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Home My WebLink AboutCD 2017-0013; THE BEACON; DRAINAGE REPORT; 2019-02-14raSmith CREATIVITY BEYOND ENGINEERING Drainage Report MAt< U 7 S CD 2017-0013, DWG 510-4A, GR 2018-0008 for Beacon 7720-7750 Camino Real Carlsbad, California 92009 Project No. CD2017-0013 Drawing No. 510-4A RASN Project No. 3160389 Date: February 14, 2019 RECORD-C~~~~~ \ ~,~✓£ > \ 1 n itia \ Date_---··· -· ____ ...... ... Beacon Drainage Report Drainage Report (Hydrology report) FOR Beacon 7720-7750 Camino Real Carlsbad, California 92009 Prepared for: AG-CP La Costa Owner, LP. c/o Linwood Real Estate, Inc. 1640 Fifth Street, Suite 101 Santa Monica, CA 90401 Prepared by: raSmith 8881 Research Drive, Irvine, CA 92618 Phone: (949) 872-2378 Fax: (949) 387-3915 Web: rasmith.com Preparation Date February 14, 2019 2/14/2019 Beacon Drainage Report Section I. Section I. Section II. Section 111 . Section IV. Table 1: Section V. Table 2: Section VI . Table 3: Section VI I. Table 4: Section VI 11 . Section IX. 2/14/2019 Table of Contents Table of Contents ........................................................................................................... 2 Executive Summary ....................................................................................................... 3 Project Description ......................................................................................................... 3 Methodology .................................................................................................................... 3 Runoff Coefficients ........................................................................................................... 4 Existing Conditions ......................................................................................................... 5 Existing Land Use ............................................................................................................. 5 Proposed Conditions ...................................................................................................... 5 Proposed Land Use Analysis ............................................................................................ 5 Hydro logic and Hydraulic Results ................................................................................ 6 Summary ofResults .......................................................................................................... 6 Declaration of Responsible Charge ............................................................................. 7 List of Attachments ......................................................................................................... 8 Attachment A: Vicinity Map Attachment B: Ex. & Pr. Hydrologic Maps Attachment C: Hydrology Spreadsheet (Rational Method) Attachment D: lsopluvial Map Attachment E: Hydrologic Soil Group Map Attachment F: HGL Calculations 2 Beacon Drainage Report Section II. 1/2/2019 Executive Summary The project has been designed to meet current requirements for all new storm drain proposed for the project site. The existing system has also been analyzed and overland flow paths for overflows have been designed into the project. Section Ill. Project Description The Beacon project consists of re-facing existing buildings per building plans, refreshing landscaping, and reconfiguring the parking lot. The parking lot work involves creation and/or replacement of over 33,000 sf of impervious area within the project area. Generally the parking lot will be configured to fit within boundary conditions of the existing parking area. One Driveway will be removed, and one driveway will be reconfigured. The total parcel area (combined) is 682,193 sf. The project area is 177,825 sf. The SWQMP area is 33,181 sf. The existing impervious area is 136,488 sf (23% of the 177,825 sf project area) whereas the proposed impervious area is 135,242 sf (24%). Generally, the site drains from west to east, towards El Camino Real. The existing site has a full-developed storm drain system with inlets, and storm drain, which is being augmented with the proposed construction, not removed. The proposed inlets and improvements are proposed to discharge to this existing system prior to discharge into the public system which carries stormwater across El Camino Real. Section IV. Methodology The Hydrologic and Hydraulic calculations are based on the guidelines given in the Drainage Design Standards chapter of the City of Carlsbad Design Standards and Standard Drawings. An analysis was based on a 100-Year, 6-Hour Rainfall Event per San Diego County Hydrology Manual June 2003. Per the Rational Method in the San Diego County Hydrology Manual, the modified rational methodology was used in determining the site discharge and runoff (Section 3, Page 3): Q=CIA. Where: Q is in units of CFS, Area is in units of acres., and where C is a unit-less coefficient representing the relationship of runoff based on soil and cover factors: C = 0.90 x (% Impervious)+ Cr x ( 1 -% Impervious) Where: Cr = Pervious Coefficient Runoff Value for the soil type (shown in Table 3-1 as Undisturbed Natural Terrain/Pcmianent Open Space, 0% Impervious). Soil type can be determined from the soil type map provided in Appendix A. Reviewing Table 3-1 , the runoff coefficient (Cp) can be found: 3 Beacon Drainage Report 2/14/2019 Reviewing Table 3-1 , the runoff coefficient (C) of 0.85 is utilized based on a type "D" soil with commercial land uses. Table 1: Runoff Coefficients San Diego Counly Hydrology Manual Dale: June 2003 Table 3-1 Section. Page: RUNOFF COEFFICIENTS FOR URBAN AREAS I.and U11< RunolT Cocllicienl ·,·· SollT·- NRCS Elements Countv Elemenb. •~. IMPER. A B tJndi.iurbcd Narural Ten-ain (Nat11n1lt Pcnnancnl ~ Space o• 0.20 0.25 Low O.nslly Rcs1drn1tal (LOR) Rtsidtn11al. 1.0 DU/A or less 10 0.27 0.32 Low O.ru,ty Rcs1dcn11al (LDR) Rcsid,'llUal. 2.0 DU/A or lo,s 20 0.34 0.3~ Low Density R<sidcnltal (I !)Rt Rc,idcnrial, 2.9 DU/A or lcs, 25 0 Jk 041 Medium Dens11y Residential (MDR) Re,iden1ial. 4.3 DU.A or ies, )0 0 41 0.45 McdnuTI lkn111y Rrnden1ial (MOR) Rc,idenlial, 7.3 DU.'A or lcs, 40 0.48 0.51 Medium l)cns1ty Rcsidcn11al (MOR) Rcsidcnual, I 0,9 DU· A or less 45 0.52 0.54 ~◄.-d,urn Denmy Residential (MOR) Residential. 14.5 DU1A or le~ so 0.55 0.Sk High O.n,ily Rcsidcn1ml (HllR) R«idenl1al. 24.0 DU1A or let\.< <,5 0 66 0 67 1111,>ti Dcn,ily Residcnnol I IIDR) Rtsidcniial. 43.0 DLIIA or le"' 80 0.76 0.77 C'ommcmalllndu.stnal (N. ('omt Ncight•ortiood Commercial 80 0 76 077 C'onun,moVll\dustnal {G. Com) G,neral C'ommercial ~5 O.KO 0.MO I Commcmal/Jndumial •O.P. C-onil Office Proft'ssional'Commcrcial 90 0.8) 0.114 Commc,nol~Rdu,trial (Lim1t<d I ) L1mi1cd Industrial 90 0 83 0 K4 Commcrc1al/lndu.slnal IOt'.ncrlll I.\ Gientral Jndu.stri&I 95 0.87 0.87 C 0.)0 0.36 0.42 0.45 0.4R 0.54 0.57 0.60 0.(,9 o.n tl.78 0.kl 0.84 0.k4 0.M7 3 6oC26 D 0.35 0 41 0.46 0 49 0.52 0.57 0.60 0.63 071 0_7q 0.79 0.Rl 0.85 0.85 0.87 I •The values 1s..wciu.ted with cri. ,mpcrvmus may be used for direct calcuhltion of the runoff cocftic1cn1 ftJ dcM:ribc:d in Section 3.1.2 trc:prcswting the" pcrv1ow runoff coeJlicicm. Cp. ronh~ .soil type). 01 for arc.a!! th.1.1 will n:rnam undi!lturbcd in perpetuity. Ju~tificauon mu.."t tw given 1hat the area will rL-main na1ural rorc.-vcr (e.g .. the are». i• located in Cleveland Na11onal Fore.it DU/A dwelling unil~ jlCf a ... Te NRCS = National ResourC'eJ Cnnscrva11nn Set'\'1cC" Additionally, the storm intensity of a 6 hour storm is based on the following equation given the following equation I = 7.44 p 6 o-0·1145 Where: adjus1ed 6-hour slonn rainfall amoun1 (see discussion below) D duration in minu1cs (use Tc) The P6 intensity of 2.5 in of the P6 storm using the isopluvial maps (See Attachment "C"). The site soil classification is hydrologic soil type D per NCRS mapping. (See Attachment "D"). An analysis was based on a Continuous Rainfall Event per San Diego County for BMPs, and a 100-year analysis for storm drain sizing. 4 Beacon Drainage Report 2/14/2019 Hydrologic calculations were performed using a spreadsheet based on the San Diego County Hydrology Manual (2003). The hydrology calculations for proposed and existing conditions may be found within the hydrology calculations section of this report. Section V. Existing Conditions The site soil classification is hydrologic soil type D per NCRS. The far-north OMA which is not being altered (maintenance only improvements}, the North drainage area and the South drainage area. Both areas consist of existing buildings, parking, associated infrastructure, and driveways to El Camino Real. The North area drains from east to west and drains to El Camino via a storm drain that is aligned under the driveway (non- signalized). The South area has a similar east to west drainage pattern, but with less storm drainage infrastructure. T bl 2 E . . L d U. a e xzstmK an se EXISTING NORTH SOUTH TOTAL{SF) 99,598 26,405 PERVIOUS {SF) 7,258 7% 4,485 17% IMPERVIOUS (SF) 92,340 93% 21,920 83% Q(cfs) 12.97 3.22 Section VI. Proposed Conditions The proposed site is a commercial site with parking lots and buildings. The site is being redeveloped and as a part of the work, a driveway is being removed and converted into pedestrian space. Additional patios are also being constructed. The parking lot is undergoing minor realignments and reconfigurations including curbing. The realigned parking lot has been designed to incorporate biofiltration devices (with underdrain and liners) to accommodate the Priority Development classification for water quality. As a part of the sizing for the filters, Continuous modeling has been completed to show compliance with hydromodification restrictions (see SWQMP prepared by raSmith dated January 2019. T bl 3 a e p ropose an se natvszs dL dU. A I . PROPOSED NORTH SOUTH TOTAL (SF) 99,598 26,405 PERVIOUS {SF) 8,258 8% 4,961 19% IMPERVIOUS (SF) 91,340 92% 21,444 81% Q (cfs) 12.89 -0.62% 3.18 -1.24% As the site is predominantly remaining as-is, the flow paths of the larger areas, slope , and the surface of the flow path is remaining constant; therefore the Tc is constant from existing and 5 Beacon Drainage Report 2/14/2019 proposed. As the overall impervious area is decreasing, both runoff peak flows is reduced compared to existing conditions. All drainage in the north basin will utilize existing inlets on existing flow paths, except as modified to meet water quality goals, whereby stormwater will flow through the biofiltration planters prior to overflow discharge to inlets. New pedestrian areas will drain to small diameter inlets/storm drain prior to discharge to planters and the existing storm drain system. The south basin will utilize existing flow paths prior to curb inlets at the signalized driveway that is being altered. Section VII. Hydrologic and Hydraulic Results Hydrologic calculations were performed using a spreadsheet based on the San Diego County Hydrology Manual (2003). The hydrology calculations for proposed and existing conditions may be found within the hydrology calculations section of this report. The project area predominantly drains through a storm drain within the driveway that is to be removed. The storm drain and tributary area to the north is not affected, and the south driveway does not have an existing storm drain. The 'North' drainage area (centered around the north driveway along El Camino); the 'South' drainage area centered around the south driveway (signalized) along El Camino; and the individual inlet areas within the WQMP area have been analyzed for performance within the 100- year, 6-hour storm. As shown in the tabular analysis, the proposed small diameter storm drain area sized to accommodate the 100-year rainfall. As shown in the tabular analysis, the existing 18-inch storm drain in the 'North' drainage area is undersized. The overflow route (max 6" ponding) that is located below building openings is provided for passage of the 100-year storm (see hydrology exhibit, HX-3, for overflow path). Table 4: Summary of Results SUMMARY AREA Q CHANGE (SF) (cfs) NORTH 99,598 12.97 EXISTING SOUTH 26,405 3.22 NORTH 99,598 12.89 -0.62% PROPOSE[ SOUTH 26,405 3.18 -1.24% The HGL calculations for the portion of the storm drain under the pedestrian plaza replacing the north (unsignalized) driveway has also been reviewed, and is presented on the project construction plans. Additionally, HGL Cales are also provided herein. Within the HGL analysis, 6 Beacon Drainage Report 2/14/2019 the downstream HGL (at the connection), was set 1-foot below the finish surface at the property line where the existing line enters the right-of way (49.93). Section VIII. Declaration of Responsible Charge Project Name: The Beacon Project ID: CD2017-0013 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. V Enginee of Work's Signature, PE umber & Expiration Date Samuel J. Jacoby Print Name raSmith Company 7 Beacon Drainage Report Section IX. List of Attachments Attachment A: Vicinity Map Attachment B: Ex. & Pr. Hydrologic Maps Attachment C: Hydrology Spreadsheet (Rational Method) Attachment D: lsopluvial Map Attachment E: Hydrologic Soil Group Map Attachment F: HGL Calculations 2/14/2019 8 Beacon Drainage Report Attachment A: PROJECT VICINITY MAP VICINITY MAP CITY OF OCEANSIDE 78 PACIFIC Project Site CITY OF ENCINITAS Vicinity Map NOT TO SCALE 2/14/2019 Attachment A-1 Beacon Drainage Report Attachment B: 2/14/2019 Ex. & Pr. Hydrologic Maps Attachment BA-1 Beacon Drainage Report Attachment C: 2/14/2019 Hydrology Spreadsheet (Rational Method) Attachment C-1 II s ■ 8881 ·•-«ho,;~ 8881 Research Drive Irvine.CA 926 I 8 ; ra mit h ,N;,._ CA.,., .... ,,. Phone: (949)-872-2378 (949) 872-2378 Fax: (949)-387-3915 CREATIVITY aETOND ENGINEERING rasmith.com )JOB NAME: BEACON -EL CAMINO & LA COSTA, CARLSBAD, CA JOB NO: 3160389 HYDROLOGIC CALCULATIONS l DAPTED FROM SAN DIEGO COUNTY HYDROLOGY MANUAL csc 12/29/2018 .J SAN DIEGO COUNTY SJJ 12/29/2018 HYDROLOGY MANUAL 2.5 IN = P6, 100 YEAR RAINFALL PAGE 1 OF 1 ,., I PIPE HYDRAULICS r NAME/CONCENTRATION DRAINAGE AREA NAME AREA AREA (ACRES) SOIL DEV. Tt Ai TC I C Cp Q(TOTAL) FLOW PATH SLOPE HYDRAULICS AND PIPE SLOPE n VEL. POINT SF SU8AREA TOTAL TYPE TYPE MIN % MIN IN/HR Table 3-1 Table 3-1 LENGTH {FT) FT/FT NOTES DIA{IN) FT/FT FPS r PROPOSED -N4 1 --D COMM 90% 5 6.59 0.85 0.85 ' I 7 0.485 5q 0.005 6 o.ooc; 0.013 2.026 ' 1 PROPOSED -N3 1 --D COMM 90% 5.49 6.20 0.85 0.85 7 0.485 59 0.005 6 0.005 0.013 2.026 PROPOSED -N2 1 651.00 0.01 0.01 D COMM 90% 5.97 5.87 0.85 0.85 O.D7 Q=0.07cap=2.03 T 1 0.40c 59 0.005 UK f; n_on5 0.013 2.026 r PROPOSED -52 SQ 408.00 0.01 0.01 D COMM 90% 5 6.59 0.85 0.85 0.05 Q=0.05cap=2.19 I 0.449 59 o.noc; UK 3 0.0147 0.013 2.189 PROPOSED -110 DMA3 5,245.5 0.12 0.12 D COMM 90% 5 6.59 0.85 0.85 0.67 Q=0.67cap=3.68 'l I 0.267 CQ 0.005 OK 6 0.01cc: 0.013 3.681 .1 PROPOSED -100 DMA3 --D COMM 90% 5 6.59 0.85 0.85 -. I 0.139 59 o.ooc; 12 0.0243 0.013 7.090 PROPOSED -101 DMA2 7,676 0.18 0.18 D COMM 90% 5 6.59 0.85 0.85 0.99 Q=0.99cap=9.04 ·I I o.1na 59 o.ooc; OK 12 0.039<; 0.013 9.040 I PROPOSED -101A DMA2 --D COMM 90% 5.11 6.50 0.85 0.85 1 0.138 50 0.005 12 0.0244 0.013 7.105 PROPOSED -103 DMAl 16,403.00 0.38 0.38 D COMM 90% 5 6.59 0.85 0.85 2.11 Q=2.llcap=l2.l ... l 0.081 59 o.om, OK R 0.1216 0.013 12.104 l PROPOSED -102 DMA l --D COMM 90% 5.08 6.52 0.85 0.85 -I o_c;f:;7 5q 0.005 8 0.0025 0.013 1.736 PROPOSED -43 DMAl --D COMM 90% 5.65 6.09 0.85 0.85 ·-I n~ ~ n_-,11 .. 1'J OJi2qf; 0.013 7.826 1 PROPOSED -130C DMA4 --D COMM 90% 5 6.59 0.85 0.85 J 7 n _4oc co 0 "'" ·1; n_ .... nc 0.013 2.026 PROPOSED -130B DMA4 --D COMM 90% 5.49 6.20 0.85 0.85 . -I n_AOC co n_nnc f; n_nnc 0.013 2.026 I PROPOSED -BOA DMA4 592.00 0.01 0.01 D COMM 90% 5.97 5.87 0.85 0.85 0.07 Q=0.07cap=2.03 ... I n.4oc c;q n.nnc OK f; n_nnc 0.013 2.026 PROPOSED -121 DMA4 1,045.00 0.02 0.02 D COMM 90% 5 6.59 0.85 0.85 0.13 Q=0.13cap=2.03 I n_4oc ... q n.~Ull.. OK 7; n_nni:;: 0.013 2.026 1 PROPOSED -133 DMA4 3,205.00 0.07 0.07 D COMM 90% 5 6.59 0.85 0.85 0.41 Q=0.41cap=2.03 j 1 n.4oc <;Q n_m, ... OK I: n _nnc 0.013 2.026 PROPOSED -132 DMA4 --D COMM 90% 5.49 6.20 0.85 0.85 1 n:,tR co n_,u, .. 7; n _nnc 0.013 2.026 , PROPOSED -131 DMA4 -D COMM 90% 5.97 5.87 0.85 0.85 ' ,f 1 ri.4~ co n_nnc 7; n_nn<e 0.013 2.026 PROPOSED -130 DMA4 --D COMM 90% 6.46 5.59 0.85 0.85 l n _4oc' ca n_nnc 7; n _nnc 0.013 2.026 I I PROPOSED -120 DMA4 --D COMM 90% 6.94 5.33 0.85 0.85 I I ~ ca n_nm, I: n_nc: 0.013 6.407 EXISTING NORTH 99,598.00 2.29 2.29 D COMM 93% 5 6.59 0.86 0.35 12.97 Q=l2.97cap=4.21 I n _..,.,., ca n_nnc;;;: --bad--,o n _nnc 0.013 4.215 1 EXISTING SOUTH 26,405.00 0.61 0.61 D COMM 83% 5 6.59 0.81 0.35 3.22 I I -PROPOSED NORTH 99,598.00 2.29 2.29 D COMM 92% 5 6.59 0.86 0.35 12.89 Q=12.89cap=4.21 I ~ <ea n_nnc --bad--10 n _nnc o.on 4.215 l PROPOSED SOUTH 26,405.00 0.61 0.61 D COM M 81% 5 6.59 0.80 0.35 3.18 p I r .. .. Beacon 2/14/2019 ,,,. Drainage Report .. ... ..... Attachment D: lsopluvial Map "" ' ... ,. ' .. "" ... ,. .. ... """ ... ... ... \. "" '-' ,. ~ ,. """ JIii \. ,. ~ ,,,. 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'i'I ic' b.' / Rainfall lsopluvials 100 Year Rainfall Event-6 Hours lsopluvlal Onchos) I s :c P12-~ (r. = z.s") L-0~ c,.,J C-(io ·} DPW GIS _.,N,fo_ ~«.llit:A¥1'.MVIP__,.n SffiGIS \X1c H3,·~ San I >iqto Cc"·cmi! N T>18MAPISPRCMOEOWllllOUTWNIRANTYO,NrflQND.Emt!AEXPRESS OR IMPUED. INCWDINO. IIUT Har IJMlffD TO, TH! U'UED WIJUWfflU * OF MEACIWITAlllllTY AHO FITNE.88 l'ORAPARTICUINI PUAPOeE ~8ton011 AIAlohlo-Tlllt..--, ___ IIOIIANDAG~ W E ="'1...=.,-=~-11o...--.......... Tha~mqoonWn,,,,_....,, .... ,,_.~-,...._.,._._..,i,y,_--.....,. s 3 o 3 Milas Beacon Drainage Report Attachment E: 2/14/2019 Hydrologic Soil Group Map Attachment E-1 33' S'll"N 33" 4'47N Hydrologic Soil Group-San Diego County Area, California (beacon -HSG map) Map Scale: 1:3,600 f prirttd on A portrat (8.5" X 11") sheet. N ----=====--------========Meiers 0 ~ ~ ~ ~ A ----====--------========N!et 0 1~ ~ 600 00:> Map projedlon: Web Mercator Comer coordinates: WGS84 Edge tics: lJTM Zone llN WGS84 USDA Natural Resources Web Soil Survey National Cooperative Soil Survey .a Conservation Service 3/27/2018 Page 1 of 4 33' S' ll"N 33' 4'47N Hydrologic Soil Group-San Diego County Area, California (beacon -HSG map) MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons D A D AID D B D BID D C D CID D D D Not rated or not available Soil Rating Lines A AID -B -BID C -CID D ,. ~ Not rated or not available Soil Rating Points Cl A Cl AID ■ B ■ BID USDA Natural Resources -,_ Conservation Service C c Cl C/D Cl D C Not rated or not available Water Features Streams and Canals Transportation t-++ _,..,, __,, Rails Interstate Highways US Routes Major Roads Local Roads Background • Aerial Photography Web Soil Survey National Cooperative Soil Survey The soil surveys that comprise your AOI were mapped at 1 :24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: San Diego County Area, California Survey Area Data: Version 12, Sep 13, 2017 Soil map units are labeled (as space allows) for map scales 1 :50,000 or larger. Date(s) aerial images were photographed: Nov 3, 2014-Nov 22,2014 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 3/27/2018 Page 2 of 4 Hydrologic Soil Group-San Diego County Area, California beacon -HSG map Hydrologic Soil Group Map unit symbol Map unit name Rating Acres In AOI Percent of AOI LeD2 Las Flores loamy fine D 11 .6 sand, 9 to 15 percent slopes, eroded PfC Placentia sandy loam, D 0.5 thick surface, 2 to 9 percent slo pes TeF Terrace escarpments 11.7 Totals for Area of Interest 23.8 Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (ND, BID, and C/D). The groups are defined as follows: Group A Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (ND, B/D, or CID), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. USDA Natural Resources -~ Conservation Service Web Soil Survey National Cooperative Soil Survey 48.7% 2.0% 49.3% 100.0% 3/27/2018 Page 3 of 4 Hydrologic Soil Group-San Diego County Area, California Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher USDA Natural Resources :.iiii Conservation Service Web Soil Survey National Cooperative Soil Survey beacon -HSG map 3/27/2018 Page 4 of 4 33" S ll"N 33" 4'47'N 474810 ,: !::l N A K Factor, Whole Soil-San Diego County Area, California (beacon -K map) 474900 474900 47fall 475170 Map Scale: 1:3,600 if printed on A portral (8.5" x 11") sheet. ----====--------========Meters 0 fil 100 200 3'.X) ----===-------======Feet 0 1fil 3'.Xl €W 0C0 Map projection: Web Mertator Comer CXJOl'dinates: WGS84 Edge tics: UTM Zone llN WGS84 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 475'200 475'200 3/27/2018 Page 1 of 3 33" S ll"N 33" 4'47' N Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons D .02 D .05 D .10 D .15 D .17 D .20 D .24 D .28 D .32 D .37 D .43 D .49 D .55 -.64 D Not rated or not available Soil Rating Lines -.02 .05 .10 ,. ti .15 ,. t1 .17 ,. t1 .20 USDA Natural Resources ""~ Conservation Service K Factor, Whole Soil-San Diego County Area, California (beacon -K map) MAP LEGEND .. ti .24 .. ti .28 .. ti .32 .. ti .37 .43 -.49 -.55 -.64 .. ti Not rated or not available Soil Rating Points ■ .02 D .05 C .10 C .15 C .17 C .20 C .24 C .28 C .32 □ .37 C .43 ■ .49 ■ .55 ■ .64 □ Nol rated or not available Water Features Streams and Canals Transportation H-t Rails --Interstate Highways --US Routes Major Roads Local Roads Background -Aerial Photography Web Soil Survey National Cooperative Soil Survey MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: San Diego County Area, California Survey Area Data: Version 12, Sep 13, 2017 Soil map units are labeled (as space allows) for map scales 1 :50,000 or larger. Date(s) aerial images were photographed: Nov 3, 2014-Nov 22,2014 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 3/27/2018 Page 2 of 3 K Factor, Whole Soil-San Diego County Area, California beacon -K map K Factor, Whole Soil Map unit symbol Map unit name Rating Acres In AOI Percent of AOI LeD2 Las Flores loamy fine .28 11.6 sand, 9 to 15 percent slopes, eroded PfC Placentia sandy loam, .28 0.5 thick surface, 2 to 9 percent slo pes TeF Terrace escarpments 11.7 Totals for Area of Interest 23.8 Description Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by water. Factor K is one of six factors used in the Universal Soil Loss Equation (USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the average annual rate of soil loss by sheet and rill erosion in tons per acre per year. The estimates are based primarily on percentage of silt, sand, and organic matter and on soil structure and saturated hydraulic conductivity (Ksat). Values of K range from 0.02 to 0.69. Other factors being equal, the higher the value, the more susceptible the soil is to sheet and rill erosion by water. "Erosion factor Kw (whole soil)" indicates the erodibility of the whole soil. The estimates are modified by the presence of rock fragments. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable) USDA Natural Resources :iiilii Conservation Service Web Soil Survey National Cooperative Soil Survey 48.7% 2.0% 49.3% 100.0% 3/27/2018 Page 3 of 3 Beacon Drainage Report Attachment F: 2/14/2019 HGL Calculations Attachment F-1 iv11~0w-PU1n Project File: sto100.stm Number of lines: 3 Date: 2/17/2019 Storm Sewers v12.00 ---"orm Sewe r --, an u\adon _,,...:1 Station Len 0mg Area Rnoff Area x C Tc Rain Total Cap Vel Pipe Invert Elev HGL Elev Gmd I Rim Elev Line ID coeff (I) flow full Line To Iner Total Iner Total Inlet Syst Size Slope On Up On Up On Up Line (ft) (ac) (ac) (C) (min) (min) (in/hr) (cfs) (cfs) (ft/s) (in) (%) (ft) (ft) (ft) (ft) (ft) (ft) 1 End 6.479 0.00 0.00 0.00 0.00 0.00 0.0 0.4 0.0 12.89 54.77 4.10 24 5.86 47.23 47.61 49.91 49.93 51 .33 57.50 Pipe -(64) 2 1 104.35~ 0.00 0.00 0.00 0.00 0.00 0.0 0.1 0.0 12.89 54.91 5.06 24 5.89 47.61 53.76 49.97 55.05 57.50 59.01 Pipe -(63) 3 2 22.825 0.00 0.00 0.00 0.00 0.00 0.0 0.0 0.0 12.89 41 .81 6.01 24 3.42 53.76 54.54 55.05 55.83 59.01 58.54 Pipe -(62) Project File: sto100.stm Number of lines: 3 Run Date: 2/17/2019 NOTES:Known Qs only ; c = cir e = ellip b = box Storm Sewers v12.00 ydraulic ... G1rae1e Line Coniputation-s -~ts'·' - Line Size Q Downstream Len Upstream Check JL Minor coeff loss Invert HGL Depth Area Vel Vel EGL Sf Invert HGL Depth Area Vel Vel EGL Sf Ave Enrgy elev elev head elev elev elev head elev Sf loss (in) (cfs) (ft) (ft) (ft) (sqft) (ft/s) (ft) (ft) (%) (ft) (ft) (ft) (ft) (sqft) (ft/s) (ft) (ft) (%) (%) (ft) (K) (ft) 1 24 12.89 47.23 49.91 2.00 3.14 4.10 0.26 50.17 0.325 6.479 47.61 49.93 2.00 3.14 4.10 0.26 50.19 0.325 0.325 0.021 0.15 0.04 2 24 12.89 47.61 49.97 2.00 2.14 4.10 0.26 50.23 0.325 104.35 ~53.76 55.05j 1.29** 2.14 6.01 0.56 55.61 0.580 0.452 n/a 0.15 n/a 3 24 12.89 53.76 55.05 1.29* 2.14 6.01 0.56 55.61 0.000 22.825 54.54 55.83 1.29** 2.14 6.01 0.56 56.39 0.000 0.000 n/a 1.00 n/a Project File: sto100.stm l Number of lines: 3 I Run Date: 2/17/2019 Notes:• depth assumed;•• Critical depth.; j-Line contains hyd. jump ; c = cir e = ellip b = box Storm Sewers v12.0I ~ 0 ..... o vin,s ·13 ·Au1 t,g·gg '13 W!tl • L99'££+ ~ BIS UI 9L'£S ·13 'AUi 0 9L'£9 '13 'AUi ~0'69 '13 W!tl • ££8'0 ~+ ~ BIS U) ~9'LV '13 'AUi 0 ~9'LV ·13 'AUi 0S'LS ·13 W!tt • 6L t,'90+0 BIS U) £Z:'LV '13 'AU) ££' ~g '13 'PUJ£> o · oo·oo+o BIS g d > Q) w ... 0 0 (") ,.._ 0 0 (") ,.._ 0 0 ,...: <D 0 0 ,-.: <D 0 0 (0 [\ 0 ~ ~ <D \ "-- 0 0 I.O "' I \ \ l \ \ \ (") ~ ; ( ' ~ g -ci 1 \ \ ' ,:;; ~ It) ~ !.. ~ I\} \ i ~ \ I\ I\\ \ I 1 !\ r--.t-,.. \ i-... ~ 0 0 0 0 I.O m "' st ~ 5 ti "" ~ ~ I It •ti 0 0 (") st 0 (") 0 N 0 0 0 0 (]) 0 co 0 ,.._ 0 <D 0 "' 0 C') 0 N 0 0 g ..c. 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