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6.BACKFILLING Failure to comply with proper backfill procedures could result in structural damage or leakage from pipe connections, or leakage from the TANK,due to settling,point loading,impacting,etc.Backfill shall be suitable clean material and shall be laid in lifts limited to 24" and adequately compacted from bottom to top to prevent movement or settling under the pipe or fittings. Only mechanical backfilling methods can be utilized; water jetting (liquification of backfill dirt)is not acceptable and could damage the TANK. CAUTION: High slump or flowable backfill like cement slurries must not be laid in lifts greater than 24"and must be allowed to set up before the next lift is laid. It is recommended that before using flowable backfills, contact Jensen Precast to discuss procedures for your application. 7.WATERTIGHT TESTING OVERVIEW When watertight testing is required during inspection,testing must be completed and approved after installation,but before the tank is put into service.Testing for water tightness shall be performed using either hydrostatic water test or vacuum test per ASTM C 1227-09 section 9 or ASTM C 1613 section 9. Standard water test is conducted up to the outlet of the tank per ASTM. Warning:Water tests conducted above the lid of the tank may have structural implications and could exceed the structural design of the tank. Contact Jensen Precast for complete details. TANK with capacities of 2000 gallons or greater have specific backfill requirements before water testing. See section 10. The owner,customer,contractor,or others shall be solely responsible for the following: 1. Conducting and approval of the test. 2. Providing water and means to pump or evacuate water for testing or any subsequent retesting. 3. Providing the vacuum pump,seals for access opening and pipe plugs. 4. Sealing or testing grade rings,risers,covers,other openings,etc. 5. Any required sealing and testing of inlet and outlet pipelines. 8.PRE-TEST INSPECTION Before any applicable tests are performed and before the TANK is placed into service,a visual inspection is to be performed to ensure that the TANK is free of trash and debris that could prevent the TANK from functioning properly. All foreign objects such as rocks,trash,tools,or construction materials left inside the TANK from the installation process should be removed and properly disposed. Check that the tank is level. Check that the inlet and outlet pipe are properly connected and sealed to the tank. Check the tank inlet, baffle and outlet have the appropriate pipe fitting attached and have no obstructions. 9.WATER TESTING TANKS UP TO 1500 GALLONS The TANK shall be filled to the operational liquid level (outlet invert) with water and allowed to stand to achieve complete concrete absorption, then refilled to the same level. Once refilled, there shall be no measurable liquid loss in the following hour. (Ref.ASTM C-1227-07 9.2.2) 10.WATER TESTING TANKS 2000 GALLONS AND GREATER All TANKS of 2000 gallon capacity or greater and all battery TANKS must be backfilled to the outlet pipe when water testing.Warning:Water testing tanks with a liquid capacity of 2000 gallons or greater without backfilling could damage the tank.The TANK shall be filled to the operational liquid level with water and allowed to stand to achieve complete concrete absorption,then refilled to the same level.Once refilled,there shall be no measurable liquid loss in the following hour. (Ref.ASTM C-1227-07 9.2.2) MANUFACTURER OF PRECAST CONCRETE PRODUCTS 5 Tank Installabon Procedures-rev 101624.doex