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'MISC#4\FILES\9750SPEC Page 9 of 22 E. DAMAGE: If tank is damaged, do not attempt repairs. Company Rep. is to be notified and will determine the course of action that will be followed. 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 between the ribs 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" or backfill between the ribs and 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. H. INSTALLATION WITH ALTERNATE MATERIALS: All alternate materials must be compacted to 90% relative density (ASTM D-1557-70) . Contractor is to furnish with certification of compaction from a registered soil engineer. 1. Company Rep. is responsible for providing the exact installation specificattio-nn for alternate materials. 2 . 3 TESTING OF TANKS (Notify the Company Rep. , 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, Air After-Installation Pressure Test, Air or Hyrdostatic Internal Measurements