitation I 0 Yes 0 No I 0 NIA Discussion/justification if SD-8 not implemented: Not used due to lack of pervious area on existing site. Two tree-well infiltration BMPs used instead. E-36 Page 4 of 4 Revised 03/16 Site Design BMPs All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See Chapter 4 and Appendix E.2 thru E.6 of the 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 BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of the Model BMP Design Manual. Discussion /justification is not required. "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. "N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be provided. Source Control Requirement Applied? SD-1 Maintain Natural Drainage Pathways and Hydrologic Features 0 Yes I 0 No 1 0 N/A Discussion/justification if SD-I not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation I 0 Yes I 0 No 1 0 N/A Discussion/justification if SD-2 not implemented: SD-3 Minimize Impervious Area I J Yes I 0 No I 0 N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction I i Yes I 0 No I 0 N/A 'Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion I0 Yes I 0 No I 0 N/A Discussion/justification if SD-5 not implemented: E-36 Page 3 of 4 Revised 03/16 On-site storm drain inlets: (1) Show locations of inlets on drawings; (2) Mark all inlets with the words "No Dumping! Flows to Bay" or similar. Interior floor drains and elevator shaft sump pumps: (1) State that interior floor drains and elevator shaft sump pumps will be plumbed to sanitary sewer. Need for future indoor & structural pest control: (1) Note building design features that discourage entry of pests. Landscape/Outdoor Pesticide Use: (1) On drawings, show locations of existing trees or areas of shrubs and ground cover to be undisturbed and retained; (2) Design landscaping to minimize irrigation and runoff, to promote surface infiltration where appropriate, and to minimize the use of fertilizers and pesticides that can contribute to storm water pollution. S. Food service: (1) On drawings, show a note that this drain will be connected to a grease interceptor before discharging to the sanitary sewer. Refuse areas: (1) On drawings, show where site refuse and recycled materials will be handled and stored for pickup; (2) State that signs will be posted on or near dumpsters with the words "Do not dump hazardous materials here" or similar. Outdoor storage of equipment or materials: (1) On drawings, show any outdoor storage areas, including how materials will be covered. Show how areas will be graded and bermed to prevent run-on or runoff from area and protected from wind dispersal. Fire Sprinkler Test Water: (1) Provide a means to drain fire sprinkler test water to the sanitary sewer or approved BMP. Miscellaneous Drain or Wash Water: (1) Any drainage sumps onsite shall feature a sediment sump to reduce the quantity of sediment in pumped water; (2) Avoid roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff. Plazas, sidewalks, and parking lots: (1) Plazas, sidewalks, and parking lots shall be swept regularly to prevent the accumulation of litter and debris. Source Control Requirement (continued) Applied? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On Runoff, and Wind Dispersal l Yes 0 No [[:] N/A Discussion/justification if SC-4 not implemented: SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal 0 Yes C3 *No 0 N/A Discussionfjustification if SC-5 not implemented: SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance). J On-site storm drain inlets 0 Yes 0 No 0 N/A J Interior floor drains and elevator shaft sump pumps 0 Yes 0 No 0 N/A Interior parking garages 0 Yes 0 No 0 N/A Need for future indoor & structural pest control 0 Yes 0 No 0 N/A J Landscape/Outdoor Pesticide Use 0 Yes 0 No 0 N/A Pools, spas, ponds, decorative fountains, and other water features 0 Yes 0 No 0 N/A 121 Food service 0 Yes 0 No 0 N/A 121 Refuse areas 0 Yes 0 No 0 N/A Industrial processes 0 Yes 0 No 0 N/A 121 Outdoor storage of equipment or materials 121 Yes 0 No 0 N/A Vehicle and Equipment Cleaning 0 Yes 0 No 0 N/A Vehicle/Equipment Repair and Maintenance 0 Yes 0 No 0 N/A Fuel Dispensing Areas 0 Yes 0 No 0 N/A Loading Docks 121 Yes 0 No 0 N/A 121 Fire Sprinkler Test Water 121 Yes 0 No 0 N/A 121 Miscellaneous Drain or Wash Water 0 Yes 0 No 0 N/A 121 Plazas, sidewalks, and parking lots 121 Yes 0 No 0 N/A For "Yes answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers. See next page for responses. E-36 Page 2 of 4 Revised 03/16 (city of Carlsbad STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov Project Information Project Name: BWG CARLSBAD Project ID: RP 92-I0(A)/CDP 92-08(A) DWG No. or Building Permit No.: PC16-000I Source Control BMPs All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and Appendix E.Iof the 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 and/or Appendix E.1 of the Model BMP Design Manual. Discussionfjustification is not required. "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. "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 may be provided. Source Control Requirement Applied? SC-1 Prevention of Illicit Discharges into the MS4 0 Yes 0 No 0 N/A Discussion/justification if SC-I not implemented: SC-2 Storm Drain Stenciling or Signage 0 Yes 0 No 0 N/A Discussion/justification if SC-2 not implemented: SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind J es Y N 0 0 0 N/A Dispersal Discussion/justification if SC-3 not implemented: E-36 Page 1 of 4 1 Revised 03/16 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 City codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. THE PROJECT INVOLVES THE REDEVELOPMENT OR CREATION OF MORE THAN 50% OF THE SITE'S EXISTING IMPERVIOUS SURFACE AREA SO WE ARE REQUIRED TO TREAT THE ENTIRE SITE, INCLUDING THE EXISTING STRUCTURE, WITH STRUCTURAL BMPs. 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. Flow Control for Post-Project Runoff* *This Section only required if hydromodification management requirements apply List and describe point(s) of compliance (POCs) for flow control for hydromodification management (see Section 6.3.1). For each POC, provide a POC identification name or number correlating to the project's HMP Exhibit and a receiving channel identification name or number correlating to the project's HMP Exhibit. Has a geomorphic assessment been performed for the receiving channel(s)? No, the low flow threshold is 0.1 Q2 (default low flow threshold) Yes, the result is the low flow threshold is 0.1 Q2 Yes, the result is the low flow threshold is 0.3Q2 0 Yes, the result is the low flow threshold is 0.5Q2 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion I Additional Information: (optional) Hydromodification Management Requirements Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? Yes, hydromodification management flow control structural BMPs required. X No, the project will discharge runoff directly to existing underground storm drains discharging directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. No, the project will discharge runoff directly to conveyance channels whose bed and bank are concrete-lined all the way from the point of discharge to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. No, the project will discharge runoff directly to an area identified as appropriate for an exemption by the WMAA for the watershed in which the project resides. Description I Additional Information (to be provided if a 'No' answer has been selected above):. ALL STORM WATER WILL BE TREATED BY EITHER TREE WELLS OR AN INFILTRATION PIT AND OVERFLOW TO EXISTING STORM DRAINS. Critical Coarse Sediment Yield Areas* *This Section only required if hydromodification management requirements apply Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas exist within the project drainage boundaries? Yes No, No critical coarse sediment yield areas to be protected based on WMAA maps If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed? 06.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite 06.2.2 Downstream Systems Sensitivity to Coarse Sediment 06.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite 0 No optional analyses performed, the project will avoid critical coarse sediment yield areas identified based on WMAA maps If optional analyses were performed, what is the final result? 0 No critical coarse sediment yield areas to be protected based on verification ofGLUs onsite 0 Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. 0 Critical coarse sediment yield areas exist and require protection. The project will implement management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion I Additional Information: Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply): 1K On-site storm drain inlets X Interior floor drains and elevator shaft sump pumps Interior parking garages X Need for future indoor & structural pest control X Landscape/Outdoor Pesticide Use Pools, spas, ponds, decorative fountains, and other water features X Food service X Refuse areas Industrial processes XOutdoor storage of equipment or materials XVehicle and Equipment Cleaning Vehicle/Equipment Repair and Maintenance Fuel Dispensing Areas Loading Docks X Fire Sprinkler Test Water X Miscellaneous Drain or Wash Water X Plazas, sidewalks, and parking lots