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Home My WebLink AboutCT 15-05; QUARRY CREEK PLANNING AREA R3; STORM WATER MANAGEMENT PLAN; 2015-10-28FINAL STORM WATER MANAGEMENT PLAN FOR QUARRY CREEK PLANNING ARE~R .. J ..... City of Carlsbad, CA CT 15-05 I PUD 15-13 PREPARED FOR: PRESIDIO CORNERSTONE QC, LLC 4365 Executive Drive, Suite 600 SAN DIEGO, CA 92121 (858)-458-9700 PREPARED BY: BB&D~ PLANNING ENGINEERING SURVEYING 3990 RUFFIN ROAD, SUITE 120 SAN DIEGO, CA 92123 858-560-1141 JOB NO. 71470.60 October 28, 2015 NOV 18 2015 TABLE OF CONTENTS 1.0 Scope of Report 1.1 Declaration of Responsible Charge 2.0 Summary of Project Information 3.0 Pre-Project Site Conditions and Drainage Patterns Narrative 3.1 Site Development Constraints 4.0 Proposed Site Development and Drainage Patterns Narrative 4.1 Site Development Opportunities 5.0 Sources of Pollutants from the Existing Site Narrative 6.0 Project Hydrologic Location 7.0 Identification of 303( d) Impaired Receiving Waters 8.0 Identification of Pollutants Associated with Priority Project Category 9.0 Identification of Pollutants of Concern 10.0 Hydromodification Management Plan (HMP) Applicability Determination 11.0 Summary of HMP Compliance Approach 12.0 Permanent Source Control Best Management Practices (BMPs) 13.0 Identification of BMPs Applicable to Individual Priority Project Categories 14.0 Implementation of Site Design Low Impact Development (LID) Practices 15.0 Water Quality Treatment Calculations 16.0 Comparison of Water Quality Treatment Calculations 17.0 Relative Effectiveness of Project Treatment Facilities and Integrated Management Practices (IMPs) 18.0 Summary and Conclusion Narrative QUARRY CREEK R-3 Priority Development Project-SWMP Page i SB&OINC. 19.0 Figures Vicinity Map Proposed DMA Exhibit (map pocket) 20.0 Attachments City of Carlsbad Storm Water Standards Questionnaire Permanent BMP Certification Form (see Project Design Consultants [PDC] regional report) HMP Calculations (see PDC regional report) QUARRY CREEK R-3 Priority Development Project -SWMP Page ii SB&OINC. 1.0 Scope of Report A master or regional report, "Storm Water Management Plan Quarry Creek," dated March 19, 2015, was prepared for the Quarry Creek project by Project Design Consultants (PDC). The PDC regional report summarizes the storm water requirements for the entire Quarry Creek project, including bioretention basin 3-3 located northeast of the R-3 site, as show on sheet 10 of Drawing No. 484-SA. Furthennore, the PDC regional report details the design and modeling of the bioretention basin which includes continuous simulation modeling (SDHM), rather than the BMP sizing tables. This report is limited to documenting the following at the Planning Area R-3 (R-3) site: A) Site Design B) Source Control C) Tributary area and impervious area, including comparisons to those used in the PDC report D) Compliance and consistency with the assumptions and design parameters used in the PDC regional report. 1.1 Declaration of Responsible Charge This Storm Water Management Plan (SWMP) has been prepared under the direction of the following Professional Civil Engineer. The Professional Civil Engineer (Engineer) attests to the technical information contained herein, and to the engineering data upon which the following design, recommendations, conclusions and decisions are based. The selection, sizing, and design of the storm water treatment and other control measures in this report meet the requirements of the Regional Water Quality control Board Order R9-2007-0001 and subsequent amendments. QUARRY CREEK R-3 (LOT 3) Allen Butcher Print Name SB&O Inc. Company QUARRY CREEK R-3 Priority Development Project-SWMP Page 1 SB&O INC. 2.0 Summary of Project Information Item . .· .. Project Name Application Number(s) Project Address Assessor Parcel Number(s) Total Project Area Proposed Project Description and Land Use Applicable Priority Development Project Categories Redevelopment Project that Creates or Replaces 5,000 square feet of Impervious Surface Project Disturbed Area Predevelopment Impervious Area Proposed Impervious Area Proposed Pervious Area Project Hydrologic Unit Watershed Project Hydrologic Soil Group Number of Discharge Locations Required to Implement HMP Number ofHMP Compliance Points Applicant Contact QUARRY CREEK R-3 Priority Development Project -SWMP Page 2 ' . Project Infotmatiol} ·.· ' ' : Quarry Creek Planning Area R-3 (Lot 3) DWG No. 848-5C Westerly terminus of existing Marron Road 167-040-11, -21 6.60 AC. Multifamily Residential [g) Housing Development of 10 or more dwelling units D Commercial Development of one acre and greater D Heavy Industry of one acre and greater D Automotive Repair Shop D Restaurant D Hillside Development greater than 5,000 square feet D Water Quality Environmentally Sensitive Area (WQESA) D Parking Lot [g) Street, Highways, and Freeways D Retail Gasoline Outlets [g) Land Disturbance greater than one acre D Increases or D Increases or [g) Not Replaces >50% of Replaces <50% of Applicable Pre-Project Imp. Pre-Project Imp. Surface Surface 6.598 AC/ 287,420 SF 0.000 AC/ 0 SF 3.565 AC/ 155,305 SF 3.033 AC I 132,115 SF Tijuana Hydrologic Unit DA IDB Joe l[g]D 1 Location [g) Yes J 0No 1 Locations (POC-3-3 Per SWMP 14-13) Jack Robson (858) 458-9700 jrobson@comerstonecommunities.com SB&O INC. 3.0 Pre-Project Site Conditions and Drainage Patterns Narrative The existing site, Planning Area R-3 (R-3), is part of the larger master plan development area Quarry Creek. The project is located in the City of Carlsbad (City), but is bordered to the east by the City of Oceanside. The project is situated west of College Boulevard, east of Interstate 5, and south ofHaymar Drive. The first phase of Quarry Creek included preparation of the large sheet graded pads, and construction of public roads, public utilities, and the LID facilities required for both current and future phases of the project. The master "Storm Water Management Plan Quarry Creek," dated March 19, 2015, by PDC, was prepared that used design assumptions to account :for future development o:fthe graded pad areas. The Bioretention Basin (treatment and hydromodification facilities) were sized to handle ultimate development of all Quarry Creek planning areas. This plan proved that the further design and development of the pad areas is consistent with the assumptions made in the master SWMP. The R-3 area is located in the southeastern portion of the Quarry Creek development. Currently, R-3 is a large sheet graded pad approximately 6.60 acres in area. The pad was graded with a 1% slope to the northwest, directed towards a temporary sediment basin and temporary storm drain outlet. This temporary storm drain is connected to an existing Type B-5 storm drain cleanout. The existing cleanout is located near the northeast intersection of Adobe Springs Road and El Saito Falls Street. The existing cleanout is connected to a 30" RCP storm drain that outlets to a bio-retention/hydro-modification basin located northwest of the intersection of Adobe Springs Road and El Saito Falls Street. QUARRY CREEK R-3 Priority Development Project-SWMP Page 3 SB&O INC. 3.1 Site Development Constraints A:pp)icable Site Development Constraints • CC. ccC • cC c D Limited Available Hydraulic Head 12.$] Impermeable Soils D High Groundwater D Contaminated Soils D Geotechnical Instability 12.$] Perimeter Conditions D High Intensity Land Use D Heavy Pedestrian Traffic D Heavy Vehicular Traffic D Restricted Right-of-Way D Existing Easements D Inadequate Down-Stream Drainage Infrastructure D Public Safety Concerns D Other: Comments: QUARRY CREEK R-3 Priority Development Project -SWMP Page4 cc SB&O INC. 4.0 Proposed Site Development and Drainage Patterns Narrative The R-3 area will be a multi-family residential development. A total of 88 units will be constructed, comprised of various attached product types (4-plex, 5-plex, and 6-plex row home style buildings). R-3 is approximately 6.60 acres, with a net developable area of approximately 5.15 acres. This yields a net project density of 17.09 dwelling units per acre, which corresponds to High Density Residential (HDR) per Table 3-1 "Runoff coefficients for Urban Areas" of the San Diego County Hydrology Manual. Along with the construction of the multi-family style buildings, private driveyvays, walkways, and a public "scenic river walk" trail will be constructed. The impervious portion ofthe site was calculated at 54%. This percentage is significantly lower than the percentage assumed in the master SWMP, which was 80%. Drainage will still flow towards the northeast portion ofthe site, consistent with existing conditions. All runoff is collected and discharged to the existing Type B-5 cleanout and 30" RCP stonn drain. The project will route runoff to the bio-retention basin 3-3 located northwest of the intersection of Adobe Springs Road and El Salto Falls Street, as intended in the regional SWMP. QUARRY CREEK R-3 Priority Development Project-SWMP Page 5 SB&O INC. 4.1 Site Development Opportunities Applicable ~ite Development Opportuiiities r:gj Adequate Available Hydraulic Head D Permeable Soils 0 Groundwater Separation 0 Geotechnical Stability 0 Perimeter Conditions r:gj Existing Natural Areas r:gj Undevelopable Areas r:gj Adequate Down Stream Drainage lnfrastructure 0 Other: Comments: QUARRY CREEK R-3 Priority Development Project -SWMP Page 6 > SB&O INC. 5.0 Sources of Pollutants from the Existing Site Narrative No known legacy pollutants QUARRY CREEK R-3 Priority Development Project-SWMP Page 7 SB&O INC. 6.0 Project Hydrologic Location llydrologi~ Unit llydtt?logic Area Carlsbad 904.00 Buena Vista Creek 904.20 QUARRY CREEK R-3 Priority Development Project-SWMP Page 8 .. ·Hydr?l6~c S11b~Area El Saito 904.21 SB&O INC. 7.0 Identification of 303( d) Impaired Receiving Waters ReceiVing Water ···• ~ Buena Vista Creek ~ Buena Vista Lagoon QUARRY CREEK R-3 Priority Development Project-SWMP Page 9 }'o,llutant(s) Causin~ .. J:mpairment to 3;()3( d) Receivina \Vater· Selenium Sediment Toxicity Nutrients Indicator Bacteria Sedimentation/ Siltation SB&O INC. 8.0 Identification of Pollutants Associated with Priority Project Category Priority Project Clltegory Detached Residential D Development Attached Residential cg] Development 0 Commercial Development D Heavy Industry or Industrial Development QUARRY CREEK R-3 Priority Development Project-SWMP Page 10 Gen~rafroUut~nt CategQries Sediment Nutrients Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides Sediment Nutrients Trash & Debris Oxygen Demanding Substances (if landscape exists on-site) Oil & Grease (if uncovered parking areas exist on-site) Bacteria & Viruses Pesticides Sediment (if landscape exists on-site) Nutrients (iflandscape exists on-site) Heavy Metals Organic Compounds (if uncovered parking areas exist on-site) Trash & Debris Oxygen Demanding Substances (includes solvents) Oil & Grease Bacteria & Viruses (ifland use includes food or animal waste products) Pesticides (includes solvents) Sediment Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease SB&O INC. 8.0 Identification of Pollutants Associated with Priority Project Category (continued) Priority Project Categories 0 Automotive Repair Shop 0 Restaurants 0 Hillside Development 0 Parking Lots 0 Retail Gasoline Outlets 0 Streets, Highways & Freeways QUARRY CREEK R-3 Priority Development Project -SWMP Page 11 .·· ... ·... . . . General Pollutant Categories Heavy Metals Organic Compounds (includes petroleum hydrocarbons and solvents) Trash & Debris Oil & Grease Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria· & Viruses Pesticides (iflandscape exists on-site) Sediments Nutrients Trash & Debris Oxygen Demanding Substances Oil & Grease Pesticides Sediments (if landscape exists on-site) Nutrients (iflandscape exists on-site) Heavy Metals Trash & Debris Oxygen Demanding Substances (if landscape exists on-site) Oil & Grease Pesticides (if landscape exists on-site) Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease Sediments Nutrients (if landscape exists on-site) Heavy Metals Organic Compounds (including petroleum hydrocarbons) Trash & Debris Oxygen Demanding Substances (includes solvents) Oil & Grease Bacteria & Viruses Pesticides (iflandscape exists on-site) SB&O INC. 9.0 Identification of Pollutants of Concern Pollutants Associated with Pfiority Prhject Category rg] Sediment rg) Nutrients D Heavy Metals D Organic Compounds rg) Trash & Debris rg] Oxygen Demanding Substances rg] Oil & Grease rg) Bacteria & Viruses rg] Pesticides QUARRY CREEK R-3 '' '' ' ' ' ' ' ' ., ' '' : Pqllutants Causing Impairment to 303( d) · Receiving Water(s) · D Chloride rg] Sediment/Siltation D Copper rg] Sediment Toxicity rg] Nutrients rg) Selenium D Phosphorus D Sulfates D Sediment D Total Nitrogen as N D Chloride D Sulfates D Eutrophic D Total Dissolved Solids rg] Nutrients D Total Nitrogen as N D Phosphorus D Toxicity D Copper D Sulfates D Manganese D Total Dissolved Solids D Sediment Toxicity D Toxicity D Eutrophic D Sediment Toxicity D Eutrophic D Nutrients rg] Sediment Toxicity D Eutrophic rg) Nutrients D Phosphorus D Eutrophic rg] Sediment Toxicity D Enterococcus D Eutrophic D Fecal Colifom1 D Copper D Eutrophic D Phosphate D Total Nitrogen as N D Toxicity D Total Dissolved Solids D Toxicity D Sulfates D Total Dissolved Solids D Total Nitrogen as N D Toxicity rg] Indicator Bacteria D Total Coliform rg] Sediment Toxicity D Sulfates D Toxicity Priority Development Project-SWMP Page 12 Pollutants ofContern .... ·. •• rg] Sediment rg) Nutrients D Heavy Metals D Organic Compounds rg] Trash & Debris rg] Oxygen Demanding Substances rg] Oil & Grease rg] Bacteria & Viruses rg] Pesticides SB&O INC. 10.0 Hydromodification Management Plan (HMP) Applicability Determination NO YES Figure 6-1. HMP Applicability Determination QUARRY CREEK R-3 Priority Development Project -SWMP Page 13 NO a NO 14. Hydromodificalion Controls Required Go to Figure 6-2 of Decision Majrix SB&O INC. 11.0 Summary of HMP Compliance Approach 0 Not Applicable-Project Exempt from HMP requirements 0 Determine/Identify Point(s) of Compliance 0 Utilize SCCWRP Screening Tools to determine Stream Susceptibility 0 J;>efault to·a High Susceptibility Stream (O.IQ2) [gj Utilize an appropriate HMP Sizing Tool to demonstrate HMP compliance~ ' 0 Utilize HMP Sizing Tables to demonstrate HMP compliance [gj Utilize an approved Continuous Simulation Model and compare pre- project and mitigated post-project flows to demonstrate HMP compliance 0HEC-HMS 0HSPF [gj SDHM 0SWMM ~ 0 Provide comprehensive, digital support data, calculation method and parameters, and calculation results on Compact Disk (CD) sufficient to duplicate study and support a RWQCB audit See "Storm Water Management Plan Quarry Creek" dated March 19,2015, by Project Design Consultants, for HMP compliance documentation. QUARRY CREEK R-3 Priority Development Project-SWMP Page 14 i SB&O INC. 12.0 Permanent Source Control Best Management Practices (BMPs) Sour~e Control BMP [2:1 Storm Drain Inlet Labeling Comment: ···.·· .. ·· •. ·. . •· . D Outdoor Material Storage Areas Comment: QUARRY CREEK R-3 Priority Development Project -SWMP Page 15 Applicable Impl~ritentfttion R:equirements [2:1 Provide prohibitive dumping placards and! OJ: signage [2:1 Post signage at public access points to deter prohibitive dumping [2:1 Maintain legibility of placards and signage D Not Applicable . · .· ·: ...... . .. ; : . • .... .·· ·.•: . . D Materials placed in an enclosure (e.g. cabinet, shed, or similar structure that prevents contact with rain, runoff or spillage to the storm water conveyance system) D Protected by secondary containment structures (e.g. berms, dikes, or curbs) and paved or sufficiently impervious to contain leaks and spills D The storage area is paved and sufficiently impervious to contain leaks and spills D Includes a roof or awning to minimize direct precipitation to the secondary containment area [2:1 Not Applicable SB&O INC. 12.0 Permanent Source Control BMPs (continued) Source .Control BMP 0 Common Trash Enclosure and Recyclable Material Storage Areas Comment: . .· · . •.·· .. [SJ Employ Integrated Pest Management (IPM) Practices Comment: QUARRY CREEK R-3 Priority Development Project -SWMP Page 16 .... App}i(~abie ln)plenu~nt~tion Ret]uir~llJ.ents . 0 Paved with an impervious surface 0 Designed not to allow run-on from adjoining areas 0 Screened or walled to prevent off-site transport of trash 0 Use trash containers with attached lids to exclude rain and maintain lids in closed position while not in use and/or include a roof or awning to minimize direct precipitation. D Acknowledgment that installation of storm dlrain inlets or area drains in designated trash storage areas is prohibited [SJ Not Applicable ...... . ·· ..... ·. .·· i . : > < ; . '· ... , . [SJ Plant pest-resistant or well-adapted plant varieties such as drought tolerant and/or native plants [SJ Discourage pests by modifying the site and landscaping design [SJ Distribute IPM educational materials to future occupants as part of the fmal engineering phase Operation and Maintenance Plan (O&M Plan) which addresses physical pest elimination techniques such as relying on natural enemies to consume pests, weeding, pruning, and etc. Emphasis placed on correct and limited use of pesticides as a last line of defense 0 Not Applicable SB&O INC. 12.0 Permanent Source Control BMPs (continued) Source Control Bl\fP ~ Use of Efficient Irrigation Systems & Drought Tolerant Landscape Design D Interior Floor Drains and Elevator Shaft Sump Pumps Comment: ... > .: . . .. ·.· QUARRY CREEK R-3 Priority Development Project-SWMP Page 17 AppliCable Implementation ·Requirements .. . .· ~· . . ... ' ~ Employ rain shutoff devices to prevent irrigation during and after precipitation ~ Design irrigation systems for the specific water requirements of each landscape area ~Use flow reducers or shutoff valves triggered by a pressure drop to control water loss in the event of broken sprinkler heads or lines ~ Provide water conservation educational materials to future occupants. D Not Applicable D Properly connected to a sanitary sewer QL D An alternate method, as approved by the City Engineer D Acknowledgment that direct connection of interior floor drains and elevator shaft pumps to private or public storm drain or sanitary sewer is not permissible ~ Not Applicable . .. SB&O INC. 12.0 Permanent Source Control BMPs (continued) Source Control BMP D Interior Parking Garages Equipped with Floor Drains Comment: ' :c ' ,'. rgj Pet Use Areas Comment: QUARRY CREEK R-3 Priority Development Project-SWMP Page 18 ,' Applicable: Implementation Requirements ,, , , ' ' " D Prohibit vehicle washing D Prohibit pressuring washing of parking surface in the parking garage and D Provide adequate treatment control BMPs to treat runoff prior to discharge to an MS4 and D Provide prohibitive dumping signage and floor drain marking; prominently displayed inside the parking garage and at the floor drains, respectively and; D hnplement dry clean-up methods for non-hazardous accidental spills D Equipped with a clarifier or other pretreatment facility D Properly connected to a sanitary sewer or, D An alternate method, as approved by the City Engineer D Acknowledgment that direct connection of interior floor drains and elevator shaft pumps to the sanitary sewer or storm water conveyance is not permissible rgj Not Applicable ·. ·. ·,: ' '. .···: .... '., ',' ':<,,, ' ·, :, rgj A pet waste station that includes eye level, post mounted signage which reads "pick-up after your pet'' or similar approved language and D A pet waste disposal receptacle equipped with a lid D Not Applicable SB&O INC. ' 13.0 Identification of BMPs Applicable to Individual Priority Project Categories Indiviifu1\l J?r,iQrity project Cate2ocy. D Private Roads Comment: '· ....... ... ·: , ... rg] Residential Driveways & Guest Parking Comment: : i :~: . .: >. : QUARRY CREEK R-3 Priority Development Project-SWMP Page 19 ·Applicable Be$tManagement Practice . ' . . . D Rural Swale System D Urban Curb/Swale System D Dual Drainage System D An alternate method, as approved by the City Engineer rg] Not Applicable .·· .; ·. ... : .. ,:\ .·: D Designed to drain into adjacent landscape prior to discharging to a storm water conveyance rg] Shared access D Flared or piano shaped entrance (single lane at street) D Wheel strips (paving only under tires) D Porous paving/Permeable surface D Not Applicable . . . :::· .. '· : .·'·•.. . • .. SB&O INC. 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) In~lividuat·:Ptiority Project Category · · '·· ·· · · D Dock Areas (Truck Wells) Comment: ': :· ;.·v: ;> '< •. •· .. . · .. ·. ·.· D Maintenance and Repair Bays Comment: . · ... ·:· .. ··.·· . • ... : :'. QUARRY CREEK R-3 Priority Development Project-SWMP Page 20 . . ···. Applicable In~plementation.Requireme11ts ' . . ,. . . ·. . D Covered loading dock areas or, D Designed to preclude urban run-on and runoff D Containment method to isolate dock and facilitate pollutant removal, such as a shut-off valve and containment area D Equipped with a clarifier or other pretreatment facility D An alternate method, as approved by the City Engineer D Acknowledgement that direct cmmections to storm drains from depressed loading docks are prohibited [gJ Not Applicable . '<····. .. ,· .. ··•.··········· ··•••··. • .•.. ··:·.· .. ·,.·.. :c ·> : . .· . D Located indoors and, D Designed to preclude urban run-on and runoff from adjacent areas D Self-contained bay drainage system (i.e. dead-end sump, with no outlet to offsite facilities) designed to capture all wash water, leaks, and spills. The self-contained clJrainage system shall connect to a "dead end sump" for collection and proper disposal D Acknowledgement that connection of maint(~nance and repair bay drains to the sanitary sewer or storm water conveyance system is prohibited. [gJ Not Applicable . . : .. : .>•.,:(:: .. :· .... · ·. SB&O INC. 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) .. lndivi<lual Priority .]>roject '~.' ": ' ' . " ' . ., ' Applica})le B<rst Management Practice Category·· ·• D Vehicle and Equipment Wash Areas Comment: . .... . . D Outdoor Processing Areas Comment: .. . .. ·.· ....•.... ... · .. .····.· ..... · .. ·.· < ... QUARRY CREEK R-3 Priority Development Project -SWMP Page 21 D Paved with an impervious surface D Self-contained to preclude urban run-on and runoff D Preferably located indoors or, D Covered with a roof or overhang D Equipped with a clarifier or other pretreatment facility D Properly connected to a sanitary sewer or, D An alternate method, as approved by the City Engineer D Acknowledgement that connection of vehicle and equipment wash areas to the storm water conveyance system is prohibited !SJ Not Applicable · .. · .. ·. . . . .. ·.·· . .. • . ·• .. .. D Cover or enclose areas of that are a source of pollutants, D Grade or berm the perimeter of the processing area to prevent run-on or runoff D Sloped to a self-contained drainage system (i.e. "dead-end sump", with no outlet to offsite facilities) designed to capture all wash water, leaks, and spills. The self-contained drainage system shall connect to a "dead end sump" for collection and proper disposal D Equipped with a clarifier or other pretreatment facility D Properly connected to a sanitary sewer or, D An alternate method, as approved by the City Engineer D Acknowledgement that installation of storm drain inlets in outdoor processing areas and connection to a storm water conveyance system is prohibited !SJ Not Applicable .. • . .. . ; .... · .·' . L ···•··· ·.• . .... SB&O INC. 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) lltdhidual Priority froject · ·cateaory · · ·· D Fueling Areas Comment: . .. .; . .Applicable Best M~magement f~a~Hce . ·.· D Paved with an impervious PCC surface D Graded at a minimum slope to prevent pond formation D Separated by grade break, curb, or berm to prevent nm-on D Covered with a canopy that extends a minimum of ten feet in each horizontal direction, for each pump, or alternatively; D Covered the fuel area with minimum dimensions equal to or greater than the area within the grade break or fueling area (defined as extending 6.5 feet from the comer of each fuel dispenser or the length at which each hose and nozzle assembly may be operated plus one foot, whichever is greater D The canopy shall not drain to the fueling area D Acknowledgement that connection of fueling areas to the sanitary sewer or storm water conveyance system is prohibited ~Not Applicable .··. . ....... · ... • .·. . .······ .• •·· .. ··•...•.. • ; /. . .••..• ><'• ;.• ••••·• ; ·•·. D Where landscaping is proposed in surface parking areas (both covered and uncovered), incorporate landscape areas into the drainage design D Retail and Surface Parking Areas D Overflow parking (i.e. parking in excess of the minimum parking requirements for the project) may be constructed of permeable paving Comment: QUARRY CREEK R-3 Priority Development Project -SWMP Page 22 ~ Not Applicable ··.·.· SB&O INC. 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) Individual Priority }'troject O~tegoey .·.: r;gj Steep Hillside Landscaping Comment: . · .... ·. :. · .. QUARRY CREEK R-3 Priority Development Project -SWMP Page 23 Ap:~Jlicable Best Management Practice r;gj Steep hillside areas disturbed by project development shall be landscaped with deep rooted, drought-tolerant plant species selected for erosion control and stabilized with mulch, consistent with the statewide Water Conservation in Landscape Act D Not Applicable .. . • .. · ..... . : .... :<.:•. ••••••••••• .. SB&O INC. 14.0 Implementation of Site Design Low Impact Development (LID) Practices :' ', ' / ' ' ,', ,, LID Practice Applicable Desigh Characteristics • cgj Preserve natural drainage features cgj Preserve existing trees and vegetation D Minimize soil disturbance cgj Clustering or concentrating development on the least cgj Conserve Natural Areas environmentally sensitive areas; consistent with SUSMP §4.1 (e.g. developing on ... previously graded areas, areas containing of non-native vegetation and etc.) cgj Incorporation of open space Lot( s) D An alternate method, as approved by the City Engineer D Not Applicable Comment: Done as part of the Quarry Creek Master Plan . . ···.. • • > ; { . : .• : .,:' t ·.:•,:··, .. <·,/ :· cgj Minimize Impervious Surfaces Comment: ····.' . : > ; : .·: .i• <' QUARRY CREEK R-3 Priority Development Project-SWMP Page 24 '·,· .· : ·'' ·······,: ..... , .. ; :: .· .: ; :.; ; .•.•. : .•• >.·.·· :. : .... :• ,.: : cgj Minimize the impervious footprint by increasing building density and/or by incorporating multiple-storied architecture cgj Construct streets, sidewalks, and parking lot drive aisles to minimum widths, provided public safety is not compromised cgj Incorporate landscape buffers between sidewalks, streets, and other flatwork cgj Minimize impervious surfaces in landscape design; such as decorative or stamped concrete DUsing permeable surfaces (porous concrete, pavers, asphalt) in overflow parking or low-traffic areas D An alternate method, as approved by the City Engineer D Not Applicable ..... : i . ; : : .· : .. : :· . : .. , .. . SB&O INC. 14.0 Implementation of Site Design Low Impact Development (LID) Practices (continued) ,,,>,,',', . LID Practice [g) Protect Slopes and Channels Comment: < ··.···.:··· .. .'·:··.:: :,·.. : .. · . / QUARRY CREEK R-3 Priority Development Project-SWMP Page 25 Applicable Design Chatacteri$dc [g) Minimize disturbance to natural drainages [g) Convey runoff safely from the tops of slopes 0 Vegetate slopes with native or drought tolerant landscape 0 Stabilize permanent channel crossings 0 Install Energy Dissipaters 0 An alternate method, as approved by the City Engineer 0 Not Applicable ' '· :, : .·: i :'. <::: ,'·: .. ·.. ,:,; ···.•. /. <.· , .. · : . ·.' SB&O INC. 15.0 Water Quality Treatment Calculations Area Impervious area Landscape Area DMAName SF AC SF AC SF AC R-3 287,420 6.598 155,305 3.565 132,115 3.033 01 6,342 0.146 0 0.000 6,342 0.146 BB 3-3 (offsite) 23,656 0.543 23,656 0.543 0 0.000 02 (offsite) 11,237 0.258 0 0.000 11,237 0.258 I Totals I 328,655 I 7.545 1178,961 1 4.1os 1149,694 I 3.437 I CwQ I 0.590 I 85th Percentile de_eth I?· 65 mch I WQVol 110,505 CF I o.241 AF I Provided Area 18,896 SF I Reguired Area 17,757 SF Computed% Sizing Area 4.587 Notes: 1} Cwt:~=Composite runoff factor per Section 4 of SUSMP=(impervious area"1 +0.1 *pervious, area)/total area 2} WQ Voi=WQ 85th Percentile depth'" Cwo *Area 3) Computed% sizing factor= Provided Basin Bottom Area with Sandy Loam (SF} I {Cwo *Area)" 100 QUARRY CREEK R-3 Priority Development Project-SWMP Page 26 SB&O INC. 16.0 Comparison of Water Quality Treatment Calculations Basin 3-3 Master Report Design Assumptions Area (AC) Impervious Area (AC) CWQ WQ Vol (AF) Provided Area (SF) Computed % Sizing Area QUARRY CREEK R-3 Priority Development Project-SWMP Page 27 7.5 4.81 0.68 0.28 8896 4 SB&O Calculations 7.55 4.108 0.590 0.241 - 4.587 % Difference 101% 85% 87% 86% - 115% SB&O INC. 17.0 Relative Effectiveness of Project Treatment Facilities Treatment Facility/IMP l:8J Bioretention IMP D Flow Through Planter IMP D fufiltration IMP D Conventional Vegetated Swale D Extended (Dry) Detention Basins D Media (Sand) Filter D Wet Pond D Constructed Wetland D Proprietary Vault/Tree Well D Proprietary fulet Filter QUARRY CREEK R-3 Priority Development Project -SWMP Page 28 Coarse Sediment Fine Particles During and Trash Trans ort High High High High High High High Medium High High High High High High High High High Medium High Low Pollutants that tend to be Dissolved Following Treatment Medium Medium High Low Low Low Medium Medium Low Low SB&O INC. 18.0 Summary and Conclusion Narrative This SWMP has identified this project as a Priority category that is required to implement Low Impact Development, Treatment Control, and hydromodification mitigation measures. The potential pollutants to be generated from this project have been identified and compared to the impairments of all downstream bodies of water leading to the Pacific Ocean. In order to mitigate for these potential pollutants, the R-3 area will discharge to bioretention basin 3-3 as defined and described in the regional SWMP. Basin 3-3 will also mitigate for potential hydromodification impacts to downstream receiving waters. This project is within and consistent with the assumptions used for the design ofthe applicable Integrated Management Practices set forth in the regional SWMP for the R-3 area. QUARRY CREEK R-3 Priority Development Project-SWMP Page 29 SB&O INC. 19.0 Figures Vicinity Map Proposed DMA Exhibit (map pocket) QUARRY CREEK R-3 Priority Development Project-SWMP Page 30 SB&O INC. £L CAMINO COUNTRY CLUB VICINITY MAP NOT TO SCALE THOMAS BROTHERS PG. 1107, BR!f) A-2 2008 £OmON 20.0 Attachments City of Carlsbad Storm Water Standards Questionnaire Geotechnical Study reference Permanent BMP Certification Form (see Project Design Consultants [PDC] regional report) HMP Calculations (see PDC regional report) QUARRY CREEK R-3 Priority Development Project-SWMP Page 31 SB&O INC. STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov 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 (BMP's) into the project design per the City's Standard Urban Stormwater Management Plan (SUSMP). To view the SUSMP, refer to the Engineering Standards (Volume 4, Chapter 2). Initially 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 Stormwater Requirements' or be subject to additional criteria called 'Priority Development Project Requirements'. Many aspects of project site design are dependent upon the storm water standards applied to a project. 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 mon3 of the questions, please seek assistance from Land Development Engineering staff. A separate completed and signed questionnaire must be submitted for each new development application submission. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. In addition to this questionnaire, you must also complete, sign and submit a Project Threat Assessment Form with construction permits for the project. Please start by completing Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. ·"· i:s.L;•· ·'' .,.,{.~ffl:;i"'i~~·~I,c;{;;;~~-iffj;_~.r,~e,1,:f>;,;}'~""',f:f":{;~:;~;\~·~:::t:r: :•BE''CQfv'I~Lf:TED.FOR.AJ:.EPRO,JE~TS To determine if your project is a priority development project, please answer the following questions: 1. Is your project LIMITED TO constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: (1) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non-erodible permeable areas; OR (2) designed and constructed to be hydraulically disconnected from paved streets or roads; OR (3) designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets uidance? 2. Is your project LIMITED TO retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in accordance with the US EPA Green Streets guidance? YES NO X X If you answered "yes" to one or more of the above questions, then your project is NOT a priority development project and therefore is NOT subject to the storm water criteria required for priority development projects. Go to step 4, mark the last box stating "my project does not meet PDP requirements" and complete applicant information. If you answered "no" to both questions, then go to Step 2. E-34 Page 1 of 3 Effective 6/27113 City of Ga1~l ""ad STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov To determine if your project is a priority development project, please answer the following questions: 1. Is your project a new development that creates 10,000 square feet or more of impervious surfaces coiiHctively over the entire project site? This includes commercial, industrial, residential, mixed-use, and public develo ment ro ·ects on ublic or rivate land. 2. Is your project creating 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 more of impervious surface? This incfudes commercia{, industrial, residentiaf, mixed-use, and ubfic devefo ment projects on ublic or rivate land. 3. 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 restaurant? A restaurant is a facility that sells pr,epared foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate consumption. 4. 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 developmemt project includes development on any natural slope that is twenty-five percent or greater. 5. 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 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. 6. 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 street, road, highway freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles, trucks, motorc cles, and other vehicles. 7. Is your project a new or redevelopment project that creates 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 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 ro·ect to the ESA i.e. not commin les with flows from ad·acent lands.* 8. Is your project a new development that supports an automotive repair shop? An automotive repair shop is a facility that is categorized in any one of the fol/owing Standard Industrial Classification (SIC} codes: 5013, 5014, 5541, 7532-7534, or 7536-7539. 9. Is your project a new development that supports a retail gasoline outlet (RGO)? This category includes 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 da . 1 O.ls your project a new or redevelopment project that results in the disturbance of one or more acres of land and are expected to generate pollutants post construction? 11.1s 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%? YES X X X NO X X X X X X X X If you answered "yes" to one or more of the above questions, you ARE a priority development project and are therefore subject to implementing structural Best Management Practices (BMP's) in addition to implementing Standard Storm Water Requirements such as source control and low impact development BMP's. A Storm Water Management Plan (SWMP) must be submitted with your application(s) for development. Go to step 3 for redevelopment projects. For new projects, go to stElp 4 at the end of this questionnaire, check the "my project meets PDP requirements" box and complete applicant information. If you answered "no" to all of the above questions, you ARE NOT a priority development project and are therefore subject to implementing only Standard Storm Water Requirements such as source control and low impact development BMP's required for all development projects. A Storm Water Management Plan (SWMP) is not required with your application(s) for development. Go to step 4 at the end of this questionnaire, check the "my project does not meet PDP requirements" box and complete applicant 'nformation. E-34 Page 2 of 3 Effective 6/27113 . . . . Cityof rarlsl)ad STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than 50% of the surface area of the reviousl existin develo ment? If you answered "yes," the structural BMP's required for Priority Development Projects apply only to the creation or replacement of impervious surface and not the entire development. Go to step 4, check the "my project meets PDP requirements" box and complete applicant information. If you answered "no," the structural BMP's required for Priority Development Projects apply to the entire development. Go to step 4, check the "my project meets PDP requirements" box and complete applicant information. · .. ~!:~:~.--;~<~-:/ -~\;.; ~' ·· ;.:::iHEC·K~H~-APP~6PRI~~EBOXA~J~o~;~~i~-~~LICAN;tNFO~~~~~r-t;,' __ ,.~~': '· :_:·:::~ ~','<' ~. ; ' ' •. >~-' ~ .. •c '1~,·: •' \ ~ My project meets PRIORITY DEVELOPMENT PROJECT (PDP) requirements and must comply with additional stormwater criteria per the SUSMP and I understand I must prepare a Storm Water Management Plan for submittal at time of application. I understand flow control (hydromodification) requirements may apply to my project. Refer to SUSMP for details. 0 My project does not meet PDP requirements and must only comply with STANDARD STORMWATER REQUIREMENTS per the SUSMP. As part of these requirements, I will incorporate low impact development strategies throughout my project. Applicant Information and Signature Box Address: End of existing Marron Road. Accessor's Parcel Number(s): 167-040-11,-21 Applicant Name: Cornerstone Communities Applican~le: . J. f;ued~fl+ ~-ve. LOJ'\L el~t~ Applicant Sign~ r: Date: 1 . l '-f . I 5 I --{ f-) \ This Box for City Use Only '. I I C1ty Concurrence. NO By: Date: Project ID: * Environmentally Sensitive Areas 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 Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their quivalent under the Multi Species Conservation Program within the Cities and County of San Diego; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees. E-34 Page 3 of 3 Effective 6/27/13 ·l