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PLAN
-PAVEMENT DIMENSIONS, DRAINAGE & GRADING
SOIL TEST DATA
DATE: APRIL 12, 1999
RIM
EXCAVATOR: BORTOLOTTI CONSTRUCTION
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B.O.H. AGENT:
FROM O
LEN.
STRUCTURE
ENGINEER: D.
OJALA, DOWN CAPE ENGINEERING
TO
m
LOCATION: TH1
"N •
LOCATION: F� i2
STCT.
ELEV. DEPTH
ELEV. DEPTH
24.20
20.0 0.0
20.2 0.0
Ap - LOAMY SAND 19.4 0.8
Ap - LOAMY SAND
19.0 1.0
LT1
CB1->CB2
65
B - LOAMY SAND
23.40
17.50
B -LOAMY SAND
W
AP
17.0 3.0
CB2->MH1
17.2 3.0
CB3
2230
17.50
LT4 T5
C1 - M/C SAND 16,2 4,0
AP
C1 - M/C SAND
C83->MH2
100
10% GRAVEL
23.20
PERC 24 GAL 6.5 MIN
LT6 T7
WARAP
9.7 10.5
LT7
CB4->CB7
9.0 11.0 1
C65
21.50
BOTTOM
LT4
BOTTOM
NO GROUNDWATER
LT4
NO GROUNDWATER
44
LL
LOCATION: TH4
17.50
CB6
ELEV. DEPTH
LOCATION: T
20.4 0.0
f1
U
C86
21.50
17.50
FILL
ELEV. DEPTH
AP
LT6
LOAM/METAL/WOOD
.17.3 0.0
16.9 3.5
'
C85
2' LOAM
C1 - M/C SAND
0
CB7
SAND
17.50
LT7
W
13.8 3.5
SHEET
2
OF
4
18.00
MH3
FILL
STUMPS/CARS/WIRE
17.50
CB8
RUBBLE/STUMPS 11.4 9.0
CB8
20.50
18.00
CB7
BOTTOM
10.3 7.0
C1 - M/C SAND
NO GROUNDWATER
17.50
8.8 8.5
LT3
MH1->MH2
60
BOTTOM
2270
17.50
LT3 T5
NO GROUNDWATER
LOCATION: TH6
LOCATION:
18.00
MH3
ELEV. DEPTH
ELEV. DEPTH
17.5 0.0
MH3
2230
16.20
FlLL
16.3 0.0LOAM/CEMENT
do ASPHALT
15.6 0.7
- LOAMY SAND
RUBBLE
18'->FES1
8 - LOAMY SAND
METAL
14.3 2.0
C1 - M/C SAND
12.5 5.0
C1 - M/C SAND
9.3 7.0
BOTTOM 8.5 9.0
NO GROUNDWATER
BOTTOM
NO GROUNDWATER
LOCATION: TH7
ELEV. DEPTH
•
26.6 0.0
25.9 0.7
A - SANDY LOAM
B- SANDY LOAM
24.1 2.5
23.4 3.2
C1 - M/C SAND
10% GRAVEL
PERC 24GAL IN 7.8 MIN
16.6 10.0
BOTTOM
''nn��
NOTE:
NO GROUNDWATER
_...,,
}O
1. ORG. LOAM (TOPSOIL)
MAY BE STRIPPED, STOCKPILED AND RE -USED AS PLANTING
SOIL FOR LAWNS PROVIDED IT IS PROCESSED TO MEET THE REQUIREMENTS OF THE
SPECIFICATIONS.
2. LOAMY SAND OR
LOAMY SAND AND GRAVEL (SUBSOIL) SHALL BE REMOVED FROM
TO 3 FT BELOW PAVEMENT AND BELOW AND 10' LATERALLY FROM DRAINAGE
STRUCTURES TO ITS MAXIMUM DEPTH. LOAMY SAND AND
GRAVEL MAY BE USED
FOR FILL OUTSIDE
OF THE PAVEMENT AREA.
3. MEDIUM SAND MAY
BE USED AS FILL IN ALL AREAS.
4. ALL EXCESS SOIL MATERIALS SHALL BE REMOVED FROM SITE.
22
21
Z20
f� 19
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w17
16
15
SLOPE 5:1 MAX
TO EXISTING GRADE
NOTES:
1. STONE FOR THIS STRUCTURE SHALL BE DURABLE BROKEN
ROCK WITH A SIX INCH MIN. DIMENSION. EACH STONE
SHALL WEIGH NOT LESS THAN 15 POUNDS NOR MORE
THAN 75 POUNDS. AT LEAST 75% OF THE VOLUME SHALL
CONSIST OF STONES WEIGHING NOT LESS THAN 50 POUNDS EACH.
C.I. FRAME AND COVER
SCHEDULE OF ELEVATIONS
STORMWATER MANAGEMENT COMPLIANCE DATA:
STANDARD j/1: No discharge of stormwater to wetlands
The destination of runoff form the portion of this site to be affected by construction is
vegetated wetland bordering on drainage ditched and cranberry bog drainage systems, and
ultimately, Lewis Bay.
Treatment of stormwater runoff from impervious areas prior to discharge is required.
STANDARD #2: Post development peak runoff rates must not exceed pre -development runoff
rates.
Town of Yarmouth Regulations require recharge of 100% of stormwater runoff generated on
site during a 25yr storm. Therefor, the peak rate of runoff will remain approximately the
some or less than pre -development conditions from storms with a return frequency of 25
years or less. The 100yr storm will likely be accompanied by coastal flooding to the margins
of the proposed parking area.
STANDARD #3: Loss of annual recharge
The proposed drainage system will infiltrate all runoff from storms with a return frequency of
25yr of less. The recharge capacity of the drainage system is therefor greater than required to
meet this standard.
STANDARD #4: TSS removal
This project will incorporate water quality inlets at each of the infiltration units to be placed
under the pavement of the proposed parking area.
Each infiltration unit consisting of a stone trench 4.8' wide and four foot deep is considered
equivalent to an infiltration basin yielding on 80% TSS removal. Pretreatment in water
quality inlets is considered to provide 25 % removal of TSS.
EFFECTIVE TSS REMOVAL: 859
STANDARD #9 Operation and Maintenance Plan
Maintenance of this drainage system will include annual inspection of each catch basin, and
periodic removal of accumulated sediments when the level of accumulation is within one foot
of the outlet trap.
In addition, the overflow basin (FES1) will be annually inspected and sediments removed as
required.
Drainage inlets will be kept free of leaves and debris which would decrease inlet capacity.
The parking lot will be swept fee of sand and debris annually after the last snowfall.
F,'Hir" f RAIN I INK FFN( f
REMOVE ANY UNSUITABLE MATERIALS AND REPLACE WITH CLEAN
SAND AND GRAVEL TO AT LEAST 10 FT LATERALLY FROM THE
LIMITS OF THIS STRUCTURE. (SEE TH3)
DETAIL - FLARED END SECTION ES1
RIM
12' PIPE
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TO
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Z
TRENCH
STCT.
W
c=n
C81
24.20
17.50
LT1
W
AP
LT1
CB1->CB2
65
C82
23.40
17.50
LTt T2
W
AP
LT2
CB2->MH1
100
CB3
2230
17.50
LT4 T5
W
AP
LT5
C83->MH2
100
C84
23.20
17.50
LT6 T7
WARAP
t5
LT7
CB4->CB7
100
C65
21.50
17.50
LT4
W
AP
LT4
C65->CB3
44
LL
17.50
CB6
f1
U
C86
21.50
17.50
LT6
W
AP
LT6
C86 ->C84
67
17.50
C85
0
CB7
21.80
17.50
LT7
W
AP
SHEET
2
OF
4
18.00
MH3
17.50
CB8
CB8
20.50
18.00
CB7
MHt
24.10
17.50
LT2 T3
LT3
MH1->MH2
60
MH2
2270
17.50
LT3 T5
18.00
MH3
MH3
2230
16.20
MH2 CB6
15.30
18'->FES1
STORMWATER MANAGEMENT COMPLIANCE DATA:
STANDARD j/1: No discharge of stormwater to wetlands
The destination of runoff form the portion of this site to be affected by construction is
vegetated wetland bordering on drainage ditched and cranberry bog drainage systems, and
ultimately, Lewis Bay.
Treatment of stormwater runoff from impervious areas prior to discharge is required.
STANDARD #2: Post development peak runoff rates must not exceed pre -development runoff
rates.
Town of Yarmouth Regulations require recharge of 100% of stormwater runoff generated on
site during a 25yr storm. Therefor, the peak rate of runoff will remain approximately the
some or less than pre -development conditions from storms with a return frequency of 25
years or less. The 100yr storm will likely be accompanied by coastal flooding to the margins
of the proposed parking area.
STANDARD #3: Loss of annual recharge
The proposed drainage system will infiltrate all runoff from storms with a return frequency of
25yr of less. The recharge capacity of the drainage system is therefor greater than required to
meet this standard.
STANDARD #4: TSS removal
This project will incorporate water quality inlets at each of the infiltration units to be placed
under the pavement of the proposed parking area.
Each infiltration unit consisting of a stone trench 4.8' wide and four foot deep is considered
equivalent to an infiltration basin yielding on 80% TSS removal. Pretreatment in water
quality inlets is considered to provide 25 % removal of TSS.
EFFECTIVE TSS REMOVAL: 859
STANDARD #9 Operation and Maintenance Plan
Maintenance of this drainage system will include annual inspection of each catch basin, and
periodic removal of accumulated sediments when the level of accumulation is within one foot
of the outlet trap.
In addition, the overflow basin (FES1) will be annually inspected and sediments removed as
required.
Drainage inlets will be kept free of leaves and debris which would decrease inlet capacity.
The parking lot will be swept fee of sand and debris annually after the last snowfall.
F,'Hir" f RAIN I INK FFN( f
REMOVE ANY UNSUITABLE MATERIALS AND REPLACE WITH CLEAN
SAND AND GRAVEL TO AT LEAST 10 FT LATERALLY FROM THE
LIMITS OF THIS STRUCTURE. (SEE TH3)
DETAIL - FLARED END SECTION ES1
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99-034
SHEET
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DCT JOB NO. 99-031