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Home My WebLink About3811; El Camino Real Widening Project Water Quality; El Camino Real Widening Project Water Quality; 2008-06-04WATER QUALITY TECHNICAL REPORT PROJECT: PALOMAR AIRPORT ROAD WIDENING CIP 3811 LOCATION: PALOMAR AIRPORT ROAD BETWEEN PASEO DEL NORTE AND ARMADA DRIVE Prepared by: Jacob Moeder, P.E. Associate Engineer City of Carlsbad Public Works Engineering Design Division 1635 Faraday Avenue Carlsbad, CA 92008 Date: June 4, 2008 TABLE OF CONTENTS Vicinity Map Project Description Topography and Land Use Hydrologic Unit Contribution Pollutants and Conditions of Concern Water Quality Environment Water Quality Preservation Measures Maintenance Site Map/Drainage Study SUSMP Application Form Filterra Planter Box Specification Section 02372 Beneficial Use Definitions Rational Method Calculations Miscellaneous Reference Material Public Works Engineering Division June 4, 2008 Page 5 5 6 8 9 10 Appendix A Appendix B Appendix C Appendix D Appendix E Appendix F Appendix G Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 INTRODUCTION This report is being compiled to comply with the City's National Pollutant Discharge Elimination System (NPDES) permit. Based on the checklist provided in Appendix B ofthe City's Standard Urban Strom Water Mitigation Plan (SUSMP), this project is subject to Priority Project Permanent Storm Water BMP Requirements and Standard Permanent Storm Water BMP Requirements. Since the project is considered a Priority Project, a Water Quality Technical Report shall be prepared and filed (Section II, Step 2, Part A (ii)). The Water Quality Technical Report should include the items shown in the checklist provided In Appendix D ofthe SUSMP. Additionally, for construction activities, the site Is categorized as a Medium Priority. Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 VICINITY MAP V 1 / KMW Figure 1: Project Vicinity Map. PROJECT DESCRIPTION The project includes widening Palomar Airport Road (PAR) by adding one additional through lane between Paseo Del Norte (PDN) and Armada Drive, installing an overhead Caltrans Tmss Sign Structure, and constmcting a deceleration lane for the flower field's parking lot. These improvements are within the City's right of way. However, these improvements require relocating two traffic signals at the Northeast comer of PAR and PDN, which are Caltrans signals. The project will require grading, relocating/replanting landscaping, and the Installation of Filterra planter boxes to control water quality. The impervious surface area will increase by approximately 0.58 acres. Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 TOPOGRAPHY AND LAND USE There is a 2% crown from the center median to the concrete curb and gutter on PAR between PDN and Aramada Drive. The gutter slopes range from 0.5% to 2.5%. For approximately 600 feet, there is a landscaped berm with Coast Live Oak and White Alder trees, Bower Vine ivy, and Red Fescue for ground cover. For approximately 900 feet, there is Natal Plum located at the back of sidewalk. All of the landscaping is currently irrigated with potable water. The same landscaping will be reinstalled at the back of sidewalk as part of the PAR widening project. However, the landscaping will be irrigated with reclaimed water. The Armstrong Flower Fields are located north of the proposed improvements. The Flower Fields are zone for open space. HYDROLOGIC UNIT CONTRIBUTION The project is located in the Hydrologic Unit shown in Table ^\ Table 1 also shows the Hydrologic Area that the project site drains to. Per the Clean Water Act (CWA) Section 303, the Agua Hedionda Lagoon has a low priority for Total Maximum Daily Load (TDML) for bacteria indicators and sedimentation/siltation. The Agua Hedionda Creek has a low priority for TDML for Total Dissolved Solids (TDS). Table 2 shows the project contribution to the Carlsbad Watershed based on project acreage. Hydrologic Unit Hydrologic Area Name Hydrologic Unit Basin Number Carisbad 904 Agua Hedionda Lagoon 904.31 Agua Hedionda Creek 904.32 Encinas 904.40 Table 1: Hydrologic Unit in the Project Vicinity Hydrologic Unit Basin Number Watershed Area (Acres) Approx. Project Area (Acres) Estimate Project Contribution (%) 904 134,400 1 0.00074 Table 2: Project Contributions to Watershed Based on the drainage study, the impacts to the hydrologic regime is that the watershed will see approximately an additional 2.3 cfs of flow for a 2 year-6 hour storm event and approximately an additional 3.1 cfs for a 10 year-6 hour storm event, due to the increase in impervious surface area. See Table 3 for a breakdown of the change in flows and receiving waters. http:/AAWw.waterboards.ca.qov/sandleao/Droarams/basin plan/SAN%20DIEGO%20RWQCB%20 BASIN%20PLAN%20MAP.pdf Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 Event Increase Flow to Agua Increase Flow to Hedionda Laggon (cfs) Encinas(cfs) 2 year- 6 hour 0.67 1.59 10 year- 6 hour 0.89 2.17 Table 3: Change In 1 lows and receiving waters. POLLUTANTS AND CONDITIONS OF CONCERN Per the SUSMP, for road widening projects ("Streets, Highways, & Freeways") the anticipated pollutants of concern are the following: • Sediments • Nutrients (since landscaping exists) • Heavy Metals • Organic Compounds, including petroleum hydrocarbons • Trash & Debris • Oil & Grease And Oxygen Demanding Substances are considered a potential pollutant for road widening projects. Descriptions ofthe pollutants are shown In Table 4. Sediments Sediments are soils or other surficial materials eroded and then transported or deposited by the action of wind, water, ice, or gravity. Sediments can increase turbidity, clog flsh gills, reduce spawning habitat, lower young aquatic organisms survival rates, smother bottom dwelling organisms, and suppress aquatic vegetation growth. Nutrients Nutrients are inorganic substances, such as nitrogen and phosphorus. They commonly exist in the fomri of mineral salts that are either dissolved or suspended in water. Primary sources of nutrients in urban runoff are fertilizers and eroded soils. Excessive discharge of nutrients to water bodies and streams can cause excessive aquatic algae and plant growth. Such excessive production, referred to as cultural eutrophication, may lead to excessive decay of organic matter in the water body, loss of oxygen in the water, release of toxins in sediment, and the eventual death of aquatic organisms. Heavy Metals Metals are raw material components in non-metal products such as fuels, adhesives, paints, and other coatings. Primary source of metal pollution in stomn water are typically commercially available metals and metal products. Metals of concem include cadmium, chromium, copper, lead, mercury, and zinc. Lead and chromium have been used as corrosion inhibitors In primer coatings and Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 cooling tower systems. At low concentrations naturally occurring in soil, metals are not toxic. However, at higher concentrations, certain metals can be toxic to aquatic life. Humans can be impacted from contaminated groundwater resources, and bioaccumulation of metals in fish and shellfish. Environmental concerns, regarding the potential for release of metals to the environment, have already led to restricted metal usage in certain applications. Organic Compounds Organic compounds are carbon-based. Commercially available or naturally occurring organic compounds are found in pesticides, solvents, and hydrocarbons. Organic compounds can, at certain concentrations, indirectly or directly constitute a hazard to life or health. When rinsing off objects, toxic levels of solvents and cleaning compounds can be discharged to storm drains. Dirt, grease, and grime retained In the cleaning fiuid or rinse water may also absorb levels of organic compounds that are harmful or hazardous to aquatic life. Trash & Debris Trash (such as paper, plastic, polystyrene packing foam, and aluminum materials) and biodegradable organic matter (such as leaves, grass cuttings, and food waste) are general waste products on the landscape. The presence of trash & debris may have a significant impact on the recreational value of a water body and aquatic habitat. Excess organic matter can create a high biochemical oxygen demand in a stream and thereby lower its water quality. Also, in areas where stagnant water exists, the presence of excess organic matter can promote septic conditions resulting in the growth of undesirable organisms and the release of odorous and hazardous compounds such as hydrogen sulfide. Oxygen- Demanding Substances This category includes biodegradable organic material as well as chemicals that react with dissolved oxygen in water to form other compounds. Proteins, carbohydrates, and fats are examples of biodegradable organic compounds. Compounds such as ammonia and hydrogen sulfide are examples of oxygen- demanding compounds. The oxygen demand of a substance can lead to depletion of dissolved oxygen in a water body and possibly the development of septic conditions. Oil and Grease Oil and grease are characterized as high-molecular weight organic compounds. Primary sources of oil and grease are petroleum hydrocarbon products, motor pnDducts from leaking vehicles, esters, oils, fats, waxes, and high molecular-weight fatty acids. Introduction of these pollutants to the water bodies are very possible due to the wide uses and applications of some of these products in municipal, residential, commercial, industrial, and construction areas. Elevated oil and grease content can decrease the aesthetic value of the water body, as well as the water quality. Table 4: Description of pollutants. Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 WATER QUALITY ENVIRONMENT Table 4 depicts the beneficial use for the Agua Hedionda Lagoon and Creek. See Appendix E for the definitions of the uses. Beneficial Use Agua Hedionda Lagoon Agua Hedionda Creek MUN X AGR X IND x X REC-1 x X REC-2 X X COMM X WARM X COLD MAR X WILD X X BIOL RARE X MIGR X SPWN X SHELL X NAV POW FRSH AQUA X SAL EST X BSA WQE FLD WET CUL Table 4: Beneficial uses for Agua Hedionda Lagoon And Creek. Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 W WATER QUALITY PRESERVATION MEASURES SOURCE CONTROL e^fP - POST CONSTRUCTION: The foiiowing decal will be installed at the three curb inlets for this project. Figure 2: Storm drain inlet decal. STRUCTURAL TREA TI\AENT BMP - POST CONSTRUCTION: Filterra planter boxes (or approved equal) will be installed at three locations, two along Palomar Airport Road, and one on Paseo Del Norte. See the Site Plan in Appendix A for location and size. The expected average pollutant removal rates are in the in Appendix C. As shown on the "Filterra Overview" sheet in Appendix C, the average retained Total Suspended Solids (TSS) is 82%. This will control the amount of sediments that leave the project site and enter the Agua Hedionda Lagoon. The Filterra boxes were sized based on the fiow criteria stated under the Numeric Sizing Treatment Standards of the City's SUSMP. The Flow based approach requires that 0.2 inches/hour be treated for each hour of storm event. As shown in the Appendix C, under "Table: 1 Filterra Quick Sizing Tables" the Filterra planter boxes treat drainage areas based on the size of the planter box, drainage area, and the runoff coefficient, assuming 0.2 inches/hour treatment rate. Although bacteria entering the Agua Hedionda Lagoon are of concern, bacteria are not anticipated as one of the potential pollutants for the road widening project, per Table 2 under Section III of the SUSMP. CONSTRUCTION BMPS: Since the project is considered a Priority Project, construction BMPs required under Order No. 99-08-DWQ of the State General Permit for Storm Water Discharges Associated with Constmction Activity, also known as the State General Construction Permit. Specification Section 02372 shown in Appendix D Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report Public Works Engineering Division June 4, 2008 is included in this report to shown that the construction Storm Water Pollution Prevention Plan (SWPPP) wilt be prepared by the Contractor. Since construction sites are confinually changing and the SWPPP must be kept current during the course of construction, it is best to leave the preparation and maintenance ofthe SWPPP thejesDonsMiiy of thsiiooJcaataL This project will bo looo than 1 aoro, therefore a Water Pollution Control Plan (WPCP) is jJ<required. MAINTENANCE The Filterra planter boxes needs to be maintained periodically. The maintenance involved includes, removing the metal grates and removing debris that may have collected, cleaning the underiying perforated pipe of sediments and roots that may have entered the pipe, and replacing the media in the planter box. The City will maintain the units or a maintenance agreement with Filterra will be exercised. Filterra maintains the planter boxes for^^^l^O^annuQlly. DRAINAGE STUDY " ^ /y^.t./yr See "Site Plan" for watershed areas and fiows for a 2 year and 10 year stonn event. Also, see "Pre-development and Post-development Comparison" in the Appendix F to see how the rational method was applied to detemriine the change in flows do to the change in impervious surface area. Palomar Airport Road Widening Project PRELIMINARY Water Quality Technical Report 10 Appendix A -RW- RW EAST WATERSHED f 8 u NOTES: NEAR BY WATER BODIES: PACIFIC OCEAN AND AGUA HEDIONDA LAGOON SITE DRAINS TO AGUA HEDIONDA LAGOON. REMOVAL NOTES: [T] CONS77?UCr NEW AC PAVEMENT . [Fj CONSTRUCT 1,509 LF OF NEW CONCRETE CURB AND GUTTER. (Tj CONSTRUCT 7.618 SF OF NEW CONCRETE SIDEWALK. \T\REL0CATE UGHT POLE AND PULL BOX [sjCONSTRUCT CALTRANS TRUSS SIGN STRUCTURE [6]EXTEND STORM DRAIN UNE AND CONSTRUCT NEW CURB INLET [7]LNSTALL NEW TRAFFIC SIGNAL. |T| CONSTRUCT NEW CHAIN UNK FENCE. [Y|RELOCATE RRE HYDRANT TO BACK OF SIDEWALK, ^NEW CROSSWAU< STRIPING. [II]NEW LANE STRIPING, ^NEW BIKE LANE STRIPING, ^INSTALL NEW 10'X6' HLTERRA PLANTER BOX \i4\lNSTAU. NEW 8'X4' FILTERRA PLANTER BOX ^9^^ T ' f^ EVENT INCHES —W (»-W Vh- 2 YR- 6 HR 1.2 tt— — tt « DIRECWN OF FLOW ARROW • 77ME OF CONCENTRATION PATH 10 YR- 6 HR 1.6 IMPERVIOUS AREA. SF (AC): WEST WATERSHED MIDDLE WATERSHED RECEIVING WATERS AGUA HEDIONDA LAGOON ENCINAS ENCINAS TOTAL NEW AC (j) 12.800 SF (0.29 AC) d) 6.710 SF (0.15 AC) (3)6.170 SF (0.14 AC) 25.680 SF (0.58 AC)* EXISTING AC 0J8,JOO SE (0.88 AC) (5)11,400 SF (0.26 AC) (6)23.000 SF (0.53 AC) 52.000 SF (1.67 AC) NEW CURB & GUTTER 1.554 SF (0.04 AC) 548 SF (0.01 AC) 920 SF (0.02 AC) 3.020 SF (0.07 AC) NEW CONCRETE SIDEWAU< 3.885 SF (0.09 AC) 1,370 SF (0.03 AC) 2.300 SF (0.05 AC) 7.555 SF (0.17 AC) TOTAL 56.539 SF (1.3 AC) 20.028 SF (0.45 AC) 32.390 SF (0.74 AC) SLOPE 2% 2% 2X DISTANCE 832' 314' 613' TIME OF CONCENTRATION 10.3 MIN 6.3 MIN 8.8 MIN INTENSITY. 2YR-6HR 2.1 IN/HR 2.7 IN/HR 2.3 IN/HR INTENSITY. 10YR-6HR 2.8 IN/HR 3.8 IN/HR 3.0 IN/HR FLOW 2YR EVENT. 02 2.3 CFS 1.0 CFS 1.4 CFS FLOW 10YR EVENT. 010 3.1 CFS 1.5 CFS 1.9 CFS - a- DATE INITIAL ENQNEER OF WORK REVISION DESCRIPTION OTHER APPROVAL SHEET 1 CITY OF CARLSBAD ENGINEERING DEPARTMENT SHEETS 1 PALOMAR AIRPORT ROAD V\/IDENING SITE PLAN DWN BY: . CHKD BY: RVWD BY: PROJECT NO. 3811 DRAWING NO Appendix B Storm Water Standards 4/03/03 VI. RESOURCES & REFERENCES APPENDIXA STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST rnmr^lPte Sections 1 and 2 of the following checklist to determine your project's SnLnt anTco^^^^^^^^ storm water best management practices requirements. Srm must be completed and submitted with your permit application. Section 1. Permanent Storm Water BMP Requirements: TanV answers to Part A are answered "Yes." your project is subject to the Pnon^ Procedure" in the Storm Water Standards manual. p"! an?Ti?.n™d -No.- prolec, Is .xemp, Iron, p.,m.n.nt storm water requirements. PartAiDetemill^^ 'Does the project meet the definition of one or more ot tne pnonty project yes No 1. Detached r^^iHpntial development of 10 or more units 2. Attached residential development of 10 or more units 3. Commercial development greater than 100.000 square feet 4. Automotive repair shop 5. Restaurant a Qt^on hiikiHp dPvelopment greater than 5.000 square feet — -^'"l ^- .h.n nr Ju^\ to 5 000 ft^ Of with at least 15 parking spaces 7. 9. 5.000 square feet or greater CO nti nue to Part B. , 30 Storm Water Standards 4/03/03 PartBiDete^^ Does the project propose: 1. New impervious areas, such as rooftops, roads, parking lots, driveways, p.uis and^ sidewalks? M^VA; pprvin. .s landscape areas and irrigation systems? Permanent structures within 100 fe'-t nt ^^ny natural water body? Yes 4. Trash storage areas? I in. liri nr solid material loading and unloading areas? ^ -J : 7Z i.,;^^ nr moiiitonani 6. LiqUlU UI ouiiu Miavpi'"' '^^""-a • ^ Vehicle or equipment fueling, washing, or maintenance areas?^ venicie or euuipmci'^ lucmiH, n> - — ; 7 Require a General NPDES Permit for Storm Water Discharges Associated with Industrial Activities (Except construction)?* 8. Commercial or industrial waste handling or storage, exciuqing lypical office or household waste? nuuaciiuiu Mvoji.-.^: -—--—— -n Any nnHinn nr nrnimd disturbance durinq construction t '-^ r , trt Qvictinn etnrm dra No y Any mouiiiyj vjiv^*^'m^iwi..—— ^ ——: — ;^rrg°es'sr;M=^^^^^ |at. www.swrcb.ca.gov/stormwtr/industrlal.html section 2. Construction Storm Water BMP Requirements: prioritization in Part D. below. PartCLPetem^^ Would the project meet any of these criteria during construction? 1. Mh^^F^iidiU^^ Discharges Associated With Construction Activities?— 2 nnoc fhP project propose qradina or son disturbance? 4. quamy ifTscharged from the site (such as, paints, solvents, concrete, and stucco)? ^ Yes X X No X X 31 Storm Water Standards 4/03/03 Part D- Determine Construction Site Priority circumstances that may P°/^J„.*^^?f *° ^^'befoTe construction. [Note: requirements.] • Aj Higli Priority 1) Projects where the site is 50 acres or more and grading will occur during the rainy season .. 5^ PrniPcts 5 acres or more 3) Projects 5 acres or more within or directly Kent to o[ discharging directly\o a coastal lagoon or other receiving water within an environmentally sensitive area Projects, active or Inactive, adjacent or tributary to sensitive water bodies ^ B) Medium Priority 1) capital improvement Projects where grading occurs, h°wever a Storr^Wate^ Pniiution Prevention Plan (SWPPP) is not required under the State benerai ^o^sMn Pets (i.e., water and sewer replacement projects, intersection and street re-alignments, widening, comfort stations, etc.) 9^ Pprmit nroiects in the public right-of-way where grading occurs, such as S tirofsirev;afk,'substan'^ retaining walls, curb and gutter for an ent^ire street frontage, etc.. however SWPPPs are not required. 3) Permit projects on private property where grading permits are required, however Notice Of Intents (NOIs) and SWPPPs are not required. • c; Low Priority 1) Capital Projects where minimal to no grading occurs, such as signal light and loop installations, street light installations, etc. 2) Permit projects in the public right-of-way where mirrimal to no grading occurs, ' such as pidestrian ramps, driveway additions, small retaining walls, eta. •^^ pprmit nroiects on private property where grading permits are not required '^uT as' smar Lining' walls, single-family homes, small tenant improvements, etc. 32 Appendix C Filterra Overview Stonnwater Bioretention Filtration System Save valuable space with small footprint for urban sites Improve BMP aesthetics with attractive trees or shaibs Reduce lifetime costs with safer and less expensive maintenance Remove Pollutants and Comply with NPDHS Filterra"' is wcll-suitcd for the ultra-urban environment with high removal effieiencies for many pollutants such as petroleum, heavy metals, phosphorus, nitrogen, 1'SS and bacteria. FilteiTa" is similar in concept to bioretention in its function and applications, with the major distinction that Filterra" has been optimized for high volume/flow treatment and high pollutant removal. It takes up little space (often 0.2% Filter Surface Area./Drainage Area) and may be used on highly developed sites such as landscaped areas, green space, parking lots and streetscapes. Filterra** is exceedingly adaptable and is the urban solution for Low Impact Development. Stormwater flows through a specially designed filter media mixture contained in a landscaped concrete container. The filter media captures and immobilizes pollutants; those pollutants are then decomposed, volatilized and incorporated into the biomass of the Filterra" system's micro/macro fauna and flora. Stormwater runoff flows through the media and into an underdrain system at the bottom ofthe container, where the treated water is discharged. Higher tlows bypass the Filterra" via a downstream inlet structure, curb cut or other appropriate relief Expected Average Pollutant Removal Rates (Ranges Varyinu with Particle Size, Pollutant Loading and Site Conditions) TSS Removal 82% Phosphorous Removal ' 73% Nitrogen Removal 43'M. Heavy Metal Remo\'al 33%-82% Fecal CoHform 57"'o - 76% * Predicted Oil & Grease > 85% Standard tiicnd ww^v.filterra.com Table 1: Filterra® Quick Sizing Table (Western Zone - 0.2 In/hr Uniform Intensitv Approach) Available Filterra® Box Sizes (feet) Recommended Commercial Contributing Drainage Area (acres) where C = 0.85 Outlet Pipe 4x6.5 or 6.5x4 up to 0.35 4" SDR-35 PVC 4x8 or 8x4 0.36 to 0.44 4" SDR-35 PVC Standard 6x6 0.45 td 0.49 4" SDR-35 PVC 6x8 or 8x6 0.50 to 0.65 4" SDR-35 PVC 6x10 or 10x6 0.66 to 0.82 6" SDR-35 PVC 6x12 or 12x6 0.83 to 0.98 6" SDR-35 PVC Available Filterra® Box Sizes (feet) Recommended Residential Contributing Drainage Area (acres) where C = 0.50 Outlet Pipe 4x6.5 or 6.5x4 up lo 0.60 4" SDR-35 PVC 4x8 or 8x4 0.61 to 0.74 4" SDR-35 PVC Standard 6x6 0.75 to 0.83 4" SDR-35 PVC 6x8 or 8x6 0.84 to 1.11 4" SDR-35 PVC 6x10 or 10x6 1.12 to 1.39 6" SDR-35 PVC •6x12 or 12x6 1.40 to 1.67 6" SDR-35 PVC Notes: 1. All boxes are a standard 3.5 feet depth (INV to IC) 2. A standard SDR-35 PVC pipe coupling is cast into the wall for easy connection to discharge drain 3. Dimensions shown are internal. Please add 1' to each for external (using 6" walls) 4. In line with TR55 data, for Commercial Developments a minimum (runoff coefficient) C factor of 0.85 is recommended. For Residential Developments, use of C factors less than 0.5 require individual site review by Filterra. 5. Please ask for Sizing Tables for other target treatment goals, e.g. 0.3 in/hr 6. This sizing table is valid only for CA, NV, AZ, OR, ID, AK & HI 04-13-07 www.filterra. com Toll Free: (877)345-1450 il o Bioretention Plant/Soil/Microbe Complex Removes Pollutants, TSS. Phosphorous, Nitrogen, Heavy Metals, Hydrocarbons, etc. New or Existing Catch Basin, Curb Cut or Other Means of Overflow Relief Curb and Gutter Biodegradation Treated Stormwater Underdrain System A Growing Idea in Stormwater Filtration. U.S. Patent #6,277,274 #6,569,321 Appendix D the Construction the construction documents. SECTION 02372 STORM WATER POLLUTION PREVENTION PART 1 - GENERAL 1 1 SECTION INCLUDES B. Compliance with local, state, and federal regulations. C Payment of application and annual fees required by the State Water Resources Control Board (SWRCB) until the date of Substantial Completion. D Certification that the Project has met all of the conditions of the General Construction Activity Storm Water Permit (GCASP). 1.2 RELATED SECTIONS A GENERAL PROVISIONS Section 2-5.3: Submittals B GENERAL PROVISIONS Section 8: Facilities for Agency Personnel C. GENERAL PROVISIONS Section 9; Measurement and Payment PART 2 - PRODUCTS 2.1 MATERIALS A Provide the quality grade, and type of materials as specified in the City of Carlsbad Srtmem of Public Wo;ks - Development Best Management Practices - Part A - Construction Activities. PART 3 - EXECUTION 3.1 QUALITY ASSURANCE A. Comply with the following as a minimum requirement: 1 The City of Carlsbad Department of Public Works " ^e^f Management Practices in accordance with Order no. 2001-01 SUSMP and General Provisions Section 7-8.6. 3.2 PREPARATION AND SUBMITTAL STORM WATER POLLUTION PREVENTION 01/19/06 02372-1 CARLSBAD MASTER SPECIFICATIONS A. B. C. D. E. Project site. Prepare Notice of Intent application. Submit application and application ^ee made oavab e to State Water Resources Control Board. Instructions for completing the Tppncation can b^^^ on the State Water Resources Contro Board web site. h^tp-/A.AAAA/ciwrcb.ca.aov/5^tr.rnl^Artr/ae^ const html#const permit Prepare Checklist by downloading instructions from the State Water Resources Control hHp-^/A/i!^ r.nnst.html#const permit Prepare SWPPP by downloading template from www.cabmphandbooks.com shall be implemented at no cost to OWNER. 3.3 IMPLEMENTATION A. Install perimeter controls prior to starting Work at the Project site. B. Certain on-site storm water on the Project site. Do not drain on-site water directly into the storm drain. C. Designate trained personnel for the proper implementation of the SWPPP. Revise SWPPP to suit changing Project site conditions and also when properly installed systems are ineffective. Upon Substantial Completion: Leave storm water pollution prevention controls in place when required for post- SuS storm water management and remove those tha are not needed as determined by OWNER. OWNER will maintain prevention controls left in place. Provide Site Monitoring Reports. SWPPP revisions. Compliance Certifications and elated documents to OWNER. Post-construction storm water operation and the ma^age^^^^^^^ as mentioned in the compliance certifications are considered to be in place at Final Completion. 3.4 MONITORING rnnduct examination of pollution prevention controls on a monthly basis as well as hpfnrrlnd X^each s orm and each day during extended storm events. Prepare and Sain att P^^^^^^^^^ log of each Inspection using Site Monitoring Report forms. Notify to RWQCB within 30 days if there is any noncompliance. STORM WATER POLLUTION PREVENTION 01/19/06 ,„ 02372-2 CARLSBAD MASTER SPECIFICATIONS D A. 1. 2. 3.5 LIABILITIES AND PENALTIES A Review of the SWPPP and inspection log by OWNER shall not relive CONTRACTOR fromll^Wies arising from non-compliance of storm water pollution regulations. B Payment of penalties for non-compliance by CONTRACTOR shall be the sole responsibility of CONTRACTOR. C Compliance with the Clean Water Act pertaining is the ^°'^^/^!P\"^^^^^^ CONTRACTOR Any fine against OWNER due to non-compliance by CONTRACTOR. OWNER shall recover all costs of the fine by appropriate assessment. 3.6 CHANGE OF INFORMATION A Submit to OWNER completed NOl Form for change of information (Construction Site Information and Material Handling/Management Practices). 3.7 ATTACHMENTS A. Attachment A - Compliance Certification. B. Attachment B - Site Monitoring Report. 01/19/06 CARLSBAD MASTER SPECIFICATIONS STORMWATER POLLUTION PREVENTION 02372-3 ATTACHMENT "A" GENERAL CONSTRUCTION ACTIVITY STORM WATER PERMIT COMPLIANCE STATE OF CALIFORNIA STATE WATER BOARD WDID NO Name of Project: Project Description: Contract Number ANNUAL CERTIFICATION I ..rtifw thP Proiect has met the following conditions: All elements of the Storm Water Pollution managTm'ent requirements including erosion/sediment control requirements, and the appropriate use permits have been obtained. CONTRACTOR: Print Name: Signature: Title: Date: FINAL COMPLETION CERTIFICATION construction storm water operation, and management plan is in place. CONTRACTOR: Print Name: Signature: Title: Date: 01/19/06 CARLSBAD MASTER SPECIFICATIONS STORMWATER POLLUTION PREVENTION 02372-4 ATTACHMENT "A" STORM WATER POLLUTION PREVENTION SITE MONITORING REPORT STATE OF CALIFORNIA STATE WATER BOARD WDID NO Name of Project: Project Description: Contract Number I. Type of Examination: (Use one form for each type of examination): • Prior to Anticipated Storm Event • After Actual Storm Event • Monthly Event Date Examined: 11. Check the response for each SWPPP question below: 1 Do you have an approved Storm Water Pollution Prevention Plan (SWPPP) and a BMP Handbook on the Project site? . , , n 2. Does your SWPPP incorporate an up-to-date erosion control plan ? 3 Is the erosion control installed per plan? , .^A -.C 4 s the Work at a stage where the erosion control plan cannot be constructed, is hferoTon control at the Maximum Extent Practicable for the stage you are in? 5 Did you observe the presence of any floating matenals such as oil, grease, pieces of wood, paper, etc., odor, toxics, and/or sediments? 6. If yes, what is that you observed? ^ III Check the status of the following items as observed: NO YES • • • • • • • • • • SWPPP Items Not Repairs Acceptable Acceptable Required 1. De-silting Basins (Cleaned) 2. Water Quality Basin 3. Silt Fences 4. Hay bales/Check dams/Sandbags 5. Berms and Dikes 6. Sand/Gravel Inlet • • • • • • • • • • • • • • • • • • Date Repairs Completed 01/19/06 CARLSBAD MASTER SPECIFICATIONS STORMWATER POLLUTION PREVENTION 02372-5 Appendix E BENEFICIAL USE DEFINITIONS Municipal and Domestic Supply (MUN) - Uses of^at^r for community^ military or individual water supply systems including, but not limited to, drinking water supply. Aaricultural Supply (AGR) - Uses of water for farming, horticulture, or ranching indrnrbut noHmited to, irrigation, stock watering, or support of vegetation for range grazing. Industrial Service Supply (IND) - Uses of water for industrial activities that do not depend primarily on water quality including, but not limited to, minirig, cooling water supply, hydraulic conveyance, gravel washing, fire protection, or oil well depressurlzation. Industrial Process Supply (PROC) - Uses of water for industrial activities that depend primarily on water quality. Groundwater Recharge (GWR) - Uses of water for natural or artificial recharge of groundwater for purposes of future extraction, maintenance of water quality, or halting of saltwater Intrusion into freshwater aquifers. Water Contact Recreation (REC-1) - Uses of water for recreational activities invoMng 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, suri^ing, white-water activities, fishing, or use of natural hot spnngs. Non-Contact Water Recreation (REC-2) - Uses of water for reational activiti^es involving proximity to water, but not normally involving body contact with water^^here nqestlon of water Is reasonably possible. These uses include, but are not limbed to, pIcnS sunbathing, hiking, beachcombing, camping, boating, tide PO°l and marine life study hunting, sightseeing, or aesthetic enjoyment in conjunction with the above activities. Commercial and Sport Fishing (COMM) - Uses of water for ^o^^^^^;^'.. .. recreational collection of fish, shellfish, or other organisms including, but not limited to, uses involving organisms intended for human consumption or bait purposes. Warm Freshwater Habitat (WARM) ~ 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. Cold Freshwater Habitat (COLD) - Uses of water that support cold water ecosystems PncS^^^^ ta preservation or enhancement of aquatic habitats, vegetation, fish, or wildlife, including invertebrates. Marine Habitat (MAR) - Uses of water that support marine ecosystems including but not limited to, preservation or enhancement of marine habitats, vegetation such as kelp, fish, shellfish, or wildlife (e.g., marine mammals, shorebirds). Wildlife Habitat (WILD) - Uses of water that support terrestrial ecosystems Including, bu nonim?ted to presen/atlon and enhancement of terrestrial habitats, vegetation, « (e g. mammals, birds, reptiles, amphibians, invertebrates), or wildlife water and food sources. Preservation of Areas of Special Biological Significance (BIOL) - Includes marme Nfe refuges, ecological reserves and designated areas of special biological significance, such as areas where kelp propagation and maintenance are features of the marine environment requiring special protection. Rare Threatened, or Endangered Species (RARE) - 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. Migration of Aquatic Organisms (MIGR) - Uses of water that support habitats necessary for migration or other temporary activities by aquatic organisms, such as anadromous flsh. spawning, Reproduction, and/or Early Development (SPWN) - Uses of water^^^^^^^^ support high quality aquatic habitats suitable for reproduction and early development of fish. Shellfish Harvesting (SHELL) - Uses of water that support habitats suitable for the collection of filter-feeding shellfish (e.g., clams, oysters, and mussels) for human consumption, commercial, or sports purposes. Navigation (NAV) - Uses of water for shipping, travel, or other transportation by private. Military or commercial vessels Hydropower Generation (POW) ~ Uses of water for hydropower generation. Freshwater Replenishment (FRSH) - Uses of water for natural or artificial maintenance of surface water quantity or quality (e.g., salinity). Aauaculture (AQUA) - 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. Inland Saline Water Habitat (SAL) - Uses of water that support inland saline water ecosyste^^^^^^^ but not limited to, preservation, or enhancement of aquatic saline habitats, vegetation, fish, or wildlife, including invertebrates. Estuarine Habitat (EST) - Uses of water that support estuarine ecosystems including. Lt non^ited to, pUriation or enhancement of estuarine habitats vegetation, fish, shellfish, or wildlife (e.g., estuahne mammals, waterfowl, shorebirds). .. «- * A^^^^ /RQA\-1 |QP«? nf water that support areas or habitats that SPAS) whTre the preservation of natural resources requires special protection. oualih/ Enhancement (WQE): Beneficial uses of waters, including wetlands and !!hIrw^terbodfef tharsupport na" enhancement or improvement of water quality in or dornstr^^^^^^ but not limited to, erosion control, filtration and puSfonTnaS occul water pollutants, streambank stabilization, maintenance of channel integrity, and siltation control. Flood Peak Attenuation/Flood Water Storage (FLD): Beneficial uses of riparian wetlandsTn flood pl^in areas and other wetlands that receive natural surface drainage and buffer its passage to receiving waters. Wetland Habitat (WET): Uses of water that support natural and man-made wetland ecSstems including, but not limited to, preservation or enhancement of unK,ue weTanXctions, vegetation, fish, shellfish, invertebrates, insects, and wildlife habitat. Native American Culture (CUL): Uses of water that support the cultural and/or t^adltona» of ind geno^ people such as subsistence fishing, basket weaving and I^X^sW^ coZL. navigation to traditional ceremonial locations, and ceremonial uses. Appendix F A U^iuB ^f^A/ T^yiT 'TMS l^tl^ f3S LB^> TM^f^ T^^T ':^J^£^ To AG-tM hEOipt^rpA (AHL) 72? £;^o«£i"«o•^ (5- CXiA 3.5O c.-f^ 4 .72- ^/^ To 5P 5N'$r^/V7 San Diego County Hydrology Manual Section: WB Date: June 2003 P^S^- °^ WB.2 WORKBOOK EXAMPLES FOR HYDROLOGY MANUAL SECTION 3.0 RATIONAL METHOD AND MODIFIED RATIONAL METHOD WB.2.1 Rational Method J f='^pi^jfi rnB ^/rs: (Reference Hydrology Manual Section 3.3) The following example details the application of the RM for a single-family residential subdivision to calculate the peak flow entering an inlet in the storm drain system. In this example, the 100-year storm event is used. In this example, the soil type (determined from the soils maps in Appendix A ofthe Hydrology Manual) is uniform across all subareas and is type D. Figure WB.2-1 shows the drainage map for this example. Flow across the initial subarea First, consider the initial subarea, nodes 0101 to 0102 in Figure WB.2-1. C = 0.52 (read from Table 3-1 of the Hydrology Manual for single-family residential, 4.3 dwelling units per acre [DU/A] or less, type D soil) Aoioi-0102 = 0.4 acres ECCA) = 0.21 L = 220 feet (estimated total flow length after development with house, driveway, garage, etc.) Use 70 feet maximum per Table 3-2 of the Hydrology Manual. ^ 332'-329.5' ^ o 011 or 1.1% slope (typical value for graded residential lot) 220' You can neglect the travel time for the remaining 150' across the pad since it will be small with respect to Ti Ti = 8.5 minutes (Figure 3-3 ofthe Hydrology Manual) ^tj^ ^£,4f^" U^^^£ ^?^7>/N£r£>. WB-3 Example Discharge Area - Rational Method FIGURE WB. 2-1 San Diego County Hydrology Manual Section: WB Date: June 2003 Page: 5 of 70 Using Ti, fill in the worksheet provided in Figure 3-1 of the Hydrology Manual. Use the isopluvial maps (Appendix B of the Hydrology Manual) to read the precipitation over a 6- hour period (Pe) and precipitation over a 24-hour period (P24) for the site. With the adjusted P6 value determined from the worksheet (Figure 3-1 of the Hydrology Manual), find the intensity, Iioo- For this example, let ?6 = 2.8 inches, and P24 = 4.5 inches. Pe is within 45% to 65% of P24; therefore, the adjusted Pe = 2.8 inches. Pe = 2.8 inches Iioo 5.2 in/hr Q0102 = ^CA)I = 0.21 (5.2) = 1.1 cfs Flow from point 0102 to 0103 The next step is to determine Tt for the length between point 0102 and 0103. The watercourse is a gutter and to calculate Tt it is necessary to know the water velocity, V, in the gutter. However, because the gutter is not a closed conduit, and flow from the subarea is being added, determination of Ti is an iterative process. To find V, assume an average Q over the watercourse (discharges for small watersheds typically range from 2 to 3 cfs per acre, depending on land use, drainage area, slope, and rainfall intensity). This is accomplished using the following method: • Estimate QAVG and slope, SAVG, to determine V. Estimate qavg as 2.5 cfs/acre. Assume QAVG = Qo]02 + ((qavg)(Aoio2-oio3)/2) QAVG = 1.1 cfs + ((2.5 cfs/acre)(1.8 acres)/2) = 3.4 cfs . 329.5'-326.8- ^ ^ 285' • From Figure 3-6 of the Hydrology Manual, use QAVG and slope, SAVG, to determine V. V - 2.4 fps WB-5 San Diego County Hydrology Manual Section: WB Date: June 2003 Page; 6 of 70 Then: 285' J = _—_ = 119 seconds = 2.0 minutes 2.4 fps Tc = T, + Tt = 8.5 + 2.0 = 10.5 minutes • Use Tc and the worksheet in Figure 3-1 of the Hydrology Manual to redetermine f 100. I'loo = 4.6 in/hr Qp =2(CA)I Qoio3 [CAoioi-0102 + CA0102-0103] I'lOO = [0.52(0.4) + 0.52 (1.8)] 4.6 = 5.3 cfs Check the earlier assumption that QAVG from node 0102 to node 0103 was 3.4 cfs. QAVG = QO]02 + ((Q0103 - Qoio2)/2) QAVG = 1.1 + ((5.3 - 1 .1)/2)= 3.2 cfs ^ 3.4 cfs At this point, retry the calculation with a different estimate of qavg, say 2.3 cfs/acre for the area from nodes 0102-0103. Assume QAVG = Q0102 + (qavg)(Aoio2-o]03) QAVG = 1.1 cfs + ((2.3 cfs/acre)(1.8 acres)/2) = 3.2 cfs • From Figure 3-6 of the Hydrology Manual, input QAVG and slope, SAVG, to determine V. V = 2.4 fps Then: Tt = 285V2.4 = 119 seconds - 2.0 minutes WB-6 San Diego County Hydrology Manual Section: WB Date: June 2003 Page: 7 of 70 Tc = Ti + Tt = 8.5 + 2.0 - 10.5 minutes • Use Tc and the worksheet in Figure 3-1 of the Hydrology Manual to redetermine I'lOO- I'loo = 4.6 in/hr QO103 ~ [CAoiOl-0102 + CA0102-OIO3] I'lOO = [0.52 (0.4) + 0.52 (1.8)] 4.6 = 5.3 cfs Check the earlier assumption that QAVG from point 0102 to point 0103 was 3.2 cfs. QAVG = Q0102 + ((Q0103 - Qoi02)/2) QAVG = 1.1 + ((5.3 - l.l)/2)= 3.2 cfs = 3.2 cfs; OK Final results for node 0103: Q0103 = 5.3 cfs Tc ~ 10.5 minutes Iioo = 4.6 inches/hour A = 0.4+1.8 = 2.2 acres WB-7 100 LU u. z UJ o 1 Q UJ CO CC o o a: UJ EXAMPLE: Given: Watercourse Distance (D) = 70 Feet Slope (s)=1.3% Runoff Coefficient (C) = 0.41 Overland Fiow Time (T) = 9.5 Minutes T _ 1.8(1.1-C)VD" SOURCE: Airport Drainage, Federal Aviation Administration. 1965 F I G 1 Rational Formula - Overland Time of Flow Nomograph 3. Directions for Application: (1) From precipitafion maps determine 6 hr and 24 hr amounts for the sele<^ed frequency. These maps are induded in the County Hydrology Manual (10,50, and 100 yr maps induded in the Design and Procedure Manual). (2) Adjust 6 hr precipitation (if necessary) so that it is within the range of 45% to 65% of the 24 hr precipitaUon (not applicaple to Desert). (3) Plot 6 hr precipitation on the right side of the chart. (4) Draw a line through the point parallel to the plotted lines. (5) This line is the intensity-duration curve for the location being analyze<r Application Form: (a) Selected frequency lo year '24 (b) Pg= 1'^ in..P24 (c) Adjusted Pg'^^ = in. (d) t^- min. IC?--?, '^•'5, (e) != in./hr. Note: This chart replaces the Intenstty-Duration-Frequency curves used since 1965. 1 1.5 2 2.5 3 3.5 4 4.5 s' 5.5 6 Dutalicn i i 1 } 1 1 1 1 i 1 t 5 2 63 3.95 5.27 6,59 7^ 9.22 10.54 \i.S6 13.17 14,49 15,81 7 2.12 3.18'4,24 5.30 6.36 7.42' 8.48 9.54 10.60 11.66 12.72 10 1.68 2.53* 3.37 4.21 5,05 5.90" 674 7.58 8.42 9,27 lo.n 15 1.30 1.9S 2,59 324 3.89 4,54 5.19 5.84 6.49 7.13 7,78 20 t.OB 1.62"" 2.15 2.69 3-23' 3-77 '4:31 4,85 5.39 5.S3 646 25 093 1,«5 1.87 2,X3 280 3.27 3.73 4^20 4.67 5,13 5.K) 30 0.83 rZ4 1,66 2.07 2 49 2,90 3.32 3.73 4.15 4.56 4.98 40 0.69 1.03:1.36 1,72 2 07 2 41 276 310 3.45 379 4 13 50 O.GO 'O.M" 1.19 1.49 !.79 z.tra 2.39 2.69 2.98 328 3.58 60 0.53 0,80" 1,06 \.23 1.59 1,86 2.12 2,39 2^ 292 3 18 90 0,41 0.61 0.82 1.02 1.23 1,43 1.63 184 2.04 2,25 2.45 120 0.34 '0.51:0.68 0.85 1.02 1.19 1.38 1 53 1,70 1,87 2,04 150 0.29 0.44 0-59 0.73 0.^ 1,03 1.18 1.32 1.47 ^.G2 1,76 180 0.26 0.395 0,52 0,65 0.78 0.91 1,04 1.18 1.31 1,44 1,57 240 022 0.33 0-43 0,54 0 65 0.76 0-87 0.9S 1-08 MS 1.W3 300 0.19 '0,28" 0.38 047 0,56 0-W 0.75 0.85 0.94 1,03 1,13 0.17 ""0.25! 0.33 0,42 O.M 0.58 0.67 0.75 0.84 0.92 1,00 FIGURE lntenslty-Duratk>n Design Chart * Template Directions for Application: (1) From precipttatiOT maps detemiine 6 hr and 24 hr amounts for ttie selected ^uency. These maps are induded in the County Hydrology Manual (10,50. and 100 yr maps induded in the Design and Pro<^ure Manual). (2) Axijust 6 hr precipitation (if necessary) so that it is within the range of 45% to 65% of the 24 hr precipitation (not applicaple to Desert). (3) Plot 6 hr precipitation on the right side of the chart. (4) Draw a line through the point parallel to Uie plotted lines. (5) "niis line is the intensity-duration C3jrve for the location being analyzed. IP" F" ^'£r Application Form: (a) Selected frequency (b) P( in.,P24 (c) Adjusted Pg'^' = 2. (d) t,= min. ^^'-^y 6.3 ^'8.^ (e) I = O-1 in./hr. Note: This chart replaces the Intensily-Duration-Frequency curves used since 1965. P6 1 1.5 2 2.5 3 3.5 4 4.5 S 5.5 6 Outation 1 1 1 ! j i 1 1 1 1 1 5 263 3,95 5,27 5,59 7.«) 9 22 10,54 11.^ 13 17 14.49 15,81 7 2,12 318 4,24 5-30 6,36 7.42 9,54 10.60 11.66 12.72 10 2,53 3,37-4,21 5.05 5,W3 6,74 7.58 8.42 9.27 10.11 15 I.:K) I.9S 2,59 324 3.89 4.54 5,19 5,84 6.49 7.13 7.79 20 1,06 1.62* 2.15' 2:59 3-23'3.77' 4.31 4,85' 5,39 5,93 6.46 25 0,93 1,*3 1,87 2.M 2 80 3,27 3.73 4,20 4.67 5,13 5.60 30 0,K1 1,24' 1,66 2,07 2.49 '2,90 3.32 3,73 4.15 4.M 4.98 40 0,^ 1,03- 1.36 1,72 2 07 2 41 2 76 310 3.45 3.79 4.13 50 060 O.K) 1.19 1.49 t 79 2,09 2,39 2.69 2.98 3,28 3.58 «) 053 '0,B0' 1.<^ 1 33 1.59 l.M 2,12 2.39 2,^ 3.18 90 0.41 0,61 0.82 1.02 1.23 1.43 1,63 1,84 2.04 2,25 245 120 0.34 0.51 0.68 0.te 1.02 1.19 1,36 1.53 1.70 1,87 2.04 150 0.29 0,44 0,59 0.73 O.W 1,03 1.16 1.32 1.47 1,K? 1.76 180 0,26 0,39 O.K O.K "0.:^ 0.91 1 04 1,18 1.31 1.44 1.57 240 0.22 0.33' 0.43 0,54 0.65' 0.76 0.87 0,98 1.03 1,19 * 1 30 i300 0.19 0,28^0,38 0.47 O.K O.M 0,75 0.85 0.94 1,<» 1.13 3£0 0-17 0.25 0.33 0.42 0,M) 0 58 0.67 0,75 0.B4 0.92 1.00 FIGURE Intensity-Duration Design Chart - Template Appendix G storm Water Standards 4/03/03 111. PERMANENT BEST MANAGEMENT PRACTICES SELECTION PROCEDURE When referred to this Section, by Step 2 of Section II, complete the analysis required for your project in the subsections of Section 111.1 below. 1. IDENTIFY POLLUTANTS & CONDITIONS OF CONCERN A. Identify Pollutants from the Project Area Using Table 1, identify the project's anticipated pollutants. P^l'^^^^^tf, ^'^^^^^^'^J*^ anThazardous material sites that have been remediated or are not threatened by he orooosed proiect are not considered a pollutant of concern. Projects rnee ing the dSn of more than one project category shall identify all general pollutant categones that apply. Table 2. Anticipated and Potential Pollutants Generated by Land Use Type. ' ' Genera/ Pollutant Categories Project Categories Detached Residential Development Attached Residential Development Commerdal Development >100,000ft2 Sediments X Automotive Repair Restaurants Hillside Development >5,000 ft2 Parking Lots Streets, Highv/ays & Freeways Nutrients Heavy Metals Organic Compounds p(i) P(i) X P(i) p{1)X P(2} X{«)(5) Trash & Debris Oxygen Demanding Substances X X X p{1) Oil& Grease Bacteria & Viruses p(2) P(5) X X X P(1) p(5) p{1) P(3) Pesticides P(5) P(1) X = anticipated P = 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) Induding solvents. ^ ^ ^ 12 JUL storm Water Standards 4/03/03 B Identify Pollutants of Concern in Receiving Waters Fnr nrioritv projects, the following analysis shall be conducted and reported in the project's Water Quality Technical Reporl: 1 For each of the proposed projects discharge points, identify the receiving water(s) mat each discharge point proposes to discharge to, including hydrologic unit basin number(s) as identified in the most recent version of the lA/afer Quality Control Plan forte S Diego Basing prepared by the San Diego Regional Water Quality Control Board. 9 iriPntifv anv receiving waters, into which the developed area would discharge to, S on the most recent lisi of Clean Water Act Section 303(d) impaired water bodies" List any and all pollutants for which the receiving waters are impaired. qitP.^ tributan/ to Clean Water Act section 303(d) water bodies impaired for sediment anrstes dTschargfng directly into environmentally sensitive areas (ESA) require additional B^^^ implementation' These sites are by definition classified as posing a high mreat to water quality. In the 1998 303(d) listing, the Agua Hedionda Lagoon is Sired for sediment and siltation, Buena Vista Lagoon also has '"^paired beneficial u^es Taquatic nfe) due to high sedimentation/siltation. Portions of Carlsbad where construcTon sites have the potential to discharge into a tributary of a 303(d) or directly into fsSd) wate^^^^^^^^^ or sites located within 200 feet of an ESA require additional BMP impSenSLn. These water bodies include the Pacific Ocean, Buena Vista Lagoon, Encinas Creek, Agua Hedionda Lagoon, and Batiquitos Lagoon. C Identify Conditions of Concern For priority project^ the following analysis shall be conducted and reported in the project's Water Quality Technical Report: 1 Evaluate the project's conditions of concern in a drainage stody report prepared by a fegtterL cXngineer in the State of Califomia, with experience in the science o stream and river generated surface features (i.e., fluvial geomorphology) and water resources management. The report shall consider the project area's location from hriaraer watershed perspective), topography, soil and vegetation conditions, percSpe^ ous area'^ natural and infrastructure drainage featores and any other relevant Mrdogic and environmental factors to be protected specific to the project area's watershed. 9 As part of the drainage study, the applicant's civil engineer shall conduct a field Reconnaissance to observe and report on downstream conditions, including undercutting erosion, slope stability, vegetative stress (due to flooding, erosion^ wate quaS degradation, or loss of water supplies) and the area's susceptibility to erosion or habitat alteration as a result of any future upstream development. n n..,^- h«n.//>«™wswrcb ca aov/~rwqcb9/Programs/Basin_PLanning/Basin_PLan/basin_plan html 3. Go to; rpi«:Z:srcb;S:g— san Diego is in Region 9 (a link ,s provided). 13 storm Water Standards 4/03/03 3 The drainage study shall utilize the most recent edition of the San Diego County ' Hvdroloqy Manual, compute rainfall runoff charactehstics from the project area Including at a minimum, runoff volume, time of concentration, and retention volume. These characteristics shall be developed for the two-year and 10-year frequer^cy, Tvoe I storm of six-hour or 24-hour duration (whichever Is the closer approximation of the site's time of concentration), during critical hydrologic conditions for soil and vegetative cover^. The drainage study shal! also report the projects conditions of concern based on the hydrologic and downstream conditions discussed above. Where downstream conditions of concern have been identified, the drainage study shall establish that pre-project hydrologic conditions that minimize impacts on those downstream conditions of concern would be either improved or maintained by the proposed project, satisfactory to the City Engineer, by incorporating the permanent BMP requirements identified in Section 111.2. below. 2. ESTABLISH PERMANENT STORM WATER BEST MANAGEMENT PRACTICES After identifying the project's pollutants of concern, and conditions of concern Jor prlS prefects), in Section 111.1, projects subject to standard or Pno«^^^^^^ equirements shall implement all applicable site design. below. Projects subject to priority project requirements must also ^P'^^"^ ^^J^^^^^^^ applicable to individual priority project categories and structural t^^^ -iient control BMPs_ Applicants may employ alternative comparable and equally effective site design and source control BMPs (Including requirements applicable to individual pnonty project categories), satisfactory to the City Engineer. Prelects are encouraged to address these objectives through the creation of a hydrologlcally functional project design that attempts to mimic the natural hydrologic regime. Mimicking a site's natural hydrologic regime may be pursued by: - Reducing imperviousness. conserving natural resources and areas, maintaining and using natural drainage courses in the storm water conveyance system, and minimizing clearing and grading that Is necessary for the project. . Providing runoff storage measures dispersed uniformly throughout a site's landscape with the appropriate use of a variety of detention, retention, and runoff practices. . Implementing on-lot hydrologlcally functional landscape design and management practices. 4. Design storms can be found at http://wvw.wrcc.dri.edu/pcpnfreq html. 14 2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD RI:.<;i()N rvl'K N.AMK 9 K .\i;tia Hedionda C reek 9 F- Agua Elediuiida I.agooii '* K .Misotreek K .\li.so ( reek (mouth) 1"^ IJiiciia \ ista Lai •ipiiroveil by U.SHI' !,- 90431000 90431000 yo113000 90113000 90421000 I fital Dissolved Solids Low Urban Runoff/Storni StHcrs I nktiotvn .Nonpoint Source I'nknown point snnrie Nonpoinl/Poinl Source Nonpoinl/Poinl Source Bacteria Indicators .Sedimenlalion/Siltation Bacteria Indicators Lrban Runoff/Slorm Setters Unknown point source Nonpoint/Point Source ['h OS p horns hnpainiwiit Incated a! lower 4 milf.s. Urban RunolT/Storm Sewers I nknown Nonpoint Source Unknown point source Urban Runoff/Storm Sewers Unknown Nonpoint Source U nknown point source Toxicity Itacteria Indicators Bacteria Indicators Nutrients Nonpoiiit/PoinI Source Nonpoint/l'oinI Source Low Low Med in ni I -ow Low Mcdin ni Low Low Eslimaied s,:c of unpamwiit ,s 150 acres healed ui upper portion of lagoon .Nonpoinl/Point Source Scdimentalron/Siltalion .Medium 7 Miles 6.8 Acres 6.8 Acres 19 Miles 19 Miles 19 Miles 0.29 Acres 202 Acres 202 Acres 202 Acres .Nonpoint/Point Source PtiSe I of 16 storm Water Standards 4/03/03 PartD: Determine Construction Site Priority In accordance with the Municipal Permit, each construction site ^J^h construction storm water BMP rem^^reme^ must be designated with a priority: high, medium or low. This prforitLton m^s^ completed with this form noted on the plans and included in SwPPP or W^^^ Indicate the project's priority in one of the check boxes using the crte^^ beiow and existing and surrounding conditions of the project, the type °f Stes necessary to complete the construction and any other extenuating cPrcumstanclfthatlay pose a threat to water quality. The City reserves the right to S the Driorftv of the projects both before and during construction. [Note. fhrconst?urtirpriority does NOT change construction BMP requirements that apply to project arconSrll^U BMP requirements must be identified a case-by-case hai^s The construction priority does affect the frequency of inspections that wiH be conducted by CirS See Section IV.1 for more details on construction BMP requirements.] • A) High Priority 1) Projects where the site is 50 acres or more and grading will occur during the rainy season 2) Projects 5 acres or more. 3) Projects 5 acres or more within or direct^ adjacent to or discharging directly to a coastal lagoon or other receiving water within an environmentally sensitive area Projects, active or inactive, adjacent or tributary to sensitive water bodies W V U^/^^C^ ^^PicAT^P o'*-^ T/^Sr Fi-^^>* ^ B) Medium pnonty^ C^^n^A^^ X 1) Capital Improvement Projects where grading occurs, however a Storrn Water >r£i^^,^^^, Pollution Prevention Plan (SWPPP) is not required under the State General f^^y^^^ Construction Permit (i.e.. water and sewer replacement projects, intersection ^2?72. and street re-allgnments, widening, comfort stations, etc.) 2) Permit projects in the public right-of-way where grading occurs such as installation of sidewalk, substantial retaining walls, curb and gutter for an entire street frontage, etc. , however SWPPPs are not required. 3) Permit projects on private property where grading permits are required, however, Notice Of Intents (NOIs) and SWPPPs are not required. • 0) Lovj Priority 1) Capital Projects where minimal to no grading occurs, such as signal light and loop installations, street light installations, etc. 2) Permit projects in the public right-of-way where minimal to no grading occurs, such as pedestrian ramps, driveway additions, small retaining walls, etc. 3) Permit projects on private property where grading permits are not required such as small retaining walls, single-family homes, small tenant improvements, etc. 32 Storm Water Standards 4/03/03 APPENDIX D WATER QUALITY TECHNICAL REPORT GUIDELINES Purpose To describe the permanent storm water Best Management Practices (BMPs) that will be incorporated In the project to mitigate the Impacts of urban runoff due to the development Minimum Requirements ^ Prepared by Registered Civil Engineer nrqanization & Content ^Table of Contents i/Vicinity Map /Project Description ^ ij/Narrative of project activities Site Map , ... , . . B^Entire property included on one map (use key map if multi-sheetS; [/'Drainage areas and direction of flow Private storm drain system(s) ia^ Nearby water bodies and municipal storm drain inlets Location of storm water conveyance systems (ditches, inlets, storm drains, etc.) »^ Location of existing and proposed storm water controls Location of "impervious" areas- paved areas, buildings, covered areas Locations where materials would be directly exposed to storm water a- Location of building and activity areas (e.g. fueling islands, garages, waste container area, wash racks, hazardous material storage areas, etc.) T/ Areas of potential soil erosion (including areas downstream of project) Pollutants and Conditions of Concern • . a^Name and number of Cartsbad Watershed Hydrological Unitlmpaired water bodies downstream ofthe project and impairment a/ Impacts to hydrologic regime Pollutants based upon land use Types of BMPs: Site Design BMPs • Reduce impervious surfaces *^ • Conserve natural areas Minimize directly connected impervious areas •Protect slopes and channels 38 storm Water Standards 4/03/03 Source Control BMPs Inlet.stenciling and signage • Materials Storage • Trash storage • Efficient irrigation *^ • Other controls (as applicable) Structural Treatment BMPs 3^Basis for selection (include targeted pollutants, justification, and alternative ^nalysls) Design criteria (include calculations) ^ Pollutant removal information (other than vendor specifications) ^ Literature References Maintenance (I.e. identify the responsible parties who will implement the Best Management Practices) • Maintenance schedule • Maintenance Costs • Qualifications of maintenance personnel Drainage Study 39