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DRAINAGE AREA SCHEMATIC
(1"- 20')
_
P`5-3UILi" RETENTION BASIN SCHEDULE:
DRAINAGE CALCULATION BASED ON 20 -YR. STORM INTENSITY: "E" R.B.# A B C D E 24-HR.VOLUME
1. 24 -HR. RAINFALL FOR 20 -YR. STORM = 5.5" 25.z 1 8'=0" 10'-0" 2'-0" 12'-0" 5. 700 CU.FT.
I 11
2. SCS RUNOFF CURVE NUMBERS: PAVED AREAS AND ROOF = 98 r Z6.1 2 8'-0" 101-0" 2'-0" 12'-0" 2 700 "
1 ' LANDSCAPED AREAS = 25 24.,I 3 8'-0" 10'-U 2'-0" 12'-0" 2 700 "
I w
° (USDA SOIL CONSERVATION SERVICE SOIL GROUP "A") Z3,o 4 8'-0" 8'-0" 2'-0" 12' -Or'' 2 0' 460 "
r 3. STORM WATER RUNOFF FOR DESIGN STORM: ►.�/A 5 8'-0" 10'-0" 2'-0" 12'-0" 11 A 700 "
PAVING,AND ROOF: Q = 5.2" 25.0 1
6 8 -0 8 -0 2 -0 12 -0 2 3 460
LANDSCAPED AREAS: Q' = 0.2" % 25.1 7 8'-0" 10'-0" 2'-0" 12'-0" 2 700 "
3. STORM WATER VOLUMES IN RUNOFF AREAS: 8 8'-0" 10'-0 2'-0" 12'-O" 5. 700 "
25,0
AREAS SO. -FT. x RUNOFF DEPTH = RUNOFF VOLUME
"A" 1,925 (PAVED) x (5.2/12) _ 835 CU.FT. TOTAL RETENTION BASIN VOLUME _ - 5,120 CU.FT. +
+2,100 (ROOF) x (5.2/12) 910
+4,000 (L'SCAPED) x (0.2/12) 70 NOTE "A": RETENTION BASINS #1, & 7 SHALL BE 18:" SQ. OR RHD.
LIGHT TRAFFIC, 75 LBS, NON -CLOGGING TYPE FOR USE`IN
TOTAL VOLUME FOR R.B.#1,7,& 8 = 1,815 CU.FT. 11011 -TRAFFIC AREAS ONLY: ALL PRE -CAST PITS SHALL BE
1 H-20 RATED, MODELS #DW8HD & DW10HD BY ROTONDO &
"B" 3,175 (PAVED) x (5.2/12) 1,375 CU.FT. SOi7S,PRECAST PRODUCTS..
1 (TOTAL VOLUME FOR R.B.#2 & 3)
"C" 3,360 (PAVED) x (5.2/12) = 1,455 CU.FT.
(TOTAL VOLUME FOR R.B.#4,5,& 6) .
- TOTAL STORM WATER VOLUME = 4,645 CU.FT.
CHARON ASSOCIATES, INC.
323 Nock Road o11EE1 NO -_ _.�.1 P� 1 .. or Z
ROCHESTER. MASSACHUSETTS 02770 3- b =?S*"
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AT 10'D GENERAL NOTES - SEWAGE DISPOSAL SYSTEM:
1. THIS SYSTEM DOES NOT MAKE PROVISION FOR A GARBAGE GRINDER.
�Z"TpK, I 2. ALL WORK SHALL BE PERFORMED IN ACCORDANCE WITH TITLE 5 AND
Fberr, Vo, E-LEV5 LOCAL BOARD OF HEALTH REGULATIONS.
'A -A'= 3. ALL COMPONENTS SHALL BE INSTALLED ON A LEVEL, STABLE BASE
THAT WILL NOT SETTLE. PIPE SHALL BE LAID ON A FIRM BASE,
AT PRzPER7Y FREE OF STONES. _
(µ1N, 7_4"W, K VP.) ti > 4. REMOVE ALL UNSUITABLE SOILS BELOW THE LEACHING AREA AND TO
To 8f_ I►.1STALLEfl \ / " v A DISTANCE OF 10 FEET ON ALL SIDES, AND REPLACE WITH
O CLEAN, COARSE SAND.
18" I7_" _-30 5. BUILDING SEWER SHALL BE SCH.40 P.V.C.;'EFFLUENT PIPE SHALL
BE SCH.40 P.V.C.
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
SECTION THRU RETAINING WALLS LOADS, AS CERTIFIED BY THE SUPPLIER.
8. EFFLUENT PIPE SHALL BE LAID LEVEL FOR 2 -FT. FROM OUTLET.
(1/2" = �'-O"� _ 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 - 44 S.F.
_ --- SIDE LEACH'G.RATE= 2.5 GPD/S.F. 1
TOTAL LEACH'G.AREA = 188 S.F. '
RETAINING WALL SPECIFICATIONS: DESIGN FLOW RATE (PER TITLE 5) = [(1/3 X 2100 X 75 GPD/MSF) +
1. MINIMUM CONCRETE STRENG'T'H IN COMPRESSION = 3,000 PSI
2. REINFORCING STEEL SHALL, BE IN ACCORDANCE WITH THE SCHEDULE (2I3 X 2100 X 50 GPD/MSF))
= 123 GPD
BELOW. AND SHALL BE 40.000 PSI YIELD STRENGTH. ALL STEEL SYSTE;: CAPACITY = ( 144 S.F.X 1.0 GPD/S.F.) +
BAPS SHALL BE STT 1.5" MTNTMi1M FROM SURFACE OF CONCRETE.
ALL BASS SHALL BE FREE OF SCALE AT TIME OF INSTALLATION ( � S.F.X 2.5 GPD/S.F.) = 254 GPD
AND WIRED TOGETHER AT ALL POINTS. NITRATE LOADING CALCULATION: +
1. TITLE 5 SEWAGE FLOW = 123 GPD.
REINFORCING STEEL SCHEDULE: 2. AVERAGE NITROGEN CONCENTRATION = 25 PPM.
"A" VERT. #4 @ 48" O.C., HOR. #4 @ 18" O.C. 3. (123 GPD X 25 -PPM) / 328= 9.38
If
" Oic., ##4 @ 18" O.C. 4. TOTAL LAWN AREA = NONE. (ALL LANDSCAPED AREAS TO BE
"C" LONG. #4 @ 18" O.C., TRANS. #6 @ 24" O.C. MULCHED OR PLANTED WITH GROUND COVER. SPECIES COMPATIBLE
"D" Is##4 @ 18" O.C.- If#6 @ 24" O.C. WITH LOCAL CONDITIONS, AS APPROVED BY BOARD OF HEALTH)
"E" #,6 @ 8" O.C. - STOP ALTERNATE BARS AT 2' & 5' 5. 0.0
ABOVE TOP OF FOOTING. 6. 9.38 + 0.0 = 9.38
"F'11 TWO #z6 BAPS AT 4" O.C. IN BASE OF KEY. 7. LOT AREA = 21,197 / 43,560 = 0.49 ACRE.
3. PVC SLEEVES FOR FENCE POSTS SHALL INCLUDE A WEEP HOLE OF 8. NITRATE LOADING = (9.38 X 0.275) / 0.49 ACRE = 5.26 PPM.
1" MI17. DIAM. AT BASE; OF SLEEVE.
-ITE W02K GERTrFIGATIorJ'
2 �+Ef EBY GE TIFY THAT ALL SITE rJOJ2K INSTALLED A5 0,= MAIN 10, 1989, HAS
E3EEnJ iKs-rA:LyED 1►J GoAAPLIAOCS WITH APP20VED PLAIDS; FINAL 6t2aor►.6, SITS,
L LAN054-APC VJOt?K•. SHALL SE PI-P_FOR_tED Un1c)eC 501TA13LE WEAT141=12 d0Q1XTI0rJs
A62EEIAEt_Ir WITH T000 OF YACK00TN
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DETAIL -TYPICAL PAVEMENT SECTION
(N TS)
&Tg: foP- VEHICLES AS 5)4ovv0 oAJ 6ITg'rL.01 (SEE - FRT, L- 0,44 D A-5
'i�C I►J
6EIJE2AL t16TC t 12. OF !eAT, L-1, SHALL EP 6046T2Ly-1'Eo �VITW t3A6e /AA76KIAL-
� APOVE wi-rRoOT BIT. PA\JltJ -•r; t A5E /AATEIZIAL. 5 -WALL PE Got/EIS O \V(TN MUL441
To COFFE/?_ 5T2tP.
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"As- uiL_-T
SECTIONS AND, DETAILS
QUICK OIL CHANGE BLDG.
84 MAIN STREET
WEST. YARMOUTH, MA.
CHARON ASSOCIATES, INC.
CONSULTING ENGINEERS
323 NECK ROAD, ROCHESTER, MA 02770
SCALE: AS NOTED DNG. NO.
DATE: AP1=II- ?-3,1196t3. n`
KIEV. 1 : /AA:Y Z5, 19��• ' 2 -
12Ed. Z: JULYl1988
F`EV• 3 AUC . a' t938.
IZEV. 4 L3 6'. 17• I9 �,ir5
>' cv . 5 . SBS. I lo, 1958.
►)ov, 15 I`?5O (FNDN A5-EJUILT
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i;LV• 7; A►CJ, 1989 CITE AS_ eutLT3