The URL can be used to link to this page

Home My WebLink AboutCT 08-03; LA COSTA TOWN SQUARE RESIDENTIAL; STORM WATER MANAGEMENT PLAN; 2012-09-19STORM WATER MANAGEMENT PLAN FOR LA COSTA TOWN SQUARE RESIDENTIAL CT. 08-03 March 2005 Revised!: March 2007 Revised: April 2008 Revised: October2008 Revised: January 2009 Revised: January 2012 Prepared For: Property Development Centers 5918 Stoneridge Mall Road Pleasanton, CA 94588 Phone: (925) 738-1207 Prepared By: O'DAY CONSULTANTS, INC. 2710 Loker Avenue West, Suite 100 Carlsbad, CA 92010 RECORD C6PY~1 J.N. 101290 La Costa Town Square Residential SWMP TABLE OF CONTENTS TABLE OF CONTENTS i 1. PROJECT SETTING 1 2. APPLICABLE STORMWATER STANDARDS 3 2a. Storm Water Standards Questionnaire 3 2b. HMP Applicability Determination 3 3. IDENTIFY POLLUTANTS OF CONCERN 4 3a. Identify pollutants associated with type of project/use 4 3b. Identify watershed, hydrologic unit basin and receiving waters 4 3c. List impaired water bodies 5 3d. Beneficial uses of receiving water 5 3e. Summarize primary pollutants of concern 7 4. SOURCE CONTROL MEASURES 8 4a. Description of site activities and potential sources of pollutants 8 4b. Stormwater Pollutant Sources and Source Controls 8 5. LOW IMPACT DEVELOPMENT (LID) DESIGN STRATEGIES 10 5a. Low Impact Development Design Strategies 10 5b. Future Low Impact Development Design Strategies 10 6. INTEGRATED MANAGEMENT PRACTICES (IMP's) 1 6a. Selection process for IMP's 1 6b. Sizing factors for IMP'S 1 6c. Geotechnical recommendation on soil infiltration rates 1 6d. Infiltration calculations 1 7. TREATMENT CONTROL BMP's 12 8. HYDROMODIFICATION 13 8a. Lower Flow Threshold Determination 13 8b. Continuous Simulation Model 14 8c. Print-outs of Pond Sizing Criteria and Results Using BMP Sizing Calculator 14 8d. Tabulation of Flow-control Facility Sizes and Design Criteria 14 9. DOCUMENTATION OF STORMWATER DESIGN 15 9a. Hydrology maps 15 9b. BMP Sizing Calculator 15 9c. Tabulation 15 10. BMP FACILITY MAINTENANCE REQUIREMENTS 16 10a. Ownership and responsibility of maintenance of BMP's 16 10b. Summary of maintenance requirements 16 11. SWMP CERTIFICATION STATEMENTS 17 La Costa Town Square Residential SWMP ATTACHMENTS: 1. storm Water Standards Questionnaire 2. Single Sheet Post-Construction BMP Exhibit 3. DMA/IMP Sizing Exhibit 4. BMP Calculator Output l:\001017\_Residential\Stormwaeer\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 1. PROJECT SETTING The La Costa Town Square Residential project is located South and east of Rancho Santa Fe Road and North of La Costa Avenue in the City of Carlsbad, California (see Vicinity Map below). The La Costa Town Square Residential site is part of a master planned development consisting of residential, office, and commercial uses. The entire site is approximately 74 acres with about 8 acres located north of Rancho Santa Fe Road. The residential component will comprise a total of 68 lots with 63 lots for single family units and 5 lots as open space over 24.4 acres. % \ CITY OF OCEANSIDE CITY OF SAN MARCOS PACIFIC OCEAN CITY OF ENCINITAS VICINITY MAP NO SCALE SITE I:\001017\_Residential\Stormwater\SWMP\LCTS SWMP-ResidentiaL.doc La Costa Town Square Residential SWMP The site is generally described as mostly undisturbed vacant land with the exception of small borrow and stockpile sites for the grading and improvements of Rancho Santa Fe Road and La Costa Avenue per City of Carisbad drawing 409-4B. The disturbed areas have since revegetated. The site is steep with well- defined drainage courses and generally slopes toward the south with slopes ranging from 10% along the northern portion to 18% southerly. There are several drainage courses with steep side slopes greater than 40%. The area north of Rancho Santa Fe Road is a previously graded flat pad. The USDA Natural Resources Conservation Service (NRCS) Web Soil Survey identifies San Miguel- Exchequer rocky silt loams as the predominant soil type, which represents Hydrologic Soil Group D. The percentage breakdown is as follows: Hydrologic Soil Group— Summary by Map Unit — San Diego County Area, Califomia (CA638) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI AtE Altamont clay, 15 to 30 percent slopes D 6.6 8.5% HrC2 Huertiuero loam, 5 to 9 percent slopes, eroded D 6.5 8.5% HrD2 Huertiuero loam, 9 to 15 percent slopes, eroded D 23.2 30.2% SbC Salinas clay loam, 2 to 9 percent slopes B 0.4 0.5% SnG San Miguel-Exchequer rocky silt loams, 9 to 70 percent slopes D 40.2 52.3% Totals for Area of Interest 76.9 100.0% Hydrologic Soils Group D soils have a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. The proposed land use is single family residential. There are 63 residential lots with the remaining 5 lots comprising open space and water quality treatment facilities. Within a typical residential subdivision, anticipated activities that could affect storm water include landscape and gardening, pet ownership, swimming pool and spa cleaning and maintenance, pest control, household hazardous material use^ storage and disposal, and composting. Stormwater control and treatment constraints include poor soil type and permeability (soil type D), high intensity land use, steep terrain, restricted right-of-way, and safety concerns in a residential development. Opportunities include unbuildable parcels and parcels set aside for specifically treatment facilities, landscape buffer areas, open space set aside for water features, and elevation differences. There are three locations where runoff from Rancho Santa Fe Road discharges to the site as indicated on City of Carisbad Rancho Santa Fe Road improvement plans Drawing No. 368-2, sheet 42 and Drawing No. 368-2C, sheets 14 and 15. All site drainage runs south where it enters the City of Carisbad's MS4 at three separate locations along La Costa Avenue. Drainage from the site then combines with flows from various portions of The Village of La Costa, and The Oaks and flow into a detention basin built with The Oaks project. Controlled discharge from the basin eventually discharges to Encinitas Creek, which ultimately flows into Batiquitos Lagoon and finally the Pacific Ocean l:\00l017V.Residential\Slormwater\SWMP\LCrS SWMP-ResidentiaL.doc La Costa Town Square Residential SWMP APPLICABLE STORMWATER STANDARDS 2a. Storm Water Standards Questionnaire Results of the completed City of Carlsbad Storm Water Standards Questionnaire (SWSQ) indicate this project to be a Priority Development Project (PDP) and therefore must comply with additional stormwater criteria per the SUSMP. (See Attachment 1 for completed SWSQ) 2b. HMP Applicability Determination According to Figure 2-1, HMP Applicability determination flowchart below, Hydromodification controls are required. It was determined that field investigations would not be conducted pursuant to the SCCWRP channel screening tools. Therefore the site must mitigate peak flows and durations based on a pre-project condition lower flow threshold of 0.1Q2. 14 Hyiircnadif;c3ton Cortrols Requirsd Go lo F-gyre G-2 ot Oecsion Mab-Ji FIGURE 2-1. HMP Applicability Determination 3 I:\001017\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 3. IDENTIFY POLLUTANTS OF CONCERN 3a. Identify pollutants associated with type of project/use Table 2-1 of the SUSMP (see below) identifies the pollutants anticipated from the La Costa Town Square Residential Development and associated improvements as indicated by the shaded categories. TABLE 2-1. ANTICIPATED AND POTENTIAL Pollutants Generated by Land Use Type, (jcneral Pollutant Categories Pnority Project Catesories Sediment Nutrients 1Icavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil& Grease Bacteria & Viruses Pesticides Detached Kesideiitial Development X X X X X X X Attached Kesideiitial Development X X X P(l) P(2) P X Commercial Development >oiie acre P(1) P(l) X P(2) X P(5) X P(3) P(5) Heavy Industry X X X X X X Automotive Kepair Shops X X(4)(5) X X Restaurants X X X X PH) 1 lillaidc Development > 5,000 ft2 X X X X X X Parking Lots P(l) P(l) X X P(l) X P(l) Retail Ciasolinc Outlets X X X X X Streets. I lighways & I'rccwavs X P(I) X X(4J X P(5) X X P(l) X = anticipated 1' = potential (1) A potential pollutant if landscaping exists on-site. (2) A potential pollutant if the project includes uncovered parking areas. (3) A potential pollutant if land use involves food or animal waste products. (4) Including petroleum hydrocarbons. (5) Including solvents. 3b. Identify watershed, hydrologic unit basin and receiving waters The project is located in the Batiquitos Lagoon Hydrologic Subarea (904.51) of the Carlsbad Hydrologic Unit in the San Diego Region As described in Section 1 above, site runoff enters the City's MS4 along La Costa Avenue and combines with flows from surrounding developments before discharging to a regional detention facility. Mitigated flows then enter an unnamed conveyance system which enters Encinitas Creek approximately 1.9 miles downstream. It then enters Batiquitos Lagoon about 1.6 miles further. I:\OOI017\_Residemial\Slormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 3c. List impaired water bodies According to the California 2006 303(d) list of Water Quality limited Segments published by the RWQCB, there are currently no TMDLs established for Batiquitos Lagoon or Carisbad. Encinitas Creek however is listed as Impaired with phosphorus with an estimated size affected of 3 miles. The source is unknown and it is unclear what reach of the creek is affected. 3d. Beneficial uses of receiving water The beneficial uses for the hydrologic unit are indicated in Table 2-2 and 2-3 and described in detail below. This information comes from the Water Quality Control Plan for the San Diego Basin. Table 2-2. BENEFICIAL USES OF INLAND SURFACE WATERS BENEFICIAL USE In land Surface Waters Hydrologic Unit Basin Number M U N A G R 1 N D P R 0 c G W R F R s H P 0 W R E c 1 R E c 2 B 1 0 L W A R M c 0 L D W 1 L D R A R E s P W N San Marcos Creek Watershed Batiquitos Lagoon 4.51 See Coast Water -Table 2-3 San Marcos Creek 4.52 + • • • • • unnamed intermittent streams 4.53 + • • • • • San Marcos Creek 4.51 + • • • • • Encinitas Creek 4.51 + • • • • • + Excepted from MUN • Existing Beneficial Use Waterbodies are listed multiple times if they cross hydrologic area or sub area boundaries. ' Beneficial use designations apply to all tributaries to the indicated waterbody, if not listed separately. Table 2-3. BENEFICIAL USES OF COASTAL WATERS BENEFICIAL USE Hydrologic 1 N R R c B E W R M A M S W S H Coastal Waters Unit Basin N A E E 0 1 s 1 A A Q 1 P A E Number D V c c M 0 T L R R U G w R L 1 2 M L D E A R N M L Batiquitos Lagoon • • • • • • • • • Beneficial Uses of Inland Surface Waters MUN - Municipal and Domestic Supply: Includes uses of water for community, military, or individual water supply systems including, but not limited to, drinking water supply. AGR - Aquaculture: Includes the uses of water for aquaculture or mariculture operations including, but not limited to, propagation, cultivation, maintenance, or harvesting of aquatic plants and animals for human consumption or bait purposes. REC 1 -Contact Recreation: Includes uses of water for recreational activities involving body contact with water, where ingestion of water is reasonably possible. These uses include, but are not limited to, swimming, wading, water-skiing, skin and SCUBA diving, surfing, white water activities, fishing, or use of natural hot springs. REC 2 -Non-Contact Recreation: Includes the uses of water for recreational activities involving proximity to water, but not normally involving body contact with water, where ingestion of water is reasonably possible. These include, but are not limited to, picnicking, sunbathing, hiking, beachcombing, camping, l;\001017\_ResidentiaI\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP boating, tide pool and marine life study, hunting, sightseeing, or aesthetic enjoyment in conjunction with the above activities. WARM - Warm Freshwater Habitat: Includes uses of water that support warm water ecosystems including, but not limited to, preservation or enhancement of aquatic habitats, vegetation, fish, or wildlife, including invertebrates. WILD -Wildlife Habitat: Includes uses of water that support terrestrial ecosystems including but not limited to, preservation and enhancement of terrestrial habitats, vegetation, wildlife, (e.g., mammals, birds, reptiles, amphibians, invertebrates), or wildlife water food and sources. Beneficial Uses of Coastal Waters REC 1 - See Beneficial Uses of Inland Surface Waters above REC 2 - See Beneficial Uses of Inland Surface Waters above BIOL - Preservation of Biological Habitats of Special Significance: Includes uses of water that support designated areas or habitats, such as established refuges, parks, sanctuaries, ecological reserves, or Areas of Special Biological Significance (ASBS), where the preservation or enhancement of natural resources requires special protection. EST - Estuarine Habitat: Includes the uses of water that support estuarine ecosystems including, but not limited to, preservation or enhancement of estuarine habitats, vegetation, fish, or wildlife (e.g., estuarine mammals, waterfowl, shorebirds). WILD - See Beneficial Uses of Inland Surface Waters above RARE - Rare, Threatened, or Endangered Species: Includes uses of water that support habitats necessary, at least in part, for the survival and successful maintenance of plant or animal species established under state or federal law as rare, threatened or endangered. MAR -Marine Habitat: Includes uses of water that support marine ecosystems including, but not limited to, preservation or enhancement or marine habitats, vegetation such as kelp, fish, shellfish, or wildlife (e.g., marine mammals, shorebirds). MIGR -Migration of Aquatic Organisms: Includes uses of water that support habitats necessary for migration, acclimatization between fresh and salt water, or other temporary activities by aquatic organisms, such as anadromous fish. SPWN - Spawning, Reproduction, and/or Early Development: Includes uses of water that support high quality aquatic habitats suitable for reproduction and early development offish. This use is applicable only for the protection of anadromous fish. 6 L\0010I7\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 3e. Summarize primary pollutants of concern The primary pollutants of concern for this project are Sediment, Nutrients, Heavy Metals, Organic Compounds, Trash 8i Debris, Oxygen Demanding Substances, Oil & Grease, Bacteria & Viruses, and Pesticides. The extensive use of bioretention treatment control facilities throughout the site should be a highly effective method of treating Coarse Sediment and Trash, and Pollutants that tend to associate with fine particles during treatment. Bioretention facilities also show medium effectiveness for treatment of Pollutants that tend to be dissolved following treatment. l:\001017\_Residential\Stormwater\SWMP\LCTS SWMP-ResidentiaL.doc La Costa Town Square Residential SWMP 4. SOURCE CONTROL MEASURES 4a. Description of site activities and potential sources of pollutants Activities and potential pollutant sources associated with this site include: • On-site storm drain inlets • Landscape and outdoor pesticide use • Pools, spas, ponds, decorative fountains, and other water features. • Miscellaneous Drain or Wash Water consisting of roofing, gutters, and trim. 4b. Stormwater Pollutant Sources and Source Controls The following table identifies permanent and operational source control measures for the project site as outlined in Appendix 1, Stormwater Pollutant Sources and Source Control checklist in the City's SUSMP: Potential Source of Runoff Pollutants Permanent Source Control BMPs Operational Source Control BMPs On-site storm drain inlets Mark all inlets with the words "No Dumping! Flows to Bay" or similar. • Maintain and periodically repaint or replace inlet markings. • Provide stormwater pollution prevention information to new site owners, lessees, or operators. • See applicable operational BMPs In Fact Sheet SC-44, "Drainage System Maintenance," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com • Include the following in lease agreements: "Tenant shall not allow anyone to discharge anything to storm drains or to store or deposit materials so as to create a potential discharge to storm drains." Landscape and outdoor pesticide use Final landscape plans will accomplish all of the following: • Preserve existing native trees, shrubs, and ground cover to the maximum extent possible. • 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 stormwater pollution. • Where landscaped areas are used to retain or detain stormwater, specify plants that are tolerant of saturated soil conditions. • Consider using pest-resistant plants, especially adjacent to hardscape. • Maintain landscaping using minimum or no pesticides. • See applicable operational BMPs in Fact Sheet SC-41, "Building and Grounds Maintenance," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com • Provide IPM information to new owners, lessees and operators. 8 L\001017\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP • To insure successful establishment, select plants appropriate to site soils, slopes, climate, sun, wind, rain, land use, air movement, ecological consistency, and plant interactions. Roofing, gutters, and trim Avoid roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff. L\001017\_Residential\Stormwater\SWMP\LCTS SWMP-ResidentiaL.doc La Costa Town Square Residential SWMP 5. LOW IMPACT DEVELOPMENT (LID) DESIGN STRATEGIES 5a. Low Impact Development Design Strategies The UD strategies applicable to this residential development project include dispersing runoff to adjacent pervious surfaces and draining to Integrated Management Practices (IMPs). Bioretention facilities were considered for IMPs and sized as ponds to treat runoff and provide hydromodification flow control from the residential development including streets, sidewalks, and house footprints. Bioretention facilities are also incorporated as a drainage design element. Individual lots will disperse runoff from impervious surfaces to landscaped areas. Landscape plans developed for the precise grading will incorporate landscaping to meet this objective. For the area adjacent to Rancho Santa Fe Road, Drainage Area 6 on the BMP Exhibit, there are 5 locations where runoff from the road will flow through vegetated swales prior to flowing into a "mitigation" swale, as required by the permitting agencies. Although treatment of runoff from Rancho Santa Fe Road is not required as part of this project, the opportunity for treatment is available and will be utilized. For Drainage Area 5, all the runoff is toward the existing development to the east and there is no opportunity for treatment of the street. The two lots within this drainage area will include bioretention areas or other LID techniques. 5b. Future Low Impact Development Design Strategies Consider the following future LID design strategies for the site plan or precise grading plan of residential lots: • Roof drains should be designed to drain over turf or landscape areas prior to discharge from the lot. • Use drought-tolerant species that do not require excessive irrigation in accordance with the city Landscape Manual when possible. • Design irrigation systems to reduce over-irrigation, employ rain shutoff devices preventing irrigation after rainfall events. • Prior to discharge, runoff from impervious surfaces should, to the maximum extent practicable, discharge over landscaped/planter areas or pervious surfaces discharge from the lot. Driveways, walkways, parking areas, and patios should be designed to drain over turf or landscape areas prior to discharge from each lot. 10 L\001017\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 6. INTEGRATED MANAGEMENT PRACTICES (IMP's) 6a. Selection process for IMP's According to Table 2-2 of the SUSMP, The majority of pollutants of concern for this project can be grouped in the category of Pollutants that tend to associate with fine particles during treatment. Nutrients also fall under the category of Pollutants that tend to be dissolved following treatment and Trash & Debris falls under the category of Coarse Sediment and Trash. According to Table 2-3, Infiltration Facilities provide the highest effectiveness for removal of pollutants in all three categories but our site is constrained by impermeable soils (soil type "D"). Bioretention Facilities were chosen extensively throughout the site for their high removal rates of Coarse Sediment and Trash and Pollutants that tend to associate with fine particles during treatment and their medium removal rates for Pollutants that tend to be dissolved following treatment. Bioretention facilities detain stormwater and filter it slowly through engineered soil or sand and are versatile in that they can be any shape and can be landscaped. The bioretention areas onsite were sized as ponds to treat stormwater as well as limit flow using control through hydromodification. 6b. Sizing factors for IMP's 1) Lower flow threshold determination Field investigations were not conducted pursuant to SCCWRP screening tools. Therefore, according to Figure 2-2 of the City's SUSMP, the site must mitigate peak flows and durations based on a pre-project condition lower flow threshold of 0.1Q2. 2) HMP Decision Matrix IMP facilities were sized using the Decision Matrices in Figures 2-2 in Section 8, Hydromodification, below. 6c. Geotechnical recommendation on soil infiltration rates IMP facilities were chosen that do not drain through native soil, as soil infiltration rates were anticipated to be low. 6d. Infiltration calculations Self-retaining areas were not utilized on this site, as soil infiltration rates were anticipated to be low. 11 I:\001017V.Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 7. TREATMENT CONTROL BMP's Bioretention areas were sized for both treatment and hydromodification. Refer to Section 6, Integrated Management Practices, and Section 8, Hydromodification, for IMP and hydromodification discussion. 12 I:\001017\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 8. HYDROMODIFICATION 8a. Lower Flow Threshold Determination Field investigations were not conducted pursuant to SCCWRP screening tools. Therefore, according to Figure 2-2 below, the site must mitigate peak flows and durations based on a pre- project condition lower flow threshold of 0.1Q2. Consult v^lh Geotechnical Engineer NO 4. Size LID andgMP FaciliUes for omi Flow Range 010.102 to 0,0? Redesign LID or BMP End of^cision Matrix FIGURE 2-2. Mitigation Criteria and Implementation 13 L\001017\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaLdoc La Costa Town Square Residential SWMP 8b. Continuous Simulation Model A Site Specific continuous simulation model was not considered for this project 8c. Print-outs of Pond Sizing Criteria and Results Using BMP Sizing Calculator Attachment 4 includes printout of sizing criteria and results for each of four bioretention facilities proposed for this site. The "Pond" sizing calculator was utilized to size each basin. 8d. Tabulation of Flow-control Facility Sizes and Design Criteria See attachment 4 14 I:\OOI017\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaLdoc La Costa Town Square Residential SWMP DOCUMENTATION OF STORMWATER DESIGN 9a. Hydrology maps Attachment 3 depicts tributary areas to each IMP, or Bioretention facility and displays DMA's by surface type. 9b. BMP Sizing Calculator Output from the BMP Sizing Calculator is included in Attachment 4. 9c. Tabulation Attachment 3 tabulates DMA areas draining to each IMP for the four Project Site Drainage Areas. Attachment 4 includes printouts from the BMP Sizing Calculator that also tabulates each DMA and includes IMP sizes, volumes, and orifice sizes for each of the four bioretention IMPs within the Project Site. 15 I.\001017\_Residential\Stormwater\SWMP\L(rrS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 10. BMP FACILITY MAINTENANCE REQUIREMENTS 10a. Ownership and responsibility of maintenance of BMP's The Owner and Developer will be responsible for the maintenance of treatment facilities. Ongoing maintenance will be assured by executing a Permanent Stormwater Quality BMP Maintenance Agreement that "runs with the land." 10b. Summary of maintenance requirements Bioretention facilities remove pollutants primarily by filtering runoff slowly through aerobic, biologically active soil. Routine maintenance is needed to ensure that flow is unobstructed, that erosion is prevented, and that soils are held together by plant roots and are biologically active. Typical maintenance consists of the following: • Inspect inlets for channels, exposure of soils, or other evidence of erosion. Clear any obstructions and remove any accumulation of sediment. Examine rock or other material used as a splash pad and replenish if necessary. • Inspect outlets for erosion or plugging. • Inspect side slopes for evidence of instability or erosion and correct as necessary. • Observe the surface of bioretention facility soil for uniform percolation throughout. If portions of the bioretention facility do not drain within 24 hours after the end of a storm, the soil should be tilled and replanted. Remove any debris or accumulations of sediment. Confirm that check dams and flow spreaders are in place and level and that rivulets and channelization are effectively prevented. Examine the vegetation to ensure that it is healthy and dense enough to provide filtering and to protect soils from erosion. Replenish mulch as necessary, remove fallen leaves and debris, prune large shrubs or trees, and mow turf areas. When mowing, remove no more than 1/3 height of grasses. Confirm that irrigation is adequate and not excessive and that sprays do not directly enter overflow grates. Replace dead plants and remove noxious and invasive vegetation. Abate any potential vectors by filling holes in the ground in and around the bioretention facility and by insuring that there are no areas where water stands longer than 48 hours following a storm. If mosquito larvae are present and persistent, contact the San Diego County Vector Control Program for information and advice. Mosquito larvicides should be applied only when absolutely necessary and then only by a licensed individual or contractor. 16 I:\001017\_Residential\Stormwater\SWMP\LCTS SWMP - ResidentiaL.doc La Costa Town Square Residential SWMP 11. SWMP CERTIFICATION STATEMENTS 11a. Preparer's statement The selection, sizing, and preliminary design of stormwater treatment and other control measures in this plan meet the requirements of Regional Quality Control Board Order R9-2007-0001 and subsequent amendments. NAME-TTAA O^f lib. Owner's statement f2^ DATE The selection, sizing, and preliminary design of stormwater treatment and other control measures in this plan meet the requirements of Regional Quality Control Board Order R9-2007-0001 and subsequent amendments. WNkl. Jr^n Reuter, Vice President of Development V DATE 17 l:\001017LResidenti8l\Sionnwaier\SWMP\LCTS SWMP - ResidentiaLdoc ATTACHMENT 1 stormwater Standards Questionnaire ^ CITY OF CARLSBAD STORM WATER COMPLIANCE FORM- TIER 3 CONSTRUCTION SWPPP E-31 Development Services Land Development Engineering 1635 Faraday Avenue 76(M02-2750 www.carlsbadca.gov I am appWng to the City of Carisbad fw the fbltowfng type of constructten pemiH(s): li/Grading Permit • Building Pemill • Right-of-Way Permit My proiect requbw preparation and approval of a Tier 3 Conslmctton Stonn Water Pollution Prevention Ran (SWPPP) because my project meets one or more of the foltowing criteria demonstraflng that the prwect potentially DOS« a significant threat to stomi water quality: My project Includes dearing, grading or other disturbances to the ground resulting In soH disturbance totalfno one or more acres Including any assodaisd construclion staging, equipment storage, stodtpiling. pavement removal refuefing and maintenance areas; or, ' My project is part of a phased development plan that wlB cumulaf vely result In soil dlsturtjance totaling one or more acres including any associated constniction staging, equipment storage, stockpiUng. pawment removal retueilna and malntanarKe areas; or. " • My prtyect is kxafed Inside or within 200 feet of an environmentally sensH^e area and has a significant potentJal ftjr contributing pdlutants to neart)y receiving waters byway of stonn water mnoff or non-«torm water dlscharBe(s). I CERTIFY TO THE BEST OF MY KNOWLEDGE THAT THE ABOVE CHECKED STATEMENTS ARE TRUE AND COf%RECT. I AM SUBMITTING FOR CrTY APPROVAL A TIER 3 CONSTRUCTION SWPPP PREPARED IN ACCORDANCE WITH cmr STANDARDS AND THE REQUIREMENTS OF THE STATE WATHR RESOURCES CONTROL TO/SDGSIERAL PERMIT FOR CONSTRUCTION ACTIVITIES - WATER QUALITY ORDER NO 99-0843WQ OR ORDER NO ^wSos - DWQ AFTER JULY 1. 2010, (GENERAL CONSTRUCTION PERMIT) AND ANY AMENDMENT RBflSlbNORR& ISSUANCE THEREOF. ' *^ I UNDERSTAND AND ACKNOWI^DGE THAT I MUST SUBMIT THE CITY APPROVED TIER 3 CONSTRUCTION SWPPP TO THE SAN DiEGO REGIONAL WATER QUALITY CONTROL BOARD TOGETHER WfTH A NOTICE OF INTENTION (NOl). AN APPROPRIATE FILING FEE AND OTHER REQUIRED DOCUMENTATION AND RECSVE A STATE WASTE DISCHARGER'S IDENTIFICATION (WDID) NUMBER PRIOR TO CfTY ISSUANCE OF THIABOVE REQUESTED CONSTRUCTION PERMIT(S). ine/wvt I ALSO UNDERSTAND AND ACKNOWLEDGE THAT I MUST ADHERE TO. AND AT Aa TIMES COMPLY WITH THP CITY APPROVED TIER 3 CONSTRUCTION SWPPP THROUGHOUT THE DURATION OF THE CONSTRUCT ON ACTIVITIES UNTIL THE CONSTRUCTION WORK IS COMPLETE AND APPROVED BY THE CITY OF CAI^BAD. Applicant Informallon and Signature Box This Box for Cify Use Only Address: Rancho Sart4-n.fe. '^/-A Coi'lzL A^z-f- Assessor's Parcel Nuni»ber{s): 5iX^ - US0-70 Applicant Name: Applicant Title: Applicant Signature:' ^ Date: " city Cortcurrence: By; No Date; Proiect ID; E-31 Pagel of1 REV4/3(V10 CITY OF CARLSBAD CONSTRUCTION THREAT ASSESSMENT WORKSHEET FOR DETERMINATION OF PROJECT'S PERCEIVED THREAT TO STORM WATER QUALITY E-33 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbaclca.gov Construction SWPPP Tier Level Construction Threat Assessment Criteria* Perceived Threat to Storm Water Quality Tier 3 Tier 3 - Hlqh Construction Threat Assessment Criteria High Tier 3 • Project site is 50 acres or more and grading will occur during the rainy season • Project site is 1 acre or more in size and is located within the Buena Vista or Agua Hedionda Lagoon watershed, inside or within 200 feet of an environmentally sensitive area (ESA) or discharges directly to an ESA • Soil at site is moderately to highly erosive (defined as having a predominance of soils with USDA-NRCS Erosion factors kf greater than or equal to 0.4) • Site slope is 5 to 1 or steeper • Construction is initiated during the rainy season or will extend into the rainy season (Oct. 1 through April 30). • Owner/contractor received a Storm Water Notice of Violation within past two years High Tier 3 Tier 3 - Medium Construction Threat Assessment Criteria Medium Tier 3 • All projects not meeting Tier 3 High Construction Threat Assessment Criteria Medium Tier 2 Tier 2 Hiqh Construction Threat Assessment Criteria • Project is located within the Buena Vista or Agua Hedionda Lagoon watershed, inside or . within 200 feet of an environmentally sensitive area (ESA) or discharges directly to an ESA 3 Soil at site is moderately to highly erosive (defined as having a predominance of soils with . USDA-NRCS Erosion factors kf greater than or equal to 0.4) SI Site slope is 5 to 1 or steeper SI Construction is initiated during the rainy season or will extend into the rainy season (Oct. 1 through April 30). • Owner/contractor received a Storm Water Notice of Violation within past two years m Site results in one half acre or more of soil disturbance High Tier 2 Tier 2 - Medium Construction Threat Assessment Criteria Medium Tier 2 • All projects not meeting Tier 2 High Construction Threat Assessment Criteria Medium Tler1 Tier 1 - Medium Inspection Threat Assessment Criteria Medium Tler1 • Project is located within the Buena Vista or Agua Hedionda Lagoon watershed, within or directly adjacent to an environmentally sensitive area (ESA) or discharges directly to an ESA • Soil at site is moderately to highly erosive (defined as having a predominance of soils with USDA-NRCS Erosion factors kf greater than or equal to 0.4) • Site slope is 5 to 1 or steeper • Construction is initiated during the rainy season or will extend into the rainy season (Oct. 1 through April 30). • Owner/contractor received a Storm Water Notice of Violation within past two years • Site results in one half acre or more of soil disturbance Medium Tler1 Tier 1 - Low Inspection Threat Assessment Criteria Low Tler1 • All projects not meeting Tier 1 Medium Construction Threat Assessment Criteria Low Exempt - Not Applicable -Exempt where it can be shown that a lesser or higher amount of storm water compliance inspection Is warranted in the opinion of the city engineer E-33 Page 1 of 1 REV 4/30/10 ^ CITY OF CARLSBAD STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 760402-2750 www.carlsfaadca.gov INSTRUCTIONS^ To address post-development pollutants that may be generated from development projects, the City requires that new development and significant redevelopment priority proiects incorporate Permanent Storm Water Best Management Practices (BMP's) into the project design per the City's Standard Uitan Stonnwater Management Plan (SUSMP). To view the SUSMP. refer to the Engineering Standards (Volume 4, Chapter 2) at www.cariabadca.qov/8tandafds. initiaily this questionnaire must be completed by the applicant In advance erf submitting for a developnent application (subdivision, dlsctetionary permits and/or constructten pennits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment prQ|ecL Dependhg on the outcome, your prqject will either be subject to 'Standard Stomnwater Recpjbements' or be subject to additional criteria called 'Priority Development Project Requirements'. Many aspects of project site design aiB dependent upon the storm water standards applied to a project Your responses to the questionnaire re^wesent an Initial assessment of ths proposed project conditions and Impacts City staff has responsibility for making the final assessmem after submission of the development application. If staff determines that the questbnnalre was Incorrectly filled out and is subject to more stringent storm wafer standards tfian IntBally assessed by you, this will result tn the retum of the development application as incomplete. In this case, please maice the changes to the questionnaire and resubmit to the City. If you are unsure about tha meaning of a question or need help in detemtining how to respond to one or more of the questions, please seek asslstanca firom Land Deveiopnoent Engineering staff. A separata completed and signed questionnaire must be submitted for each new devekifMnent applkstkm submlsskm. Only one completed and signed questionnaire Is required when multiple development applteations for the same project are submitted concunentiy. In addition to this questionnaire, you must also oompleta, sign and submit a Prtject Threat Assessment Form with construction permlta for the project. Please sfart by compfe(/ng Ssctfon 1 and follow the InstmcOons. When completed, sign the foim at the end and submit this wflft your application to the city. KCTKMt . MBtfDEVELOPMBiT {W4iaNB&[& DoM your pn^ect meet one or more of tho foDowing criteria: YES NO 1. MMMfmr auMAMBi»_of 10 or moro dw^lina units. Examoles: sinda bmilv homaa miiM.«Bmiiy ^^,^0^ condomlntum and spertmsnts 2. eommanU-anattrthm f-acra. Aiw develooment otherthan heaw industry or nMlrlnniiai Pmmpio.- h~ritp|i- laboratories and other medical ^littles; sducaUonal Institutions; recreational Mlities; munldpal fedlfties; commarclai nurearies; muitt-apartment tHitldlngs: car wash fBdllUes; mini-mails end other business comptexes; shopping malls; liotais; office bulldlnas: pubNc warehouses; automotive dealerships; airfields; and other Ight Imtotiial fadlltiaa. 3. Haaw ktdumlM 1 fliAia6v> orrater tfian f acrs. Examoles: manufedurnq (dants, food pinmoinQ ^h^^ mfltfti woridng fBdWea, printing plams, and fleet storaga areas (bus, tnicfc, etc.). ^/ 4. AutomeOva reoair shoo. A facilitv cateoorized In anv one of Standarrl indiMtital aaoMnMrn «ir) otio 5014,5541,7532-7534. and 7536-7539 V 5. RuteiHBfita. Anv fiacilltv that sells Dreoared foods and drinks ibr consumoflon. Includh^ ttaOmar/ innAh ~...,»<i» and reitsshmsnt sfmds eelllng prepared foods and drinks for ImmediBte oonsumption (SIC code 5812), t^era the land araa for devetopment is greater than 5.000 square faelL Reataurants where land development Is less than 5,000 square (eet shall nwat all SUSMP requirements except for stmctural dBatment and numeitc sizing criteria requirBmeniB and hydruTMddicatlon requirements. E-34 Pagel of 3 REV 1/14/11 ^ CITY OF CARLSBAD STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services land Devekipment Engineering 1635 Faraday Avenue 760^2-2750 www.carIsbadca,gov 6. HWslda daveloomont Anv develODment that creates mofe than 5.D0D aquara fiaai nf Impominii. n-Ml in located in an area with known erosivB sdl conditions, where Ihe development will grade on any natuid slope that Is twenty-five percent (26%) or greater. V 7. EmImnmmtallv SonatOva Araa (ESA}\ All devalooment loeated within or diratiiy ndpcnn^^ ^ ^ dISThamIng directiy' to an ESA (where disdiarges from the developmenl or redevelopment win enter reotiving watere wilhin ihe ESA), widch either creates 2.600 equare feet or nme of Imperious surface on a proposed project site or hcreases the area of Imperviousness of a proposed project site 10% or more of its naturally oocunlna condition. 8. Parldna lot. Area of 5.000 square feet or more, or with 15 or more paridnq spaces, and patanttally nxpnu^ in ifrhnn runoff V .Q Straafs. roads, hfahwavs, and frsewavs. Anv caved surface that la S 000 Rqunra fimt nr gnah.^ transportation of automobiles, tnicks, motorcycles, and other vahides ~— 10. R^taH Gaaollna Outlets. Servina mora than 100 vehicles per day artdgniaiarlhansnnoiufiiamfiaaf 11. Coastal Oevo/oomerrt Zone. Anv onriecl located within 200 feet of the Pacific Ocnan anrf m»rf<.. nn^^ 2500 square feet of impervious surfeoe or (2) btcreases impervious surltea on property by more thai 10%. X/ 12. More than f-acre of d/ofifriwnce. Proiect results In the disturbance of 1-acm or mora of land at^ ^ rrm«klerBd a Pollutant-generating Development Project*. v/ 1 ^ BUb^ Significance by lha «de Wiiv Resounsa CMrttel Boanl (Wstor Qustty Contn:! r>lan br (he Swi Olego Ba«ki (1994) and amendments) wstsr bo^ dadgniM wim ttw RARE benelhiat UM by ha Sat* Witv RaaounM Contml BoHd oren de$ignBted at preserves or ItMir equivalent under ths MM Species Connnnillon Pmgram wkhin tNe CWee and County of San DIaga; and any other (oidvitoiTt environmentally senative aiaaa nnhlch have been Identgiad by tm CopennBlaas. 2 *DlrBCily e4a«si€'meana atbalad wUdn 2D0 M of Ihe ErivininniantalV Sm 3 mchaiBing direclty ta* means outBow from a dndnaga oom«v«iwe Byalem Ihtt not commingled wUh How from a^laoenllaruli, ^ * Pollutant-generating Oavalapment Prejects ara those projects that ganerata poltaBiia d levels giaalsr Ihan background tovda. hi general, ttiesa hduda el ptoieate Biat contribute to an oitaedanea to en impaired walar body or vrtiid) cnaia new bnpervtoua sutfeeas greater than 5000 square faal andAir introduce new landaombia areas IhrtieqtAaroMllnauaa of ferMata and peaBddea. In rrMWt cases gnasr|»lhw»ypfq|ecl8 that OTfcrlnliaqueiTlvehldeuw, such ea eweraencyy eeeeaa, or Ibr padaslrian or bicyde usa, ara not considered Pdfutant.«eneratlng Oeveloptnent Prtfeds If they are buM with pervious eurttees or V they steet llow ID siBinumlng psivlaua sufBEes. INSTRUCTIONS: Sactlonl Reaulte! If you answered YES to ANY of the questions above, your project is subject to Priority Devalofmant Prajact raqulrenienlB. SMb Seciion 2 ani please preceed to Sectlan 3. Ciieck (he Imeets PFUORITY DEVELOPMENT PROJECT requiramwitB' box tn Section 3. AddUoial stomi vrater rBqidiements wfll apply per the SUSMP. If you answered NO to AU. of lha questions above, then please pnoceed to Secdon 2 and ftaOow the instrtjctions. E-34 Pa882of3 REV 1/14/11 ^ CiTY OF CARLSBAD STORM WATER STANDARDS QUESTIONNAIRE E-34 Develooment Services Land Development Engineering 1635 Faraday Avenue 760^2-2750 www.carisbadca.gov asmoNZ SIGNmCANT BEOEVELOPMENT INSTRUCTIONS: Complets the questions below regarding your project 1. Prplect reeidts in ihe dlstwiiance of 1-acre or more of land and is considered e Pollutant-generating Development Project*? YES INSTRUCTIONS: if you answered NO, please proceed to questton Z if you answered YES, than you ARE e significant redevelopment and you ARE suijjeci to PRlORmr DEVELOf>MENT PROJECT requirements. Please chedc the 'meets PRIORITY DEVELOPMENT PROJECT requirements" box in Section 3 below. NO 2. Is the pti^ect redeveloping an ewsting priority project type? (Priority pnajects ate defined in Seclion 1) INSTRUCTIONS: If you answered YES, please proceed to question 3. -—— If you answered NO, then you ARE NOT a atgniiicanl redevelopment and your project is subject to STANDARD STORMWATER REQUIREMENTS. Piease chedc the 'does not meet PDP requirements' box In Section 3 below. 3. Is the wort( ilrrtted to trenchhtg and resurfacing associated with utility wmK; fesurfaolng and reconfiguring surface paridng iota and exisb'ng roadways; new eldewallQ bike lane on existing road and/w routine mdntenance of damaged pavement such es potiiole repair? Resurfadng/reconfiguring paridng bts Is where ths worit does not expose underiying sdl during conslniction. INSTRUCTIONS: If you answered NO, then proceed to question 4. if you answered YES, then you ARE NOT a significant redevelopment and your pn#ct Is subject to STANDARD STORMWATER REQUIREMENTS. Piease chedc the "does not meet PDP requirements" box in SecBon 3 below. 4. Will your redavelopinef« pmjficl create, replace, or add at least 5.000 squara feet of Impervious surfaces on e»3ting developed propeity or will your project be located wilhin 200 feet of the Pactffc Ooean and (1) create 2500 square feet or more of Imperious auriiace or (2) inoeeses impenrfnis surface on the properiy by more than 10%? Replacement of existing imperviouB surfaces Inchjdes any activity that is not part of routine maintenance where impenrious materiel(s) era rBtnovadjWPOsino undartvinq aoli during constmction. , INSTRUCTIONS: If you answered YES, you ARE a significant redevelopment, and you ARE subject to PRiORiTY DEVELOPMENt PROJECT requirements. Piease chedt the 'meets PRIORITY DEVELOPMENT PROJECT requirements' box In Section 3 betow. Review SUSMP to find out if SUSMP teqtdiements apfdy to your project envelope or Ihe entire project sits. If you answered NO, then you ARE NOT a significant redevelopment and your project Is subject to STANDAiU) STORMWATER REQUIREMENTS. Please check lha 'does not meet PDP requirements' box In Sectton 3 below. for dallnHion see Footnote 4 on page 2 SECTIONS QUESTIONNAIRE RESUtTS • My project meets PWOIUTY DEVELOPMENT PROJECT (PDP) requirements and must comply with e&litional slomiwater criteria per the SUSMP and i understand i must prepare a Stonn Water Management Plan Ibr submittal at time of appDcallon. I uivierBland flow control (hytftomodflcation) requirementa may ap^ to my picjact. Refer ID SUSMP Un- detdla. My project does not meet PDP requirementa end must only comply with STANDARD STORMWATER REQUIREMENTS per the SUSMP. As part of these requirements. I wiH hoorponrta low impact davetepment strateqlea throughout mv project Applicant InforniaUon and S^nalure Box Address: Rancho Santa Fe & La Costa Ave AssBSSOt's Parcel NumberCs): 223-050-70 Applicant Name: Applicant TIfie; AppifcantSIgnafura: ' %{r Date; *' Qly Conoumnea: YE8 NO Date E-34 Pase3of3 REV 1/14/11 ATTACHMENT 2 Single Sheet Post-Construction BMP Exliibit ATTACHMENT 3 DMA/IMP Sizing Exhibit 100 SCALE: 1" = 100' LEGEND SURFACE ROADWAYS, DRIVEWAYS, SIDEWALKS (CONCRETE OR ASPHALT). . ROOES. ,,,, LANDSCAPING (LAWNS. PARKWAYS) LANDSCAPING (SELF-TREATING SLOPES). . SYMBOL AREA 27.740 SE 35.460 SE 67,714 SE 25.522 SE LID EXHIBIT DRAINAGE AREA 2 LA COSTA TOWN SQUARE RESIDENTIAL PREPARED: JANUARY 2012 CONSULTA 2710 Loker Avenue West Suite 100 Carlsbad, California 92010 760 931-7700 Fax; 760-931-8680 ODayConsultants.com Civil Engineering Planning Processing Surveying l:\001017\_Residentiol\Stormwa1er\SWUP\LID-Area2.dwg Feb 28, 2012 10:08Qm Xrefs: 10177UTL; 10)7TP01; 1090NGflD; 1090FGRD; 1090FUTL; 1090FMAP; 1090fSTR; 1090NUTL: 1090NGRD-OS; DMA-Areos; 1017PLAN 100 SCALE: 1" = LEGEND SUREACE ROADWAYS DRIVEWAYS SIDEWALKS (CONCRETE OR ASPHALT). ROOES. LANDSCAPING (LAWNS. PARKWAYS) LANDSCAPING (SELF-TREATING SLOPES). SYMBOL AREA 50,995 SE 22,750 SE 42,005 SE 52 708 SE LID EXHIBIT DRAINAGE AREA J LA COSTA TOWN SOUARE RESIDENTIAL PREPARED: JANUARY 2012 CONSULT A^JTS 2710 Loker Avenue West Suite 100 Carlsbad, California 92010 760-931-7700 Fox; 760-931-8680 ODayConsultants.com Civil Engineering Planning Processing Surveying I \001017\_Residenlial\Stormwater\SWMP\LID-Area3.dwg Feb 28, 2012 10:09am Xrefs: 10177UTL: 1017TP01; 1090NGBD; 1090FGRD; 1090FUTL; 1090FMAP; 1090FSTR; 1090NUTL; 1O90NGRD-0S; DMA-Areos; 1017PLAN / 0' 200' 100' SCALE: 1" = 100" LEGEND SUREACE ROADWAYS, DRIVEWAYS SIDEWALKS (CONCRETE OR ASPHALT). ROOES. MAINTENANCE ACCESS (CRUSHED AGGREGATE)... LANDSCAPING (LAWNS. PARKWAYS) LANDSCAPING (SELF-TREATING SLOPES). SYMBOL AREA 48,157 SF 78 120 SE 499 SE 126,651 SE 45,892 SE UD EXHIBIT DRAINAGE AREA 1 LA COSTA TOWN SQUARE RESIDENTIAL PREPARED: JANUARY 2012 2710 Loker Avenue West Suite 100 Corlsbad, California 92010 760-931-7700 Fax; 760-931-8680 ODayConsultants.com Civil Engineering Planning Processing Surveying l;\001017\_Residential\Stormwoler\SWMP\LID-Areol,dwg Feb 28, 2012 lO Olom Xrels: 10177UTL; 1017TP01: 1090NGRD: 1090FGRO; 1090FUTL; 1090FUAP; 1090FSTR; 1090NUTL: 1090NGRD-0S; OMA-Areos; 1017PLAN 100 SCALE: 1" - 100' LEGEND SUREACE ROADWAYS DRIVEWAYS SIDEWALKS (CONCRETE OR ASPHALT). ROOES. LANDSCAPING (LAWNS PARKWAYS) LANDSCAPING (SELF-TREATING SLOPES). SYMBOL AREA 26,252 SE 40250 SE 72.987 SE 24557 SE LID EXHIBIT DRAINAGE AREA 4 LA COSTA TOWN SOUARE RESIDENTIAL PREPARED: JANUARY 2012 CONSULT A^T S 2710 Loker Avenue West Suite 100 Carlsbdd, Culifornii] 92010 760-931-7700 Fax; 760-931-8680 ODayConsultants.com Civil Engineering Planning Processing Surveying l:\001017\_Residentioi\Stormwater\SWMP\UD-Areo4.d«g Feb 28 2012 lO-llom Xrefs: 10177UTL; 1017TP01; 1090NGRD; 1090FGRD; 1090FUTL; 1090FMAP: 1090FSTR; 1090NUTL: 1090NGRD-0S; DMA-Areos: 1017PLAN ATTACHMENT 4 BMP Calculator Output Project Summary \ •' Project Name Project Applicant Jurisdiction Parcel (APN) Hydrologic Unit Compl^iance Basin Summary Basin Name: Receiving Water: Rainfaii Basin Mean Annual Precipitation (inches) Project Basin Area (acres): j LCTS-Residential I O'Day Consultants, Inc. I City of Carlsbad Carlsbad Watershed Area (acres): Drainage Area I POC#l Oceanside 13.3 6.83 0.00 SCCWRP Lateral Channel Susceptiblity (H, M, L): SCCWRP VerUfical Channel Susceptiblity (H, M, L): Overall Channel Susceptibility (H, M, L): Lower Flow Threshold (% of 2-Year Flow): HIGH i 0.1 Drainage Management Area Summary ID Type BMP ID Description Area (ac) Pre-Project Cover Post Surface Type Drainage Soil Slope 14861 Drains to Pond BMP 1 Paving 1.11 Pervious (Pre) AC Pavement Type D (high runoff - clay soils) Moderate (5 - 10%) 14919 Drains to Pond BMP 1 Roofs 1.79 Pervious (Pre) Roofs Type D (high runoff - clay soils) Steep (greater 10%) 14920 Drains to Pond BMP 1 Landscape 3.91 Pervious (Pre) Landscaping Type D (high runoff - clay soils) Steep (greater 10%) 14958 Drains to Pond BMP 1 DG Road 0.01 Pervious (Pre) DG Type D (high runoff - clay soils) Moderate (5 - 10%) Pond Facility Summary Scenario Description Bottom Area (sqft) Top Area (sqft) Depth (ft) Volume (eft) Low Orifice (in) Low Invert (ft) High Orifice (in) High Inveil (ft) Weir Length (ft) Weir Invert (ft) Facility Soil Drawdown (hrs) Design A Basin 1 5,218 6,600 2.0 13,296.1 2.5 0.00 18.00 0.75 10.00 1.25 D 3.00 Project Summary Project Name Project Applicant i Jurisdiction r Parcel (APN) Hydrologic Unit Compliance Basin Summary Basin Name: Receiving Water: Rainfall Basin r' Mean Annual Precipitation (inches) Project Basin Area (acres): Watershed Area (acres): SCCWRP Lateral Channel Susceptiblity (H, M, L): SCCWRP Vertificai Channel Susceptiblity (H, M, L): Overall Channel Susceptibility (H, M, L): Lower Flow Threshold (% of 2-Year Flow): LCTS-Residential O'Day Consultants, Inc. City of Carlsbad Carlsbad Drainage Area 2 P0C#1 Oceanside 13.3 3.49 0.00 HIGH 0.1 Drainage Management Area Summary ID Type BMP ID Description Area (ac) Pre-Project Cover Post Surface Type Drainage Soil Siope 14978 Drains to Pond BMP 2 Paving 0.64 Pervious (Pre) AC Pavement Type D (high runoff - clay soils) Moderate (5 - 10%) 14979 Drains to Pond BMP 2 Roofs 0.77 Pervious (Pre) Roofs Type D (high runoff - clay soils) Steep (greater 10%) 14980 Drains to Pond BMP 2 Landscape 2.09 Pervious (Pre) Landscaping Type D (high runoff - clay soils) Steep (greater 10%) Pond Facility Summary Scenario Description Bottom Area (sqft) Top Area (sqft) Depth (ft) Volume (eft) Low Orifice (in) Low Invert (ft) High Orifice (in) High Invert (ft) Weir Length (ft) Weir Invert (ft) Facility Soil Drawdown (hrs) Design A Basin 2 5,062 9,053 4.00 28,232.5 3.0 0.00 18.00 1.5 10.00 3.0 A 6.0 Project Summary I Project Name Project Applicant Jurisdiction Parcel (APN) Hydrologic Unit Compliance Basin Summary Basin Name: Receiving Water: Rainfall Basin Mean Annual Precipitation (inches) Project Basin Area (acres): Watershed Area (acres): I LCTS-Residential I O'Day Consultants, Inc. i I City of Carlsbad i Carlsbad Drainage Area 3 POC#l Oceanside 13.3 3.41 0.00 SCCWRP Lateral Channel Susceptiblity (H, M, L): SCCWRP Vertificai Channel Susceptiblity (H, M, L): Overall Channel Susceptibility (H, M, L): Lower Flow Threshold (% of 2-Year Flow): HIGH 0.1 Drainage Management Area Summary ID Type BMP ID Description Area (ac) Pre-Project Cover Post Surface Type Drainage Soil Slope 15003 Drains to Pond BMP 3 Paving 0.71 Pervious (Pre) AC Pavement Type D (high runoff - clay soils) Moderate (5 - 10%) 15004 Drains to Pond BMP 3 Roofs 0.52 Pervious (Pre) Roofs Type D (high runoff - clay soils) Steep (greater 10%) 15005 Drains to Pond BMP 3 Landscape 2.17 Pervious (Pre) Landscaping Type D (liigh runoff - clay soils) Steep (greater 10%) Pond Facility Summary Scenario Description Bottom Area (sqft) Top Area (sqft) Depth (ft) Volume (eft) Low Orifice (in) Low Invert (ft) High Orifice (in) High Invert (ft) Weir Length (ft) Weir Invert (ft) Facility Soil Drawdown (hrs) Design A Basin 3 4,500 6,902 4.00 22,805.2 3.0 0.00 18.00 1.5 10.00 3.0 A 5.00 Project Summary Project Name f' Project Applicant r Jurisdiction Parcel (APN) Hydrologic Unit Compliance Basin Summary Basin Name: Receiving Water: Rainfall Basin r Mean Annual Precipitation (inches) r " • Project Basin Area (acres): Watershed Area (acres): SCCWRP Lateral Channel Susceptiblity (H, M, L): SCCWRP Vertificai Channel Susceptiblity (H, M, L): Overall Channel Susceptibility (H, M, L): Lower Flow Threshold (% of 2-Year Flow): LCTS-Residential I O'Day Consultants, Inc. I City of Carlsbad Carlsbad Drainage Area 4 POC#l Oceanside 13.3 3.82 0.00 HIGH 0.1 Drainage Management Area Summary ID Type BMP ID Description Area (ac) Pre-Project Cover Post Surface Type Drainage Soil Slope 14997 Drains to Pond BMP 4 Paving 0.60 Pervious (Pre) AC Pavement Type D (high runoff - clay soils) Moderate (5 - 10%) 14998 Drains to Pond BMP 4 Roofs 0.92 Pervious (Pre) Roofs Type D (high runoff - clay soils) Steep (greater 10%) 14999 Drains to Pond BMP 4 Landscape 2.23 Pervious (Pre) Landscaping Type D (high runoff - clay soils) Steep (greater 10%) Pond Facility Summary Scenario Description Bottom Area (sqft) Top Area (sqft) Depth (ft) Volume (eft) Low Orifice (in) Low Invert (ft) High Orifice (in) High Invert (ft) Weir Length (ft) Weir Invert (ft) Facility Soil Drawdown (hrs) Design A Basin 4 4,500 5,637 2.00 10,137.3 3.0 0.00 18.00 0.5 10.00 1.0 A 2.00