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Home My WebLink AboutCDP 16-06; BAPTIE RESIDENCE; HYDROLOGY STUDY; 2016-09-29John P. Strohminger HYDROLOGY STUDY 5070 Carlsbad Boulevard Carlsbad, CA 92008 Baptie Coastal Residence CDP 16-06, DWG 496-3A Prepared for Kenneth & Sandra Baptie P.O. Box 1221 Woodinville, WA 98072 Prepared By: John P. Strohminger Engineering 635 Via Columbia Vista, CA 92081 Date: September 29, 2016 .0 !C-~-& Date TABLE OF CONTENTS 1. Project Description ............................................................................................................. 3 1.1. Existing Condition .................................................................................................. 3 1.2. Proposed Condition ................................................................................................ 3 1.3. Soil Characteristics ................................................................................................. 4 2. Rational Method Description .............................................................................................. 4 3. Hydrology Analysis ............................................................................................................ 5 4. Water Quality ..................................................................................................................... 5 5. Hydromodification .............................................................................................................. 5 6. References .......................................................................................................................... 6 Attachments: 1. Vicinity Map 2. Existing Condition Hydrology Calculations & Exhibit 3. Proposed Condition Hydrology Calculations & Exhibit 4. Stormwater Standards Questionnaire (City Document E-34) 5. Standard Project Requirement Checklist (City Document E-36) 6. Isopluvial Charts, Overland Flow Length & Initial Time of Concentration Table, and Runoff Coefficients for Urban Areas Table 2 1. Project Description This project is a 0.15 acre residential parcel located at 5070 Carlsbad Boulevard in the City of Carlsbad. Carlsbad Boulevard is a public street that connects with Cannon Road to the north and Cerezo Drive to the south. Proposed improvements consist of a single-family detached dwelling unit, driveway, and a series of retaining walls. The proposed improvements and grading will disturb 0.18 acres. The site's APN number is 210-033-09. The legal description is Lot 57 of Map 2696. Attachment 1 shows the Vicinity Map. 1.1. Existing Condition The existing site has a graded pad 7 feet above the elevation of Carlsbad Boulevard. There is an existing landscaped and irrigated 2:1 slope that starts at the right of way and extends west down to the road grade. The site has no structures except for a 6 foot high split-face wall along the rear and south property lines, and a 2 foot high split-face wall with a 4 foot wrought iron fence on top along the front right of way line. There is a 6 foot high vinyl fence along the north property line that is on the neighboring property. No stormwater drains onto the site from any direction. The stormwater runoff from the site drains directly into a small grate at the north west comer of the lot. From there the storm water is conveyed to the west in a small pipe down the slope to a bubbler grate at the toe of the existing slope along Carlsbad Boulevard. Stormwater joins with flows along the east side of the street and flows north into a sump inlet. The existing inlet is along the curb 40 feet north of the subject property. The existing impervious area of the project parcel is 2%. 1.2. Proposed Condition The proposed condition will direct flows around each side the residential structure into a series of planters in the front yard. Flows that are not directed into the planters are in the driveway and will flow through a series of gravel strips. All flows not retained by the planters or gravel strips will join the stormwater in Carlsbad Boulevard and continue on to the existing inlet in the street. As mentioned above the proposed improvements will disturb 0.18 acres. The additional impervious area of the project parcel is 52%. 3 1.3. Soil Characteristics The following soil group definitions come from Technical Release 55 (TR-55) by the United States Department of Agriculture: Group A soils have low runoff potential and high infiltration rates even when thoroughly wetted. They consist chiefly of deep, well to excessively drained sand or gravel and have a high rate of water transmission (greater than 0.30 in/hr). Group B soils have moderate infiltration rates when thoroughly wetted and consist chiefly of moderately deep to deep, moderately well to well drained soils with moderately fine to moderately course textures. These soils have a moderate rate of water transmission (0.15-0.30 in/hr). Group C soils have low infiltration rates when thoroughly wetted and consist chiefly of soils with a layer that impedes downward movement of water and soils with moderately fine to fine texture. These soils have a low rate of water transmission (0.05-0.15 in/hr). Group D soils have high runoff potential. They have very low infiltration rates when thoroughly wetted and consist chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a clay pan or clay layer at or near the surface, and shallow soils over nearly impervious material. These soils have a very low rate of water transmission (0-0.05 in/hr). The conservative approach is assuming Group D soils for the site. 2. Rational Method Description The rational method, as described in the 2003 San Diego County Hydrology Manual, was used to generate surface runoff flows, which were then used to size the drainage facilities. The basic equation: Q = CiA C = runoff coefficient (varies with land use) i = Intensity (in/hr) A = Area (acres) The 6 hour and 24 hour rainfall isopluvial maps are found in the 2003 San Diego County Hydrology Manual. Adjusted P6 calculations can be found on the spreadsheets in Attachments 2 and 3 along with the Rational Method routing calculations. Initial travel time calculations (Ti) are based on the overland flow equation given in Figure 3-3 of the County's Hydrology Manual and is limited to the maximum overland flow length in Table 3-2 of the County's Hydrology Manual. Travel time calculations between nodes are calculated via Manning's equation or by the Kirpich equation as expressed in the County's Hydrology Manual. Travel time values are then entered into the spreadsheet under Tt. Confluences are done by spreadsheet and are labeled by the node number where the confluence occurs. Each outfall point is shown on the existing and proposed condition hydrology exhibits with the flow rate (Q) at that particular location. Attachment 6 contains the pertinent charts and tables referenced above. 4 3. Hydrology Analysis The table below summarizes the pre-and post-construction 100-year flows. The outfall points are shown on the Existing and Proposed Drainage Exhibits included in this report. Description A (ac) Q (cfs) Existing 100-Yr Node #102 0.18 0.3 Total 0.18 0.3 Proposed 100-Yr Node #213 0.18 0.4 Total 0.18 0.4 Table 1 Summary of existing and proposed stormwater runoff. The total pre-development 100 year flow is 0.3 cfs. The total post-development 100 year flow is 0.4 cfs. The additional 0.1 cfs will be mitigated by routing flows through the front-yard planter system as shown on the Proposed Condition drawing. The Analysis and Exhibit for the predevelopment condition is in Attachment 2. The Analysis and Exhibit for the proposed development is in Attachment 3. 4. Water Quality The project is a Standard Development Project per the completed Storm Water Standards Questionnaire (E-34) provided in Attachment 4. The project is therefore not required to submit a Stormwater Quality Management Plan (SWQMP). The project is required to incorporate Source Control and Site Design BMP's. The Standard Project Requirement Checklist (E-36) address these BMP's and is included in Attachment 5. 5. Hydromodification This project is exempt from hydromodification requirements since it is not a Priority Development Project. 5 6. References I. City of Carlsbad Engineering Design Manual by the City of Carlsbad 2. San Diego County Drainage Design Manual by the County of San Diego, May 2005. 3. San Diego County Hydrology Manual by the County of San Diego, June 2003. 4. Urban Hydrology for Small Watersheds TR-55 by the United States Department of Agriculture, June 1986. 5. Low Impact Development Handbook by the County of San Diego, December 31, 2007. 6. Water Quality Control Plan for the San Diego Basin by the California Regional Water Quality Control Board San Diego Region, April 25, 2007. 7. Stormwater Best Management Practice Handbook by California Stormwater Quality Association, September 30, 2004. 6 ATTACHMENT 1 I I I SI ENCINITAS VICINITY MAP NOT TO SC"-1£ VICINITY lJAP I I ATTACHMENT 2 \ \ ~ \ ~ ~ ~ // -~ \ \ X575 \ \ ' \ ' \' \ \ '~ \ \ ~ \ / ' XS// f\O~pO x59_ 4 .,,.,, .,,.,, 0, '-1, 8 l__:94 \ X585 -~ X582 ,,rr, ~ / s / /~ C:\Users\John Strohminger\Dropbox\Engineering and Surveying\Active Jobs\5070 Carlsbad Boulevard\Drawing Files\Hyrdo Existing Condition.dwg, 9/29/2016 10:42:32 AM, CutePDF Writer \. G> ~ ~ O'i ·~ ~ ~ ~ ~ ~ ~ ~ ~/~ ~ ~ 1//~ 1::i' ~ 0 \ LEGEND Item / ode Number Area in Acres -·-·-·-·----- I~ @ / ~ a -~ ......, ~ Q5 ~ ::s: ~ :::5 ~ ~ ~ ~ ~ ~ ~ ~ -~ ~ i; ~ ~ ~ () ~ i::::! "So~ I::: e:.: ~ 1! OAT£: SHEET: HE SHEET 1 OF 1 Prn.rJevt1fopmont Hydrolouy !>070 Carl~had Boulevard, Carlsbad, Ca, 91008, Fobruary ?!:>, .?016, ,John E Strohmingor b)!Jinoerinq Nodes Iner. Total Soi Land C Iner. Total Flow Slope Over-K.irpich Manning Tc Aroa Area I Use C*A C*A Path, '¼1 land Ti Ti min, ac. ac. Gp 1t. Ti, min. min. cum. min 100-101 O.lb 0.16 D n tl.~J o.:i!:i 0.06 0.0S 100 ~3.bO D.D !H) 101~102 0.0:1 0.1B D n 4.~J lUf.> 0.01 O.Ofi 24 O:I ·to.O Total Flow at Node 102 Land Use Designation is Undisturbed Jorrain with Soil lypc I) msultin9 in a I ?unofl Cooff -0 ().~lb lnopluvial Data: Kirpich Formula I. kITTgth in foet Uevation High Elevation Low L inmilos Delta L Tin minutes P6 ~, P24 ,.·, 2.b 4.2 PG/P2-1, 60% 101 to 102 24 57 [j() 0.00455 1 O.i Adjust(->d P6 = 2.5 I Q::::CIA in/hr. Q, els. 4.?.4 0.2 Initial Area 4.?.0 0.3 0.3 CFS Notes ATTACHMENT 3 \~ \~~~/,,_J \)<~ /f \---~ \ /,,,/'/ />/.I/( ~ \I I \ // /'/~/ \ ' \ _,,-- / \~ \ ~' \ \ ' \ \~ "\ \ ' \' \ \ \ \ \ \ /201- :;:/ '\ // /A C:\Users\John Strohminger\Dropbox\Engineering and Surveying\Active Jobs\5070 Carlsbad Boulevard\Drawing Files\Hyrdo Proposed Condition.dwg, 9/29/2016 10:49:16 AM, CutePDF Writer i1/ ~\ \ / c:) / \ s de Number/ /101 \ @ \ \ / ~ ~ :'5 ~ dg 1:5 "t..;;;, ~ a ~ ~ O'i G ~ ~ 1:: (5 )::; ~ ~ ~ .(b ~ ...:::; C'.) §--c:rs c:rs ~ ~ 1:: (5 ~ ~ ~ -~ ~ ~ § '5 ~~ ~ ~ 9) ~ ~ ~ i ~f DATE: SHEET: HP SHEET 1 OF 1 r (f r Post--Oeveloprnent Hydrology !>070 Carlsbad Boulevard, Carlsbad, Ca, 92008, ,July 17, 2016, ,John E Strohminger Engir1"'win~J Nodes Iner. Total Soi Land C Iner. vfotal Flow Slop Over-Kirpich Mannin Tc I Q:::CIA Notes Area Area I Use c•A C*A Path e% land TI g Ti min, in/hr. 0,. cfs. ac. ac. Gp • ft. Ti, min . min. cum. min 201-202 0.05 0.05 D R4.~-l 0.53 0.0::l 0.03 70 1.00 9.6 H.6 4.~12 0.1 Initial Area 202-212 0.02 0.07 D Fl4.~.1 0.53 0.01 0.04 53 1.00 '1.1 10.7 4.03 0.1 Grass swak1 nc~.03, v,a,.83 fps Flow at Node 212 0.1 CFS 210-211 0.03 0.03 D Fl4.3 0.63 0.02 0.02 70 1.00 H.6 9.6 4.32 0. ·t Initial Ama 211-212 0.05 0.08 D H4.3 053 0.0:3 0.04 97 1.00 1.H 11.b 3.8ti O.? Gras:J swafe n::::.03, v,:::.83fps Flow at Nodo 212 0.2 CFS 212~213 0.03 CU8 D FM.3 0.f):l 0.02. 0.'10 35 2.00 0.4 rn.o -1.2·1 0.4 Grass swalo ns::.03, v.-.~1.541ps Total flow at Nooo 213 0.4 CFS Land Use De~ignation is R··4, up to 4 DU/AC. MDH 4.3 with Soil Type D "' a Hunoff Cooff'"' 0SJ lsopluvial Data: P6,= 2.5 Adjusted PG = 2.5 P24 "'" 4.2 P6/P24 60'¼, Channel Report Hydraflow Express Extension for AutoCAOO Civil 30® 200$ by A\ltodesl<, Inc. Thursday, Feb 25 2015 "'"~ .. -<Name> Trapezoidal Highlighted Bottom Width (ft) = 1.00 Depth (ft) = 0.10 Side Slopes (z: 1) = 2.00, 2.00 Q (cfs) = 0.100 Total Depth (ft) = 1.00 Area (sqft) = 0.12 Invert Elev (ft) = 60.00 Velocity (ft/s) = 0.83 Slope(%) = 1.00 Wetted Perim (ft) = 1.45 N-Value = 0.030 Crit Depth, y C (ft) = 0.07 Top Width (ft) = 1.40 Calculations EGL (ft) = 0.11 Compute by: Known Q Known Q (cfs) = 0.10 Elev (ft) Section Depth (ft) 2.00 --,-------,----.,...---------------,-..------,-----....-2.00 61.50 --,------;--------------;----------+-----,..._ 1.50 61.QQ -!·,,,.,.,,,,.~·; .. ,a.-;c,,,·,,c.,.,~c-,.7.!I:-.-, .--------------,------'--------,.,.,·,,·.,, ... ,,,,,,,.,., .... ~"·<- : '-i,, I 1.00 ,· ! ,.,l/(' 60.50 --,----------''•,, .. t.,,..--------,-----.,,.,-¼,''---------0.50 I ~,~. ~-1 ··\_~ 59.50 --'-----------------------'"----~----"-----'---0.50 0 1 2 3 4 5 6 7 Reach (ft) Channel Report Nvof;s 202-2.1 Z 1 Z-/\ -2-IZ- Hydraflow Express Extension for AutoCAD® Clvil 30® 2009 by Autodesk, lnc. Trapezoidal Bottom Width (ft) Side Slopes (z:1) Total Depth (ft) Invert Elev (ft) Slope(%) N-Value Calculations Compute by: Known Q ( cfs) Elev (ft) = 1.00 = 2.00, 2.00 = 1.00 = 50.00 = 2.00 = 0.030 Known Q = 0.30 Section 1 Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth, Ye (ft) Top Width (ft) EGL {ft) Wednesday, Feb 24 2016 = 0.15 = 0.300 = 0.20 = 1.54 = 1.67 = 0.13 = 1.60 = 0.19 Depth (ft) ~ '2.00 ---,------,------,----------------,,-----,-----,...-2.00 51.50 --,----------------;----------------------1.50 i 51.QO _[ •' '' '''" •'"-~,-,\,,-. ----;,-----,---------+-----,---,/i'''''""''·'"·~·••.-,c•.c,•c.o,,s·,,!-1.QQ l ~.""""'? .1} ,p'' ii' 50.50 ---+----~------·," 1----------------.1.,, ...... ~f· ________ 0.50 50.00 --+------------------'''-,~ ... ,., '·~ .,,,__ , -,.,_,..,,_,,.,.,.~-}-.,<-·;-•. ' ,.,..", ·:-·'_. . . ~..,. .... _,._~, ..... ,,! -,c...,...,,,._,-. :~---:~:'::.·;:;'""'' l ... ,.,/"': -,-=··~·-:--·'' --------;------0.00 49.50 ~------'--------------------------'--------'----0.50 0 1 2 3 4 5 6 7 Reach (ft) ATTACHMENT 4 {_ Cilyof Carlsbad STORM WATER STANDARDS QUESTIONNAIRE Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov E-34 I INSTRUCTIONS: 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 uestions, 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 INFORMATION PROJECT NAME: Baptie Coastal Residence PROJECT ID: CDP 16-06 ADDRESS: 5070 Carlsbad Boulevard APN: 210-033-09 The project is (check one): Ill New Development D Redevelopment The total proposed disturbed area is: 7840 ft2 ( 0.18 ) acres The total proposed newly created and/or replaced impervious area is: 3799 ft2 ( 0.087 ) 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 NIA SWQMP#: N/A 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 I STEP1 TO BE COMPLETED FOR ALL PROJECTS ~o 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 building D Ill 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: ; 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; D Ill 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 in D Ill 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? D Ill 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): ~ you answered "no" to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page 2 of4 REV 02/16 STEP3 TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS '"o 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, D 121 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 D GZl 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 is a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and D 121 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 D Ill development project includes development on any natural slope that is twentv-five oercent or areater. 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 D 121 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 D fl! 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 D Ill Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of 200 feet or less from the project to the £SA, or conveyed in a pipe or open channel any distance as an isolated flow from the project to the ESA (i.e. not comminaled 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 repair D fl! 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 D fl! 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 dav. 10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land D Ill 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 D fl! 21.203.040) If you answered "yes" to one or more of the above questions, your project is a POP. 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 POP ... " 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 statina "My project is a 'STANDARD PROJECT' ... • and complete aoolicant information. E-34 Page 3 of4 REV02/16 STEP4 TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP) ONLY ·omplete 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 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. D D Total proposed newly created or replaced impervious area (B) = sq. ft. Percent impervious area created or replaced (B/A)*100 = % 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 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. STEPS CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT 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. Ill 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. ~ote: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations nd 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 210-033-09 Applicant Name: John P. Strohminger Applicant Title: Civil Engineer Applicant Signature: Date: 10/3/2016 * Environmentally Sensltlve 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 (199") 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 (199") 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 YES NO City Concurrence: D D By: Date: Project ID: E-34 Page 4 of 4 REV02/16 ATTACHMENT 5 {_ Cicyof Carlsbad STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Project Information Project Name: Baptie Coastal Residence Project ID: CDP 16-06 DWG No. or Building Permit No.: DWG 496-3A 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 BMP Design Manual (Volume 5 of City Engineering Standards) 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. • "NIA" 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? 1 SC-1 Prevention of Illicit Discharges into the MS4 •Yes ONo D NIA Discussion/justification if SC-1 not implemented: SC-2 Storm Drain Stenciling or Signage •Yes D No D NIA Discussion/justification if SC-2 not implemented: SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind OYes D No • NIA Dispersal Discussion/justification if SC-3 not implemented: E-36 Page 1 of 4 Revised 09/16 Source Control Reaulrement (continued) Aoolled? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and OYes 0 No II N/A Wind Disoersal , Discussion/justification if SC-4 not implemented: I SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal •Yes ONo 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 Aooendix E.1 of BMP Manual for ouidance). O On-site storm drain inlets •Yes ONO 0 NIA O Interior floor drains and elevator shaft sump pumps OYes 0 No • N/A O Interior parking garages •Yes 0 No • N/A O Need for future indoor & structural pest control •Yes ONo 0 N/A O Landscape/Outdoor Pesticide Use •Yes 0 No 0 NIA O Pools, spas, ponds, decorative fountains, and other water features OYes ONO • N/A ,, O Food service OYes ONo • NIA O Refuse areas OYes 0 No • NIA O Industrial processes OYes ONO • NIA O Outdoor storage of equipment or materials OYes 0 No • N/A O Vehicle and Equipment Cleaning OYes ONO • NIA O Vehicle/Equipment Repair and Maintenance OYes ONo a N/A O Fuel Dispensing Areas OYes 0 No • NIA O Loading Docks OYes ONo • N/A o Fire Sprinkler Test Water OYes ONO • N/A O Miscellaneous Drain or Wash Water •Yes 0 No 0 N/A O Plazas, sidewalks and oarkino lots OYes ONo • NIA For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers. ll - E-36 Page 2 of 4 Revised 09/16 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 (Volume 5 of City Engineering Standards} 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. • "NIA" 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. Site Design Requirement I Applied? SD-1 Maintain Natural Drainage Pathwavs and Hvdroloaic Features l D Yes I D No I• NIA Discussion/justification if SD-1 not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation l D Yes I D No I• NIA Discussion/justification if SD-2 not implemented: SD-3 Minimize lmoervious Area I aves I D No ID NIA Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction I OVes I D No I• NIA Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion I aves I D No ID NIA Discussion/justification if SD-5 not implemented: ? E-36 Page 3 of4 Revised 09/16 Site Dulan Reaulrement (continued) I ADDlled? SD-6 Runoff Collection I aJYes I D No ID N/A -Discussion/justification if SD-6 not implemented: I SD-7 Landscaping with Native or Drought Tolerant Species I aJ Yes I D No I D NIA Discussion/justification if SD-7 not implemented: SD-8 Harvesting and Using Precipitation I D Yes I • No I D NIA Discussion/justification if SD-8 not implemented: Part time residence doesn't allow for proper timing to utilize harvested water when it is needed. E-36 Page 4 of 4 Revised 09/16 ATTACHMENT 6 o_ 00 C'd 6§ -!:? -~ g~ • :1 ~ §-CZ) @ ~ ~o ::::: o_ -g, 00 .s ~ §i Cl::: 0~ u -.....,._ $! .....,_. ~ -.., - t! = e :i:: IQ I I ... C .. > ]i [;a;2 > ::, ~ } C ~ ... ~ .. ;,. c:, = --;...,-........ -g lmper;al.Ccunty ~ o. ID ~-~ -'1 -t--= .., . ··--_/.~==--~~~-=-::..:=.t+-:.-=,+:=,;1-;~~t+:=,-=..t-=..1--:i.1-r-.,...., ~ f ;: r-1 ,., 3 1:1·, 91: g . r§ '< y County of San Diego Hydrology Manual • Rainfall lsopluvials l00Year Rainfall Event-24 Hours ••• •• • •• lsoplovlal (klChes) DPW ~-GIS ~-~ ....... .........,..,w.,.,.,."I.,,. N l ... tiW.l'IIIO'G.Ol'llftNCMWl#fN,,HfYO,NH..., lfflM..,.11 f .. _ _..... ............ ,. ___ _ 0P ~ w.JmfrCN~ APMTtCU.NII~ ~---"'--"-'*' llrM ............. ---. ....... ~ ........ E.........,.,.... .... .,..._,...... __ ._ ...... _ .. INolC'W1,. -.............. .__ ................. .. _.._....,..,,.... ....... ...... 3 0 3 MIies P--I 0 0 San Diego County Hydrology Manual Date: June 2003 Section: Page: 3 12 of26 Note that the Initial Time of Concentration should be reflective of the general land-use at the upstream end of a drainage basin. A single lot with an area of two or less acres does not have a significant effect wpere the drainage basin area is 20 to 600 acres. Table 3-2 provides limits of the length (Maximum Length (LM)) of sheet flow to be used in hydrology studies. Initial Ti values based on average C values for the Land Use Element are also included. These values can be used in planning and design applications as described below. Exceptions may be approved by the ''Regulating Agency" when submitted with a. detailed study. N ~ tv1 /\A-€ (8 '6 .. t:;, /0 ::: C, .. ~ Ti - Table 3-2 ~ ~ ·' MAXIMUM OVERLAND FLOW LENG' r,H (LM) & INITIAL TIME OF CONCENTRATii )N (T1) , Element* DU/ .5% 1% 2% 3% 5% 10% Acre LM Ti LM Ti LM Ti LM Ti LM Ti LM Ti vNa~ 50 13.2 70 12.5 85 10.9 100 lcfo.3: 100 1(8) 100 6.9 -- LDR l 50 12.2 70 11.5 85 10.0 100 9.5 100 8.0 100 6.4 LDR 2· 50 11.3 70 10.5 85 9.2 100 8.8 100 7.4 · 100 5.8 LDR 2.9 50 10.7 70 10.0 85 8.8 95 8.1 100 7.0 100 5.6 ~R) 4.3 50 10.2 70 (ii 80 8.1 95 7.8 100 6.7 100 5.3 ---:MDR 7.3 50 9.2 65 8.4 80 7.4 95 7.0 100 6.0 100 4.8 MDR 10.9 50 8.7 65 7.9 80 6.9 90 6.4 100 5.7 100 4.5 MDR 14.5 50 8.2 65 7.4 80 6.5 90 6.0 100 5.4 100 4.3 HDR 24 50 6.7 65 6.1 75 5.1 90 4.9 95 4.3 100 3.5 HDR 43 50 5.3 65 4.7 75 4.0 85 3.8 95 3.4 100 2.7 N.Com 50 5.3 60 4.5 75 4.0 85 3.8 95 3.4 100 2.7 G.Com I 50 4.7 60 4.1 75 3.6 85 3.4 90 2.9 100 2.4 0.P./Com 50 4.2 60 3.7 70 ·3.1 80 2.9 90 2.6 100 2.2 Limited I. 50 4.2 60 3.7 70 3.1 80 2.9 90 2.6 100 2.2 ' General I. 50 3.7 60 3.2 70 2.7 80 2.6 90 2.3 100 1.9 *See Table 3-1 for more detailed description 3-12 () San Diego County Hydrology Manual Date: June 2003 0 Section: Page: Table 3-1 RUNOFF COEFFICIENTS FOR URBAN AREAS Land Use I Runoff Coefficient "C" Soil T:me . NRCS Elements Coun Elements %IMPER. A B Undisturbed Natural Terrain (Natural~ Pennanent O2en S2ace O* 0.20 0.25 Low Density Residential (LDR) Residential, 1.0 DU/ A or less 10 0.27 0.32 Low Density Residential (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 Medium 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 40 0.48 0.51 Medium Density Residential (MDR) Residential, 10. 9 DU/ A or less 45 0.52 0.54 Medium Density Residential (MDR) Residential, 14.5 DU/A or less 50 0.55 0.58 High Density Residential (HDR) Residential, 24.0 DU/ A or less 65 0.66 0.67 High Density Residential (HDR) Residential, 43.0 DU/A or less 80 0.76 0.77 Commercial/Industrial (N. Com) Neighborhood Commercial 80 0.76 0.77 Commercial/Industrial (G. Com) General Commercial 85 0.80 0.80 Commerciatnndustrial (O.P. Com) Office Professional/Commercial 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 0.54 0.57 0.60 0.69 0.'.78 0.78 0.81 0.84 0.84 0.87 3 6of26 D 0 ~ ffle_-J0tr 0.41 0.46 0.49 @ ~ ;1ftp(50QJ 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 runoff coefficient as described in Section 3.1.2 (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 3-6 ) \ )