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Page 6 of 13 F. SETTING: Set tanks on prepared bed with a slope downward toward the fill end of the tank. A slope of 3" difference between the two extreme openings of the tank is desired. The acceptable range of slope is 4" maximum and 2" minimum with the fill end lower than remote pump end of the tank. Tanks that exceed the acceptable slope or that slope downward to the remote pump end are improperly set and must be reset. G. INSTALLATION WITH APPROVED MATERIALS: Place a 12" lift of backfill evenly around the tanks. Push backfill completely underneath the tank and under the end caps. This is the most important part of the backfill process. Procedure can be done from bank or adjacent tank top. If a man will be in the hole to "work" the backfill, hole must be shored or side sloped as prescribed by current OSHA regulations. 1. Place second 12" lift or backfill evenly around the tanks. Again, repeat the "working" of backfill along sides under the end caps. Add backfill evenly around the tanks up to the tops of the tanks. 2. Backfill to subgrade after piping and testing is completed. 6-150.09 TESTING OF TANKS (Notify Owner's Representative, who MUST observe all tests, at least 24 hours in advance of any tests.) A. The Contractor is responsible for all labor, material and equipment necessary to conduct the following tests: Pre-Installation Pressure Test, Aix After-Installation Pressure Test, Aix or Hydrostatic Internal Measurements 1. ACCEPTABLE "SOAPS": "Soaping" the tank and fittings during the test is to be done using a small garden-type hand-pressurized spray unit. The test soap shall be a high foaming "soap" that bubbles easily if in contact with an air leak in the tank, but won't bubble due to dispensing from the pressure applicator. Acceptable soaps are: "Seam Test Concentrate" "Amway Lcc High Soap" "#7006 Southbed Leak Detector" B. PRE-INSTAL AmrON PRESSURE TEST, AIR: 1. PRIMARY (INNER) TANK TEST: Tighten all tank fittings. Locate a pressure gauge in the vent/monitor fitting in the secondary (outer) tank. Locate a second pressure gauge at a fitting in the manway and connect the air pressure hose to this same fitting. Pressurize the primary (inner) tank to a minimum 4 psi, maximum 5 psi. Monitor the pressure gauges a minimum of 1/2 hour. 2. SECONDARY (OUTER) TANK TEST: Leave the pressure on the primary tank. Using a flexible air hose manifold, connect the air pressure hose from the primary tank to the secondary tank. This manifold hose should be connected to the vent/monitor fitting that does not contain the air pressure gauge. Close the valve to the primary tank and disconnect the air supply. Pressurize the secondary tank by opening the valve in the manifold system. Soap the entire tank and all fittings.