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Home My WebLink AboutCT 2017-0002; TYLER STREET RESIDENCES; PRELIMINARY HYDROLOGY AND STORM WATERS STANDARD PROJECT REQUIREMENTS; 2017-04-05CT2017-0002/PUD 2017-0001 CITY OF CARLSBAD ENGINEERING DIVISION PRELIMINARY HYDROLOGY AND STORM WATER STANDARD PROJECT REQUIREMENTS FOR TYLER STREET RESIDENCES ENGINEER OF WORK di~ VINCENT L. SAMPO-RCE 44173 PREPARED BY: SAMPO ENGINEERING, INC. 171 SAXONY ROAD, SUITE 213 ENCINITAS, CA 92024 Tyler Street Residences Standard Development Project (760) 436-0660 1 APR 1 3 2017 ClTY UF C, .r :L >', D PU.'.]~ J!r J~ ~J: /! _ , . ! Sampo Engineering, Inc. 4/5/2017 Introduction The subject property is located at 3337 Tyler Street in the City of Carlsbad. The lot area is 0.34 gross acres or 14,818 square feet. The property has been previously developed with two one-story wood framed residences, porches, concrete flatwork, asphalt pavement driveway, planters etc. The subject property is surrounded by an apartment complex to the southeast and southwest, by a single family residence to the northwest and by Tyler Street to the northeast. A masonry wall approximately six feet in height is located on the apartment side of the property line adjacent to the southeasterly and southwesterly property lines of the subject property. Existing storm water runoff sheet flows on the surface in a southwesterly direction away from Tyler Street and toward the southwesterly property line at an approximate slope of two percent and ultimately toward the most westerly corner of the property. Runoff then continues to drain to the southwest on the surface, much of which infiltrates into the soil as it flows across a vacant strip of city owned land just to the northeast of the NCTD right-of-way. The flow at this point is significantly lower than the railroad tracks therefore runoff ponds at this location until it infiltrates into the soil or evaporates. No runoff from Tyler Street or adjacent properties drains onto the subject property. This project proposes to maintain the historical drainage pattern to the southwest. The owner proposes to demolish the existing structures and private improvements and to subdivide and construct a one-lot eight-unit condominium subdivision with attached garages, permeable paver driveway to serve all units, three on-site parking spaces, permeable paver walkway and patios, permeable concrete sidewalk along the right-of- way frontage of Tyler Street, and landscaping. The project anticipates a minor increase in runoff due to an increase in impervious surface area. The difference in volume will be detained via planter boxes collecting 231 CF of roof water when only 218 CF needed to be detained for no net increase Hydrology Summary A hydrology study utilizing the Rational Method was performed for the existing and proposed conditions and the results are as follows. The existing condition is composed of 1 hydrologic basin that includes the entire property. Existing Drainage Basin 1 has a tributary area of 0.34 AC with a runoff coefficient of C=0.66 and an anticipated flow for the 100-year storm of 0.83 CFS. The Proposed Drainage Basin 1 over the same area produces a runoff coefficient of C=0. 73 and an anticipated flow for the 100-year storm of 0.91 CFS. The total site impervious surface area is increased by 1,063 SF from the existing condition. The result being a minor increase in a 100-year event in the proposed condition of 0.08 CFS. Storm Water Quality Summary The project has been determined to be a "Standard Project" using the City of Carlsbad Storm Water Standards Questionnaire (E-34) and is therefore exempt from priority project requirements. The development proposes to reduce the discharge of pollutants offsite by utilizing Source Control and Site Design Low Impact Development (LID) Tyler Street Residences Standard Development Project 2 Sampo Engineering, Inc. 4/7/2017 BMP's to the maximum extent practical. The project soil type is B and allows for infiltration as tested by the project soil engineer, copies of which have been submitted. Storm Water Quality Summary (Cont.) The entire driveway access proposed is permeable pavers as are the front pathway, courtyard areas and sidewalk in the Tyler Street right-of-way. Landscaping, ground cover and vegetated swales will be used in yard areas to prevent erosion of the surface soil and slopes. Pervious hardscape has been designed to disperse runoff away from the building to landscape areas and vegetated drainage swales that drains on the surface to the southwesterly comer of the site where runoff will sheet flow toward the southwest as it currently does. The project soil engineer has recommended that impermeable liners be constructed around the perimeter of the building foundations (acting as cut off walls) to avoid lateral migration of infiltration under the building. Roof downspouts on the garage side of the project will be discharged onto the new permeable paver driveway and on the South (front yard) side of the project the roof drainage will drain on permeable pavers that will slope away from the buildings and toward a vegetated swale around the perimeter of the project. To avoid an increase in peak runoff from the project site in a 100-year event the design and project plans propose to detain the increase in runoff using two above grade detention basins, one at the southwesterly side of the southwesterly building (unit H) and one at the northeasterly side of the northeasterly building (unit A). From the Rational Method the increase in runoff volume due to the development is 218 cubic feet. The basins have been sized to detain this increase in volume by directing roof gutters and downspouts to the above grade detention basins. Together the two above grade detention basins have a capacity of 231 cubic feet which exceeds the increase due to development. Both detention basins systems will be integrated with the landscape design to provide treatment to storm water runoff generated on-site before discharging runoff in a controlled manner to the site. Tyler Street Residences Standard Development Project 3 Sampo Engineering, Inc. 4/7/2017 IMPERVIOUS AREA CALCULATIONS EXISTING •• Impervious Areas per Layer: C-CAL IMP DESCRIPTION IMPERVIOUS (SF) BLDG 2552. 00 SHED 125.00 CONG 2553.00 AC DRWY 497.00 PORCH 124.00 I:: 5851.00 (39%) PROPOSED •• Impervious Areas per Layer C-CALIMP DESCRIPTION IMPERVIOUS (SF) BLDG 6827.00 CONG. DRWY 87.00 6914.00 (47%) PROPOSED /:J. t. IMPERVIOUS (SF) : 1063.00 Note: Areas from AutoCAD + + .. Pervious Areas per Layer: DESCRIPTION PLANTER LANDS I:: .. Pervious Areas per Layer: DESCRIPTION LANDSCAPING PER. PAV. PAVERs t. PERVIOUS (SF) : C-CALCPER JN: 16-136 INITIALS: AO DATE: April 7, 2017 PERVIOUS (SF) TOTAL (SF) 104.00 8867.00 8971.00 (61%) C-CACPER PERVIOUS (SF) 1701.00 6207.00 7908.00 (53%) -1063.00 14822.00 ~00%) TOTAL(SF) 14822.00 (100~ 171 Saxony Road, Suite 213 • Encinitas, CA 92024 • P: 760-436-0660 • F: 760-436-0659 • info@sampoengineering.com DRAINAGE STUDY CALCULATOR EXISTING SITE DESCRIPTION: Area = 14,822 SF C-Factor (Values per Table 3-1 per County Hydrology Manual) Soil Type B, % Impervious< 40% therefore Cp = 0.51 ~ = (0.90)(% Impervious>+ (Cp)(1 -% Impervious) (0.9)(0.39) + (0.51 )(0.61) fl = 220 ( Watercourse Distance, FT) ~ = 1.4 ( Slope, % ) Ic1 = 1.8(1 .1 -C)(D)112 (S)'/3 1.8(1.1--0.59)(220)'1/2" f!.2 = 1.2 ( 2-Year, 6-Hourlsopluvial) P.10 = 1.6 ( 10-Year. 6-Hour lsopluvial) P.100 = 2.5 ( 100-Year. 6-Hourlsopluvial) 0 !2 = 7.44 P2 Dre, -0 ... s 7.44(1.2)(12.17)'(--0.645) f 10 = 7.44 P,0 Dr.,-0 .. s 7.44(1. 6)(12. 17)'(--0. 645) f 100 = 7.44 P,00 Dr.,-0 .. s 7.44(2.5)(12.17)'(--0.645) Q.2 = CIA (0.66)(1. 78 INIHR)(0.34 AC) _Q 10 = CIA (0.66)(2.38 INIHR)(0.34 AC) 52.100 = CIA (0.66)(3. 71 INIHR)(0.34 AC) Per San Diego County Hydrology Manual 2003 JN: 16-136 INITIALS: DB DATE: April 7, 2017 0.34 AC 0.66 12.17 MIN 1.78 IN/HR 2.38 IN/HR 3.71 IN/HR 0.4 CFS 0.53 CFS 0.83 CFS 171 Saxony Road, Suite 213 • Encinitas, CA 92024 • P: 760-436-0660 • F: 760-436-0659 • info@sampoengineering.com DRAINAGE STUDY CALCULATOR PROPOSED SITE DESCRIPTION: Area = 14,822 SF C-Fir;.tor (V2IU~S Q.~f Tab/~ 3-1 Q.~r !:;Oldn{k'. HvdrQIQSJ.k'. M2nld2fl Soil Type B, % Impervious< 50% therefore Cp = 0.58 ~ = (0.90)(% Impervious>+ (Cp)(1 -% Impervious) (0.9)(0.47) + (0.58)(0.53) fl. = 200 ( Waten:ourse Distance, FT) ~ = (Slope,%) I c1 = 1.8(1.1-Cl(D)112 1.8(1.1-0. 73/(200/h1/2 (S)t/J (1)h1/3 I c2 = Concentrated Flow @ 2 fps 56' 2fps I total = E z = 1.2 ( 2-Year. 6-Hour tsopluvial) E 10 = 1.6 ( 10-Year. 6-Hour lsopluvial) E 100 = 2.5 ( 100-Year, 6-Hour lsopluvial) l2 = 7.44 P2 Dre, -011-45 7.44(1.2)(12.42)h(-0.645) l10 = 7.44 P,o Dre, -011-15 7. 44(1.6)(12.42)h(-().645) [ 100 = 7 .44 P 100 Dre, -0.&45 7.44(2.5)(12.42)h(-0.645) SJ.2 = CI A (0. 73)(1. 76 INIHR)(0.34 AC) fJ.10 = C IA = (0. 73)(2.34 INIHR)(0.34 AC) 52 100 = C I A (0. 73)(3.66 INIHR)(0.34 AC) Per San Diego County Hydrology Manual 2003 JN: 16-136 INITIALS: DB DATE: April 7, 2017 0.34 AC 0.73 11.96 MIN 0.46 MIN 12.42 MIN 1.76 IN/HR 2.34 IN/HR 3.66 IN/HR 0.44 CFS 0.58 CFS 0.91 CFS 171 Saxony Road, Suite 213 • Encinitas, CA 92024 • P: 760-436-0660 • F: 760-436-0659 • info@sampoengineering.com DRAINAGE VOLUME CALCULATOR EXISTING BASIN # 1 VOLUME DESCRIPTION: Area = 14,822 SF ~ = (0.90)(% Impervious)+ (C.)(1 -% Impervious) f!.2 = 1.2 ( 2-Year, 6-Hour lsopluvial) f!.100 = 2.5 ( 100-Year, 6-Hour lsopluvial) Per San Diego County Hydrology Manual 2003 Y2 = C P2 A Y ,oo = C P,oo A PROPOSED BASIN # 1 VOLUME DE~CRIPTIQN: 0 &H = 14,822 ~ = (0.90)(% Impervious) + (Cp)(1 -% Impervious) f!.2 = 1.2 ( 2-Year, 6-Hour lsopluvial) f!.100 = 2.5 ( 100-Year, 6-Hour lsopluvial) Per San Diego County Hydrology Manual 2003 Y2 = C P2 A Y,oo = C P100 A ,W = Y 100 PROPOSED · Y 100 EXISITNG & = Total Effective Area of Basins Per Grading Plan YFB = (Ae}(HFREEBOARO DEPTH) Y GRVL = (AE) (HGRAVEI OEPTH)°Assuming 40% Voids· (0.9)(0.39) + (0.51 )(0.39) (0. 66)(0. 1 FT/(14822 SF) (0.66)(0.21 FT/(14822 FT) (0.9)(0.47) + (0.58)(0.53) (0.73)(0. 1 FT}(14822 SF) (0. 73)(0.21 FT}(14822 SF) (2272.2FT)-(2054.3 FT} (136 SF)(1.5 FT) (136 SF)(0. SJ(0.4) V rorAL • JN: 16-136 INITIALS: AO DATE: April 7, 2017 14822 SF 0.66 0.10 FT 0.21 FT 978.3 CF 2054.3 CF 14822 SF 0.73 0.10 FT 0.21 FT 1082.0 CF 2272.2 CF 218 CF 136 SF 204 CF 27 CF 231 CF Detention basins shall be constructed to have a minimuim effective area of 136 sq. ft., constructed with 18 in. min. depth of freeboard, 12" of engineered soil and 6" gravel storage as shown on the Preliminary Grading Plan. Detention volumes as stated above are designed to detain the increase stormwater runoff in the 100-year peak storm event from the new proposed development. Volume Tributary to Basin from Roofs Y 100 = C P100 A(area of roof tributary) (0.95)(0.21 FT/(1098 SF) 219.0 CF ·Flow Through Planters have been sized to detain 231 CF for 100 year event, which exceeds the 218 CF minimuim requirement 171 Saxony Road, Suite 213 • Encinitas, CA 92024 • P: 760-436-0660 • F: 760-436-0659 • info@sampoengineering.com { Cilyof Carlsbad STORM WATER STANDARDS QUESTIONNAIRE Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov E-34 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 (BMPs) 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 concurrently. PROJECT NAME: TYLER STREET RESIDENCES ROJECT ID: CT 201 7-0002/PUD 20 17-0001 ADDRESS: 3337 TYLER STREET, CARLSBAD, CA 92008 APN : 204-070-10,11 The project is (check one): D New Development [ZJ Redevelopment The total proposed disturbed area is: 14,822 ft2 ( 0.34 ) acres The total proposed newly created and/or replaced impervious area is: _6.2.H ft2 ( 0.158 ) 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 _________________ SWQMP #: ________________ _ Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. E-34 Page 1 of 4 REV 02/16 To determine if your project is a "development project", please answer the following question: Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? YES NO 0 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): 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: 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; 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 uidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed 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? YES NO 0 0 0 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): E-34 Page 2 of 4 REV 02/16 To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1 )): 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, and ublic develo ment ro ·ects on ublic or riv ate 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 more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public develo ment ro ·ects on ublic or riv ate 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 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 develo ment ro·ect includes develo ment on an natural slo e that is twent -five ercent or reater. 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 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 freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface used for the trans ortation of automobiles, trucks, motorc cles, 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 of 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from the ro ·ect to the ESA i.e. not comm in led with flows from ad·acent 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 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 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 er da . 10. Is 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 . 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 21.203.040 YES NO D D D D D D D D D D D 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 statin "M ro·ect is a 'STANDARD PROJECT' .. ." and com lete a licant information. E-34 Page 3 of 4 REV 02/16 Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)): Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than 50% of the surface area of the previously existing development? Complete the percent impervious calculation below: Existing impervious area (A) = ____________ sq. ft. Total proposed newly created or replaced impervious area (8) = ____________ sq.ft. Percent impervious area created or replaced (B/A)*100 = _____ % YES NO D D If you answered "yes", the structural BMPs 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 BMP's required for PDP apply to the entire development. Go to step 5, check the check the first box statin "M ro·ect is a PDP ... "and com lete a licant information. D 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. 12] My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT' stormwater requirements 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. D My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual. Applicant Information and Signature Box Applicant Name: ELIZABETH LAGRUA Applicant Signature:. g (,,.,hcft,? ;;t;;_ Applicant Title: _M_A_N_A_G_E_R _________ _ Date: 4/6/2017 • Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their 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 Onlv YES NO City Concurrence: D D By: Date: Project ID: E-34 Page 4 of 4 REV 02/16 ( City of Carlsbad STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Project Name: Tyler Street Residences Project ID: DWG No. or Building Permit No.: 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 BMP Design Manual for information to implement source control BMPs 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 rovided. SC-1 Prevention of Illicit Discharges into the MS4 Discussion/justification if SC-1 not implemented: SC-2 Storm Drain Stenciling or Signage Discussion/justification if SC-2 not implemented: SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal Discussion/justification if SC-3 not implemented: E-36 Page 1 of 4 O Yes 0 No Ill N/A Ill Yes 0 No 0 N/A Revised 03/16 -,i. ' -.~ ·: •• i:, ;~~ ... ~trot.Ranulrement'Jcontfnuedl ..... ~,.. . .i.;:--. .. ,;.t~,t~ -,, ... n4.: ~~&.• ... ilnnlled? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and Ill Yes 0 No 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 121 Yes 0 No 0 N/A 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 Appendix E.1 of BMP Manual for guidance). D On-site storm drain inlets D Yes D No 121 N/A D Interior floor drains and elevator shaft sump pumps D Yes D No Ill N/A D Interior parking garages D Yes D No Ill N/A D Need for future indoor & structural pest control 121 Yes D No 0 NIA D Landscape/Outdoor Pesticide Use 121 Yes 0 No 0 N/A D Pools, spas, ponds, decorative fountains, and other water features D Yes 0 No Ill NIA D Food service D Yes 0 No Ill N/A D Refuse areas D Yes D No Ill N/A D Industrial processes D Yes D No 121 N/A D Outdoor storage of equipment or materials D Yes 0 No 121 N/A D Vehicle and Equipment Cleaning D Yes 0 No 121 N/A D Vehicle/Equipment Repair and Maintenance OYes D No 121 N/A D Fuel Dispensing Areas D Yes 0 No 121 N/A D Loading Docks OYes 0 No 121 N/A D Fire Sprinkler Test Water 121 Yes 0 No ON/A D Miscellaneous Drain or Wash Water D Yes 0 No 121 N/A D Plazas, sidewalks, and parking lots D Yes 0 No Ill N/A For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers. Provide Integrated Pest Management information to owners, lessees, and operators. Maintain landscaping using minimum or no pesticides. Provide a means to drain fire sprinkler test water to the sanitary sewer or approved BMP. E-36 Page 2 of 4 Revised 03/16 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 rovided. Discussion/justification if SD-1 not implemented: SD-2 Conserve Natural Areas, Soils, and Ve etation 0 Yes O No 0 NIA Discussion/justification if SD-2 not implemented: SD-3 Minimize Im ervious Area 0 Yes O No O N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Com action 0 Yes 0 No ON/A Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion 0 Yes 0 No D N/A Discussion/justification if SD-5 not implemented: E-36 Page 3 of 4 Revised 03/16 SD-6 Runoff Collection 0 Yes D No D N/A Discussion/justification if SD-6 not implemented: SD-7 Landsca in with Native or Drou ht Tolerant S ecies 0 Yes D No D N/A Discussion/justification if SD-7 not implemented: D Yes D No 0 N/A Discussion/justification if SD-8 not implemented: E-36 Page 4 of 4 Revised 03/16 10.0 . r-.... .... ~ ... ' ' 11111111 11111111 0.3 puraUon . 11111111111111111 I I 111111111111111 1111111111111 zo 1.0 111111 lntenslfy-Duratlon ~Igo Chart -Template o,~s for: Appllcation:. (1) S:rom precipitation maps determine 6 hr and 24 hr amounts for.the·selected frequency. Thei.e maps-are 1ndude~ in the County HydrologyManual {10, 50, anq 100 yr maps 'includ~ in the··Oesign and Procec:fu~·Manual). ~ · (2) Adjust 6 tv pre<;ipitatioo Of ~ssary) sq that It is within the range of 45% to 65% of the 24 hr precipitation (not- appllcaple to ~rt). (3) Plot 6 hr pj'eci~tiO.n 011 ~ right ~d~ of1he chart. (4) Draw.a line through the point_paraltel 1Q the plotted lines. (~) Thi' r~. ~-the· inter,sity-d~~tion ~rve for tl')e location bein_g·a~lyz~; Applf~lon fonn: (a) S~lected ~eJlCY ..1.QQ_ year, (b) Ps = 2.5, 'in., p24 = ~'PPs = 59 %<2> · · 24. (9) AdJustE!d P6()) = --2.:.5. in. (d) fx =-~.mi_n. (e) _I= ~ in.Jhr. No~~: ll)js.chart reptac;es 1he ll).l~n.$1ty-O,uration-Frequency curves used since 1965. I I P6 t 1.S 2 2.5 3 u ,. u 5. 5.5 I s Durallon I I I I l r I I I I I I Ii 2:63 3.95 5:27 &.5& 7.90 9.22 10.5.4 ·11.86 13.17 1-4A9 15.8J 7 2.12 3.1~ 4.24 5.30 8.38 7,"2 8.48 964 10.60 .11.66 1.2-72 10 1.08 2.53 3.37 4.21 ·5.05 5;80 8.74· 1.58 .._8.42 . 9.27 10.11 15 . 1 '1ft 1.95 2.59 3.24 3.88 4.54 5.'19· ·s.84 6AS 7.13 7.78 20 1.08 1.82 2.-:15 2.89 3.23 3.T-T 4.31 4.85 5.39 5.93 .§....4\ 25 na-1 1,40 U7 2.33 2.IID 3.27 3.73 4.20 4.67 ~13 5.60 30 0.83 1.24 1.66 2.01 2.49 2~llll 3.32. 3.73 4..15 4.56 4.98 4.0 0.811-1.03 -1.38 1:72 2.07 2.41 2.76 · .3, 1.0 3.45" 3.79 4,13• 50 0.60 0.90 1.19 r.49' 1.79 2.09 2'.39 2.69 2.98. 3.28 I 3.58 80 OAA 0.80 1.06' t.33 1,58 1.86 2;12 -2:39 z.ss 2.921 3.18 90 0.4t 0.6-t 0.82 f.ll2 1.23 1.43 f.63 1.84 2.04 2.25 2.45 121 0.34 O.St O.BIJ 0.86 f.02 1,19 1.36 1.53 1.70 1.87 2.04 150 '().29 0.44 0.58 0.73 0.88 1.0.3 1.1& 1.32 f.47 f,62 t.76 1• Q.26 0.39 0.52 0.65 0.78 0.91 1.()4. 1.11t 1.31 1.44 t.57 7M 0.22 0;~ 0.43 0.54. 0.65 0.76 nR? 0.96 t 1.04 1,19 t.30 300 0.19 0.28 0.38 0.47-0..56 o.ee ();7$ 0.85 0.94 1.03 1.13 3IO 0.17 0.25 0.33 0."2 0.50 0..51! 0.67 0.75 I. 0.84. ·0.92 1.00 SAN DIEGO COUNTY HYDROLO GY MANUAL ,-1 t:; w u. ~- 11.1 0 ! ~ B w Yi :,. ~ ~ 3:: EXAMPLE: Given: Watercourse 'Olstance (D) = 70 Feet S1ope (s)•1.~% Runoff Coefficient (C) = 0:41 Overland Flow Time (T) = 9.5 Minutes T = 1.8.(1 .1-C) Yo 'Vs $OURCE: Airport Drainage, Federal Aviation Administration. 1965 Rational Formura -Overland Time of Flow Nomograph SAN DIEGO COUNTY HYDROLOGY MANUAL FIGURE I 3-3 I ·-· San Diego County Hydrology ~ual Date: June 2003 Table3-1 Section: Page: RUNOFF COEFFICIENTS FOR URBAN AREAS Land Use Runoff Coefficient "C" Soil Type NRCS Elements Coun Elements %IMPER. A B Undisturbed Natural Terrain (Natural) Permanent Open Space o• 0.20 0.25 Low Density Residential (LDR) Residential, 1.0 DU/A or less 10 0.27 0.32 Low Density Residentia"i (LDR) Residential, 2.0 DU/A or less 20 0.34 0.38 Low Density Residential (LDR) Residential, 2.9 DU/A or less 25 0.38 0.41 M~ium Density Residential (MDR) Residential, 4 .3 DU/ A or less 30. 0.41 0.45 Medium Density Residential (MDR) Residential, 7.3 DU/A or less ACTUAL 40 EXIST. 0.48 0.51 Medium Density Reside.ntial (MDR) Residential, 10.9 DU/A or less 45 0.52 0.54 Medium Density Residential (MDR) Residential,.14.5 DU/A or less 47% 50 PROP. 0.55 0.58 High Density Residential (HDR) Residential, 24.0 DU/A or less 24DU/A 65 0.66 0.67 High Density Residential (HOR) Residential, 43.0 DU/A or less 80 0.76 0.77 CommerciaI/Industrial (N. Com) Neighborhood Commercial 80 0.76 0.77 Commercial/Industrial (G. Com) General Commercial 85 0.80 0.80 Commercial/Industrial (O.P. Com) Office Professiona:VCommercial 90 0.83 0.84 Commercial/Industrial (Limited I.) Limited Industrial 90 0.83 0.84 Commercial/Industrial General I. General Industrial 95 0.87 0.87 C 0.30 0.36 0.42 0.45 0.48 o .. 54 0.57 0.60 0.69 0.78 0.78 0.81 0.84 0.84 0.87 3 6 of26 D 0.35 0.41 0.46 . 0.49 0.52 0.57 0.60 0.63 0.71 0.79 0.79 0.82 0.85 0.85 0.87 *The values associated with 0% impervious may be used for direct calculation of the nmoff coefficient as described in Section 3 .I .2 (representing the pervious runoff coefficient, Cp, for the soil type), or for areas that will remain undisturbed in perpetuity. Justification must be given that the area will remain natural forever ( e.g., the area is located in Cleveland National Forest). DU/ A = dwelling units per acre NRCS = National Resources Conservation Service "nunty w .' •'.. ; I ' ; ;-~ I .• • i > ' l ' ; . • ; I '-+-H-+'-,'-;-t-,. 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