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Home My WebLink AboutSDP 2019-0015; JEFFERSON STREET APARTMENTS; PRELIMINARY STORM WATER QUALITY MANAGEMENT PLAN; 2020-11-12-... ... ... ... 111111 ... .. ... ... 111111 -... ... .. .. .. 1111111 .. 1111111 ... ... .. -... ... ... -... ... CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) PRELIMINARY STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR Jefferson Luxury Apartments ENGINEER OF WORK: Landmark Engineering Corporation 3443 Camino Del Rio South #204 San Diego, California 92108 Phone (619) 260-0420 c:zZ::::: Pee Lawrence E. Cole RCE 36292 exp. 6/30/2022 PREPARED FOR: Dr. Bruce Baker PRIVATE PROPERTIES, LLC P.O. Box 669 Poway, CA 9207 4 Phone: (858) 717-2929 Landmark Engineering Corporation 3443 Camino Del Rio South #204 San Diego, California 92108 Phone (619) 260-0420 DATE: November 12, 2020 DEC ro 2020 CIT\1 r,,;::-----I\.-,, C:Q t ,~ I -..._)' "-,·f\ ~\ '--"-..../ ,._.,1/-\,_) .:.~.:.. .. \,\ .. \C. .:::. -.:..,.~ ' . - 11111 - ... 11111 ... ... ... ... ... 11111 ... ... ... .. -- -... ... ... ... .. ... ... ... ... ... ... ... ... ... ... TABLE OF CONTENTS Certification Page Project Vicinity Map FORM E-34 Storm Water Standard Questionnaire Site Information FORM E-36 Standard Project Requirement Checklist Summary of PDP Structural BMPs Attachment 1: Backup for PDP Pollutant Control BMPs Attachment 1 a: OMA Exhibit Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment 1 c: Harvest and Use Feasibility Screening (when applicable) Attachment 1 d: Categorization of Infiltration Feasibility Condition (when applicable) Attachment 1 e: Pollutant Control BMP Design Worksheets I Calculations Attachment 2: Backup for PDP Hydromodification Control Measures Attachment 2a: Hydromodification Exemption Documentation Attachment 3: Structural BMP Maintenance Thresholds and Actions Attachment 4: Single Sheet BMP (SSBMP) Exhibit - ... .. ... -... ... .... 11111 .. ... .... .. ... .. -.. .. .. ... ... .. ... ... ... .. ... 1111 .. .. CERTIFICATION PAGE Project Name: Jefferson Luxury Apartments Project ID: I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order . I have read and understand that the City Engineer has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the plan check review of this SWQMP by the City Engineer is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design . ~-::::: !?~ Engin~'s Signature,RCE 36292, exp. 6/30/2022 Lawrence E. Cole Print Name Landmark Engineering Corporation Company September 14, 2020 Date ... ... ... ... ... ... ... ... .. ... .. ... .... .. .. .. ... -... ... ... ... -... ... ... .. .. ... ... ... ... ... ... PROJECT VICINITY MAP liOT TO SCA.LE lllli ... ... ... ... ... -.. ... ... ... .. ... ... .. ... ... -,.. .. .. .. ... .. ... ... -... ... ... ... ... [Insert City's Storm Water Standard Questionnaire (Form E-34) here] l_ City of Carlsbad I INSTRUCTIONS: STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov To address post-development pollutants that may be generated from development projects, the City requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMP's) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to 'PRIORITY DEVELOPMENT PROJECT' (PDP) requirements. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the City. If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted ti concurren Iy. PROJECT INFORMATION PROJECT NAME: Jefferson Luxury Apartments PROJECT ID: SOP 2019-0015 The project is (check one): □ New Development :Kl Redevelopment The total proposed disturbed area is: 13,977.8 ft2 ( 0.321 ) acres The total proposed newly created and/or replaced impervious area is: 131079.5 ft2 ( 0.300 ) acres If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the SWQMP # of the larger development project: Project ID: N/A SWQMP#: Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your aoolication to the City. E-34 Page 1 of 4 REV 02/16 . STEP 1 TO BE COMPLETED FOR ALL PROJECTS To determine if your project is a "development project", please answer the following question: YES NO Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing I I X building or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? If you answered "yes" to the above question, provide justification below then Go to step 5, mark the third box stating "my project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant information. Justification/discussion: (e.g. the project includes only interior remodels within an existing building): If you answered "no" to the above question, the project is a 'development project', go to Step 2. STEP2 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer the following questions: Is your project LIMITED to one or more of the following: YES NO 1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: a) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; X b) Designed and constructed to be hydraulically disconnected from paved streets or roads; c) Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed X in accordance with the USEPA Green Streets guidance? 3. Ground Mounted Solar Array that meets the criteria provided in section 1.4. 2 of the BMP manual? X If you answered "yes" to one or more of the above questions, provide discussion/justification below, then Go to step 5, mark the second box stating "my project is EXEMPT from PDP ... " and complete applicant information. Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered "no" to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page 2 of 4 REV. 02/16 i.' STEP3 TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)): YES NO 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, residential, mixed-use, X and public development projects on public or private land. 2. Is your project a redevelopment project creating and/or replacing 5,000 square feet or more of impervious surface collectively over the entire project site on an existing site of 10,000 square feet or X more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. 3. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a restaurant? A restaurant X is a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). 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 X development project includes development on any natural slope that is twenty-five percent or greater. 5. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a parking lot? A parking lot X is a land area or facility for the temporary parking or storage of motor vehicles used personally for business or for commerce. 6. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a street, road, highway X freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles. 7. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more of impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance X of 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from the project to the ESA (i.e. not commingled with flows from adjacent lands).* 8. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface that supports an automotive repair shop? An automotive X 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 or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category X includes RGO's that meet the following criteria : (a) 5,000 square feet or more or (b) a project Average Daily Traffic (ADT) of 100 or more vehicles per day. 10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of X land and are expected to generate pollutants post construction? 11 . Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC X 21 .203.040) If you answered "yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment project, Go to step 4. If your project is a new project, Go to step 5, check the first box stating "My project is a PDP ... " and complete applicant information. If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT', "Go to step 5, check the second box stating "My project is a 'STANDARD PROJECT' ... " and complete aoolicant information. E-34 Page 3 of 4 REV. 02/16 STEP4 TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP) ONLY Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)): YES NO Does the redevelopment project result in the creation or replacement of impervious surface in an amount X of less than 50% of the surface area of the previously existing development? Complete the percent impervious calculation below: Existing impervious area (A) = 12507.4 sq. ft. Total proposed newly created or replaced impervious area (B) = 13079.5 sq. ft. Percent impervious area created or replaced (B/A)*100 = 104.6 % If you answered "yes", the structural BMP's required for PDP apply only to the creation or replacement of impervious surface and not the entire development. Go to step 5, check the first box stating "My project is a PDP ... " and complete applicant information. If you answered "no," the structural BM P's required for PDP apply to the entire development. Go to step 5, check the check the first box stating "My project is a PDP ... " and complete applicant information. SlEP5 CHECK THE APPROPRIATE BOX ANll COMPLETE APPLICANT INFORMATION El My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP) for submittal at time of application. 0 My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT' stormwater re quirements of the BMP Manual. As part of these requirements, I will submit a "Standard Project Requirement Checklist Form E-36" and incorporate low impact development strategies throughout my project. Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations and exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply. 0 My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual. Applicant Information and Signature Box Assessor's Parcel Number(s): 203-351-22-00 Applicant Name: Lawrence E. Cole Applicant Title: Project Civil Engineer Applicant Signature:~ p~ Date: September 04, 2020 ~ * Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1 994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City. This Box for City Use Only City Concurrence: I YES I NO I I By: Date: Project ID: E-34 Page 4 of 4 REV. 02/16 SITE INFORMATION CHECKLIST . ,. Project Summary lnformatjon ·-. ,_ . - Project Name Jefferson Luxury Apartments Project ID Project Address 3039 Jefferson Street Carlsbad, California 92008 Assessor's Parcel Number(s) (APN(s)) 203-351-22-00 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 0.321 ( 13977.826 Acres Sauare Feet) Existing Impervious Area 0.287 Acres ( 12507.408 Square Feet) (subset of Parcel Area) Area to be disturbed by the project (Project Area) 0.321 Acres ( 13977.826 Square Feet) Project Proposed Impervious Area 0.300 Acres ( 13079.53 Square Feet) (subset of Project Area) Project Proposed Pervious Area 0.021 Acres ( 898.30 Square Feet) (subset of Project Area) Note: Proposed Impervious Area+ Proposed Pervious Area= Area to be Disturbed by the Project. This may be less than the Parcel Area. Description of Existing Site Condition and Drainage Patterns ' .. Current Status of the Site (select all that apply): :E:Existing development □ Previously graded but not built out □ Agricultural or other non-impervious use □ Vacant, undevebped/natural Description/ Additional lrtormation: Existing Land Cover Includes (select all that apply): :E:Vegetative Cover □ Non-Vegetated Pervious Areas :E:lmpervious Areas Description/ Additional lrtormation: Underlying Soil belongs to Hydrologic Soil Group (select all that apply): ONRCS Type A ~NRCS Type B D NRCS Type C D NRCS Type D Approximate Depth to Groundwater (GW): D GW Depth < 5 feet □ 5 feet < GW Depth < 1 O feet :E: 1 O feet < GW Depth < 20 feet D GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): □ Watercourses □ Seeps D Springs □Wetlands ~None Description/ Additional Information: ... --.. ... .. ... .. -.. ... .. ... .. ... .. ... ... ... .. ... .. .. ... .. ... ... ... ... ... .. ... .. ... .. .. .. Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site? At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: The existing project site drainage area is approximately 0.486 acres. The site varies in elevation from a high of 47.95 through the property to a low of 46.44 at the southwest gutter of Jefferson Street and from a high of 47.95 through the property to a low of 45.17 at the southeast alley swale . The storm water runoff is urban, there are no natural drainage features on the site. There are no existing constructed storm water conveyance systems on the site. All drainage is directed to public street and alley . There is no offsite runoff conveyed through the site . ... .. .. .. ... .. ... ... .. ... ... .. .. ... .. ... .. -... -.. ... .. .. ... Ill .. .. .. .. ... ... .. .. .. D•s~ribti~fi,of Pr(), ,. :• Site. 8ev.•loi,1nij~t and Drainaae Patterns Project Description / Proposed Land Use and/or Activities: The lower retail (commercial) floor plans are 1,100 sfand 1,085 sf with 14 ft. high ceilings. The 17 residential units comprise of a total of 18,259 sf of floor area and a 3,624 sf of deck area . The project consists of 17 unit's, with 6 units on the second floor, 6 units on the third floor and 5 units on the fourth floor. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): The impervious features of the proposed site consist of roofs, balconies, staircases and concrete walkways providing access to the site . List/describe proposed pervious features of the project (e.g., landscape areas): The project proposes one Biofiltration BMP which provides treatment of stormwater runoff before it exits the site. Two sidewalk level landscape areas are proposed at front along Jefferson Street . Does the project include grading and changes to site topography? )(Yes □No Description / Additional Information: The proposed first floor parking, demolision of existing structures and building costruction involves significant grading of the existing site. Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? )(Yes □No Description/ Additional Information: The site proposes to drain to Biofiltration Basin #1. From there it will be carried with other stormwater into the Alley and away from site. Also the site proposes to drain to Biofiltration Basins #2 and Biofiltation Basin #3 on the 2nd floor. From there the storm-water is carried into the gutter of Jefferson Street and away from site as described in the Hydrology Study. Source Control of the proposed elevator shaft and nuisance water that might occur within the parking garage will be carried to a private catch basin which will be pumped to discharge into the sanitary sewer system . -... ---.. -.. -.. -... ---... -... -.. ... --.. -.. -.. ... ... ... .. ... ... ... -... - Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply): □ On-site storm drain inlets )(Interior floor drains and elevator shaft sump pumps )(Interior parking garages ~Need for future indoor & structural pest control )(Landscape/Outdoor Pesticide Use □ Pools, spas, ponds, decorative fountains, and other water features □Foodservice □ Refuse areas □ Industrial processes □ Outdoor storage of equipment or materials □ Vehicle and Equipment Cleaning □ Vehicle/Equipment Repair and Maintenanre □ Fuel Dispensing Areas □ Loading Docks □ Fire Sprinkler Test Water □ Miscellaneous Drain or Wash Water □ Plazas, sidewalks, and par1<ing lots Completed Source Control BMP Design Fact Sheets are inserted after this page. 1 Potential Sources of Runoff Potlutants Jii:l A. Onsite storm drain inlets □ Not Applicable 2 Permanent Controls-Show on Drawings ):iit Locations of inlets. 3 Permanent Controls-List in Table and Narrative ca Mark all inlets with the words "No Dumping! Flows to Bay" or similar. E-3 Appendix E : BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative Ii: Maintain and periodically repaint or replace inlet markings. ca Provide storm water pollution prevention information to new site owners, lessees, or operators. Ci( See applicable operational BMPs in Fact Sheet SC-44, "Drainage System Maintenance," in the CASQA Stormwatet Quality Handbooks at www.cabmphandbooks.com. ll! Include the following in lease agreements: "Tenant shall not allow anyone to djscharge anything to storm drains or to store or deposjt materials so as to create a potential discharge to storm drains.'' February 2016 Appendix E: BMP Design Fact Sheets ~~¢;~~:i: .-. -.. -rir:~--:-;~ .... --t.,_-,-.;~,--:~~ ~\f[lf~sc., §~1~rc,~~\~~JJJk. ![ _ . " -·- ._._.. -------.. _ ~ ---. -~ -----· -----........ ~~-· . -: , '·on the;P1·01ect·S11e· ... ~~ ~ ~· · , :_ ' • ,· .;.._.t,; -r~7'-:_)~ . . .. ThcnYoi1r Proj1.·ct sh nil consider These Source Control 81\f Ps :~.~.: ·-. ~:.. X L-.£.~. ::__ _.;~~~ ~~ 1 Potential Sources of Runoff Pollutants l:11 B. Interior floor drains and elevator shaft sump pumps □ Not Aeelicable ~ C. Interior parking garages □ Not Applicable ~ D1. Need for future indoor & stnictura1 pest control 2 Permanent Controls-Show on Drawings 3 Permanent Controls-List in Table and Narrative ~ State that interior floo r drains and elevator shaft sump pumps will be plumbed to sanitary sewer. ~ State that parking garage floor drains wiJJ be plumbed to the sanitary sewer or an approved BMP ~ Note building design features that discourage entry of pests. E-4 4 Operational BMPs-Include in Table and Narrative ~ Inspect and maintain drains to prevent blockages and overflow. ~ Inspect and maintain drains to prevent blockages and overflow. ~ Provide Integrated Pest Management information to owners, lessees, and operators. February 2016 1 Potential Sources of Runoff Pollutants :t& D2. Landscape/ Outdoor Pesticide Use 0 Not Applicable 2 Permanent Controls-Show on Drawings M ~ ~ Show locations of existing trees or areas of shrubs and ground cover to be undisturbed and retained. Show self-retaining landscape areas, if any. Show storm water treatment facilities. 3 Permanent Controls-List in Table and Narrative State that final landscape plans will accomplish all of the following. 0 Preserve existing drought tolerant trees, shrubs, and ground cover to the maximum extent possible. I Jg( Design landscaping to mmmuze irrigation and runoff, to promote surface infiltration where appropriate, and to minimize the use of fertilizers and pesticides that can contribute to storm water pollution. Jg( \Xihcrc landscaped areas are used to retain or detain storm water, specify plants that arc tolerant of periodic saturated soil conditions. :t& Consider using pest-resistant plants, especially adjacent to hardscape. l!!l To ensure successful establishment, select plants appropriate to site soils, slopes, climate, sun, wind, rain, land use, air movement, ecological consistency, and plant interactions. E-5 Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative M Maintain landscaping using minimum or no pesticides. ~ See applicable operational BMPs in Fact Sheet SC-41, "Building and Grounds Maintenance," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. lll Provide IPM information to new owners, lessees and operators. February 2016 1 Potential Sources of Runoff Pollutants □ E. Pools, spas, ponds, decorative fountains, and other water features. :81 Not /\pplicable □ F. Food service ~ Not Applkablc Appendix E: BMP Design Fact Sheets 0 2 Permanent Controls-Show on Drawings Show location of water feature and a sanitary sewer cleanout in an accessible area within 10 feet. 3 Permanent Controls-List in Table and Narrative D Pool backwash to be plumbed to the sanita1y sewer. Place a note on the plans and state in the narrative that this connection \\rill be made according to city requirements. 0 For restaurants, grocery stores, I 0 Describe the location and features of the designated cleaning area. and other food service operations, show location I 0 (indoors or in a covered area outdoors) of a floor sink or other area for cleaning floor mats, containers, and equipment. □ On the drawing, show a note that this drain will be connected to a grease in terceptor before discharging to the sanitary sewer. D escribe the items to be cleaned in this facility and how it has been sized to ensure that the largest items can be accommodated. E-6 4 Operational BMPs-lnclude in Table and Narrative □ See applicable operational BiYfPs in Fact Sheet SC-72, "Fountain and Pool Maintenance," in the CASQA Stormwater Quality Handbooks at wv.tw.cabmphaodbooks.com. February 2016 1 Potential Sources of Runoff Pollutants 0 G. Refuse areas M Not Applicable 2 Permanent Controls-Show on Drawings 0 Show where site refuse and recycled materials will be handled and stored for pickup. 0 If dumpsters or other receptacles arc 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. Also show how the designated area will be protected from \vind dispersal. 0 Ani drains from dumpsters, compactors, and tallow bin areas shall be discharged to an approved Bi\{P. 0 Refer to City Standard Drawing GS-16 for details. 3 Permanent Controls-List in Table and Narrative D State how site refuse \\rill be handled and provide supporting detail to what is shown on plans. D State that signs will be posted on or near dumpsters with the words "Do not dump hazardous materials here" or similar. E-7 Appendix E: BMP Design Fact Sheets 4 Operational BMPs-lnclude in Table and Narrative D State how the following will be implemented: Provide adequate number of receptacles. Inspect receptacles regularly; repair or replace leaky receptacles. Keep receptacles covered. Prohibit/ prevent dumping of liquid or hazardous wastes. Post "no hazardous materials" signs. Inspect and pick up li tter daily and clean up spills immediately. Keep spill control materials available on -si te. See Fact Sheet SC-34, "Waste Handling and Disposal" in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. February 2016 1 Potential Sources of Runoff Pollutants DH. Industrial processes. l!!i Not Applicable 0 I. Outdoor storage of equipment or materials. (Sec rows J and K for source control vchjcle measures for cleaning, and repafr, maintenance.) 18( Not Applicable 2 Permanent Controls-Show on Drawings 0 0 0 Show process area. Show any outdoor storage areas, including how materials will be covered. Show how areas will be graded and bermed to prevent run-on or runoff from area and protected from wind dispersal. 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. 0 Storage of hazardous materials and wastes must be in compliance with the city's hazardous materials ordinance and a Hazardous Materials Management Plan for the site. Appendix E: BMP Design Fact Sheets 3 Permanent Controls-List in Table and Narrative 0 If industrial processes are to be located onsite, state: "All process activities to be perfom,ed indoors. No processes to drain to exterior or to storm drain system." 0 Include a detailed description of materials to be stored, storage areas, and structural features to prevent pollutants from entering storm drains. Where appropriate, reference documentation of compliance with the requirements of local Hazardous Materials Programs for: • Hazardous Waste Generation • Hazardous Materials Release Response and Inventory • Califorru::i Accidental Release Prevention Program • Aboveground Storage Tank • Unifom, Fire Code Article 80 Section 1030J) & (c) 1991 • Underground Storage Tank E-8 4 Operational BMPs-lnclude in Table and Narrative Table and Narrative 0 See Fact Sheet SC-10, "Non- Stormwater Discharges" in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. 0 See the Fact Sheets SC-31, "Outdoor Liquid Container Storage" and SC-33, "Outdoor Storage of Raw Materials" in the CASQA Stormwatcr Quality Handbooks at www.cabmphandbooks.com. February 2016 1 Potential Sources of Runoff Pollutants □ J. Vehicle and Equipment Cleaning l!I Not Applicable 2 Permanent Controls-Show on Drawings □ 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 by removing hose bibs and installing signs prohibiting such uses. (2) Commercial car wash facilities shall be designed such that no runoff from the facility is discharged to the storm drain system. Wastewater from the facility shall discharge to the sanitary sewer, or a wastewater reclamation system shall be installed. E-9 3 Permanent Controls-List in T able and Narrative □ lf a car wash area is not provided, describe measures taken to discourage onsite car washing and explain how these will be enforced. Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative D escribe operational measures to implement the following (if applicable): □ Washwater from vehicle and equipment washing operations shall 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 ~uipmcnt Cleaning," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com February 2016 1 P otential Sources of Runoff P ollutants 0 K. Vehiclc/E9uipment Repair and Maintenance ):g Not Applicable 0 0 0 2 Permanent Controls-Show on Drawings Accommodate all vehicle e9uipment reprur and maintenance indoors or designate an outdoor work area and design the area to protect from rainfall, run-on runoff, and wind dispersal. 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 with.in the secondarr 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. 3 Permanent Controls-List in Table and Narrative 0 0 0 State that no vehicle repair or maintenance will be done outdoors, or else describe the required features of the outdoor work area. State that there are no fl oor drains or if there are floor drains, note the city from which an industrial waste discharge permit ·will be obtained and that the design meets city's re9uirements. State that there arc no tanks, containers or sinks to be used for parts cleaning or rinsing or, if there are, note the city from which an industrial waste discharge permit will be obtained and that the design meets city's requirements. E-10 Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative In the report, note that all of the fo!Jowing restrictions apply to use the site: 0 No person shall dispose of, nor permit the disposal, directly or indirectly of vehicle fluids, hazardous materials, o r rinsewater from parts cleaning into storm drains. 0 0 No vehicle fluid removal shall be performed outside a bL1ilding, nor on asphalt or ground surfaces, whether inside or outside a building, except in such a manner as to ensure that any spilled fluid will be in an area of secondary containment. Leaking vehicle fluids shall be contained or 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. February 2016 1 Potential Sources of Runoff Pollutants 0 L. Fuel Dispensing Areas l8f Not Applicable 2 Permanent Controls-Show on Drawings 0 Fueling areas1 shall have impermeable floors (i.e., portland cement concrete or equivalent smooth impervious surface) that arc (1) graded at the minimum slope necessary to prevent ponding; and (2) separated from the rest of the site by a grade b reak that prevents run-on of storm water to the MEP. 0 Fueling areas shall be covered by a cano py that extends a minimum o f ten feet in each djrection from each pump. !Alternative: The fueling area must be covered and the cover's mirumum dimensions must be equal to or greater than tl,e area witrun the grade break or fuel dispensing area 1.] The canopy [o r cover] shall not drrun onto the fueling area. 3 Permanent Controls-List in T able and Narrative Appendix E: BMP D esign Fact Sheets 4 Operational BMPs-Include in Table and N arrative 0 The property owner shall dty sweep the fueling area routinely. 0 Sec tl,c Business Guide Sheet, "Automotive Service-Service Stations" in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. 1. The fueling area shall be defined as the area extendjng a mirumum of 6.5 feet from the corner of each fuel djspenser or the length at which the hose and nozzle assembly may be operated plus a mmm,um of one foot, whichever is greater. E -11 February 2016 1 Potential Sources of Runoff P ollutants M. Loading D ocks )8( Not Applicable 2 Permanent Controls-Show on Drawings 0 Show a preliminary design for the loading dock area, including roofing and drainage. Loading docks shall be covered and/ or graded to minimize run-on to and runoff from the loading area. Roof downspouts shall be positioned to direct storm water away from the loading area. Water from loading dock areas should be drained to an approved B:MP. D irect connections to storm drains from depressed loading docks are prohibited. □ Loading dock shall be equipped with a spill control valve or equivalent device, which shall be kept closed during periods of operation. 0 Provide a roof overhang over tbe loading area or install door skirts (cowling) at each bay that enclose the end o f the trailer. 3 Permanent Controls-List in Table and Narrative E -12 Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative □ Move loaded and unloaded items indoors as soon as possible. 0 Sec Fact Sheet SC-30, "Outdoor Loading and Unloading," in the CASQA Stormwatcr Quality Handbooks at ·www.cabmphandbooks.com. February 2016 1 Potential So urces of Runoff Pollutants ~ N. Fire Sprinkler Test Water D :--.:ot Applicable 0. Miscellaneous Drain or Wash \,'\later □ Boiler drain lines □ Condensate drain lines □ Rooftop equipment □ Drainage sumps El Roofing, gutters, and trim □ Nm Applicable 2 Permanent Controls- Show on Drawings Appendix E: BMP Design Fact Sheets :81 3 Permanent Controls-List in Table and Narrative Provide a means to drain fire sprinkler test water to the sanitary sewer or approved BMP. □ Boiler drain lines shall be directly or indirectly connected to the sanitary sewer system and may not discharge to the storm drain system. D Condensate drain lines may discharge to landscaped areas if the flow is small eno ugh that runoff will not occur. Condensate drain lines may not discharge to the storm d rain system. □ Rooftop mounted equipment with potential to produce pollutants shall be roofed and/or have secondary containment. D Any drainage sumps onsite shall feature a sediment sump to reduce the quantity of sediment in pumped water. :81 Avoid roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff. E-13 4 Operational BMPs-lnclude in Table and Narrative ll:!t See the note in Fact Sheet SC- 41, "Building and Grounds Maintenance," in the CASQA Stormwater Quality Handbooks at wv,.rw.cabmphandbooks.com. February 2016 1 Potential Sources of Runoff Pollutants □ P. Plazas, sidewalks, and parking lots. M Not Applicable 2 Permanent Controls-Show on Drawings 3 Permanent Controls-List in Table and Narrative E-14 Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative □ Plazas, sidewalks, and parking lots shall be swept regularly to prevent the accumulation of litter and debris. Debris &om 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. February 2016 Identification of Receiving Water Pollutants of Concern Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): The runoff flows southerly to the northwesterly gutter of Oak Avenue the surface flow southwesterly along Oak Avenue through a series of cross gutters toward the Pacific Ocean. List any 303(d) impaired water bodies within the path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water bodies: 303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs None Identification of Project Site Pollutants Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see BMP Desiqn Manual ,Apoendix 8.6): Pollutant Sediment Nutrients Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides X = Anticipated P = Potential Not Applicable to the Project Site X X Also a Receiving Anticipated from the Water Pollutant of Project Site Concern X X X p X p X Hydromodification Manaaement Requir:ements Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? o Yes, hydromodification management flow control structural BMPs required. o No, the project will discharge runoff directly to existing underground storm drains discharging directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. )(No, the project will discharge runoff directly to conveyance channels whose bed and bank are concrete-lined all the way from the point of discharge to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. To the Pacific Ocean. □ No, the project will discharge runoff directly to an area identified as appropriate for an exemption by the WMAA for the watershed in which the project resides. Description/ Additional Information (to be provided if a 'No' answer has been selected above): Critical Coarse Sediment Yield Areas* *This Section only required if hvdromodification manaaement requirements apply Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas exist within the project drainage boundaries? □Yes )(No, No critical coarse sediment yield areas to be protected based on WMAA maps If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed? o 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite o 6.2.2 Downstream Systems Sensitivity to Coarse Sediment D 6.2.3 Optional Additional Ana~sis of Potential Criti cal Coarse Sediment Yield Areas Onsite o No optional analyses performed, the project will avoid critical coarse sediment yield areas identified based on WMAA maps If optional analyses were performed, what is the final result? □ No critical coarse sediment yield areas to be protected based on verification of GLUs onsite o Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. □ Critical coarse sediment yield areas exist and require protection. The project will implement management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion/ Additional Information: Flow Control for Post-Project Runotr *This Section onlv reauired if hvdromodification manaaement reauirements aoolv List and describe point(s) of compliance (POCs) for flow control for hydromodification management (see Section 6.3.1 ). For each POC, provide a POC identification name or number correlating to the project's HMP Exhibit and a receiving channel idertification name or number correlating to the project's HMP Exhibit. The site is exempt from Hydromodification Management requirements (See attached documention), therefore preparation of a Hydromodification Management Exhibit and the checklist above is NOT APPLICABLE. Has a geomorphic assessment been performed for the receiving channel(s)? D No, the low flow threshold is 0.1 Q2 (default low flow threshold) D Yes, the result is the low flow threshold is 0.1 Q2 D Yes, the result is the low flow threshold is 0.3Q2 D Yes, the result is the low flow threshold is 0.5Q2 If a geomorphic assessment has been performed, provide title, date, and preparer. Discussion/ Additional Information: (optional) Other Site Requirements and Constraints When applicable, list other site requirements or constraints that will influence storm water management design, such as zoning requirements including setbacks and open space, or City codes governing minimum street width, sidewalk construction, allowable i:avement types, and drainage requirements. Not Applicable Optional Additional Information or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. -... -... ,.. .. ,.. ... -.. ,.. ... -... ,.. ... -... .. ... ,.. ... ... ... -.. ,.. ... ,,. .... -~ [Insert City's Standard Project Requirement Checklist Form E-36 (here)] ( City of Carlsbad STANDARD PROJECT REQUIREMENT CHECKLIST E-36 ,. ·-~roject lnfonnation Project Name: Jefferson Luxury Apartments Project ID: DWG No. or Building Permit No.: --Source Control BMPs - Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov -,· All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and Appendix E.1 of the BM P Design Manual for information to implement source control BM Ps shown in this checklist. Answer each category below pursuant to the following. • "Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the Model BMP Design Manual. Discussion/justification is not required. • "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. • "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be provided. Source Control Requirement Applied? SC-1 Prevention of Illicit Discharges into the MS4 '21 Yes I 0 No 0 NIA Discussion/justification if SC-1 not implemented: SC-2 Storm Drain Stenciling or Signage D Yes l '2] No 0 N/A Discussion/justification if SC-2 not implemented: There are no storm drain inlets in the immediate vicinity of the project and no stenciling or signage requirements would be needed. SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind '21 Yes I D No 0 N/A Dispersal Discussion/justification if SC-3 not implemented: E-36 Page 1 of 4 Revised 03/16 Source Control Reauirement (continued) Annlied? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and □Yes j □ No I 0 N/A Wind Dispersal Discussion/justification if SC-4 not implemented: SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal □ Yes j 0 No I 0 NIA Discussion/justification if SC-5 not implemented: SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and identify additional BMPs. (See Table in Annendix E.1 of BMP Manual for guidance). 0 On-site storm drain inlets □ Yes 0 No 0 N/A 0 Interior floor drains and elevator shaft sump pumps 0 Yes 0 No 0 N/A 0 Interior parking garages 0 Yes 0 No 0 N/A 0 Need for future indoor & structural pest control 0 Yes 0 No 0 N/A 0 Landscape/Outdoor Pesticide Use 0 Yes 0 No 0 N/A 0 Pools, spas, ponds, decorative fountains, and other water features □ Yes 0 No 0 N/A 0 Food service □ Yes 0 No 0 NIA 0 Refuse areas 0 Yes 0 No 0 N/A 0 Industrial processes □Yes 0 No 0 N/A 0 Outdoor storage of equipment or materials 0 Yes D No D N/A 0 Vehicle and Equipment Cleaning □ Yes 0 No 0 N/A 0 Vehicle/Equipment Repair and Maintenance □ Yes 0 No 0 N/A 0 Fuel Dispensing Areas □ Yes 0 No 0 N/A 0 Loading Docks □ Yes □ No 0 N/A 0 Fire Sprinkler Test Water □ Yes □No 0 N/A 0 Miscellaneous Drain or Wash Water □ Yes 0 No 0 N/A 0 Plazas, sidewalks, and oarkina lots □ Yes 0 No 0 N/A For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers. For all items marked "Yes" see attached Appendix E.1 with Potential Sources, Controls and Operational BMPs defi ned E-36 Page 2 of 4 Revised 03/16 Site Design BMPs All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual for information to implement site design BMPs shown in this checklist. Answer each category below pursuant to the following. • "Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of the Model BMP Design Manual. Discussion/ justification is not required. • "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. • "N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be provided. Source Control Requirement ' l Applied? SD-1 Maintain Natural Drainage Pathwavs and Hvdroloaic Features I □ Yes I 0 No I □ NIA Discussion/justification if SD-1 not implemented: The site has been previously developed and there are no natural drainage pathways or hydrolgic features remaining on the site. SD-2 Conserve Natural Areas, Soils, and Vegetation I □ Yes I 0 No I □ N/A Discussion/justification if SD-2 not implemented: The site has been previously developed and there are no natural areas, soils or vegetation on the site. SD-3 Minimize Impervious Area I 0 Yes 1 0 No I □ N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction l 0 Yes l D No I □ NIA Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion I 0 Yes I □ No I □ N/A Discussion/justification if SD-5 not implemented: E-36 Page 3 of 4 Revised 03/16 Source Control Requirement <continued) ,, ' I Annlied? SD-6 Runoff Collection I 0 Yes \ D No I D NIA Discussion/justification if SD-6 not implemented: SD-7 Landscapina with Native or Drought Tolerant Soecies I 0 Yes I D No I D NIA Discussion/justification if SD-7 not implemented: SD-8 Harvestina and Usina Precipitation I D Yes I 0 No I D NIA Discussion/justification if SD-8 not implemented: Site is a small previously developed site which experiences only small runoff that makes it impracticle to harvest and use the precipitation. E-36 Page 4 of 4 Revised 03/16 SUMMARY OF PDP STRUCTURAL BMPS PDP Structural BMPs All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control must be based on the selection process described in Chapter 5. PDPs subject to hydromodification management requirements must also implement structural BMPs for flow control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both storm water pollutant control and flow control for hydromodification management can be achieved within the same structural BMP(s). PDP structural BMPs must be verified by the City at the completion of construction. This may include requiring the project owner or project owner's representative to certify construction of the structural BMPs (see Section 1.1 2 of the BMP Design Manual). PDP structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual). Use this form to provide narrative description of the general strategy for structural BMP implementation at the project site in the box below. Then complete the PDP structural BMP summary information sheet for each structural BMP within the project (copy the BMP summary information page as many times as needed to provide summary information for each individual structural BMP). Describe the general strategy for structural BMP implementation at the site. This information must describe how the steps for selecting and designing storm water pollutant control BMPs presented in Section 5.1 of the BMP Design Manual were followed, and the results (type of BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether pollutant control and flow control BMPs are integrated together or separate. The three proposed Biofiltration Basins are considered by the City of Carlsbad as structural BMPs. It is sized for treatment using 3% of adjusted area. Calculations for the three basins are included in Attachment le. [Continue on next page as necessary.] ... ... -... ... ... ... ... 11111 ... .. ... -.. ... ... .. -----... --- ------- [Continued from previous page -This page is reserved for continuation of description of general strategy for structural BMP implementation at the site.] Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMPl Structural BMP ID No. Biofiltration Basin #1 DWG Sheet No. Type of structural BMP: D Retention by harvest and use (HU-1 ) D Retention by infiltration basin (INF-1 ) D Retention by bioretention (INF-2) n Retention by permeable pavement (INF-3) [J Partial retention by biofiltration with partial retention (PR-1) ::&Biofiltration (BF-1) □ Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) o Detention pond or vault for hydromodification management Ll Other (describe in discussion section below) Purpose: ::&Pollutant control only n Hydromodification control only D Combined pollutant control and hydromodification control o Pre-treatment/forebay for another structural BMP □ Other (describe in discussion section below) Discussion (as needed): The proposed Biofiltration Basins #1 is considered by the City of Carlsbad as structural BMPs. It is sized for treatment using 3% of adjusted area. Calculations for the three basins are included in Attachment le. Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMPJ Structural BMP ID No. Biofiltration Basin #2 DWG Sheet No. Type of structural BMP: □ Retention by harvest and use (HU-1) □ Retention by infiltration basin (INF-1) □ Retention by bioretention (INF-2) D Retention by permeable pavement (INF-3) Partial retention by biofiltration with partial retention (PR-1) ~Biofiltration (BF-1) □ Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) □ Detention pond or vault for hydromodification management D Other (describe in discussion section below) Purpose: )(Pollutant control only 1 Hydromodification control only □ Combined pollutant control and hydromodification control □ Pre-treatment/forebay for another structural BMP □ Other (describe in discussion section below) Discussion (as needed): The proposed Biofiltration Basins #2 is considered by the City of Carlsbad as structural BMPs. It is sized for treatment using 3% of adjusted area. Calculations for the three basins are included in Attachment le. Structural BMP Summary Information (Copy this page as needed to provide information for each individual proposed structural BMP] Structural BMP ID No. Biofiltration Basin #3 DWG Sheet No. Type of structural BMP: D Retention by harvest and use (HU-1) D Retention by infiltration basin (INF-1) D Retention by bioretention (INF-2) [ Retention by permeable pavement {INF-3) n Partial retention by biofiltration with partial retention (PR-1 ) ::&Biofiltration (BF-1) D Flow-thru treatment control included as pre-treatmenVforebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) D Detention pond or vault for hydromodification management I Other {describe in discussion section below) Purpose: )(Pollutant control only L Hydromodification control only D Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP C Other (describe in discussion section below) Discussion (as needed): The proposed Biofiltration Basins #3 is considered by the City of Carlsbad as structural BMPs. It is sized for treatment using 3% of adjusted area. Calculations for the three basins are included in Attachment l e. ... .. -.. .. ... .. ... ... -.. ... - ... ... ... -... ... ... ... -... -... ... ---... -... ... ATTACHMENT 1 BACKUP FOR PDP POLLUTANT CONTROL BMPS This is the cover sheet for Attachment 1 . Check which Items are Included behind this cover sheet: Attachment Contents Checklist Seauence Attachment 1 a OMA Exhibit (Required) Attachment 1 b Attachment 1 c Attachment 1 d See OMA Exhibit Checklist on the back of this Attachment cover sheet. (24"x36" Exhibit typically required) Tabular Summary of DMAs Showing OMA ID matching OMA Exhibit, OMA Area, and OMA Type (Required)* *Provide table in this Attachment OR on OMA Exhibit in Attachment 1 a Form 1-7, Harvest and Use Feasibility Screening Checklist (Required unless the entire project will use infiltration BMPs) Refer to Appendix B.3-1 of the BMP Design Manual to complete Form 1-7 . Form 1-8, Categorization of Infiltration Feasibility Condition (Required unless the project will use harvest and use BMPs) Refer to Appendices C and D of the BMP Design Manual to complete Form 1-8 . ):!Included ):! Included on OMA Exhibit in Attachment 1 a □ Included as Attachment 1 b, separate from OMA Exhibit l1(Included D Not included because the entire project will use infiltration BMPs Considered to be unfeasible ~Included D Not included because the entire project will use harvest and use BMPs Attachment 1 e Pollutant Control BMP Design )(Included Worksheets / Calculations (Required) Refer to Appendires B and E of the BMP Design Manual for structural pollutant control BMP design guidelines See Worksheets B.2-1 and Worksheets B.5-1 BMP sizing Orifice sizing _! 10' w _J _J <[ ! 1· l ,, ' / 20' 1 O' i,. ~ ~ '). Z.· ~J: ' FS45.50 -----111----"-!-x ,.,sr= ,-:,-•, --,.~-- /IDFILTRAT!DtD BASIN #1 "i 1ST FLOOR BL.TJC:. <":f,,;,;:, N55.30'0, "E 139.62' ''\!c PROPERTY LINl ---7 BASIN (DMA1) FOR BIOFILTRATION BASIN #1 '1ST FLOOR DMA ID DESCRIPTION AREA 1 IMPER\10US 4575.901 SF 2 LANDSCAPE 781.254 sc !lMI\ AREA • 5357.155 SF ADJUSTED AREA x 0.03 • '125.4 SF REQUIRED • 300.00 SF PROVIDED BASIN (DMA 1) FOR BIOFIURA TION BASIN #3 2ND FLOOR OMA ID DESCRIPTION -. AREA 1 IMPERVIOLS 4294.475 SF 2 LANDSCAPE OMA AREA • 4865.822 SF ADJUSTED AREA x 0.03 • 117.7 SF REQUJRED • 220.00 Sf ?ROl/llJED 671.4~7 SF ---------- Bl□FILTRATIDN BASIN #2 0® 2ND FLOOR\:::_/ BASIN (DMA1) FOR BIOFILTRA TION BASIN #2 2ND FLOOR OMA ID DESCRIPTION AREA 1 IMPERVIOUS 4253.280 SF 2 LANDSCAPE 542.192 SF DMA AREA • 4795.472 Sf ADJUSTED AREA x 0.03 • 116.5 SF REQUll'.ED • 220.00 SF PRO\IIDED EASEMENT Si AN EASEMENT FOR THE PURPOSE SHOWN BELOW AND RIGHTS INCIDENTAL THERETO AS SET FORTH !N A DOCUMENT. GRANTED TO: SAN DIEGO DAS AND ELECTRIC COMPANY PURPOSE: UNDERGROUNDING FACILITIES AND ABOVE GROUND STRUCTURES TOGETHER WITH THE RIGHT OF INGRESS AND EGRESS THEREFROM RECORDED: NOVEMBER 9, 1976 AS FILE NO. 76-374117 OF OFFICIAL RECORDS THE EXACT LOCATION AND EXTENT OF SA!D EASEMENT IS NOT DISCLOSED OF RECORD. 1-w w O:::'. I- v? I I BENCH MARK CLSB-130 (S[[ ROS 17271) S\1\/MP NO. ____ _ PARTY RESPONSIBLE FOR MAINTENANCE: NAME PRIVATE PROPERTIES, LLC ADDRESS P.O. BOX 669 CONTACT DR. BRUCE B.4KER POWAY, CA 92074 PHONENO. (858) 717-2929 PLAN PREPARED BY: NAME LAWRENCE E. COLE COMPANY LANDMARK ENGINEERING CORP. ADDRESS 3443 CAMINO DEL RIO SOUTH SUITE #204 SAN DIEGO, CA 92108 PHONE NO. (619) 260-0420 SIGNATURE VICINITY MAP NOTES, ND SCALE 1. THE UNDERLYING HYDR□L □GIC SOIL GROUP IS GROUP B 2. THE APPROXIMATE DEPTH OF GROUND\./1'.TER IS GREATER THAN 10 FEET TD BE VERIFIED DURNG GRADING. 3. THERE ARE ND EXISTING NATURAL HYDR□L □GIC FEATURES ON THIS SITE. 4. THERE ARE ND CRITICAL COURSE SEDIMENT YIELD ?\REAS TD BE PROTECTED ON THIS SITE. 5. EXISTING TOPOGRAPHY AND IMPERVIOUS AREAS SHO\,/N HEREON. 6. THERE ARE ND EXISTING DR PROPOSED SITE DRAINAGE CONNECTIONS TD DRAINAGE OrFSl:E. 7, PROPOSED GRADING SHD\./N HEREON. 8. PROPOSED IMPERVIOUS FEATURES SHD\./N HEREON. 9. PROPOSED DESIGNED FEATURES SHO\./N HEREON. 10. DRAINAGE MANAGEMENT AREA (DMA) BOUNDARIES, DMA ID NUMBERS, DMA AREAS AND DMA TYPE 11. ND STRUCTUR?\L BMPs ?IRE PROPOSED, TREATMENT PROVIDED BY FLO\./ THROUGH PLANTERS AND FILTER INSERT IN PRIVATE CATCH BASIN. LEGEND, ITEM PROPERTY UNE EX, EXISTING CONTOUR EXISllNG SPOT ELEVATION EX. ASPHALT EX. CONCRETE EX. WATER METER EX. FIRE HYDRANT EX. PD\4ER POLE PROPOSED LOWER DECK PROPOSED UPPER DECK PROPOSED SLOPED ROOF FLOW DIRECTION PROPOSED CONCRETE PROPOSED CURB PROPOSED CURB & GUTTER GUTTER DR!VE\./AY TOP OF CURB FLOW LINE PAVEMENT FINISH FLOOR , No. SYl<IB□L .,,.'M ~ ~ ffilJlI[Il]] D\.!Y TC FL p FF REVISIONS No. 36292 E:,q:,. 06/30/22 If * 11 CJV\\,, Date LEGAL DESCRIPTION: LOTS 23, 24, 25, 26 IN BLOCK 48 OR TOWN OF CARLSBAD, IN THE CITY OF CARLSBAD, COUNTY OF SAN DIEGO, STATE OF CALIFORNIA, ACCORDING TO MAP THEREOF NO. 535, FILED IN THE OFFICE OF THE COUNTY RECORDER OF SAN DIEGO COUNTY, MAY 2, . 1888 . ASSESSOR'S PARCEL NUMBER: 203-351-12-00 & 203-351-13-00 DMA EXHIBIT JEFFERSOJ\l LUXU_RY APARTMENTS Carlsbad, CA PREPARED FOR: LANDMARK ENGINEERING CORPORATION S[T 2.5' DISK IN SOUTH[AST CORNER Description Approved FIRST RM PROPERTIES 1010 PEARL STREET #12 LA JOLLA, CA 92037 L E C 3443 Camino Del Rio South Suite 204 OF DRAINAGE BOX INL[T AT TH[ [ND OF CURB RETURN IN TH[ NORTH[AST CORNER OF GRAND AV[NU[ AND \./ASHINGTON ST. NGVD29 [L[V.; 40.91 ;Sht 1 of 1 · Date:B/05/15 Dwn. MC San Diego, CA 92108 (619) 260-0420 Apr. LEC Dwg. No. 2403-TOP0-1 I Appendix I: Forms and Checklists 1. ls there a demand for harvested water (check all that apply) at the project site that is reliably present during the wet season? D Toilet and urinal flushing ~ Landscape irrigation D Other: _____ _ 2. If there is a demand; estimate the anticipated average wet season demand over a period of 36 hours. Guidance for planning level demand calculations for toilet/urinal flushing and landscape irrigation is provided in Section B.3.2. HA= 1213.9 sf (Planters and landscape) [Provide a summary of calculations herej Per Table 8 .3-3 Moderate Plant Water Use use 1470 Planning level demand = 12 13.9/43560 x 1470 = 40.9 3. Calculate the DCV using worksheet B.2-l. DCV = 3630 x C x d x A C = 0.83 d = 0.59 A = 0.436 DCV = 775.0 (cubic feet) = 3630 x 0.83 x 0.59 x 0.436 0.25DCV = 193.75 3a. Is the 36 hour demand greater than or equal to the DC\T) D Yes / MNo ~ -0. Harvest and use appears to be feasible. Conduct more detailed evaluation and sizing calculations to confirm that DCV can be used at an adequate rate to meet drawdown criteria. 36. Is the 36 hour demand greater than 0.25DCV but less than the full DCV? D Yes / N No ~ ~ Harvest and use may be feasible. Conduct more detailed evaluation and sizing calculations to determine feasibility. Harvest and use may only be able to be used for a portion of the site, or (optionally) the storage. may need to be upsized ro meet long term capture targets while draining in longer than 36 hours. Is harvest and use feasible based on further evaluation? Yes, n::fer to Appendix E to select and size harvest and use BMPs. M No, select alternate BMPs. I-2 3c. Is the 36 hour demand less than 0.25DCV? }!1'. Yes ,0. Harvest and use is considered to be infeasible. February 2016 Appendix I: Forms and Checklists Pa.t;t 1 -Full Infiltration Feasibili!Y Screening Criteria Would infiltration of the full design volume be feasible from a physical perspective without any undesirable consequences that cannot be reasonably mitigated? Criteria Screening Question Is the estimated reliable infiltration rate below proposed facility locations greater than 0.5 inches per hour? The response co this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and Appendix D. Yes X Provide basis: Response is based on typical capabilitites of Group B Soils. No Verification by Geotechnical Report and observation during construction. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. · 2 Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of geotechnical hazards (slope stability, groundwater mounding, utilities, or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2. X Provide basis: Response is based on small area of proposed infiltration, no slope design and no utility conflicts. Verification by Geotechnical Report and observation during construction. Summarize findings of sn1dies; provide reference t0 studies, calculatiuns, maps, data sources, etc. Provide narrative discussion of sn,dy / data source applicability. I-3 February 2016 Crite.ri a 3 Appendix I: Forms and Checklists Screening Question Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of groundwater contamination (shallow water table, storm water pollutants or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the faccors presented in Appendix C.3. Yes No X Provide basis: Response is based on assumed water table depth and anticipated pollutants. Verification by Geotechnical Report and observation during construction. Summarize findings of studies; provide reference cu studies, calculations, maps, data sources, etc. Provide narrative discussion of study/dara source applicabiliry. 4 Can infiltration greater than 0.5 inches per hour be allowed without causing potential water balance issues such as change of seasonality of ephemeral streams or increased discharge of contaminated groundwater to surface waters? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. X Provide basis: Prroposed small area of infiltration has little or no affect on any water balance issues. Summarize findings of studies; provide reference to studies, calculaLions, maps, data sources, etc. Provide narraLiYe discussion of study/ data source applicability. Part 1 Result * lf all an~·wers to rows 1 -4 are "Yes" a full infiltration design is potentially feasible. The feasibility screening category is Full Infiltration Planter boxes do not allow for full infiltration. lf any answer from row 1-4 is "N o", infiltraLion may be possible to some extent but would not generally be feasible or desirable to achieve a "full infiltration" design. Proceed 10 Part 2 "To be completed usmg gathered SltC informaoon and best professional judgment considering the dcfinmon of MEP in the MS4 Permit. Additional testing and/ or studies may be required by the Ciry to substantiate findings. 1-4 February 2016 Appendix I: Forms and Checklists Part 2 -Partial Infiltration vs. No Infilttadon Feasibility Screening Criteria Would infiltration of water in any appreciable amount be physically feasible without any negative consequences that cannot be reasonably mitigated? Criteria 5 Screening Question Do soil and geologic conditions allow for infiltration in any appreciable rate or volume? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and Appendix D. Provide basis: Yes No X Sununarize findings of studies; provide reference: cu studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates. 6 Can Infiltration in any appreciable quantity be allowed without increasing risk of gcotechnical hazards (slope stability, groundwater mounding, utilities, or other factors) that cannot be mitigated to an acceptable level? The:: response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2. Provide basis: X Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability and why it was not feasible to rnitig.ite low infiltration rates. 1-5 February 2016 Criteria 7 Appendix I: Forms and Checklists Screening Question Can Infiltration in any appreciable quantity be allowed without posing significant risk for groundwater related concerns (shallow water table, storm water pollutants or other factors)? The response to this Screening Question shaU be based on a comprehensive evaluation of the factors presented in Appendix C.3. Yes No X Provide basis: Verification by Geotechnical Report and observation during construction. Assumes no appreciable quantity of infiltration for project. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates. 8 Can infiltration be allowed without violating downstream water rights? The response to th.is Screening Question shall be based on a comprehensive evaluation of the factors presenred in Appendix C.3. X Provide basis: Verification by Geotechnical Report and observation during construction. Assumes no appreciable quantity of infiltration for project. Summarize findings of ~rudies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicabili1:y and why it was not feasible to mitigate low infiltration rates. Part 2 Result* If all answers from row 5-8 are yes then partial infiltration design is potentially feasible. The feasibililJ screening category is Partial Infiltration. Landscape Areas do provide Partial Infiltration in Tree Wells. If any answer from row 5-8 is no, then infiltration of any volume is considei·ed to be infeasible within the drainage area. The feasibility screening category is N o Infiltration. *To be completed us111g gathered site 111forrnation and best professional Judgment considering the definition of MEP in the MS4 Permit. Additional resting and/or studies may be required by the City to substantiate findings. I-6 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.2-1. DCV ~'•--::-;;;;"l..,~-V-v<f'~;:'Zi;; ;;ci<"f'1'""0 ,ij:,~;1>~••~,,,;,;.--.,,-,.,.,-r3f•· •~c,~,;;,·~~~,:,-~• 'i,·::1~i ~).~sign ::C~ptu,r¢ Voh,m)e · -·, ·" ·, · ,.· :. ~ 1 , ·:/; ,-,Woi:RshcctlB=-2.1, • .J.J....L.~~~~ ..... ~ ~ _,,,:-~~-..J.---· 1 85th percentile 24-hr storm depth from Figure B.1-1 d= 0.59 inches 2 Area rributarv to BMP (s) A= 0.123 acres Area weighted rnnoff factor (estimate using Appendix 3 B.1.1 and B.2.1) C= 0.78 unitless 4 Tree wells volume reduction TCV= NA cubic-feet 5 Rain barrels volume reduction RCV= NIA cubic-feet Calculate DCV = 6 (3630 x C x d x A) -TCV -RCV DCV= 205.5 cubic-feet BASIN DMAl/BMP 1 B-10 February 2016 Appendix B: Storm Water Pollutant Control H ydrologic Calculations and Sizing Methods Worksh eet B.2-1. D CV ~-.. ,-,-,.,..--~ ·--.:· n---~ . .,-,-----.,. ~;--=-,'"7 .----,-;-, ,--~-. -,'""r--r.•-....,.,-~;_,,:;n,r----,;-· ..... ~~-~ 'li''7'""'1f; : · · .. Design,Capture•Volume·-· · .··!•-,j:-~ ""-·'..-•Wr>r~licct'.B~2~11~-:,.;i;-~, ~-~· .~:l,~=-"-~l!::~~~-..,_,....i.:.., L-~~ ... 1 85th percentile 24-hr storm depth from Figure B.1-1 d= 0.59 inches 2 Arca tributarv to BMP (s) A= 0.1 10 acres Area weighted mnoff factor (estimate using Appendix 3 B.1.1 and B.2.1) C= 0.81 unitless 4 Tree wells volume reduction TCV= NA cubic-feet 5 Ra.in barrels volume reduction RCV= NIA cubic-feet Calculate DCV = 6 (3630 x C x d x A) -TCV -RCV DCV= 190.8 cubic-feet BASIN DMA2/BMP 2 B-10 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.2-1. DCV L~~ -·_··_ ·Dcsiw,i=~~})t~rc V~l~n~=--~'.'.:~·.:: .-.\~.i~11~~_13~2i1~~~~~J 1 85th percentile 24-hr storm depth from Figure B.1-1 d= 0.59 inches 2 Arca tributary to BMP (s) A= 0.114 acres Area weighted runoff factor (estimate using Appendix 3 B.1.1 and B.2.1 ) C= 0.79 unitless 4 Tree wells volume reduction TCV= NA cubic-feet 5 Rain barrels volume reduction RCV= NIA cubic-feet Calculate DCV = 6 (3630 x C x d x A) -TCV -RCV DCV= 192.9 cubic-feet BASIN DMA3/BMP 3 B-10 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs -' '""ni-1 Remaining D CV after implementing retention BMPs 205.5 cubic-feet Partial Retention 2 Infiltration rate from Form 1-9 if partial infiltration is feasible NF in/hr. 3 Allowable drawdown time for aggregate storage below the underdrain 36 hours 4 Depth of runoff that can be infiltrated lLine 2 x Line 3J 0 inches 5 Aggregate pore space 0.40 in/in 6 Required depth of gravel below the underdrain [Line 4/ Line SJ 0 inches 7 Assumed surface area of the bioftltration BMP sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8))/12) x Line 7 0 cubic-feet 10 DCV that requires biofiltration [Linc 1 -Line 9] 205.5 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimum, 12 inch maximum] 6 inches 12 Media Thickness [18 inches minimum], also add mulch layer thickness to this line for sizing calculations 18 inches 13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 12 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Media available pore space 0.2 in/in 15 Media filtration rate to be used for sizing (5 in/hr. with no outlet control; 5 in/hr. if the filtration is controlled by the outlet, use the outlet controlled rate) Baseline Calculations .. 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm l Line 15 x Line I 6) 30 inches 18 Depth of Detention Storage !Line 11 + (Line 12 x Line 14) + (Line 13 x Line S)] 32.4 inches 19 T oral Depth Treated [Line 17 + Line 18] 62.4 inches Option 1 -Biofilter 1.5 times the DCV 20 Required biofilrered volume [1.5 x Line 10] 308.25 cubic-feet 21 Required Footprint !Line 20/ Line 191 x 12 59.3 sq-ft Option 2 -Store 0.75 of remain.ine DCV in pores and pondine 22 Required Storage (surface+ pores) Volume [0.75 x Linc 10] 154.125 cubic-feet 23 Required Footprint lLine 22/ Line 18] x 12 57.08 sq-ft Footprint of the BMP 24 Area draining to the BMP 5357. sq-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appendix 13.1 and B.2) 0.78 26 Minimum BMP Fooq1rint [Line 24 x Line 25 x 0.031 125.4 sq-ft 27 Footprint of the BMP = Maximum(Minimum(Line 21, J .ine 23), Line 26) 125.4 sq-ft Note: Linc 7 is usc:d to estimate the amount of volume retained by the 13MP. Update assumed surface area in Line 7 until its e9uivalcnt to the re9uired biofiltration footprint (either Linc 21 or I .inc 23) BASIN DMAl/BMP 1 B-26 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltracion BMPs ~"1111,, "--1 Remaining DCV after implementing retention BMPs 190.8 cubic-feet Partial Retention 2 Infiltration rate from Form I-9 if partial infiltration is feasible NF in/hr. 3 Allowable drawdown time for aggregate storage below the underdrain 36 hours 4 Depth of runoff that can be infiltrated lLine 2 x Line 3] 0 inches 5 Aggregate pore space 0.40 in/in 6 Required depth of gravel below the underdrain [Line 4/ Line 5] 0 inches 7 Assumed surface area of the biofiltration BMP sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8))/12] x Line 7 0 cubic-feet 10 DCV that requires biofilrration [Line 1 -Line 9] 190.8 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimwn, 12 inch maximum] 6 inches 12 Media Thickness 118 inches minimum], also add mulch layer thickness to 18 inches this line for sizing calculations 13 Aggregate Storage above underdrain invert (12 inches typical) -me 0 12 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Media available pore space 0.2 in/in 15 Media filtration race to be used for sizing (5 in/hr. wich no outlet control; 5 in/hr. if the filtration is controlled by the outlet, use the outlet controlled rate) Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm [ Line 15 x Line 16] 30 inches 18 Depth of Detention Storage 32.4 inches [Line 11 + (J ,ine 12 x ] ,ine 14) + (Line 13 x J ,ine S)] 19 Total Depth Treated !Line 17 + Lne 18] 62.4 inches Option 1 -Biofiltcr 1.5 times the DCV 20 Required biofilcercd volume [1.5 x Lne 10] 286.2 cubic-feet 21 Required Footprint [I .ine 20/ Line 19] x 12 55.0 sq-ft Option 2 -Store 0.75 of remainiru!' DCV in pores and ponding 22 Required Storage (surface+ pores) Volume [0.75 x Lne 10] 143.1 cubic-feet 23 Required Footprint [Line 22/ Line 18] x 12 53.0 sq-ft Footorint of the BMP 24 Area draining to the BMP 4795.5 sq-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and B.2) 0.81 26 Minimum BMP Footprint [I .ine 24 x Line 25 x 0.03] 116.5 sg-ft 27 Footprint of the BMP = Maximum(Minimum(Jjne 21, Line 23), Line 26) 116.5 sq-ft Note: Line 7 is used to estimate the amount of volume retained by the BMP. Update assumed surface area in Line 7 until ,rs equivalent rn the required biofilrraaon foorpnnt (either Line 21 or Line 23) BASIN DMA2/BMP 2 B-26 February 2016 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs •••••·-IUI . 1; .. , 1 Remaining DCV after implementing retention BMPs 192.9 cubic-feet Partial Retention 2 Infiltration rate from Form 1-9 if partial infiltration is feasible NF in/hr. 3 Allowable drawdown time for ag_'51"egatc storage below the underdrain 36 hours 4 Depth of runoff thar can be infiltrated lLine 2 x Line 3] 0 inches 5 Aggregate pore space 0.40 in/in 6 Required depth of gravel below the underdrain [Line 4/ Line 5] 0 inches 7 Assumed surface area of the biofiltration BMP sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8))/12] x Line 7 0 cubic-feet 10 DCV that requires biofilcration [Line 1 -Line 9] 192.9 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimum, 12 inch maximum] 6 inches 12 Media Thickness [18 inches minimum], also add mulch layer thickness to 18 inches this line for sizing calculations 13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 12 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Media available pore space 0.2 in/in 15 Media filtration rate to be used for sizing (5 in/hr. with no outlet control; 5 in/hr. if the filtration is controlled by the outlet, use the outlet controlled rate) Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm l Line 15 x Line 16] 30 inches 18 Depth of Detention Storage I Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)] 32.4 inches 19 T otal Depth Treated [Line 17 + Line 18] 62.4 inches Option 1 -Biofiltcr 1.5 times the DCV 20 Required biofiltered volume (1.5 x Line 10] 289.4 cubic-feet 21 Required Footprint !Line 20/ Line 19] x 12 55.6 sg-ft Option 2 -Store 0.75 of remainine DCV in pores and pondine 22 Required Storage (surface + pores) Volume [0.75 x Line 10] 144.7 cubic-feet 23 Required Footprint [Line 22/ Line 18] x 12 53.6 sq-ft Footorint of the BMP 24 Area draining to the BMP 4965.9 sg-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appendix 13.1 and B.2) 0.79 26 Minimum BMP Footprint [Line 24 x 1 .ine 25 x 0.03] 11 7. 7 sg-ft 27 .footprint of the BMP = Maxi mum(Minimu.m(Line 21, Line 23), Une 26) 117.7 sg-ft Note: Line 7 is used to estimate: the amount of volume retained by the BMP. Update assumed surface area in Line 7 until its equt\'~lenr ro the reqwred biofilcration foorp□m (either Line 21 or I .ine 23) BASIN DMA3/BMP 3 B-26 February 2016 r 1 , 1 r 1 r 1 r 1 r 1 r 1 r , r 1 r 1 r 1 r I r 1 r 1 r 1 r 1 r 1 r I r 1 BASIN (OMA 1) FOR BIOFIL TRATION BASIN #1 1 ST FLOOR OMA ID DESCRIPTION AREA 1 IMPERVIOUS 4575.901 SF 2 LANDSCAPE 781.254 SF OMA AREA • 5357.155 SF ADJUSTED AREA x 0.03 • 125.4 SF REQUIRED ■ 300.00 SF PROVIDED BASIN (OMA 1) FOR BIOFIL TRATION BASIN #3 2ND FLOOR OMA ID DESCRIPTION AREA 1 IMPERVIOUS 4294.475 SF 2 LANDSCAPE OMA AREA • 4965.922 SF ADJUSTED AREA x 0.03 • 117.7 SF REQUIRED • 220.00 SF PROVIDED 671.447 SF BASIN (OMA 1) FOR BIOFIL TRA TION BASIN #2 2NO FLOOR OMA ID DESCRIPTION AREA 1 IMPERVIOUS 4253.280 SF 2 LANDSCAPE DMA AREA • 4795.472 SF ADJUSTED AREA x 0.03 • 116.5 SF REQUIRED • 220.00 SF PROVIDED 542.192 SF .. .. ... .. -.. -... -... ... ... ... ... ... ... ... -... -... ... -... ... ... ... ... ... ... .. ... ... .. ... - Use this checklist to ensure the required information has been included on the OMA The OMA Exhibit must identify: )(Underlying hydrologic soil group )(Approximate depth to groundwater Exhibit: }!Existing natural hydrologic features (watercourses, seeps, springs, wetlands) }!Critical coarse sediment yield areas to be protected (if present) )(Existing topography and impervious areas MExisting and proposed site drainage networ1< and connections to drainage offsite MProposed grading ~Proposed impervious features ~ Proposed design features and surface treatments used to minimize imperviousness )(Drainage management area (OMA) boundaries, OMA ID numbers, and OMA areas (square footage or acreage), and OMA type (i.e., drains to BMP, self-retaining, or self-mitigating) MStructural BMPs (identify location and type of BMP) ---... -.. ... ... ... .. ... ... ---... -... ... ... -... -... -... -... ... ... ... .. -... -... -... ATTACHMENT 2 BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES [This is the cover sheet for Attachment 2.] Indicate which Items are Included behind this cover sheet: Attachment Contents Checklist SeQuence Attachment 2a Hydromodification Management D Included Not Applicalble Exhibit (Required) See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse MExhibit showing project drainage Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA is required, additional analyses are Critical Coarse Sediment Yield optional) Area Map (Required) See Section 6.2 of the BMP Design Optional analy.,es for Critical Coarse Manual. Sediment Yield Area Determination ){6.2.1 Verification of Geomorphic Landscape Units Onsite )(6.2.2 Downstream Systems Sensitivity to Coarse Sediment )(6.2.3 Optional Additional Ana~sis of Potential Critical Coarse Sediment Yield Areas Onsite Attachment 2c Geomorphic Assessment of Receiving )(Not performed Channels (Optional) □ Included See Section 6.3.4 of the BMP Design Manual. Attachment 2d Flow Control Facility Design and □ Included Structural BMP Drawdown Not Applicable Calculations (Required) See Chapter 6 and Appendix G of the BMP Desion Manual ---------------.. -.. --.. ---.. ... -.. -... -.. ... .. -.. Use this checklist to ensure the required information has been included on the Hydromodification Management Exhibit: The Hydromodification Management Exhibit must identify: □ Underlying hydrologic soil group □ Approximate depth to groundwater □ Existing natural hydrologic features ( watercourses, seeps, springs, wetlands) □ Critical coarse sediment yield areas to be protected (if present) □ Existing topography □ Existing and proposed site drainage network and connections to drainage offsite D Proposed grading □ Proposed impervious features □ Proposed design features and surface treatments used to minimize imperviousness □ Point(s) of Complianre (POC) for Hydromodification Management □ Existing and proposed drainage boundary and drainage area to each POC (when necessary, create separate exhibits for pre-development and post-project conditions) D Structural BMPs for hydromodification management (identify location, type of BMP, and size/detail) Note: The site is exempt from Hydromodification Management requirements (See attached documention), therefore preparation of a Hydromodification Management Exhibit and the checklist above is NOT APPLICABLE. -.. -.. -.. -... -... -... -... ... - - - -... - -... -... -... -.. -... -... ATTACHMENT 3 Structural BMP Maintenance Information Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment: Preliminary Design/Planning/CECA level submittal: Attachment 3 must identify: M Typical maintenance indicators and actions for proposed structural BMP(s) based on Section 7.7 of the BMP Design Manual Final Design level submittal: Attachment 3 must identify: D Specific maintenance indicators and actions for proposed structural BMP(s). This shall be based on Section 7.7 of the BMP Design Manual and enhanced to reflect actual proposed components of the structural BMP(s) □ How to access the structural BMP(s) to inspect and perform maintenance □ Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the structural BMP and compare to maintenance thresholds) D Manufacturer and part number for proprietary parts of structural BMP(s) when applicable □ Maintenance thresholds for BMPs subject to siltation or heavy trash(e.g., silt level posts or other markings shall be included in all BMP components that will trap and store sediment, trash, and/or debris, so that the inspector may determine how full the BMP is, and the maintenance personnel may determine where the bottom of the BMP is . If required, posts or other markings shall be indicated and described on structural BMP plans.) □ Recommended equipment to perform maintenance □ When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management -------------------------------... ... --... -... ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit [Use the City's standard Single Sheet BMP Plan.] ·; I 'V· r\ V \:"&, -(Y) -= = - ::3 • "' -er, 0J ◊ ~ (Y) z DMAl 5357.155 SF 0.123 AC I□FILTRATI□CDN BASIN #1 1 1ST FLOOR 0 PROPERTY LlliE I , • I ·~ FF 78.85B ' FF 68.65Gj _ FF 58.65 GF 46.30 TRASH ENCLOSURE ' I [Ji_ ,- - i ' I / 4TH FLOOR FF 78.65 ----_JRD FLOOR FF 68.65 r---=""==-=~--=~=---2 N ID FLOOR FF 58,65 20' 10' 10' _ FS45.50 X. Q 100• 1.37 CFS POCoo2 !E5,P4,P51 LEGEND1 ITEM PROPERTY LINE EX, EXISTING CONTOUR EXISTING SPOT ELEVATION EX, ASPHALT EX, CONCRETE EX. WATER METER EX. FIRE HYQR.ANT EX. PO\IER POLE FILTRATION AREA FIRST FLOOR PROPOSED FLOW-THRU PLANTER SECOND FLOOR PROPOSED SLOPED ROOF FLOW DIRECTION PROPOSED CONCRETE PROPOSED ROOF DRAIN PROPOSED CURB PROPOSED CURB & GUTTER DRIVE\JAY TOP OF CURB FLOW LINE PAVEMENT FINISH FLOOR SYMBOL ·.,,;1CI FllCC( fillillIIIl] . . - D\JY TC FL p FF GAIRAGE FLR GF 46.30 I -----_/" COVER D PARKIN~i3ARAGE ( ! C, I I Ll BASIN (DMA1) FOR BIOFILTRATION BASIN #1 1ST FLOOR OMA ID DESCRIPTION AREA 1 IMPERVIOUS 4575.901 SF 2 LANDSCAPE 781.254 SF IJMA AREA • 5357.155 SF ADJUSTE!l AREA x 0.03 • 125.4 Sf REQUIRED • 300.00 SF PROVIDED BASIN (DMA1) FOR BIOFILTRATION BASIN #3 2ND FLOOR DMA ID DESCRIPTION AREA 1 IMPER\10US 4294.4-75 SF 2 LANDSCAPE DMII AREA • 4965.922 SF ADJUSTED AREA x 0.03 • 117,7 Sf REQUIRED • 220.00 SF PR01/IDED 671.447 SF I ELECT. ROOM RESIDENTIAL_ _ STORAGE DMA2 4795.472 SF 0.110 AC I -. ~ --·-.: .... :.'.'. - . .. . 0 BASIN (DMA1) FOR BIOFILTRATION BASIN #2 2ND FLOOR ' i OMA ID DESCRIPTION AREA ' ' 1 IMPERVIOUS 4253.280 SF 2 LANDSCAPE DMA AREA • 4795.472 SF ADJUSTED AREA x 0.03 • 116.5 SF REQUIRED • 220.00 SF PRO\IIDED 542.192 SF BIOFIL TRA TI □N ®® B.ASIN#2 2ND FLOOR B!□FIL TRA TION BASIN #3 0® 1ST FL□□R \.::_) _,.------MODIFIED D-25 'w'/3'xl2' OPENING & CLEAN□UT 1-w w 0::::: 1- (,/) z D (,/) 0::::: w Li_ w_ w 7 LANDSCAPE #2 GROUND LEVEL I l ( ) I I I I ! ! J ,_ <I -::;,·_ ~--MODIFIED D-25 \,//3'x12' OPENING & CLEANQUT Q \00 • 1.29 CFS POCm1 (P1, P2, P3l I DATE INITIAL ENGINEER OF WORK SWMP NO. ____ _ PARTY RESPONSIBLE FOR MAINTENANCE: NAME PRIVATE PROPERTIES, LLC ADDRESS P.O. BOX 669 CONTACT DR. BRUCE BAKER POWAY, CA 9207 4 PHONENO. (858) 717-2929 PLAN PREPARED BY: NAME LAWRENCE E. COLE COMPANY LANDMARK ENGINEERING CORP . ADDRESS 3443 CAMINO DEL RIO SOUTH SUilE #204 SAN )IEGO, CA 92108 PHONENO. (619) 260-0420 SIGNATURE BMPNOTES: --_CERTIFICATION ____ _ i. THESE BMPSAREMAN-:}ATORYTO BE INSTAIJ..ED PER MANUFACTURER'S RECOMMENDATIONS OR THESE PLANS. 2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM Tl-IE 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. BMP TABLE BMP ID# BMPTYPE SYMBOL CASQA NO. QUANTITY TREATMENT CONTROL CD BIOFll TRATION l™I 1 EA. BASIN 1ST FLOOR ®-® BIOFILTRATION l™I 2EA. BASIN 2ND FLOOR HYDROMOD!FICATION & TREATMENT CONTROL ' I HYDROMODIFICATION LOW IMPACT DESIGN (L.i.D.) ©-® ROOF DRAIN TO • SD-11 3EA. BMP SOURCE CONTROL Ci) INDOOR " D SD-32 TIRASH ENCLOSURE u J ®-® LANDSCAPE 1: ~ :1 SD-10, SD-12 PESTICIDE * CHOOSE FROM THE UST BELOW FOR COMPLETING Tl-IE FIELDS IN THE INSPEcnONS & MAINTENANCE FRENQUENCY COLUMNS: ANNUAL SEMI-ANNlJALL Y QUARTERLY BIMONTHLY MONTHLY AS NEEDED NONE WEEKLY 1 TIME PER YEAR 2 TIMES PER YEAR 3 TIMES PER YEAR 4 TIMES PER YEAR DRAWING NO. ---- 444-4A 444-4A SHEET NO.(S) INSPECTION * MAINTENANCE* FREQUENCY FREQUENCY ANNUALLY AS NEEDED I 4,5 ANNUALLY AS NEEDED 3, 4, 5 QUARTERLY AS NEEDED I SHfET I CITY OF CARLSBAD I SHlETS I ENGINEERING DEPARTMENT SINGLE SHEET BMP SITE PLAN JEFFERSON LUXURY APARTMENTS ' CARLSBAD, CA I RECORD COPY I PROJECT NO. I ' DA TE i INITIAL DATE INITIAL I DRAWING NO. I REVISION DESCRIPTION OTiiER APPROVAL CITY APPROVAL lNlllAL DATE ---.. - -... -... - -... -... -... -.. -.. ,.. ... -... -.. -... -... ... .. -... -.. Attachment 2a: Hydromodification Exemption Documention - - - -... -... -.. -... -... .... ... -... -... .... -.... ... .... ... -... -... -... ... -... Jefferson Luxury Apartments Chapter 1: Policies and Procedural Requirements NO Concrete conveyance to Ocean ~from hydromodification management requirements YES YES YES Hydromodification management controls required *Direct discharge refers to an uninterrupted hardened conveyance system; Note to be used in conjunction with Node Descriptions. FIGURE 1-2. Applicability ofHydromodification Management BMP Requirements 1-11 February 2016