1. Excavation Backfill cover (A) may range from 6" to 30". Sidewall and end wall allowance (B) should be 18'' to 24". Bedding (C) should be a well compacted sand/gravel mixture: 6'' minimum in soil terrain, 12" minimum in rock terrain.
2. Lid and Manhole Extension For proper fit, install the lid and/or manhole extension before you put water in the tank and backfill. Please note the direction of flow - the inlet is higher than the outlet.
3. Installation of Bulkhead Fittings Install bulkhead fitting in either side of manway or end rib as shown. Tank must be vented. Tank lid includes gasket and stainless steel screws for water-tight seal.
4. Backfilling Exterior and Filling with water CAUTION: Start filling the tank with water when you begin to backfill, keeping the water level even with the backfill level-as you go. Backfill in 12" maximum layers with a well compacted sand/gravel mixture. ALWAYS COMPACT ENDS FIRST. Tamp and compact backfill under inlet and outlet pipe.
5. Backfilling the Top of Tank Once the tank is filled with water, backfill to the surrounding level to a maximum of 30".
General Notes: Do not install tank in water-saturated clay or in high water table. Do not install tank across the path of vehicles or heavy equipment. The tanks are designed for below ground use only. For a water-tight seal, lid must be sealed with silicone caulking. Cistern tanks should remain one-fourth full at all times. Failure to comply with our installation procedures and general notes will void the warranty.

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