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DRAINAGE AREA SCHEMATIC
20')
j RETENTION BASIN SCHEDULE: E 24-HR.VOLUME
1 A B C D
R.B.#-Ott ,l -,t-0 „ 25.5' 700 CU.FT.
DRAINAGE CALCULATION BASED ON 20 -YR. STORM INTENSITY: 8,-0„ 10,-0„ 2'-0" 12'-0" 25.5' 700
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1. 24 -HR. RAINFALL FOR 20 -YR. STORM = 5.5" 2 "
t 3 8'-0" 10'-p„ 2'-0" 12'-0" 24.5' 700 „
2. SCS RUNOFF CURVE NUMBERS: LA2DDCAPEDSAREASAND RO025- 98 8,_p..of g1 -p11 -0" 12'-0" 23.0' 460
4 „
8 1 _0'f 101-010 2 _0 12' -0" PI/A 700
(USDA SOIL CONSERVATION SERVICE SOIL GROUP "A") 5 „
�� 460
6 8'-p„ 8,-0„ 2,_p„ 12 _p 25.3 „
3. STORM WATER RUNOFF FOR DESIGN STORM: / 8,-�, 1u'-0' 2'-0" 12'_0„ 25.5, 700
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PAVING AND ROOF: Q = 5.2„ i00 "
LANDSCAPED AREAS: Q' = 0.2" 8 8'-011 1p' -p" 2'-p" 12'-0" 25.5'
3. STORM WATER VOLUMES IN RUNOFF AREAS: RUNOFF VOLUME TOTAL RETENTION BASIN VOLUPSE = 5,120 CU.FT-
AREAS SQ•FT• x RUNOFF DEPTH _ 835 CU.FT.
„A„ 1,925 (PAVED) x (5.2/12) _ 910 & 7 SHALL BE 18" SQ. OR RND.
"
+2,100 (ROOF) x (5.2/12) - 70it
NOTE "A": RETENTION BASINS #1,
+4,000 (L'SCAPED) x (0.2/12) = LIGHT TRAFFIC, 75 LBS, NON -CLOGGING TYPE FOR USE'ZId
= 5 CU.FT. NON-rRAFFIC AREAS ONLY: ALL PRE -CAST PITS SHALL BE
TOTAL VOLUME FOR R.B.#1,7,& 8 1.81 H-20 RATED,
MODELS #DWBHD & DW10HD BY ROTOPIDO &
1,375 CU.FT. SOUS PRECAST PRODUCTS.
„B„ 3,175 OTAL(VOLUM
(TOE FOR5
R?B1#2 & 3)
= 1,455 CU.FT.
11C" (TOTAL 3,360 (PAVED)
FOR5R2B1#4, 5,& 6)
I TOTAL STORM WATER VOLUME _ 4,645 CU.FT.
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CATCH BASIN
(NTS)
.PIPE
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SECTION THRU RETAINING WALLS
.%
(1/2" = j,_ Q„ )
RETAINING WALL SPECIFICATIONS:
IN COMPRESSION =
3,000 PSI
1. P1II:Z2ILjM CONCRETE STRENGTH
IN ACCORDANCE WITH ` THE SCHEDULE
2 . P.EIIIF OP.CING STEEL SHALL BE
40,000 PSI YIELD STRENGTH. ALL S'rEEL
BELOW, AND SHALL BE
SHALL BE STT 1.5" MINTMtTM FROM SURFACE:
OF LONCRE'I'E.
BAPS
ALL BARS SH; LL PZ FREE OF SCALE AT TIME OF
TNSTALLATIOTI
AND WIRED TOC•E':'HEF, AT ALL PGIIITS .
REINFORCING
-.._{ �' 48" O.C. HOR. #4 @
"18" 0,( --
p ,
+'A" VEFi.
"All
" #5 C 18" O.C., " #4 Q
18" O.C.
"C" LONG. 18" O -C., TRANS. #6
@ 24" O.C.
„D„ 11#4 (1 18" O.C.. #6
@ 24" O.C.
2' & 5'
+E" #6 @ 8" O.C. - STOP ALTERNATE
BARS AT
ABOVE TOP OF FOOTING.
"F" TWO #6 BARS AT 411 O.C. IN BASF:
OF KEY.
SHALL INCLUDE
3. PVC SLEEVES FOR FENCE POSTS •• � I
A WEEP HOLE OF
1" MIN. DIAM. AT BASE OF SLEEVE.
81-fU/AtNOUS Go►Jc-•
GL1,PE Got] �F (��/l�.-I-Y;�G [:-�� I✓;�• �ir•JG, I'� Sr,��A�r- ��lF'`�`
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DETAIL -TYPICAL PAVEMENT SECTION
(N TS)
►;-', A�c;S�vA�( fob E/�1��lar<►JG�( VEH IGLEs RS 5!40�v>J &IJ SITE PL Ate (655 -W. L- I �,A1.1D A5
--- N�oTev to,) GI£IJEr-a t1oTC I)' t? -of !AT. L-1, SPALL EE
�vt'fN ,ASE /DA'(EfZIAL
A5 5+!•'`:.'m" FpOv6 \VI-r400T 5IT• 6A5E /AATCr?-1AL. 5k1ALL P)E '-OvLrli�D WITH MUL64
/n To C,0FFSI?- s- P.
-for G Y Y to rw , e t^.ev T I N , t; l_R • t l✓ E -V • Z (G . SQ
- F43, C BADE r-t..EV. = Z%. �r ELEv = zZ f
;;-GovEfL AT (t�ApE CN -2o t2/a?Eo� 60vE2 AT
&CAPE
77,T,/
MI rJ. I I-. PER FT• -iM,a. 2"0; P'STO►�E wzj
a1A Go'DIA.-)INIV. (NOTE# 5)E�,_15.004X t3'''
loon GA.L.SEPj1G TA04 p15i: BOX gym°
12 x t Z LEAeg tNG G A//�BEZ fiZEllcy
TOTAL LEA44)M& AREA = 18& 5• F.
SECTION
(NTS)
A1 ; 'KE/AO11r- AO► DM5ort-AZLc /AATI r -IAL Ef- oWONyTCU-P Bi5L W L6AGNVI6 ARTA W!J>
jo A vvSTANc6 - of to fT. 60 ILL 5199 AND' RC; -AL VJ'tTL1 CLEAN), GDAf'S` 'SAND
A)^"4
5': &CADfE�j OF SLOPE oN -I-)OV4QPIL1- SIrCE OF LCAC1410Z, t',GA= 20%',
gP�c►_c,L.3r v►;TAnacE o. Zd x f �,U': ?p FT•
GENERAL NOTES - SEWAGE DISPOSAL SYSTEM:
1. THIS SYSTEM DOES NOT MAKE PROVISION FOR A GARBAGE GRINDER.
2. ALL WORK SHALL BE PERFORMED IN ACCORDANCE WITH TITLE 5 AND
LOCAL BOARD OF HEALTH REGULATIONS.
3. ALL COMPONENTS SHALL BE INSTALLED ON A LEVEL, STABLE BASE
THAT WILL NOT SETTLE. PIPE SHALL BE LAID ON A FIRM BASE,
FREE OF STONES.
4. REMOVE ALL UNSUITABLE SOILS BELOW THE LEACHING AREA AND TO
A DISTANCE OF 10 FEET ON ALL SIDES, AND REPLACE WITH
CLEAN, COARSE SAND
5. BUILDING SEWER SHALL BE SCH.40 P.V.C.;'EFFLUENT PIPE SHALL
BE SCH.40 P.V.C.
6. WASHED STONE AND PEASTONE SHALL BE FREE OF IRON, FINES, &
DUST IN PLACE, WITH LESS THAN 2/10% FINER THAN #200 SIEVE.
7. ALL COMPONENTS SHALL BE CAPABLE OF SUSTAINING H-20 VEHICLE
LOADS, AS CERTIFIED BY THE SUPPLIER.
8. EFFLUENT PIPE SHALL BE LAID LEVEL FOR 2 -FT. FROM OUTLET.
9. "AS -BUILT" CERTIFICATION OF THE INSTALLED SYSTEM IS
REQUIRED TO BE DONE BY THE ENGINEER PRIOR TO BACKFILL.
SYSTEM DESIGN DATA:
PERCOLATION RATE = 2 MIN./INCH 1 BOTTOM AREA = 144 S.F.
BOT.LEACH'G.RATE = 1.0 GPD/S.F. 1 SIDE AREA = 4Q S.F.
SIDE LEACH'G.RATE= 2.5 GPD/S.F. 1 (48'X 0.9Z')
TOTAL LEACH'G.AREA = 188 S.F. '
DESIGN FLOW RATE (PER TITLE 5) = [(1/3 X 2100 X 75 GPD/MSF) +
(2/3 X 2100 X 50 GPD/MSF)]
123 GPD
SYSTEM CAPACITY = ( 144 S.F.X 1.0 GPD/S.F.) +
( 44 S.F.X 2.5 GPD/S.F.) = 254 GPD
NITRATE LOADING CALCULATION:
1. TITLE 5 SEWAGE FLOW = 123 GPD.
2. AVERAGE NITROGEN CONCENTRATION = 25 PPM.
3. (123 GPD X 25 PPM) / 328 = 9.38
4. TOTAL LAWN AREA = NONE. (ALL LANDSCAPED AREAS TO BE
MULCHED OR PLANTED WITH GROUND COVED- SPECIES COMPATIBLE
WITH LOCAL CONDITIONS, AS APPROVED BY BOARD OF HEALTH)
5. 0.0
6. 9.38 + 0.0 9.38
7. LOT AREA = 21,197 / 43,560 = 0.49 ACRE.
8. NITRATE LOADING = (9.38 X 0.275) / 0.49 ACRE = 5.26 PPM.
SECTIONS AND DETAILS
QUICK OIL CHANGE BLDG,.
84 MAIN STREET
WEST. YARMOUTH, MA.
CH ARON ASSOCIATES, INC..
CONSULTING ENGINEERS;
r�
323 NECK ROAD, ROCHESTERITAA 02770.
SCALE: AS NOTED
DATE: A
REV.1 : /AAY Z5, 1988• rG
RE -I.2.;
R.EV, 3'. Av. 198 B•
�E.v. 5: 5'✓PT• Ilo, 198,