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1955 Francis res21-0217 Water Retention 9.28.21_1Yi rL�ar � Comp. By: Scott 1 Date: 9!1512 �l rss5� Public Works Department City of Atlantic Beach Permit No: Address: Required Storage Volume Criteria: Section 24-66 of the City of Atlantic Beach's Zoning, Subdivsion, and Land Development Regulations requires that stormwater runoff from impervious areas be stored onsite. Volume to be retained is as follows: V = CARM 2 which is the Modified Rational Method for estimating stormwater runoff Where: V = Volume of Runoff to be stored (cubic feet) C = Runoff Coefficient, 0.92, the difference between impervious area (C=1.0) and undeveloped conditions (C=0.08). A = Impervious Area (square feet) R= 25 -yr / 24 -hr rainfall depth (9.3 inches for Atlantic Beach) Onsite Storage Volume Required for Impervious Area: Lot Area = 7,568 ft2 Impervious Area (A) = 2,597 ft2 = 34.3% V = 0.92 x 2,597.0 x V = 1,852 W Provided Storage: Area 1 - Relative Elev. Area Storage (ft) tft2) (ft3) 414 BOTTOM w., TOB Area 2 - Relative Elev. Area Storage (ft) (ft2) (ft) 0 BOTTOM L" 0 TOB Area 3 - Relative Elev. Area Storage (ft) (ft) (ft3) 0.1-- 0 BOTTOM 0.0 0 TOB 9.3 / 12 Sideslope: :1 size: X size: X size: size: size: 0 size: J Inground Storage: = A*dlpf Total Storage Area at TOB (A) = 957.0 ft2 Depth to ESHWT from BOTTOM (d) = 4.0 ft, default is 2.0 ft, verify onsite ESHWT Pore Factor (pf) = 0.4 default is 0.4 Inground Storage Provided = 1531.2 ft3 Required Treatment Volume = 1,852 ft3 Supplied Treatment Volume = 1,945 ft3 Retention Francis 1955 9/15/2021 L- FE Ca E—=" M 21 J XL M& PROPOSED Ua SWALE '124) if lZi '! r,iIE mw,;Vo — aIMVOSED DAIA.NAGE '1-0x - Q ro,jNo kiimk;wnvFr 112- -R.:,I, -jrf Tf EX15EN(; !)RAWAM 1,0. "Al A}{' MEN SQ9w%&r1m. 51_MIOARI — - - --- — lJ I I /.I- IW. R01 j, 9 811'1 AID) .00 ,D) FK-SENG ELL-11ON 1T6.00 MV 'D AGE., INLET JU -ROPOSEP ELFVA^,% MOVE 2 11 INATIEN .1 I'MIN." RAM, [,IVATD-. 2V IF—I WE 15' 'KE 10 BE REMOVED A V, 11 �;Ali 5 1 1 to : WAR 2W If. -, I 1.04- IV P-V"7D CrIll Digitally signed by LEGAL DESCRIPTION M • 01 E. M—�T. A�. III lll* �ff� nCP Il4 MA. IME CIVIL & SURVEYING, LLC ft Z 311 G-rA"rM RC)AD 18 _. aHbr`USEI A -F. V! If. ST AUGUSTINE, FLORIDA 32084 I t �1 Z� izi —M -0"Osri N COVERED '.[A Licensed Survey Business w8139 Certificate of Authorization -33025 *TM (S NOT A SOMMY SURVEY. DRAINAGE NOTES 1. ALL STMIXTUMB AIM CDMCRM 11A11S 9 ON ARE PROPOSED, 2. Dmwnm Am wwam or smmmm CMM K ALIENED 0~ CMBIMXIM & SILT Ma M ME MISTALLED MOM FRUMT PUMEM AND MANTANED rdROLAMW Iff DIRA70H OF MWSMAWK 4. THESS MARRED FM ROMAL *M1 BE FMACEP, W NMM N A=RPAWCE TO QVMM MY OF ATLAMM BEACH REGULATOM 5. Amy wjrWWS OWL WE METALLED IN 7M 9" A MAN131t THAT FOLLOWS PREDVIAMMOIT IMMOMTEM Dvd=M IL AMY COMM MOVES AND STOOPS 01ALL K RAPED AT NIL IS AWAY FROM MXrJW- AT TiME Mommm Mon. OF TME PORW AND STOW. M rift I. ELMIM MM SHALL K 4 NKHM 7.MMLIND ELPIAMMIS AT MNWATM MALL WE IME 6 00*3 BELOW rMMW rU)OR ELEVA10M 2. ELEVAIMMM MEM30M MOM AMMAN 1[MAL MATEO (MAW) THEE IL DPW nELD MOU00 11LOPIS STUM MAN &I 94ALL K SODOM IL nom nmm TD w k%L ir Aww wrw tmAum of Ltyr PER coi mmM a -m -it 11. MVOMM DWELLM TO K CMJECM) TO MLMMA1. WATER. 4-- TO qrq a. - T. A- Irl) 41 r,, * f,- . (1(1(, 8" 21 J XL M& PROPOSED Ua SWALE '124) lZi T,AIV - Tf "Al A}{' MEN SQ9w%&r1m. 51_MIOARI — - - --- — AID) .00 ,D) 12-L— 1T6.00 MV 'D AGE., INLET A, MOVE 2 11 INATIEN .1 13 1 4,XI 16 2V IF—I WE 15' IWAL VPIRNAC�l Mf- 1 �5'71 5 1 1 to : WAR 2W IA 1 SCAB RA Digitally signed by LEGAL DESCRIPTION M Brandon Shugart PE 01 E. M—�T. A�. III lll* �ff� nCP Il4 MA. IME CIVIL & SURVEYING, LLC W;00 State of Z 311 G-rA"rM RC)AD 18 Florida 7A P ST AUGUSTINE, FLORIDA 32084 I t �1 Z� WVVVV.1MIECIV1L-.00fA —M 1714-42®-77"64 DRAINAGE NOTES 1. ALL STMIXTUMB AIM CDMCRM 11A11S 9 ON ARE PROPOSED, 2. Dmwnm Am wwam or smmmm CMM K ALIENED 0~ CMBIMXIM & SILT Ma M ME MISTALLED MOM FRUMT PUMEM AND MANTANED rdROLAMW Iff DIRA70H OF MWSMAWK 4. THESS MARRED FM ROMAL *M1 BE FMACEP, W NMM N A=RPAWCE TO QVMM MY OF ATLAMM BEACH REGULATOM 5. Amy wjrWWS OWL WE METALLED IN 7M 9" A MAN131t THAT FOLLOWS PREDVIAMMOIT IMMOMTEM Dvd=M IL AMY COMM MOVES AND STOOPS 01ALL K RAPED AT NIL IS AWAY FROM MXrJW- AT TiME Mommm Mon. OF TME PORW AND STOW. M rift I. ELMIM MM SHALL K 4 NKHM 7.MMLIND ELPIAMMIS AT MNWATM MALL WE IME 6 00*3 BELOW rMMW rU)OR ELEVA10M 2. ELEVAIMMM MEM30M MOM AMMAN 1[MAL MATEO (MAW) THEE IL DPW nELD MOU00 11LOPIS STUM MAN &I 94ALL K SODOM IL nom nmm TD w k%L ir Aww wrw tmAum of Ltyr PER coi mmM a -m -it 11. MVOMM DWELLM TO K CMJECM) TO MLMMA1. WATER. 4-- TO qrq a. - T. A- Irl) 41 r,, * f,- . (1(1(, 8" (133) LU 21 J XL Proportion PROPOSED Ua SWALE '124) lZi T,AIV - Tf "Al A}{' MEN SQ9w%&r1m. 51_MIOARI — - - --- — AID) .00 ,D) 12-L— 1T6.00 MV 'D AGE., RS -2 FROM PROPERTY APPRA13EWS A, MOVE 2 11 INATIEN .1 13 1 4,XI 16 2V IF—I WE 15' IWAL VPIRNAC�l Mf- 1 �5'71 5 1 1 to : WAR 2W IA 1 SCAB RA Digitally signed by LEGAL DESCRIPTION Brandon Shugart PE 01 E. M—�T. A�. III lll* �ff� nCP Il4 MA. IME CIVIL & SURVEYING, LLC W;00 State of -5— �— A, wi,l,l A� 311 G-rA"rM RC)AD 18 Florida _1 . I— I »ARI IV 1.". -1.-1A 1• xuRerD ST AUGUSTINE, FLORIDA 32084 I t �1 Z� WVVVV.1MIECIV1L-.00fA .04 1714-42®-77"64 Licensed Survey Business w8139 Certificate of Authorization -33025 *TM (S NOT A SOMMY SURVEY. (133) LU DRAWING / CLIENT If ORMATION / WFICATIM QE ;^'ROPR R T 11,/Vl I ff- 1it XL Proportion T,AIV — I. r t._KW& I; 2W $LMH —1 2 11 INATIEN .1 IA 1 SCAB RA 19 it S.AS M GRAPHIC SCALK 1 Inch r(. DRAWING / CLIENT If ORMATION / WFICATIM QE ;^'ROPR R T 11,/Vl I ff- 1it XL Proportion 2D q?T e # 077811 a ALF ALPHA SOUTHEAST, INC. NA 2670 ROSSELLE AVE— SUITE 8 SOME JACKSONVILLE, FL 32204 C'IVa<$ CCNB'TFM.DCTION MANAGEMENT PRo 06I0NAL EVALUATION OF GROUNDWATER TABLE AT 1955 Francis Avenue Atlantic Beach, FL 32233 The purpose of the exploration was to collect information concerning the subsurface groundwater conditions near the proposed retention area. The evaluation was performed using a 5ft hand -auger. The hand -auger boring was performed at the location shown in the exhibit below. Boring Location R The initial boring was completed on Monday, September 13, 2021 at 3p. The boring was terminated at 5' below existing ground. Water was found at 4'8" below existing grade. The boring was checked on Tuesday, September 14, 2021 at 1p. At time of check 2" of water was found at bottom of hole. It is anticipated the Seasonal High Groundwater Elevation in the area will normally be at 4' feet below the existing ground at the boring location. Respectfully submitted, ��111 1i 1111'f 'f// ALPHA SOUTHEAST, INC. FL C.A. 29643 ��.• �G E N S^ �. F . Digitally,j,k1a y No. 84559 • O ; 2 Reynold D. Reynold o-Pketson Date: 202T -.09d• Peterson 13:47:59-C 5000— O STATE OF 00 4 ,-T • Reynold D. Peterson P.E. �i F '0.0•j0 Sr Project Manager ��isS/ONAi FL PE NO 84559