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If the Administrative Authority requires visual inspection of the exterior walls during the water test, then use the following procedures. SINGLE TANK UNITS: Backfilling in increments can accomplish an exterior wall inspection when done in 2-foot lifts.To begin introducing,2 feet of water in the bottom of the TANK.Once inspected,backfill and compact 2 feet of the outside walls, after compaction add an additional 2 feet of water into the tank. Inspect the outside walls as previously done and repeat these procedures until completely inspected and backfilled. MULTIPLE TANKS IN A BATTERY CONFIGURATION: Backfilling,in increments can accomplish an exterior wall inspection when done in 2-foot lifts.However,prior to the introduction of water to the tanks,all outside walls should be backfilled and compacted to a minimum of 2 feet. Subsequently,2 feet of water can be introduced to the TANK and the same procedure followed as above. Bypassing or isnorinL,any of these requirements (to any degree) could cause damaze to the TANK and void the Jensen Precast warranty. For additional information or clarification please contact Jensen Precast 11.VACCUM TESTING This test method is intended to be used to demonstrate the condition of the installed system prior to backfill. WARNING: Testing of the system before backfilling is necessary to preclude inadvertent structural overloading of the system components during the test.Follow procedures set forth in ASTM 1613 and C 1227. Seal the tank and apply a vacuum of 4"of mercury.Hold the vacuum for 5 minutes.During the initial 5 minutes,the vacuum shall not drop more than%"of mercury,which allows for equipment pressure equalization loss.If the vacuum drops,it shall be brought back up to 4"of mercury and held for additional 5 minutes with no vacuum loss.It the tank fails the test;it shall be repaired and retested. 12.REPAIR 13.PRECAUTIONARY NOTE Underground TANKS, and other similar type enclosures are confined spaces and entry is not recommended as the atmosphere may be hazardous. If entry is necessary, enter only with the proper equipment and follow O.S.H.A. confined space entry procedures. Jensen Precast recommends that all applicable O.S.H.A.recommendations are read and followed,including the current section on confined spaces and"Permit Required Confined Space". This warning is presented for precautionary safety advice only. Owners, users, installers, contractors, etc. are responsible for job site safety and O.S.H.A.compliance. 14.ACCEPTANCE Jensen Precast's responsibility for the TANK installation and sealing shall be considered finished and the tank shall be considered accepted by the owner once any of the following occurs: 1. The owner,contractor,customer,or engineer accepts the system. 2. A watertightness test has been completed and satisfactorily passed. 3. The TANK has been placed in service. 4. The safety conditions on the job site are not acceptable to Jensen Precast or its authorized representative. 5. Failure or gross neglect in following the instructions contained herein. MANUFACTURER OF PRECAST CONCRETE PRODUCTS g Tank Installation Procedures-rev 101624.docx