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CATCH BASIN
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DRAINAGE CALCULATION BASED ON 20 -YR. STORM INTENSITY:
1. 24 -HR. RAINFALL FOR 20 -YR. STORM = 5.5
11
2. RUNOFF DEPTH BASED UPON PAVED AREA = 4.3
3. STORM WATER VOLUME AT FRONT OF BLDG:
V = 1,450 S.F. x (4.3/12)' = 520 CU.FT.
4. STORM WATER VOLUME AT REAR AND SIDE:
V' = 7,415 S.F.-x (4_3/12)' = 2,660 CU.FT.
CATCH BASIN SCHEDULE:
C.B.# A B C D E F
1 8'-6" 8'-0" 2'-0" 12'-6" 25.7' 520 CU.FT.
TOTAL 24 -HR. VOL. AT FRONT OF BLDG.= 520 CU.FT.
2 8'-6" 8'-0" 3'-0" 14'-6" 25.5' 545 "
3 8'-6" 8'-0" 3'-0" 14'-6" 23.0' 545
4 8'-6 81-oft2'-0" 12'-6" 22.2' 520
5 81-6" 8'-0" 2'-0" 12'-6"1 22.5' 520 „
6 8'-6" 81-0112'-011. 12'-6" 24.5' 520 "
TOTAL 24 -HR. VOL.AT REAR & SIDE = 2,650 CU.FT.
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SECTION THRU_RETAINING WALL
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RETAINING WALL SPECIFICATIONS:
1. MINIMUM CONCRETE STRENGTH IN COMPRE:SION = 31000 PSI
2. REINFORCING STEEL SHALL BE ITl ACCORDANCE WITH THE SCHEDULE
BELOW, AND SHALL BE 40,000 PSI YIELD STRENGTH. ALL STEEL
BARS SHALL BE SET 1.5 MINIMUM FROM SURFACE OF CONCRETE.
ALL BARS SHALL BE FREE OF SCALE AT TIME OF INSTALLATION
AND WIRED TOGETHER AT ALL POINTS.
REIP'FORCING STEEL SCHEDULE:
..VERT. #4 @ 36" O.C., HOP.. 04 @ 12" O.C.
"B" #6 @ 12" O.C., " #4 @ 12 O.C.
"C" LONG. #4 c 12" O.C. TRANS. #8 C 12" O.C.
„D„ „ #4 @ 12" O.C., „ #8 @ 12" O.C.
"E" #8 @ 8" O.C. - STOP ALTERNATE BARS AT 2' & 5'
ABOVE TOP OF FOOTING.
TWO #8 BARS AT 4" O.C. IN BASE OF KEY,.
3. PVC SLEEVES FOR FENCE POSTS SHALL INCLUDE A WEEP' HOLE OF
1" MIN DI.Z:!-! . iT BASE OF SLEEVE.
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DETAIL -TYPICAL PAVEMENT SECTION
(N TS)
-T,nr or rr»tJ, yt..Ey,= FIN. fUz• S.LEV. = 26,.50'
- 1=1V) t -AD✓ f-LEv. = 2�0.2� ELEV. = 2Z f
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tFJV. - 23.0 �� G ` 1►.1V. 15.So' 6�� c: Ssor1E
I►JY. = � I ( i lt�Y.= (NOTE
24.ao - 23.17 2' z _ Ax 6' L AT. F, ms 8'x
loan 6AL.56PjiG TANK. Vl5'` 50)<-- EA ' C
Z' LAGN 11JCs GF{Al/.EF_2 �IZEl1C4 _
TOTAL LEA6At06 AMA = 144 s. F•
SECTION
(NTS)
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. : SIDE AREA = 51 S.F.
SIDE LEACH'G.RATE= 2.5 GPD/S.F. : (48'X 1.08')
TOTAL LEACH'G.AREA = 195 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.) +
( 51 S.F.X 2.5 GPD/S.F.) = 272 GPD
NITRATE LOADING CALCULATION:
1. TITLE 5 7EWAGE 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 COVER 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
90 MAIN STREET
WEST. YARMOUTH, MA.
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CH ARON ASSOCIATES, INC:
i� CONSULTING ENGINEERS
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rQl(� 323 N SCK ROAD, ROCHESTER, MA 02770
( DVIG. NO.
SCALE: A S NOTED
-DATE: JANUA25, 1988 .L-2