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F9. Install Polyethylene Top and Backfill After completing all piping and electrical piping connections: • Verify final grade. • Trim top of turbine enclosure (if necessary). • Place polyethylene top over turbine enclosure ❑ This top is designed to prevent water runoff from entering turbine enclosure only. • Position top and press down to seat the top onto the turbine enclosure. • Backfill to turbine enclosure top. Polyethylene Top (42" Diameter) Top Lid 0.D. Model Diameter (O.D.) PT42-23 23" PT42-27 27" PT42-32 32" For Owens-Corning supplied 48" containment collar and turbine enclosure: • Place 48" x 42" reduction collar over turbine enclosure. • Place 42" polyethylene top over reduction collar. • Backfill to turbine enclosure top. 42" I.D. HDPE Lid (23", 27", or 32") 10" HDPE Top 6" HDPE Reduction Collar (48" x 42") FRP Turbine 2,3,4, or 5' Enclosure 2" L 48" I.D. 48" Containment Collar 41/2 "T F10. Top Clearances Important: Isolate Turbine Enclosure From Direct Traffic Loading. After backfilling to top of turbine enclosure: • Place 1 1/4" of specified gravel and then 3/4" thick plywood (4'x 4') over top (but not over lid) to allow a 2" minimum clearance between top of turbine enclosure and bottom of concrete pad. ❑ This 2" clearance also provides a channel for water runoff. If the tank is located in a traffic area: • Pour 9" thick traffic slab with extra rebar reinforcement directly onto plywood. F11. Sealable Turbine Enclosure Do Not Air Pressure Test Sealable AWARNING Turbine Enclosure. See Section F7 For Testing Methods. Sealable Turbine Enclosures Must Be Isolated From Direct Traffic Loading. To prevent water infiltration in high groundwater conditions (sealable turbine enclosures are not product tight) sealable turbine enclosure must: • Be mounted and cemented to tank collar using same procedure described in section F5. • Have its top mounted and cemented in place. • Use electrical couplings kit provided by Owens-Corning. • Use seal off fittings to make electrical wiring connections leak free . (If it is to be leak tested using standing water test). • Use FRP couplings for pipe connections. Do not use rubber grommets which are not watertight and will leak in high groundwater conditions. • Always vent sealable turbine enclosure. The 2" lid fitting can be used as a vent with piping leading to a point above the groundwater table. To adjust for final burial depth: • Trim bottom of sealable turbine enclosures or bottom of fiberglass sealable turbine enclosure top. • Cement in place using kit AD and allow adhesive to cure. • Torque lid bolts to 25 ft. -lbs. Follow ASTM specifications for "Structural Joints Using ASTM A325 or A490 Bolts". • The gasket is a maintenance item which will have to be replaced periodically or when it shows a leak during a tightness test. • Test both joints of enclosure using standing water test described in section F7. Sealable Turbine Enclosure (42" or 48" Diameter) Plywood (48"x48" x 3/4") Street Box HDPE Friction Reinforced Fit Lid Concrete' Moder length (L) STE 42B-2 2' 5'h„� 2 —F -V, Polyethylene Top Tom— onal Field Installed Field Installed rical Coupling for Coupling trical Connections (Kit FC -3) LField STE 48B - 2 2' onded Joint (Kit Ad) Field Bonded nment Collar Containment Collar Sensor.(CCS) #5 Rebar 8" on center, both ways, extending 4'0" in all directions from center After backfilling to top of turbine enclosure: • Place 1 1/4" of specified gravel and then 3/4" thick plywood (4'x 4') over top (but not over lid) to allow a 2" minimum clearance between top of turbine enclosure and bottom of concrete pad. ❑ This 2" clearance also provides a channel for water runoff. If the tank is located in a traffic area: • Pour 9" thick traffic slab with extra rebar reinforcement directly onto plywood. F11. Sealable Turbine Enclosure Do Not Air Pressure Test Sealable AWARNING Turbine Enclosure. See Section F7 For Testing Methods. Sealable Turbine Enclosures Must Be Isolated From Direct Traffic Loading. To prevent water infiltration in high groundwater conditions (sealable turbine enclosures are not product tight) sealable turbine enclosure must: • Be mounted and cemented to tank collar using same procedure described in section F5. • Have its top mounted and cemented in place. • Use electrical couplings kit provided by Owens-Corning. • Use seal off fittings to make electrical wiring connections leak free . (If it is to be leak tested using standing water test). • Use FRP couplings for pipe connections. Do not use rubber grommets which are not watertight and will leak in high groundwater conditions. • Always vent sealable turbine enclosure. The 2" lid fitting can be used as a vent with piping leading to a point above the groundwater table. To adjust for final burial depth: • Trim bottom of sealable turbine enclosures or bottom of fiberglass sealable turbine enclosure top. • Cement in place using kit AD and allow adhesive to cure. • Torque lid bolts to 25 ft. -lbs. Follow ASTM specifications for "Structural Joints Using ASTM A325 or A490 Bolts". • The gasket is a maintenance item which will have to be replaced periodically or when it shows a leak during a tightness test. • Test both joints of enclosure using standing water test described in section F7. Sealable Turbine Enclosure (42" or 48" Diameter) Moder length (L) STE 42B-2 2' 5'h„� f 12” Top (FRP) STE 42B-3 3' 12�� / Turbine STE 42B-4 4' 1 Enclosure STE 48B - 2 2' 1 Field Bonded STE 48B - 3 3' Joint 1 STE 48B-4 4' L • Excludes secondary piping connections and 61/2" Detail Containment ////��Tank / Wall adhesive kits. Collar Continued on next page. 23