observation well (perforated flow€¦ · typical dry well uncompacted subgrade (not to scale)...
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OBSERVATION WELL (PERFORATED
TYPICAL PERMEABLE PAVEMENT CONSTRUCTION DETAIL
NON-WOVEN GEOTEXTILE OR FILTER LAYER ( FILTER
LAYER REQUIRED FOR LEVEL 2 6"-8" OF COARSE SAND)
UNCOMPACTED
SUBGRADE SOIL
EDGE RESTRAINT
(CONCRETE)
N.T.S.
FINISHED GRADE
F
L
O
W
2" OF #8 STONE BEDDING LAYER
(
3
8
" TO
3
16
" IN SIZE)
4" OF #57 STONE BEDDING LAYER
(
1
2
" TO 1-
1
2
" IN SIZE)
X" OF #2 STONE RESERVOIR LAYER (
3
4
" TO 3"
IN SIZE) SEE EQUATIONS 7.1 AND 7.2 FOR
CALCULATION OF LAYER THICKNESS (DSTONE)
PERFORATED OBSERVATION WELL
TO EXTEND TO BOTTOM OF STONE
STORAGE LAYER
OBSERVATION WELL (PERFORATED
PVC PIPE) WITH METAL CAP
PERMEABLE PAVERS
NOTE: SUBGRADE IS TO BE
GRADED TO A 0% SLOPE
DEPARTMENT OF ENVIRONMENTAL SERVICESARLINGTON COUNTY, VIRGINIA
OFFICE OF SUSTAINABILITY AND ENVIRONMENTAL MANAGEMENT
REVISION & DATE
PERMEABLE PAVEMENT CONSTRUCTION DETAIL
DRAWING NO.
SWM # 1
TYPICAL PERMEABLE PAVER CONSTRUCTION DETAIL
NON-WOVEN GEOTEXTILE
UNCOMPACTED
SUBGRADE SOIL
EDGE RESTRAINT
(PLASTIC OR
CONCRETE)
N.T.S.
FINISHED GRADE
F
L
O
W
2" OF #8 STONE BEDDING LAYER
(
3
8
" TO
3
16
" IN SIZE)
12" MINIMUM OF #57 STONE
BEDDING AND RESERVOIR LAYER
(
1
2
" TO 1-
1
2
" IN SIZE)
PERFORATED OBSERVATION WELL
TO EXTEND TO BOTTOM OF STONE
STORAGE LAYER
OBSERVATION WELL (PERFORATED
PVC PIPE) WITH METAL CAP
PERMEABLE PAVERS
NOTE: SUBGRADE IS TO BE
GRADED TO A 0% SLOPE
NOTE:
FOR INSTALLATIONS THAT ABUT STRUCTURES, A 30 MILIMPERMEABLE LINER SHALL BE USED. IT SHALL EXTEND ALONG THESIDE OF THE PAVEMENT FOR THE DEPTH OF THE INSTALLATION,AND EXTEND AT LEAST FIVE FEET HORIZONTALLY FROM THE EDGEOF THE STRUCTURE UNDERNEATH THE PAVER RESERVOIR LAYER.CONSULT WITH A COUNTY STORMWATER INSPECTOR TO CONFIRMIF APPLICABLE TO THE PROJECT.
DEPARTMENT OF ENVIRONMENTAL SERVICESARLINGTON COUNTY, VIRGINIA
OFFICE OF SUSTAINABILITY AND ENVIRONMENTAL MANAGEMENT
REVISION & DATE
PERMEABLE PAVERS CONSTRUCTION DETAIL
(SINGLE FAMILY RESIDENCES BUILT
SEPARATELY- LEVEL I)
DRAWING NO.
SWM # 2
NOTES:1. GUTTER GUARDS ARE TO BE INSTALLED ON ALL GUTTERS DRAINING TO DRY WELL.2. INSTALLED DIMENSIONS ARE BASED ON CHART BELOW.3. FACILITIES SHALL BE SET BACK A MINIMUM OF 10 FEET FROM THE PROPERTY LINE FOR A DOWN-GRADIENT PROPERTY, AND A MINIMUM OF 5 FEET FROM THE PROPERTY LINE FOR AN UP-GRADIENT PROPERTY. SETBACK FROM A BUILDING IS 10 FEET.4. ALL DOWNSPOUTS THAT DISCHARGE TO DOWNGRADIENT PROPERTIES MUST BE DIRECTED TO THE RIGHT OF WAY OR TIED INTO A DRY WELL.
RIGID SCHED. 40 PVC(MIN. SLOPE 0.5%)
CAP
VDOT #57 STONE
NON-WOVENGEOTEXTILEFABRIC (SIDES & TOP)
POP-UP EMITTER/OBSERVATION WELL
D
BOTTOM OPEN TO NATIVESOIL (NO GEOTEXTILE FABRIC)
PERFORATEDSCHED. 40 PVC PIPE
PLATE/ANCHOR
UNDISTURBEDMATERIAL
PERFORATEDSCHED. 40 PVC PIPE
TYPICAL DRY WELLUNCOMPACTED SUBGRADE
(NOT TO SCALE)
MATERIAL SPECIFICATION
VDOT NO. 57STONEINSTALL A VERTICAL 4 OR 6-INCH SCHEDULE 40 PVC PERFORATED PIPE, WITH A POP-UP EMITTER AND ANCHOR PLATE.OBSERVATION WELL /
OVERFLOW
INSTALL 6 - 8" OF TOPSOIL AND TURF.SURFACE COVER
FILTER FABRICMUST BE INSTALLED ON THE DRY WELL SIDES. WHEN TURF IS USED AS A SURFACE COVER, FABRIC SHALL BE INSTALLEDALONG THE TOP BETWEEN THE STONE LAYER AND THE SURFACE COVER. USE NON-WOVEN POLYPROPYLENE GEOTEXTILEWITH A FLOW RATE OF > 110 GALLONS/MIN./SQ. FT. (E.G., GEOTEX 351 OR EQUIVALENT).
MATERIAL SPECIFICATIONS FOR DRY WELLS
MAINTENANCE ACTIVITIES SCHEDULE
· REMOVE LEAVES AND DEBRIS IN GUTTER AT LEAF GUARD.· REMOVE LEAVES AND DEBRIS FROM OBSERVATION WELL / OVERFLOW. ANNUALLY
ONCE EVERY 5YEARS
· INSPECTED AND CERTIFIED BY A PROFESSIONAL LICENSED IN THE STATE OF VIRGINIA
DRY WELL MAINTENANCE SCHEDULE
L
PIPE PERFORATIONS ARE 3 /8 INCHES AT 6 INCHES ON CENTER.
THREADED METAL ROD WITH PLATE AT THE END INSTALLED IN THE OBSERVATION WELL TO FACILITATE CLEANOUT.CLEANOUT
· INSPECT THE CONDITION OF THE OVERFLOW OR POP-UP EMITTER AND MAKE SURE IT IS STILL CAPPED AND FUNCTIONING
INSTALL 6" SQUARE METAL PLATE FOR INSTALLATION WITH 4" PVC PIPE. INSTALL 8" SQUARE PLATE FORINSTALLATIONS WITH 6" PVC PIPE.ANCHOR PLATE
6"-8" TOPSOIL/TURFCLEANOUT ROD
DEPARTMENT OF ENVIRONMENTAL SERVICESARLINGTON COUNTY, VIRGINIA
OFFICE OF SUSTAINABILITY AND ENVIRONMENTAL MANAGEMENT
REVISION & DATE
DRAWING NO.
SWM # 7
DRY WELL DETAIL