Loading...
HomeMy WebLinkAboutCT 15-04; THE GRAND MADISON; STORM WATER MANAGEMENT PLAN; 2015-12-10E Ka.S ENGINEERING, INC. Planning Engineering Surveying STORM WATER MANAGEMENT PLAN (AMENDMENT #1) SWMP (15-25) FOR THE GRAND MADISON 725 GRAND A VENUE CARLSBAD, CA 92008 PROJECT ID. CT 15-04 December JO, 2015 PREPARED FOR GRAND MADISON, LLC 3005 S. ELA CAMINO REAL SAN CLEMENTE, CA 92672 PREPARED BY K&S ENGINEERING, INC. 7801 MISSION CENTER COURT, SUITE 100 SAN DIEGO, CA 92108 February 20, 2018 K&S Job No. 15-008 RECEIVED APR 1 0 2018 LAND DEVELOPMENT ENG!NEERING ~ /Date 7801 Mission Center ourl. Suite JOO. San Diego. California 92108. (619)296-5565 . Fax (619)296-5564 TABLE OF CONTENTS 1. Introduction I.A. Project Description I.B. Existing Site features and Conditions I.C. Proposed land use and anticipated activities affecting Stormwater I.D. Opportunities and constraints for Stormwater control and Treatment I.E. Nearby water bodies 11. Applicable Stormwater Standards II.A. Completed Stormwater Standards Questionnaire (SWSQ) I1.B. HMP Applicability Determination Ill. Identification of Pollutants of Concern Ill.A. Identification of Pollutants Generated by Land Use Type I11.B. Project Hydrologic Location 111.C. Identification of 303(d) Impaired Receiving Waters II1.D. Beneficial uses of receiving water II1.E. Identification of Primary Pollutants of Concern IV. Source Control Measures IV.A. Site activities and potential sources of pollutants IV.B. Permanent source controls, and operational source controls V. Low Impact Development (LID) Project Design Strategies VA. Optimization of Site Layout V.A.1 . V.A.1 . V.A.1 . V.A.1 . V.A.1. Limitation of development envelope Preservation of natural drainage features Setbacks of creeks, wetlands, and riparian habitats Minimization of imperviousness Using drainage as design element TABLE OF CONTENTS (continued) V. B. Layout and use of permeable pavements or other pervious surfaces V.C. Dispersal of runoff from impervious areas to pervious areas V.D. Drain Impervious Surfaces to Engineered TCBMP's or IMP's VI. Integrated Management Practices (IMPs) VI.A. Selection process for IMPs targeting pollutants-of-concern VI.B. Sizing factors for IMPs VI.C. Geotechnical recommendation on soil infiltration rates VI. D. Infiltration calculation (drawdown time) for any self-retaining areas serving as an IMP IX. Documentation of Stormwater Design IX.A. Drainage Management Areas IX.B. Tabulations IX. B.1. Self-treating areas IX. B.2. Self-retaining areas IX.B.3. Areas draining to self-retaining areas IX. B.4. Areas draining to IMPs/TCBMPs IX.B.5. Sizing Calculations X. BMP Facility Maintenance Requirements X.A. Description of ownership and responsibility of maintenance X.B. Summary of maintenance requirements for each stormwater Facility XI. SWMP Certification Statements XI.A. Preparer's statement XI.B. Owner's statement Attachments OMA/IMP Sizing Exhibit Erosion Control Plan I. Introduction This Storm Water Mitigation Plan (SWMP) is required under the City of Carlsbad ordinances. The purpose of this SWMP is to address the water quality impacts from the development of 725 Grand Avenue in the City of Carlsbad, California. The goal of the SWMP is to ensure that this project complies with the current California Regional Water Quality Control Board's requirements. This goal will be achieved by developing and implementing practicable policies to ensure to the maximum extent practicable that redevelopment does not increase pollutant loads from the project site and considers urban runoff flow rates, durations, and velocities. Best Management Practices (BMPs) and Integrated Management Practices (IMPs) wi ll be utilized to provide a long-term solution to water quality and flow control. This SWMP is intended to ensure the effectiveness of the BMPs through maintenance that is based on long-term planning. This SWMP is subject to revisions as needed to accommodate changes to the project design, or as required by the City and/or Engineer. I.A Project Description The project proposes the development of a four story building for thirteen condominiums for commercial, office and residential use. The disturbed area is 0.32 acres. The purpose of this addendum is to reflect a change in DMA 1 and the corresponding BMP located on the 4th floor. The Grand Madison 725 Grand Avenue VICINITY MAP Priority Development Project Storm Water Management Plan 2 L 1.8 Existing Site features and Conditions The project is located in the County of San Diego (APN 203-303-21). The site is bounded by Grand Avenue to the to the north, Madison Street to the west, an alley way to the east, and office buildings to the south. The property has an existing two story office building structure and asphalt concrete parking lot. Topographically, the site is flat (under 5 percent), sloping gently towards Grand Avenue and Madison Street. The on-site soil classification is Type-B from ArcGIS Web BMP Sizing Calculator Website (see References). The existing drainage for the site flows towards Grand Avenue and Madison Street catch basins. Two (2) Points of Compliance (POC) have been identified in the curb and gutter in Grand Avenue and Madison Avenue. See the Existing Hydrology Map. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 3 L I.C Proposed land use and anticipated activities affecting Stormwater The project proposes the development of a four st01y building (0.28 acres) for thirteen condominiums for commercial, office and residential use. The overall disturbed area is 0.32 acres. The roof, balcony, and courtyard drainage will be collected at different levels of the building in flow-thru planters and then conveyed treated via the building plumbing system to a discharge point facing Grand Avenue, and thence to the recently constructed 36-inch reinforced concrete (RCP) storm drain in Grand Avenue per City of Carlsbad Drawing No. 457-4H (See References) at Node 10. The remainder project area, which is located at the perimeter of the site, wiU sheet flow off-site to the alley, Grand Avenue, and Madison Street. The project is Exempt from hydromodificaton (refer to attached Figure 2-1 HMP Applicability Determination). Bioretention basins (Flow through planters) will be used as water quality treatment basins. The bioretention basins will use a "water quality only" sizing factor for an minimum area of 4 percent from Table 4-6 of the County SUSMP. The minimum areas for the bioretention basins were found by summing up the contributions of each tributary DMA and multiplying by the sizing factor (see DMA Drainage and Surface Type Calculations). The LID IMP Flow Through Planters are responsible for handling water quality requirements for each DMA. The flow through planters are been designed with a uniform surface depth of 4-inches. The IMP is comprised of an 18-inch layer of amended soil (a highly sandy, organic rich compost with an infiltration capacity of at least 5 inches/hr) and a 12-inch to 18-inch layer of gravel for additional detention to accommodate the french drain system. Flows of approximately 0.2 inches per hour will be diverted to the flow through planters for treatment. Flows will discharge from the basin via a perforated underdrain pipe within the gravel layer to a private storm drain system. A riser structure will be constructed within the IMP with and an emergency overflow set to 4-inches above the finished grade of the planter, such that peak flows can be safely discharged. These flow through planters, in our professional recommendation, are the most effective and most cost efficient BMP and meets the requirements of the Carlsbad SUSMP. (See Section VI.A Selection process for IMPs for more details). The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 4 L I.D Opportunities and constraints for Stormwater control and treatment The purpose of this section is to identify the constraints and opportunities that may affect the site design and selection of treatment and flow-control fac il ities. Constraints for this Project would be: The project proposes the development of a four story building for thirteen condominiums for commercial, office and residential use. The building footprint covers the majority of the project site. The space available to install bioretention basins at ground level is very limited. Opportunities for this project would be: With ground space limited for bioretention basins, flow through planters can be provided at multiple stories of the buildings. These proposed BMP's can be easily maintained through the implementation of a Storm Water BMP Maintenance Agreement. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 5 L 1.E Nearby water bodies According to the Water Quality Control Plan for the San Diego Basin prepared by the San Diego Regional Water Quality Control Board, the receiving water for the proposed project is the Buena Vista Lagoon located in El Saito Hydrologic Subarea (904.21 ), which is within Buena Vista Creek Hydrologic Area (904.20), part of the Carlsbad Hydrologic Unit (904.00). The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 6 L San Diego Hydrologic Basin Planning area excerpt: The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 7 II. Applicable Stormwater Standards This project is considered a Priority Development Project (PDP), which creates over 5,000 square feet of impervious area. See the completed Storm Water Standards Questionnaire (SWSQ) at next page. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 8 L C_ City of Carlsbad STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov r 1 1NstRucnoNs; To address post-development pollutants that may be generated from development projects, the City requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMP's) Into the project design per the City's Standard Urban Stormwater Management Plan (SUSMP). To view the SUSMP, refer to the Engineering Standards (Volume 4, Chapter 2). Initially this questionnaire must be completed by the applicant In advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be appried to a proposed development or redevelopment project Depending on the outcome, your project will either be subject to 'Standard Stormwater Requirements' or be subject to additional criteria called 'Priority Development Project Requirements'. Many aspects of project site design are dependent upon the storm water standards applied to a project. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than lnltially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the City. If you are unsure about the meaning of a question or need help In determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A separate completed and signed questionnaire must be submitted for each new development application submission. Only one completed and signed questionnaire Is required when multiple development applications for the same project are submitted concurrentiy. In addition to this questionnaire, you must also complete, sign and submit a Project Threat Assessment Form with construction permits for the project. Please start by completing Step 1 and follow tha instructions. When completed, sign tha form at the and and submit this with your application to Iha city. 1. Is your project LIMITED TO constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: (1) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non~rodlble permeable areas; OR (2) designed and constructed to be hydraulically disconnected from paved streets or roads; OR (3) designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets uidance? 2. Is your project LIMITED TO retrofitting or redeveloping existing paved alleys, streets, or roads that are deslgried and constructed in accordance with the USEPA Green Streets guidance? YES NO X X If you answered •yes· to one or more of the above questions, then your project is NOT a priority development project and therefore Is NOT subject to the storm water criteria required for priority development projects. Go to step 4, mark the last box stating "my project does not meet PDP requirements" and complete appllcant lnfonnatlon. If ou answered •no• to both uestlons. then o to Ste 2. E-34 The Grand Madison 725 Grand Avenue Page 1 of 3 Priority Development Project Storm Water Management Plan Effective 6127/13 9 L ( City of -....-.....lsbad STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov STEP)2 TOBE COIIP.liETEIU!OR'Al!.I!; NEW10R REDEVEllOPIIENT P.Ro:JECTS . To determine if your project Is a priority development project, please answer the following questions: YES 1. Is your project a new development that creates 10,000 square feet or more of Impervious surfaces collectively over the entire project site? This includes commercial, industrial, residanfial, mixed-use, end public X davalooment 01niacts on oub/lc or orivate land. 2. Is your project creating or replacing 5,000 square feet or more of Impervious surface collectivaly over the entire project site co an existing site of 10,000 square feet or more of Impervious surface? 111/s includes comman:ial, X industrial residential mixed-use, and Dublic deve/n=nt Droiects on Dub/le Dr arivate land. 3. Is your project a new or redevelopment project that creates 5,000 square feet or more of Impervious surface collectively over the entire project site and supports a restaurant? A restaurant is a facility that sells prepared X foods and drinks for consumption, Including stationary lunch countars and refreshment stands salting prepared foods and drinks for immediate consumDfion. 4. Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface collectively over the entire project site and supports a hillside development project? A hillside development project Includes development on any natural slope that is twenty-five pen;ent or greater. 5. Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface collectively over the entire project site and supports a par1dng lot A perldng lot Is a land area or facility for the X temoorarv Darkino or storage of motor vehicles used oarsonallv for business or for commen:e. 6. Is your project e new or redevelopment project that creates 5,000 square feet or more of Impervious surface collectively over the entire project site and supports a street, road, highway freeway or driveway? A street, X road, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles trucks, moton:vc/es and other vehicles. 1. Is your project a new or redevelopment project that creates or replaces 2,500 square feet or more of Impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive Area (ESA)? "Discharging Directly to" Includes now /her is conveyed overland a distance of 200 feet or less from the project to the ESA, or conveyed In a pipe or open channel any distance as an Isolated now from the project to the ESA (i.e. not comminoles with nows from adiacent lands).• 8. Is your project a new development that supports an automotive repair shop? An automotive repair shop Is a facility that Is categorized in any one of the following Standard Industrial Classification (SIC) codes: 5013, 5014 5541 7532-7534 or 7536-7539. 9. Is your project a new development that supports a retail gasoline outlet (RGO)? This category includes RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Dally Traffic (ADT) of 100 or more vehicles oer dav. 10.1s your project a new or redevelopment project that results In the disturbance of one or more acres of land and are expected to generate pollutants post construction? 11.ls your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of lmoervious surface or (2) increases impervious surface on the property by more than 10%? NO X X X X X X If you answered 'yes" to one or more of the above questions, you ARE a priority development project and are therefore subject to Implementing structural Best Management Practices (BMP's) in addition to Implementing Standard Storm Water Requirements such as source control and low Impact development BMP's. A Storm Weter Management Plan (SWMP) must be submitted with your applicetion(s) for development Go to step 3 for redevelopment projects. For new projects, go to step 4 at the end of this questionnaire, check the "my project meets PDP requirements" box and complete applicant lnfonnatlon. If you answered "no· to ell of the above questions, you ARE NOT a priority development project and are therefore subject to ·mplementing only Standard Stonn Water Requirements such as source control and low impact development BMP'; required for all development projects. A Storm Water Management Plan (SWMP) Is not required with your application(s) for development Go to step 4 at the end of this questionnaire, check the "my project does not meet PDP requirements" box and complete applicant infonnation. E-34 The Grand Madison 725 Grand Avenue Page 2 of 3 Priority Development Project Storm Water Management Plan Effective 6/27/13 10 L ( City of rlsbad STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov II you a-ed ·no." tile 61ruc1Ural BMP'a required f0< Pr\omy Oevelopmenl Projecta apply to the enlke developmenl. Go to atep 4, check the •m ect meeta PDP ulrementa" box and com lata ■ licant Information. . .s:rEP4 CHECK THE APPROPRIATI: BOX AND COMPLETE APPLICANT INFORIIA110H tlll My project meets PRIORITY DEVELOPMENT PROJECT (PDP) requirements and must comply with eddltiooal stomlwater crttef1a per the SUSMP end I understand I must prepare a Storm Water Management Plan for eubmltlal et time of application, I understand flow control (hydromoclification) 19q1.1lremenls may apply ta my project. Refer to SUSMP for details. □ My project does not meet POP n,quilements and must ooy comply with STANDARD STORMWATER REQUIREMENTS per the SUSMP. As part of these requirements, I \I/Ill Incorporate low Impact development strategies throughout my projeCt. Applicant lnfoonatlon and Signature Box Address: 725 Grand Aveune Accessor'a Parcel Number(s): 203-303-21 This Box for City Use Only CltY Concurrence: By: Dale: Project ID: TVESTNO r T • Environmentally Sansttive Areas Include but are not limited to all Clean Wal.er Act Section 303(d) Impaired water bodies; areas designated as Areas of Special Biological Slgnfficance by the State Water Resources Cortrol Board (Water Quaity Control Plan lor the San Diego Basin (1994) and amendments): water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Baain (1994) and amendments): area, daslgnated as preserves or their quivelenl under the Multi Species Conservation Program within the CIUes and County of San Diego; and any other equivalenl environmentally sensitive areas which have been identified by the Copermtttees. E-34 The Grand Madison 725 Grand Avenue Page 3of 3 Priority Development Project Storm Water Management Plan Efledive 6/27/13 I 1 L 11.B HMP Applicability Determination Priority Development Projects (PDP) are required to implement hydromodification mitigation measures so that post-project runoff flow rates and durations do not exceed pre-project flow rates and durations where such increases would result in an increased potential for erosion or significant impacts to beneficial uses. Hydromodification refers to changes in the magnitude and frequency of stream flows as a result of urbanization and the resulting impacts on receiving channels in terms of erosion, sedimentation, and degradation of in-stream habitat. The degree to which a channel will erode is a function of the increase in driving force (shear stress), the resistance of the channel ( critical shear stress), the change in sediment delivery, and the geomorphic condition of the channel. Critical shear stress is the stress threshold above which erosion occurs. Not all flows cause erosion --only those that generate shear stress in excess of the critical shear stress of the bank and bed materials. Urbanization increases the shear stress exerted on the channel by stream flows and can trigger erosion in the form of incision (channel down cutting), widening (bank erosion), or both. Increases in flow below critical shear stress levels have little or no effect on the channel. In accordance with the Municipal Permit and final HMP, in addition to satisfying LID and treatment control (numeric) requirements, projects subject to PDP requirements might be required to implement measures so that post-development runoff rates and durations do not exceed pre-project conditions (hydromodification controls). This Project is a: PDP project Which increases the impervious area, Does not directly discharge to any of the exempt systems or lagoon area, Its stabilized conveyance system does directly discharge to exempt system, The stabilized conveyance system does have capacity for ultimate Q10, ls HMP Exempt. Note: This Project is in an area previously studied by the City of Carlsbad that has been found to be exempt from the hydromodification requirements of a Priority Development Project. So based on the Figure 2-1 of the City of Carlsbad SUSMP, revised January 14, 2011, this project is exempt from hydromodification control requirements. See the Figure 2-1 at next page. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 12 L 11.B HMP Applicability Determination (continued) SECTION 2: IDENT IFY POLLUTANTS, BMP SIZING AND SELECTION 110 NO HO FIGURE 2-1. HMP Applicability Determination* • refer to c.,-pandcd I-IMP c."-mption critL-ria bclo\\· for j1Lscilica1ion• re uired on L-:lCh nude The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 13 L Ill. Identification of Pollutants of Concern This SWMP identifies pollutants of concern in accordance with Section 2 of City of Carlsbad's Standard Urban Storm Water Mitigation Plan (SUSMP) dated January 14, 2011. In general urban runoff from a developed site has the potential to contribute pollutants, including oil and grease, suspended solids, metals, gasoline, pesticides, and pathogens to the storm water conveyance system and receiving waters. For the purposes of identifying pollutants of concern and associated storm water BMPs, pollutants are grouped in nine general pollutant categories; Sediments, Nutrients, Metals, Organic Compounds, Trash, Oxygen-Demanding Substances, Oil and Grease, Bacteria and Viruses, Pesticides. See the Section 2 of the City of Carlsbad SUSMP January 14, 2011 for definitions and details on each of these categories. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 14 L Ill.A Identification of Pollutants Generated by Land Use Type Table 2-1 of the City of Carlsbad SUSMP associates pollutants with the categories of Priority Development Projects; Project Categories Detached Residential □ Development Attached Residential [gJ Development [gJ Commercial Development □ Heavy Industry or Industrial Development The Grand Madison 725 Grand Avenue General Pollutant Categories Sediment Nutrients Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides Sediment Nutrients Trash & Debris Oxygen Demanding Substances (if landscape exists on-site) Oil & Grease (if uncovered parking areas exist on-site) Bacteria & Viruses Pesticides Sediment (if landscape exists on-site) Nutrients (if landscape exists on-site) Heavy Metals Organic Compounds (if uncovered parking areas exist on-site) Trash & Debris Oxygen Demanding Substances (includes solvents) Oil & Grease Bacteria & Viruses (if land use includes food or animal waste products) Pesticides (includes solvents) Sediment Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease Priority Development Project Storm Water Management Plan 15 L ID.A Identification of Pollutants Generated by Land Use Type (Continued) Project Categories □ Automotive Repair Shop ~ Restaurants □ Hillside Development ~ Parking Lots □ Retail Gasoline Outlets □ Streets, Highways & Freeways The Grand Madison 725 Grand Avenue General Pollutant Categories Heavy Metals Organic Compounds (includes petroleum hydrocarbons solvents) Trash & Debris Oil & Grease Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides (if landscape exists on-site) Sediments Nutrients Trash & Debris Oxygen Demanding Substances Oil & Grease Pesticides Sediments (iflandscape exists on-site) Nutrients (if landscape exists on-site) Heavy Metals Trash & Debris Oxygen Demanding Substances (if landscape exists on-site) Oil & Grease Pesticides (if landscape exists on-site) Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease Sediments Nutrients (if landscape exists on-site) Heavy Metals Organic Compounds (including petroleum hydrocarbons) Trash & Debris Oxygen Demanding Substances (includes solvents) Oil & Grease Bacteria & Viruses Pesticides (iflandscape exists on-site) Priority Development Project Storm Water Management Plan 16 L 111.B Project Hydrologic Location According to the Water Quality Control Plan for the San Diego Basin prepared by the San Diego Regional Water Quality Control Board, the receiving water for the proposed project is Buena Vista Lagoon located in El Saito Hydrologic Subarea (904.21), which is within Buena Vista Creek Hydrologic Area (904.20), part of the Carlsbad Hydrologic Unit (904.00). Hydrologic Unit □ Santa Margarita 902.00 □ San Luis Rey 903.00 ~ Carlsbad 904.00 The Grand Madison 725 Grand Avenue Hydrologic Area □ Ysidora 902.10 □ Lower San Lui s 903. I 0 □ Loma Alta 904.10 ~ Buena Vista Creek 904.20 □ Agua Hedionda 4.30 Priority Development Project Storm Water Management Plan Hydrologic Sub-Area □ Lower Y sidora 902 .11 □ Mission 903. ll □ Bonsall 903. 12 ~ El Saito 904.21 □ Vista 904.22 □ Los Monos 904.31 17 L 111.C Identification of 303(d) Impaired Receiving Waters This section is based on the Section 303(d) of2010 Clean Water Act List ofWater Quality Limited Segments Requiring TMDLS. At this time no further TMDL's have been established within Carlsbad. Receiving Water Buena Vista Lagoon ~ 90421000 (0.15 Miles) The Grand Madison 725 Grand Avenue Pollutant(s) Causing Impairment Indicator Bacteria Nutrients Sedimentation/Siltation Priority Development Project Storm Water Management Plan 18 L 111.D Beneficial uses of receiving water Beneficial Uses of Coastal Waters Beneficial Uses Hydrologic I N R R C B E w R M A M Inland Surface Waters Unit Basin N E E 0 I I A Q I Number D A C C M 0 s L R A u G V 1 2 M L T D E R A R Buena Vista Lagoon 904.21 X X X p X X X X Existing Beneficial Use; P Potential Beneficial Use Beneficial Uses of Ground Waters Beneficial Uses Hydrologic M A I p F G Ground Waters Unit Basin R R Number u G N 0 s w N R D C H R El Saito HSA * 904.21 X X p X Existing Beneficial Use; P Potential Beneficial Use * These beneficial uses do not apply westerly of the easterly boundary of the right-of-way of Interstate 5 and this area is exempted from the sources drinking water policy. The beneficial uses for remainder of the hydrologic area are as shown. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan s w s p A H w R L N M L X 19 L 111.E Identification of Primary Pollutants of Concern Any pollutants identified in Table 2-1 of the SUSMP, which are also causing impairment of the receiving waters, shall be considered primary pollutants of concern. Pollutants not identified as primary pollutants are categorized as secondary pollutants of concern. Ge......t ii'-c.._,.,.., l'x>oaq-f'coictt Hca,,y ~ ,.,___,__, 5edamt :-ia:llioms Una!! Detaollad l.e:idNml X l'. ~ Aa.:bal ~ X X ~ C -'".al ~ Jt1 . Pl l'. p;: >o..oasr H=yra.bmy X l'. X ~ l.'. r(4)(3; Lpaic S!l,ap, ~ Ki!l..t,, 0........,..... X X >:,J)(ICI 8l him&"loa ,,.. Pl X a-!Gmilllt X :i:. Oslt:lm ~ ~,k l:: Pflt l'. :lu'.4/ mt!lnJ"' Y=ld.cipdcd 'E=,._...;.1 (II AP,-.:put&D1.Claad,~au1:..--tit,,. I?./ A.pGl'!!llil!p:ill:tamli~p»jert~~pmicf El2.1. ~ Ap-.!..,.rl.um.iftud."""mn:lb-.food..,..-~~•,pmiam. \"l~i---~ (5;~octnat.. The Grand Madison 725 Grand Avenue l'ccb Oz:n-o Ii< D~ o.l Ii< Dmm Stlna...,., G.llO l'. X .i: X l'(I} 1"(2) X P,S. X l'. X l'. l( X X X i: X X l'. X PI X :i:. X l: X l'(j; l: Priority Development Project Storm Water Management Plan BaLUm. & v-l'H1>0ido1 X X l' Ji'. p·J, -P,J) X Pd X: P,1 X M ) 20 L IV. Source Control Measures Source Control BMPs are comprised of land use, site planning, structural or nonstructural measures which are intended to prevent the introduction of urban runoff pollution to the storm water conveyance system by reducing the potential for contamination at the source of pollution. Directly following is the source control measures specifically selected for this project. The full general list follows this specific one. Potential Sources of Runoff Pollutants On-site storm drain inlets Landscape/Outdoor Pesticide Use (For parts of landscaped area which will be disturbed due to installation the IMPs) The Grand Madison 725 Grand Avenue Permanent Controls Operational BMPs Mark all inlets with the words ''No Dumping! I Maintain and periodically repaint or replace inlet Flows to Bay" or similar. markings. 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 condition. (The appropriate plants for bioretention facility are herbaceous plants, shrubs and/_9r small trees) Provide Stormwater pollution prevention information to new site operators. See applicable operational BMPs in fact sheet SC-44, "Drainage System Maintenance", and SD-13 "Storm Drain Signage" in the CASQ Stormwater Quality Handbooks at www.cabmphandbooks.com A copy of these fact sheets is in the References Section of this report as well. Maintain landscaping using minimum or no pesticides. See applicable operational BMPs in Fact Sheet SC-41 , "Building and Ground Maintenance", in the CASQA Storm Water Quality Handbooks at www.cabmphandbooks.com A copy of these fact sheets is in the References Section of this report as well. Provide IPM information to new operators. Priority Development Project Storm Water Management Plan Consider using pre-resistant plants, especially adjacent to hardscape. To insure successful establishment, select plants appropriate to site soils, slopes, climate, sun, wind, and rain. Land Use, air movement, ecological consistency, and plant interactions. Fire Sprinkler Water Test I Provide means to drain Fire Sprinkler Test Water to Sanitary Sewer. Condensate Drain Lines Roofing, Gutters, and Trim Sidewalks The Grand Madison 725 Grand Avenue Condensate Drain Lines may discharge to landscaped areas if the flow is small enough that runoff will not occur. Condensate drain lines may not discharge to the storm drain system. Avoid roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff Priority Development Project Storm Water Management Plan See the note in Fact Sheet SC-41, "Building and Grounds Maintenance," in the CASQA Stormwater Quality Handbooks at www.£abmphandbooks.com Sidewalks shall be swept regularly to prevent the accumulation of litter and debris. Debris from pressure washing shall be collected to prevent entry into the storm drain system. Washwater containing any cleaning agent or degreaser shall be collected and discharged to the sanitary sewer and not discharged to a storm drain. V. Low Impact Development (LID) Project Design Strategies The LID Strategies for managing runoff from paving can provide multiple, complementary benefits to the project. Pervious surface reduce heat island effects and temperature extremes. Landscaping improves air quality, create a better place to live or work, and upgrades value for rental or sale. LID drainage design can also conserve water and reduce the need for drainage infrastructure. All the Integrated Management Practices (IMPs) are designed based on the Section 4 of City of Carlsbad SUSMP dated January 14,2011 . V.A. Optimization of Site Layout The site proposes removing all of the existing improvements and buildings on-site. There are no opportunities to preserve natural features as most all of the natural aspects of the site are long since removed. The general drainage pattern along with the storm water discharge location are maintained in the proposed development. V.B. Layout and use of permeable pavements or other pervious surfaces There are no proposed pervious paver areas for this project. V.C. Dispersal of runoff from impervious areas to pervious areas All roof and building surface runoff will be conveyed into a private storm drain system, prior to discharging into existing storm drain facilities in Grand Avenue and the curb and gutter in Madison Street. V.D. Drain Impervious Surfaces to Engineered TCBMP's or IMP's The stormwater generated on the proposed development will be captured and treated by flow through planter for water quality treatment. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 27 VI. Integrated Management Practices (Th1Ps) Integrated Management Practices (IMPs) will be utilized in this project to provide a long- term solution to water quality and flow control. VI.A. Selection process for Th1Ps targeting pollutants-of-concern The primary pollutants of concern for this project are sediments, nutrients, bacteria & viruses. This project proposes the use of flow through planters to mitigate the pollutants of concern to the maximum extent practicable. As described in Section I.D Opportunities and Constraints of this report, the IMPs/TCBMPs which would be proposed is dependent upon the soil type and available area for the treatment facility. For this project, flow through planters were chosen as the system best able to treat the runoff to the maximum extent practicable meet the Carlsbad SUSMP HMP requirements. VI.B. Sizing factors for Th1Ps The proposed flow through planters shall be sized for water quality treatment control only. The project is exempt from hydromodification. The sizing factor is the ratio of the design intensity of rainfall on tributary impervious surfaces (0.2 inches/hour) to the design percolation rate in the facility (5 inches/hour), or 0.04 (dimensionless). The minimum 0.04 sizing factor is the consistent countywide sizing factor for bioretention facilities when used for stormwater treatment only (i.e. not for flow control). The results for the required minimum TCBMP/IMP Areas for bioretention areas from Table 4-7 of the HMP are also included in this report. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 28 VI.C. Geotechnical recommendation on soil infiltration rates The design soil infiltration rate is 5 inches/hour, based on the sizing factor for stormwater treatment, from the City of Carlsbad SUSMP date 2011. VI.D. Infiltration calculation (drawdown time) for any self-retaining areas serving as an IMP No infiltration into soils are proposed for this project. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 29 IX. Documentation of Stormwater Design The stormwater classification for thjs project includes areas draining to IMPs and self- treating areas. IX.A. Drainage Management Areas The project site is comprised of (4) Drainage Management Area (DMA). The DMA is designed to address the treatment component of the mitigation plan consistent with the unified LID design approach. Summary of Project DMAs OMA Type Self-Treating Areas Self-Retaining Areas Areas That Drain to Self-Retaining Areas Areas That Drain to Integrated Management Practices (!MPs) Areas That Drain to Structural Treatment Control BMPs Areas That Drain to Proprietary Treatment Control BMPs Areas Not Feasible to Treat Total Number ofDMAs The Grand Madison 725 Grand Avenue Number or DMAs per Type 0 0 0 3 0 0 1 4 Priority Development Project Storm Water Management Plan 30 IX.B. Tabulations IX.B.1. Self-treating areas The self-treating areas are designated using methods described in Section 4 of the City SUSMP. The self-treating areas include no impervious area and slopes are gentle enough to ensure runoff will be absorbed into the vegetation and soil. Self-treating areas will drain off site. The locations and limits of all Areas Draining to IMPs are delineated on the DMA Exhibit. See DMNIMP Sizing Exhibit in the Attachments section of this report for detailed calculations. IX.B.2. Self-retaining areas NIA IX.B.3. Areas draining to self-retaining areas NIA IX.B.4. Areas draining to IMPslTCBMPs The IMPs are sized usi ng methods described in Section 4 of the City SUSMP. Areas draining to IMPs are multiplied by a sizing factor to calculate the required minimum size of the IMP. The identification ofDMA surface types and runoff factors are enumerated in the following Tabulation of Areas Draining to DMAs. The locations and limits of all Areas Draining to IMPs are delineated on the DMA Exhibit. See DMNIMP Sizing Exhibit in the Attachments section of this report for detailed calculations. IX.B.5. Sizing Calculations This project will use treatment control BMP sizing factors (Water Quality Treatment only) to size the required bioretention facilities. See the printouts on the previous page for the results. A minimum sizing factor of 0.04 for flow through planters will be used. See also OMA Sizing Exhibit in Attachments. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 31 X. BMP Facility Maintenance Requirements This section was prepared based on the Section 5 of the City of Carlsbad SUSMP. The goal is to ensure that the Project proponent (Patrick McGuire) accepts responsibility for all facility maintenance, repair, and replacement to maintain, repair, and replace facilities in perpetuity and comply with the City of Carlsbad staff conducted inspection findings, self-inspection, reporting, and verification requirements. Long-term maintenance of these facilities is intended to be conducted by a Home-owners Association to be determined (HOA TBD). Proper documentation and maintenance manuals will be submitted per City of Carlsbad requirements. X.A. Description of ownership and responsibility of maintenance The City of Carlsbad will enter into a Stormwater Facilities Maintenance Encroachment Agreement with access rights and covenants (SWFMA), with Patrick McGuire to maintain designated IMPs herein SWMP Report for the Project. The SWFMA will serve as the mechanism to ensure that proper inspection and maintenance is done in an efficient and timely manner. These IMPs are considered as private facilities which will be granted within an easement to maintain the facilities as part of the municipal storm drain system. Responsible Party Kevin Dunn GRAND MADISON, LLC 3005 S. El Camino Real San Clemente, CA 92672 GRAND MADISON, LLC shall maintain the facilities from the time they are constructed in perpetuity and comply with its own staff conducted inspection findings, self- inspection, reporting, and verification requirements. This can be done with hiring a management company as an agent and execution of an agreement to maintain the facilities as well as an annual inspection fee. Once a permanent Home-owner's Association is established, these responsibilities will be transferred. X.B. Summary of maintenance requirements for each stormwater facility Inspection and maintenance requirements of flow through planters, landscaping and irrigation system, and storm drain inlet marks will be done twice a year and after each storm. Inspection can be accomplished using the inspection and maintenance tables herein. Also, at the discretion of the Project proponent, a qualified stormwater company may be hired to perform the required inspection and maintenance and provide the necessary reports. See the Tables below for facilities inspection and maintenance requirements. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 32 Inspection and Maintenance Table . --- BMPType Field Measurement Flow Visual observation for sediment, trash Thro!!gh and debris accumulation. Planter Visual observation for vegetation health. Greater than 50% damaged vegetation. Visual observation of the drain time, standing water for more than 24 hours test with garden hose. Monitor and record the water level periodically to ensure proper drainage through the basin. 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.( See County of San Diego Vector Contro l home page: http://www.sdcounty.ca.gov/deh/pests/v ector disease.html. Areas of bare earth are exposed, mulch layer less than 3 inches. Visual observation for structural integrity: if there is any erosion, cracking, spalling, deterioration. The Grand Madison 725 Grand Avenue Inspection Frequency Twice per year. prior to October 15 (rainy season), during early dry season (April), and after each major storm event (0. 75 in). Priority Development Project Storm Water Management Plan Maintenance Indicator Maintenance Activity Sediment accumulation and Remove accumulated sediment, trash debris present at the bottom of and debris in the basin and dispose of basin ( specially at the inflow properly by vactor truck or equal. The points) by the bypass structure. sediment, debris, and trash removal shall take place when the basin is dry. Greater than 50% damage to Dispose of trash, debris, sediment and vegetation. Dead or diseased other waste materials shall be done at vegetation. suitable disposal/recycling sites and in compliance with all applicable local, Standing water for more than state, and federal waste regulations. 24 hours. Remove and replace all dead and Damaged inlet/outlet diseased vegetation, replace vegetation structures, erosion, cracking, with vegetation with similar growth spalling, and deterioration. requirements, treat vegetation using preventative and low-toxic measures to Toxic concentration of the extent possible. Reestablish in pollutants and low permeability accordance with the original of the soil reduced cation specification. Vegetation cover shalJ be exchange capacity of the soil. reestablished to the 85%. Abate any potential vectors by Confirm that no clogging will occur and filling holes in the ground in that the basin will drain within 24 and around the bioretention hours. Drain facility. Check over flow facility and by insuring that structure and unclog it. Check there are no areas where water permeability of the planting soil and if stands longer than 48 hours it is less than 5 inch per hour then folJowing a storm. If mosquito remove the top 2 lo 3 inches of the soil larvae are present and and replace it with a fresh soil mix. pe rsistent, BMPType Field Measurement Lab test shall be done for the soil PH( PH shall be between 5.5 to 6.5), and toxic concentration (Pollutants load). - The Grand Madison 725 Grand Avenue Ins1>ection Frequency Priority Development Project Storm Water Management Plan Maintenance Indicator Maintenance Activity Repair or replace any damaged or disconnected components. Prune and weed to maintain the bioretention area's appearance. Replenish mulch to 3 inches. Spot mulch when bare spots appear. The entire surface area of the bottom of the basin shall be remulched every 2 to 3 years. Mulch replacement shall be done prior to the start of the wet season. Generally soil may need to be replaced within 5-10 years of construction. $50.00each Annual Maintenance Cost "lJ -I ::.'!. :r 0 CO ;.., Gl '< ii! 0:, ~ a. ~ s: 0 W "C a. 3 iii" CO 0 :, :, ~ ;j Stormwater Pollutant Sources and Source Control Checklist How to Use this Checklist: 1. Review Column 1 and identify which of these potential sources of stormwater pollutants apply to your project. Check each box that appli es. 2. Review Column 2 and incorporate all o f the corresponding applicable BMPs in your SUSMP Drawings. 0 (Jl co·GJ 3 ~ ii! . Review Columns 3 and 4 and incorporate all of th e corresponding applicable permanent controls and operational BMPs in a table in your SUSMP Drawings. For PDP's, in your S\VMP, use the format shown in Table 3-1. In the SWMP, describe your specific BMPs in an accompanying narrative, and explain any special conditions or situations that required omitting BMPs o r substituting alternatives. (J) ;::, -a. 0 }> 3 < co :E :, W C -co ~ s: w :, w (0 (1) 3 co a?. "lJ fil" :, IF THESE SOURCES WILL BE ON THE PROJECT SITE ... 1 Potential Sources of Runoff Pollutants ~ A. On-site storm drain ~ inlets ... THEN YOUR PROJECT SHOULD INCLUDE THESE SOURCE CONTROL BMPs 2 3 4 Permanent Controls-Show on Permanent Controls-List in SWMP Operational BMPs-lnclude in SUSMP Drawings Table and Narrative SWMP Table and Narrative Locations of inlets. ~ Mark a ll inlets with the words "No ~ Maintain and periodically repaint or Dumping! Flows to Bay'' or similar. replace inlet markings. ~ Provide stormwatcr pollution prevention information to new site owners, lessees, or operators. ijf Sec applicable opcrat.ional BMPs in Fact Sheet SC-44, "Drainage System Maintenance," in the CASQA Stormwatcr Quality Handbooks at www.cabmphandbooks.com lii1' 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." Page 1 of 9 "Cl -l ~. ::r 0 (1) ~ G) '< ~ 0 Q) ~ 5. ~ s: 0 Q) "O C. 3 co· (1) 0 ::, ::, -__, "Cl IV ~ (J1 ~·G) n. iil (/) ::, -C. 0 )> 3 < (1) ~::, !!?. ffi ~ s: Q) ::, Q) '° (1) ~ a. "Cl OJ ::, □ □ □ ~ □ B. interior floor drains and elevator shaft sump pumps C. interior parking garages D1 . Need for future indoor & structural pest control D2. Landscape/ Outdoor Pesticide Use E. Pools, spas, ponds, decorative fountains, and other water features. □ □ □ □ Show locations of native trees or areas of shrubs and ground cover to be undisturbed and retained. □ □ Show self-retaining landscape areas, if any. {li If a PDP, sh ow stormwater ¥1' treatment facilities. ~ ~ ~ □ Show location of water feature and □ a sanitary sewer cleanout in an accessible area within 10 feet. State that interior floor drains and □ 1 nspect and maintain drains to elevator shaft sump pumps will be prevent blockages and overflow. plumbed to sanitary sewer. State that parking garage floor drains □ Inspect and maintain drains to will be plumbed to the sanitary sewer. prevent blockages and overflow. Note building design features that □ Provide Integrated Pest Management discourage entry of pests. information to owners, lessees, and operators. State that final landscape plans will ¥1' Maintain landscaping using accomplish all of the following. minimum or no pesticides. Preserve existing native trees, shrubs, ¥1' See applicable operational BMPs in and ground cover to the maximum Fact Sheet SC-41, "Buildjng and extent possible. Grounds Maintenance," in the CASQA Stormwater Quality Design landscaping to minimize Handbooks at irrigation and runoff, to promote www.cabmphandbooks.com surface infiltration where appropriate, and to minimize the use of fertilizers .a Provide JPM information to new and pesticides that can contribute to owners, lessees and operators. stormwater pollution. Where landscaped areas are used to retain or detain stormwater, specify plants that are tolerant of saturated soil conrutions. Consider using pest-resistant plants, especially adjacent to hardscape. To insure successful establishment, select plants appropriate to site soils, slopes, climate, sun, wind, rain, land use, air movement, ecological consistency, and plant interactions. Jf the local municipality requires pools □ See applicable operational BMPs in to be plumbed to the sanitary sewer, Fact Sheet SC-72, "Fountain and place a note on the plans and state in Pool Maintenance," in the CASQA the narrative that this connection will Stormwater Quality Handbooks at be made according to local www.cabmphandbooks.com requirements. Page 2 of9 ,:J --f ~. :::J"' 0 (1) ,¼ G> '< iil 0:, ~ a. ~ s: 0 Q) "O a. 3 ;;;· (1) 0 :, :, -...., ,:JN 0 u, mG> !2. iil en :, -a. 0 )> 3 < (1) ~:, 2!.~ ~ s: Q) :, "' (0 (1) ~ ~ ,:J ii, :, ~ F. Food service ~ ~ ~ G. Refuse areas ~ ~ .p □ H. [ ndus trial processes. □ For restaurants, g rocery stores, and other food service operations, show location (indoors or in a covered area outdoors) of a floor sink or o ther area for cleaning floor mats, containers, and equipment. On the drawing, show a note that this drain will be connected to a grease interceptor before discharging to the sanitary sewer. Show where site refuse and recycled materials will be handled and stored for pickup. Sec city standard drawing GS-16. If dumpsters or other receptacles are outdoors, show how the designated area will be covered, graded, and paved to prevent run- on and show locations of berms to prevent runoff from the area. Any drains from dumpsters, compactors, and tallow bin areas shall be connected to a grease removal device before discharge to sanitary sewer. Show process area. rt Describe the location and features of □ the designated cleaning area. r;f Describe the ite ms to be cleaned in this facility and how it has been sized to insure that the largest items can be accommodated. ti State how site refuse will b e handled .a State how the following will be and provide supporting detail to what implemented: is shown o n plans. Provide adequate number of ~ State that signs will be posted on or receptacles. J nspcct receptacles near dumpsters with the words "Do regularly; repair or re place leaky not dump hazardo us materials here" receptacles. Keep receptacles or similar. covered. Prohibit/prevent dumping of liquid or hazardous wastes. Post "no hazardous materials" signs. J nspcct and pick up litter daily and clean up spills immediately. Keep spill control materials available on- site. See Fact Sheet SC-34, "Waste Handling and Disposal" in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com □ If indus trial processes arc to be □ See Fact Sheet SC-10, "Non- located on site, state: "All process Stormwater Discharges" in the activities to be performed indoors. No CASQA Stormwater Q uality processes to drain to exterior or to H andbooks at storm drain system." www.cabmphandbooks.com Page 3 of9 -0 -I ~-=r 0 "' ;._. Gl '< iil 0:::, ~ a. ~ s: 0 I)) "'O a. 3 ;;;· "'0 :::, :::, -..... -0 N l~ ~ iil (/):::, -a. '; )> 3 < <l) ~:::, ~~ ~ s: I)) :::, I)) '° "' ~ ;:!. -0 ., :::, □ I. Outdoor storage of equipment or materials. (See rows J and K for source control measures for vehicle cleaning, repair, and maintenance.) □ Show any outdoor storage areas, including how materials will be covered. Show how areas will be graded and bermed to prevent run- on or run-off from area. □ Storage of non-hazardous liquids shall be covered by a roof and/ or drain to the sanitary sewer system, and be contained by berms, dikes, liners, or vaults. □ Storage of hazardous materials and wastes must be in compliance with the local hazardous materials ordinance and a Hazardous Materials Management Plan for the site. □ Include a detailed description of □ See the Fact Sheets SC-31, "Outdoor materials to be stored, storage areas, Liquid Container Storage" and SC- and structural features to prevent 33, "Outdoor Storage of Raw pollutants from entering storm drains. Materials " in the CASQA Stormwater Quality Handbooks at Where appropriate, reference www.cabmphandbooks.com documentation of compliance with the requirements of local Hazardous Materials Programs for: • Hazardous Waste Generation ■ Hazardous Materials Release Response and Inventory ■ California Accidental Release (CalARP) . Aboveground Storage Tank . Uniform Fire Code Article 80 Section 103(b) & (c) 1991 • Underground Storage Tank Page 1 of 9 cl -l 5·~ ~ Gl '< ii] 0:, ~ a. ~ s: 0"' -0 a. 3 <ii. <D 0 :, :, ---.J cl "' l~ ~ ii] (/) :, -a. g )> 3 < <D :E :, 2'.. ~ ~ s: "' :, "' co <D 3 <D ;?. cl iii° :, □ J. Vehicle and □ E quipment Cleaning Show on drawings as appropriate: (1) Commercial/industrial facilities having vehicle / equipment cleaning needs shall either provide a covered, bermed area for washing activities or discourage vehicle/ equipment washing b y removing hose bibs and installing signs prohibiting such uses. (2) Multi-dwelling complexes shall have a paved, bermed, and covered car wash area (unless car washing is prohibited on-site and hoses are provided with an automatic shut- off to discourage such use). (3) Washing areas for cars, vehicles, and equipment shall be paved, designed to prevent run-on to or runoff from the area, and plumbed to drain to the sanitary sewer. (4) Commercial car wash facilities shall be designed such that no runoff from the facility is discharged to the s torm drain system. Wastewater from the facility shall discharge to the sanitary sewer, or a wastewater reclamation system shall be installed. □ If a car wash area is not provided, Describe operational measures to describe measures taken to discourage implement the following (if on-site car washing and explain how applicable): these will be enforced. □ Washwater from vehicle and equipment washing operations s hall not be discharged to the storm drain system. □ Car dealerships and similar may rinse cars with water only. □ See Fact Sheet SC-21, "Vehicle and E quipment Cleaning," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com Page 5 of 9 -u -I ::!. =r 0 (1) :a, Gl '< iil 0:, ~ a. ~ s: 0 Q) -0 a. 3 .-;;· (1) 0 :, :, -.... -U IV ~-~ ~ iil (/) :, -a. ~ )> 3 < (1) ~:, o, C -(1) ~ s: Q) :, Q) co (1) 3 (1) ~ -u ii, :, □ K. Vehicle/Equipment □ Repair and Maintenance □ □ Accommodate all vehicle equipment repair and maintenance indoors. Or des ignate an outdoor work area and design the area to prevent run-on and runoff of stormwater. Show secondary containment for exterior work areas where motor oil, brake fluid, gasoline, diesel fuel, radiator fluid, acid-containing batteries or other hazardous materials or hazardous wastes are used or stored. Drains shall not be installed within the secondary containment areas. Add a note on the plans that states either (1) there are no floor drains, or (2) floor drains are connected to wastewater pretreatment systems prior to discharge to the sanitary sewer and an industrial waste discharge permit will be obtained □ State that no vehicle repair or In the SUSMP report, note that all of maintenance will be done outdoors, or the following res trictions apply to usc else describe the required features of the site: the outdoor work area. □ No person shall dispose of, nor □ State that there are no floor drains or if permit the disposal, directly or there are floor drains, note the agency indirectly of vehicle fluids, hazardous from which an industrial waste materials, or rinsewater from parts discharge permit wiU be obtained and cleaning into storm drains. that the design meets that agency's requirements. No vehicle fluid removal shall be performed outside a building, nor on □ State that there are no tanks, □ asphalt or ground surfaces, whether containers or sinks to be used for parts inside or outside a building, except cleaning or rinsing or, if there are, note in such a manner as to ensure that the agency from which an industrial any spilled fluid will be in an area of waste discharge permit wilJ be secondary containment. Leaking obtained and that the design meets vehicle fluids shall be contained or that agency's requirements. drained from the vehicle immediately. No person shall leave unattended drip parts or other open containers □ containing vehicle fluid, unless such containers are in use or in an area of secondary containment. Page 6 of 9 "O -I ~. =r-0 Cl> ~-G) '< ii! 0::, ~ a. ~;:: 0 0, "O a. 3 en Cl> 0 ::, ::, --..J "0 IV ~-~ ~ ii! (/)::, -a. Q ► 3 < ct) ~::, o, C -Cl> ~ ;:: 0, ::, 0, <O ct) g ~ "O w ::, □ L. Fuel Dispensing □ Fueling areas1 shall have □ The property owner shall dry sweep Areas impermeable floors (i.e., pordand the fueling area routinely. cement concrete or equivalent smooth impervious s urface) that □ See the Business Guide Sheet, are: a) g raded at the minimum "Automotive Service-Service s lope necessary to prevent ponding; Stations" in the CASQA Stormwater and b) separated from the rest of Quality Handbooks at the site by a grade break that www.cabm12handbooks.com prevents run-on of s tormwater to the maximum extent practicable. Fueling areas s hall be covered by a □ canopy that extends a minimum of ten feet in each direction from each pump. [Alternative: T he fueling area must be covered and the cover's minimum dimensions must be equal to or greater than the area within the grade break or fuel dispensing area 1.) The cano py [ or cover) shall not drain o nto the fueling area. 1 The fueling area shall be defined as the area extending a minimum of 6.5 feet from the com er of each fuel dispenser or the length at which the hose and nozzle assembly may be operated plus a minimum of one foot, whichever is greater. Page 7 of 9 1) --t ~. ::::J"' 0 (1) ~ G) -< iil 0::, (1) a. & s: 0 Q) u a. 3 '". (1) 0 ::, ::, --..J 1) Iv ~-~ Q.. al (/)::, -a. 0 )> 3 < (1) ~::, 2?. i ~ s: Q) ::, Q) <O (1) 3 (1) ,a. 1) iii ::, □ M. Loading Docks □ □ □ {Z( N. Fire Sprinkler Test Water Show a preliminary design for the □ Move loaded and unloaded items loading dock area, including indoors as soon as possible. roofing and drainage. Loading docks shall be covered and/ or □ See Fact Sheet SC-30, "Outdoor graded to minimize run-on to and Loading and Unloading," in the runoff from the loading area. Roof CASQA Stormwater Quality downspouts shall be positioned to Handbooks at direct stormwater away from the www.cabm12handbooks.com loading area. Water from loading dock areas should be drained to the sanitary sewer where feasible. Direct connections to storm drains from depressed loading docks are prohibited. Loading dock areas draining directly to the sanitary sewer shall be equipped with a spill control valve or equivalent device, which shall be kept closed during periods of operation. Provide a roof overhang over the loading area or install door skirts (cowling) at each bay that enclose the end of the trailer, r;t Provide a means to drain fire sprinkler id Sec the note in Fact Sheet SC-41, test water to the sanitary sewer. "Building and Grounds Maintenance," in the CASQA Stormwater Quality Handbooks at www.~abmphaodbooks.com Page 8 of 9 -cl -i ::,. ::r 0 (1) 2, G) '< iii :? ::, < Q. ~ s: 0 ., -0 Q. 3 ;;;· (1) 0 ::, ::, :;; j;j a U1 c5· G) u. iii en ::, -Q. 0 )> 3 < (1) ~::, !. ~ ~ s: ., ::, ., IC (1) ~ :a. -cl iii ::, □ ijf □ □ ~ ~ 0 . Miscellaneous Drain □ or Wash Water Boiler drain lines Condensate drain lines "' Rooftop equipment Drainage sumps Roofing, gutters, and trim. □ □ 0 P. Plazas, sidewalks, and parking lots. Boiler drain lines shall be directly or indfrectly connected to the sanitary sewer system and may not discharge to the storm drain system. Condensate drain lines may discharge to landscaped areas if the flow is s mall enough that runofTwilJ not occur. Condensate drain lines may not discharge to the storm drain system. Rooftop mounted equipment with potential to produce pollutants shalJ be roofed and/ or have secondary containment. Any drainage sumps on-site shall feature a sediment sump to reduce the quantity of sediment in pumped water. A void roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff. ii Plazas, sidewalks, and parking lots shall be swept regularly to prevent the accumulation of litter and debris. Debris from pressure washing shall be collected to prevent entry into the storm drain system. \Vashwater containing any cleaning agent or degreaser shall be collected and discharged to the sanitary sewer and not discharged to a storm drain. Page 9 of 9 XI. SWMP Certification Statements XI.A. Preparer's statement The selection, sizing, and design of stormwater treatment and other control measures in this Report meet the requirements of Regional Water Quality Control Board Order R-9-2007-0001 and subsequent amend ents. The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan Dat~ 35 XI.B. Owner's statement We hereby acknowledge that this project is subject to the stormwater quality regulations of the City of Carlsbad and certify that this project will provide satisfactory stormwater quality measures both during the construction process and afterwards. If this project is designated as a Priority or a Standard Project, we further acknowledge our understanding that the permanent stormwater treatment features must remain in place, be inspected at least once annually, and be maintained in good working order. Removal or modification of these features without prior City authorization is prohibited. We certify that we have reviewed the information contained in this form and verified that it is both complete and correct. f~ Owner Signature Kevin Dunn Printed Name of Owner The Grand Madison 725 Grand Avenue D Owner Signature Printed Name of Owner Priority Development Project Storm Water Management Plan Date 36 Attachments OMA/IMP Sizing Exhibit Single Sheet Post-Construction BMP Exhibit The Grand Madison 725 Grand Avenue Priority Development Project Storm Water Management Plan 37 IMP AREA CALCULATION FLOW THROUGH PLANTER FACILITY OMA OMA POST-PROJECT OMA OMA AREA X SOIL TYPE IMP NAME AREA SURFACE RUNOFF RUNOFF "D" I FLOW THROUGH PLANTER AT 4 TH FLOOR I IMP SIZING MAIN ROOF 8,277 ROOF 1.0 8,277 FACTOR PROPOSED FLOW THROUGH PLANTER 332 PLANTER 0.1 33 (WM ONLY) MINIMUM AREA AREA FOURTH FLOOR 8,300 0.04 I 332 I 332 I 1MP AREA I OMA2 "D" I FLOW THROUGH PLANTER AT 1ST FLOOR 2ND FLOOR ROOF & COMMON AREA 3,120 CONCRETE/ASPHALT/ROOF 1.0 3,120 IMP SIZING FACTOR FLOW THROUGH PLANTER 387 PLANTER 0.1 39 PROPOSED FIRST FLOOR (WM ONLY) MINIMUM AREA AREA 3,159 0.04 I 126 I 126 I 1MP AREA OMA3 -AREA NOT FEASIBLE TO TREAT ·o· I I CONCRETE/ASPHALT/ROOF 1,687 CONCRETE/ASPHALT/ROOF 1.0 1,687 IMP SIZING FACTOR PROPOSED (WM ONLY) MINIMUM AREA AREA 1,687 -I -I -I 1MP AREA I GRAND AVE. 0 w > <( z a U) D <( L . : : : : : : : : -: . . : . :-: ,: .............. . ?\-! )-)::::•:: :=:=:= :: :: :=:=:-···. ..... J'iliw +iiiw. :~iAtitrek: . : : . J;it,[J'i~T: f.t.99:F<i::: .... : : . ·. · ............. : ·_:-_::_=:_=:.-,-_-:_-_-,-::::.:.,. ·: ·>>>>>,:.-,::,=:,=:,:::=:,:_-,:_·,:.-,:.·=>= < < /:'":' ":'·":'--:--,::,::,::,:_·,:-;.-,:.-,:-,:_-,:::'::'::=-·,:-,=.·,=:,::,::,::,:.-,:_-,:_·,:_-_:_-::_-_:_-,:_: .. · ........ -:-..... : :-:-: ............ . LEGEND: DMA 1 -ROOF AREAS DRAINING TO 4TH FLOOR FLOE THROUGH PLANTER ----Vff/21/ /2½1 DMA 2 -2ND FLOOR AREAS DRAINING TO 1ST FLOOR FLOW THROUGH PLANTER ---ts88&&S888l DMA 3 -AREAS DRAINING TO ROW NOT FEASIBLE TO TREAT ---1 I BMP TABLE CASOA NO. QUANTITY DRAWING NO. SHEET NO.(S) INSPECTION * MAINTENANCE * BMPID# BMPTYPE SYMBOL FREQUENCY FREQUENCY TREATMENT CONTROL ([) FLOW THRU PLANTEf • MIN. 2 TIMES A MIN. 2 TIMES A 1STFLOOR TC-32 126 SF. 489-9A 5 OR AS NEEDED OR AS NEEDED SWMP NO. 15-25 © FLOW THRU PLANTEf • TC-32 489-9A 5 MIN. 2 TIMES A MIN. 2 TIMES A 4TH FLOOR 332 SF. OR AS NEEDED OR AS NEEDED PARTY RESPONSIBLE FOR MAINTENANCE: NAME GRAND MADISON, LLC CONTACT KEVIN DUNN ADDRESS 3005 S. El CAMINO REAL SAN CLEMENTE. CA 92672 HYDROMODIFICATION & TREATMENT CONTROL PHONENO. (949) 637-3254 PLAN PREPARED BY: N.A. HYDROMODIFICATION N.A. LOW IMPACT DESIGN (L.1.D.) ([)-([) ROOF DRAIN TO • SD-11 LANDSCAPING ([)-([) FLOWTHRU • TC-32 PLANTER SOURCE CONTROL 0 TRASH ENCLOSURE w SD-32 ([)-([) OPERATIONAL • SC-41 BMP'S 2EA. 489-9A 5 ANNUALLY ANNUALLY 2EA. 489-9A 5 MIN. 2 TIMES A MIN. 2 TIMES A OR AS NEEDED OR AS NEEDED 1 EA. 489-9A 5 2EA. 489-9A 5 NAME KAMAL S. SWEIS COMPANY K&S ENGINEERING, INC. ADDRESS 7801 MISSION CENTER CT. SUITE 100 SAN DIEGO CA. 92108 PHONENO. (619) 296-5565 BMPNOTES: SIGNATURE CERTIFICATION ____ _ 1. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S RECOMMENDATIONS OR THESE PLANS. 2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 3. NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 4. NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS PROJECT FOR APPROPRIATE BMP CONSTRUCTION AND INSTALLATION. 5. REFER TO MAINTENANCE AGREEMENT DOCUMENT. 6. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION. 10' 5' 0 w > <( z a U) D <( L GRAND AVE. - '~\ . - ' ~' -' ~ \ ~ ,- \ CONDO UNIT II CONDO UNIT 10 I CONDO UNIT 'I ' ~ 'tr"~ ' ~ ~ ~ ~ 0 ~~~ \\ ~ / n ' FLOJl'I THROUGH PLANTER ON 4TH FLOOR 8 / ~ "2 /4 ~ ~ ~ ~ \ F-- I D IX 11111 ('., ([), a ~~ .. ., '"·' ~ ;:.."'-'' -'-'" "'-, .. ,.,.,,'!., -::,~~ FLOY'! THROUGH PLANTERS LEGEND: TOP OF 24"X24" CATCH BASIN BMP 1 -FLOOR THROUGH PLANTER FOR ROOF {AT 4TH FLOOR) BMP 2 -FLOOR THROUGH PLANTER FOR 2ND FLOOR {AT FIRST FLOOR} EEP ROOTED, DENSE, DROUGHT TOLERANT PLANTING SUITABLE FOR WELL DRAINED SOIL LOT 1 --'y-----n~~~i---s· FREE BOARD FG 42" ,:1---4• PONDING .. --2• MULCH '1---18" ENGINEERED SOIL MIX* --3" OF PEA GRA l-£L ;ea---10" DEPTH OF 3/4" CRUSHED ROCK FOR STORAGE DMA/IMP SIZING ~ ~ ---·-~ . -- ----V,,1////1///2'.l -----tS>&"" s~ ~ -"7 ~ D l 0W IMPERMEABLE UNER THROUGHOUT BOT EXHIBIT THE GRAND MADISON o· 2~4" PERFORATED PVC PIPE *ENGINEERED SOIL MIX SHALL PROVIDE A MINIMUM SUSTAINED INFILTRATION RA TE OF 51/HR. MIX SHALL BE SANDY LOAM TOP SOIL CONSISTING OF 50% SAND, 30% PLANl/NG SOIL. 20% SHREDDED HARDWOOD MULCH. ~ K &_ S ENG_INE_ERING, l~C ~ Planning . Eng111eer1ng . Surveying 7801 Mission Center Court, Suite 100 San Diego, CA 92108 (619) 296-5565 Fax: (619) 296-5564 AMENDED ON 2/16/2018 fSHrn7 CITY OF CARLSBAD \SHEETS! 1---+----+----------------t---t---t----t----i ~ ENGINEERING DEPARTMENT 1 1-----1---+--------------+---t---lf---+---I SINGLE SHEET BMP SITE PLAN 725 GRAND AVENUE THE GRAND MADISON RECORD COPY PROJECT NO. 10· 20· 30' CT 15-04 SCALE: 1" = 1 O' DA TE INITIAL ENGINEER OF WORK REVISION DESCRIPTION DATE INITIAL DATE INITIAL O1HER APPROVAL CITY APPROVAL INITIAL DATE DRAWING NO. I 489-9A_