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PLAN VIEW
LOAM &! SEED
VGEOGRID (ISI 14,000 or TENSAR BX1100)
COMPACTED FILL
— 4 OZ.. FILTER FABRIC:
— STONE BACKFILL
STORMTECFb SC -310 CHAMBER (OR EQUAL)
Z- 12" INLET
—MIN. ONE FOOT OF 1. 1/2 " -2" CRUSHED
TO BE PLACED. AROUND PERIMETER OF
INFILTRATOR CHAMBERS
se ®t ® ,_
WASHED, CRUSHED STONE
BENEATH CHAMBER SYSTEM
10 FEET-
(2 UNITS WIDE)
. yr
�14 FE
(TUNITS�W'IDE)
12 INLET
FOR REGISTRY OF DEEDS USE ONLY
LOAM & SEED
GEOGRID (ISI 14,000 or TENSAR BX1 100)
COMPACTED FILL
- 4 OZ. FILTER FABRIC
STONE BACKFILL
STORMTECH,SC -310 CHAMBER (OR EQUAL)
CROSS SECTION
COMPACTED, WELL GRADED GRANULAR BACKFILL (PER INFILTRATOR
SYSTEMS' REQUIREMENTS) WHICH CONTAIN AN EVEN DISTRIBUTION OF
PARTICLE SIZES WITH NO MORE THAN 10% FINES (PARTICLES PASSING
4" OBSERVATION WELL THE # 200 SIEVE) RANGING FROM SILT THROUGH SAND TO GRAVEL
(HIN. OF 957 OF THE MODIFIED PROCTOR DENSITY)
4 OZ. FILTER FABRIC �
1 1/2" - 2" -
WASHED, CRUSHED STONE
COMPACT BASE TO A MIN. OF 95% OF
THE MODIFIED PROCTOR DENSITY
2'± (TYP.)
34" — +III -®- -6 0MIN
ELEV.= 191.0±
I ELEV.= 189.83
6"
f
ELEV.= 188.00
6" REMOVE EXISTING LOAMYlSILTY SAND
— TO ELEVATION 186.0 AN OO REPLACE
WITH COARSE SAND.
ELEV.= 186.00
NOTE:
ELEV =188.70
ALL FILL TO BE IN
CONFORMANCE WITH
310 CMR
15.255(3),
PROPOSED
INFILTRATION
AREA
"A"
(10' X 25')
N,T,S
CROSS SECTION
25'
COMPACTED, WELL GRADED GRANULAR BACKFILL (PER INFILTRATOR
SYSTEMS' REQUIREMENTS) WHICH CONTAIN AN EVEN DISTRIBUTION OF
PARTICLE SIZES WITH NO MORE THAN 107 FINES (PARTICLES PASSING
4" OBSERVATION WELL THE # 200 SIEVE) RANGING FROM SILT THROUGH SAND TO GRAVEL
<MIN. OF 95% OF THE MODIFIED PROCTOR DENSITY)
4 OZ. FILTER FABRIC
ELEV.= 189.7±
1 1/2" - 2 " \j'...,
ELEV =188.70
WASHED, CRUSHED STONE
�B _6•�
T
i 0
I
— MIN. ONE FOOT OF 1 1/2" -2" CRUSHED
TO BE PLACED AROUND PERIMETER OF ���
16'
INFILTRATOR CHAMBERS
# ELEV.= 186.70
COMPACT F F
MODIFIED PROCTOR THE
\j\
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/� ,�/
/
— 6" LAYER OF 1 1/2" - 2"
12" REMOVE EXISTING FINE SANDY LOAM
WASHED, CRUSHED STONE
TO ELEVATION 184.0 AND REPLACE
WITH COARSE SAND.
BENEATH CHAMBER SYSTEM
ELEV. =18490
2'± (TYP.)
34"
6 "MIN
NOTE:
ALL FILL TO BE IN CONFORMANCE WITH 310 CMR 15.255(3).
PROPOSED INFILTRATION AREA 11 B"
"THIS PLAN IS SUBJECT TO A COVENANT DATED -----------
"THIS PLAN IS SUBJECT TO A CERTIFICATE OF ACTION DATED --
"THIS PLAN IS SUBJECT TO A SPECIAL PERMIT DATED --------
I,_____________ __________ _ _ _ __, CLERK OF THE
TOWN OF LEXINGTON, MASSACHUSETTS HEREBY CERTIFY THAT
THE NOTICE OF APPROVAL OF THIS PLAN BY THE LEXINGTON
PLANNING BOARD HAS BEEN RECEIVED AND RECORDED AT
THIS OFFICE AND NO NOTICE OF APPEAL WAS RECEIVED
DURING THE TWENTY DAYS NEXT AFTER SUCH RECEIPT AND
RECORDING OF SAID NOTICE.
TOWN CLERK DATE
m
(14' X 6 5 )
N,T.S
APPROVED BY:
LEXINGTON PLANNING BOARD
DA TE
10'
, Ei'
1
N
d
11' -0'
PLAN VIEW ._.
I �
3'
SEE NOTE q._q•
SECTION A -A VIEW
DIA PIPE <OUTLET)
I-- S " -0'--I
SECTION SIDE VIEW SECTION B -8 VIEW
BAFFLE WALL DETAIL NOTES:
1. CONCRETE: 5,000 PSI MINIMUM AFTER. 28 DAYS.
2. DESIGNED FOR H -20 LOADING.
3. TONGUE & '.GROOVE JOINT SEALED WITH BUTYL RESIN.
ALSO AVAILABLE IN H -10 LOADING WITH 3" WALL
PROPOSED SEDIMENT TANK
NJ,,S
JurtwVwL a uRC V.11 wtm r1LI CR rnDRA.
1 08/05/
2 08/31/
NO, I DATE
REVISIONS
Revise Drain Inverts
Add Excavation Notes
DESCRIPTION
FWR FWR
FWR FWR
BY CHK'D
SHEET No. 6 OF 12 I PROJECT No. 20423.0(1
�B _6•�
T
i 0
I
I �
3'
SEE NOTE q._q•
SECTION A -A VIEW
DIA PIPE <OUTLET)
I-- S " -0'--I
SECTION SIDE VIEW SECTION B -8 VIEW
BAFFLE WALL DETAIL NOTES:
1. CONCRETE: 5,000 PSI MINIMUM AFTER. 28 DAYS.
2. DESIGNED FOR H -20 LOADING.
3. TONGUE & '.GROOVE JOINT SEALED WITH BUTYL RESIN.
ALSO AVAILABLE IN H -10 LOADING WITH 3" WALL
PROPOSED SEDIMENT TANK
NJ,,S
JurtwVwL a uRC V.11 wtm r1LI CR rnDRA.
1 08/05/
2 08/31/
NO, I DATE
REVISIONS
Revise Drain Inverts
Add Excavation Notes
DESCRIPTION
FWR FWR
FWR FWR
BY CHK'D
SHEET No. 6 OF 12 I PROJECT No. 20423.0(1