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After backfilling to top of turbine enclosure: • Place 1-1/4" of specific gravel and then 3/4" thick ply- wood (4'x 4') over top (but not over oval 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. ❑ See section Flo for more details. If the tank is located in traffic area: • Pour 9" thick traffic slab with extra rebar reinforcement directly onto plywood (see drawing - Section F 10). • After sealable turbine enclosure is installed ❑ Use a minimum 36" diameter (or 36" square) street box to allow room to remove oval lid after it is in- stalled. F12. Monitoring CAUTION: Secondary containment collar must be con- tinuously monitored for potential spills or leaks. To detect accumulation of liquid in collar: • Equip all secondary containment collars at the jobsite with an optional electronic monitor. • Place monitoring sensor in a protective casing. • Fasten casing to sensor mounting bracket on side of tur- bine enclosure using a mounting clamp. Secondary Containment Collar Secondary Contain- ment Collar – Manway Containment Collar Sensor (CCS) Containment Collar Sensor (Model CCS) Lead Wire (72" Min.) �— Trip Rod Hose Clamp Float Switch AK Perforated Plastic Casing II , 24 Containment Collar Sensor (Mode! CCS): For continuous electronic monitoring of secondary con- tainment collars, Fluid Containment can provide a con- tainment collar sensor which: • Consists of a float switch (normally closed) housed in a protective plastic casing. ❑ Float switch is activated after I" accumulation of liquid in collar (approximately one gallon of liquid when placed at lowest point in containment collar). • Features a trip rod, which is used to test float switch in installed condition. • Is compatible with optional electronic control panels sup- plied by Fluid Containment. ❑ All electrical components for the collar sensor are U.L. listed. If collar sensor detects product in the containment col- lar, disconnect power to submersible pump by: • Providing an electrical feedback circuit from the moni- toring system to disengage submersible pumps. See sec- tion D4, Transmission Contact Switch, for optional Fluid Containment Control Panel. Note: Test the containment collar at least once a year. F13. Traffic Slab • Traffic areas require a rebar reinforced concrete road surface to span the underground void created by turbine enclosure (see section F10). Fuel vapors may be present in the tur- AWARNING bine enclosure. To prevent fire or explo- sion hazard, keep all ignition sources away when removing turbine enclosure lid. Treat any entry into turbine enclo- sure area as confined space entry. F14. Maintenance • Use caution for normal maintenance or inspection of sub- mersible pump and piping located in turbine enclosure. F15. Future Periodic Testing If turbine enclosure has been abused, damaged, or worn: • Test turbine enclosure immediately for potential leaks. In Normal Service • Use standing water test as described in F7. Note: Leak test turbine enclosure at least once a year.