CONSTRUCTION NOTES FOR STORM SEWERS D-1.0 STANDARD CATCH BASIN DETAIL D-1.1 STANDARD CURB INLET DETAIL D-1.2 STANDARD COMBINATION CURB INLET DETAIL D-1.3 G-2 CATCH BASIN DETAIL D-1.4 SLOPED FIELD INLET DETAIL D-1.5 STANDARD AREA INLET DETAIL D-1.6 ·
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STANDARD RECTANGULAR VANED GRATE & FRAME DETAIL D-1.7 CATCH BASIN TRAP DETAIL D-1.8 STANDARD MANHOLE DETAIL D-2.0 PRE-SEDIMENTATION / SEPARATOR MANHOLE DETAIL D-2.1 STANDARD PRE-CAST DRYWELL D-2.2 STANDARD SEWER CLEANOUT DETAIL D-2.3 VA NCO UVER, WA
MANHOLE COVER AND FRAME STANDARD DETAIL D-2.4 ROAD SURFACE
CONCRETE COLLAR FOR VALVE BOXES SET IN PAVED AND UNPAVED AREAS. (24" SQUARE, 4" THICK)
24" DIA. X 4" DEEP CONCRETE COLLAR AROUND VALVE BOX.
RISER PIPE TO BE INSTALLED PLUMB 6" RISER PIPE SEE NOTE #1 SEE NOTE #1
NOTES:
1. RISER PIPE SHALL BE 6" DIAMETER AND MATCH MAINLINE PIPE MATERIALS. 2. VALVE BOX SHALL BE "VANCOUVER 910". 3. THERE SHALL BE 1/2" CLEARANCE UNDER THE PIN CAST INTO THE LID. 4. CONCRETE COLLAR SHALL BE A MINIMUM STRENGTH OF 3000 PSI. 5. PIPE BEDDING SHALL CONFORM TO STANDARD DETAIL D-3.1. "APPROVED" TEE 6. TEE SHALL MATCH PIPE DIAMETERS.
FLOW CAP
STORM STUB MARKER D-2.5 STANDARD PERFORATED PIPE DETAIL D-3.1A RIGID & FLEXIBLE PIPE BEDDING DETAIL D-3.1B TRENCH BACKFILL DETAIL D-3.2 Notes on Fueling Island
1. Install drains centered between rows of fueling pumps. Drains shall connect to dead-end sump(s).
2. Fueling pad to be impervious Portland cement or equivalent, sloping 2-4% on all sides toward the drains. Pad shall extend at least 6 ft. from edge of fueling dispenser.
3. If a graded pad is not achievable, the City may approve a pad with berms located on all downslope edges of pad and a drain located near a bermed edge.
4. Fuel island shall be covered by a canopy to prevent rain or snow from falling on the pad. Cover shall extend at least 2 ft. beyond the edge of the grade break on the perimeter of the pad (or extend past berms).
5. Rain runoff from canopy can be directed to storm drain but not to pad.
Notes on Dead-End Sump
1. Sump shall be a solid wall inlet vault (no outlet openings). The City recommends a 6'L x 4'W size vault with a depth of 5½' which gives a capacity of approx. 700 gals. Smaller sizes may be submitted for approval.
2. Top should fit a steel inlet grate rated H-20 with minimum 6” top frame thickness. Concrete to be rated at 4,000 psi minimum.
STANDARD FUELING ISLAND DETAIL D-4.0 INLET OUTLET
Oil Retaining Baffle
OIL WATER SEPARATOR
Fuel Island Runoff - Surface Treatment Alternative: When a dead-end sump installation is not feasible the fueling pad runoff can be sent to an oil/water separator and then to treatment. This fuel island discharge alternative (D-4.1) illustrates a sump and submersible pump installed downstream of the separator. Runoff is directed to an approved surface infiltration treatment facility such as a bio-infiltration swale, rain garden, or treatment wetland. If possible for the site, the city could also approve a design for gravity drainage of separator discharges to a surface water facility.
Notes
1. Install a small capture sump downstream of the oil/water separator. Sump needs to be large enough to hold a small submersible pump.
2. Install submersible pump with a float mechanism capable of turning the pump on and off at prescribed water levels. A pump sized 30 gpm or more should easily handle storm event drainage from a covered fuel island. Pump should be seated onto something which raises it a few inches off the bottom of the sump to allow for some sediment buildup.
3. Install an easily accessible pump shutoff switch at the surface which will allow workers to turn off pump in the event of a spill.
4. All vault lids should allow for easy access to perform regular cleanouts, inspections, and maintenance.
FUELING ISLAND ALTERNATIVE DISCHARGE DETAIL SURFACE BIOFILTRATION D-4.1 OUTLET
OIL WATER SEPARATOR
Fuel Island Runoff - Underground Injection (UIC) Alternative: When a dead-end sump installation is not feasible the fueling pad runoff can be sent to an oil/water separator and then to treatment. This fuel island discharge alternative (D-4.2) illustrates a valve installed on the piping downstream of the separator to provide spill protection prior to sending runoff to treatment and to an underground infiltration device.
Notes
1. Install a valve inside a standard valve box on the exit piping from the oil/water separator.
2. The valve mechanism should be accesssible at the surface (may require a nut extension).
3. To meet state guidelines, send runoff to an approved stormwater treatment facility (such as a Stormfilter ©) prior to discharging to drywell, perforated pipe or to other acceptable infiltration. (UIC facilities must be registered with Ecology).
4. All vault lids should allow for easy access to perform regular cleanouts, inspections, and maintenance.
FUELING ISLAND ALTERNATIVE DISCHARGE DETAIL UNDERGROUND INJECTION D-4.2