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backfilled prior to completing the water tightness test. One-piece tanks shall be backfilled to 6 inches below the exterior tank top to allow construction of forms for a bentonite seal. All risers shall be appropriately oriented, consistent with logical positioning of plumbing and electrical penetrations,and attached to the tank top. The inlet(s)and outlet(s) shall be plugged and the tank filled with water.Pre-soaking concrete tanks for 24 hours is advised.The water level shall be 2 inches deep in the riser(above the exterior tank top) at the beginning of the water tightness test. CAUTION: Filling of the tank(s)shall be monitored closely to assure that no more than 2 inches of water is allowed to accumulate above the tank top.Pressure beyond this specification may compromise tank integrity and may require tank replacement at no cost to the Owner.No more than one gallon shall exfiltrate in a 24-hour period. Field repairs may be attempted once for observed sources of minor leakage.If the tank cannot be made watertight,then it shall be replaced at no expense to the Owner.Upon passing the water tightness test,backfilling shall be completed as described in the approved plans.Final grading of the finished surface shall assure that water does not accumulate around the risers or manhole covers. Each tank located adjacent to roadways or parking areas shall be protected from vehicular traffic by an adequate barrier(either locally available boulders or steel bollards filled with concrete and painted bright yellow).Excess soil from the excavations shall be managed on Site at a location designated by the Owner.Drawings of any approved "as built" changes noting pertinent dimensions,reference points, and elevations shall be provided to the Inspector by the Installer. 5.4 Effluent Filter Materials The effluent filter shall be manufactured to the functional specifications shown in the plans.If the manufacturer cannot meet the specifications shown,the Designer shall be notified in writing. Since the effluent filter assembly(as specified) is an integral part of the design,no substitutions will be allowed. Workmanship The effluent filter shall be installed in accordance with the approved plans and the manufacturer's instructions.Placement, assembly, and installation shall be conducted to facilitate easy operation, maintenance,repair,removal, and replacement.Drawings of any approved "as built" changes shall be provided to the Inspector by the Installer. 5.5 Universal Flow Inducer and Flow Inducer Tower Materials The Universal Flow Inducer and Flow Inducer Tower shall be manufactured to the functional specifications shown in the plans.If the manufacturer cannot meet the specifications shown,the Designer shall be notified in writing. Since these components (as specified) are an integral part of the design,no substitutions will be allowed. Valley—Albany,OR East Salem Seventh-Day Adventist Church I P&S Doc:2023240054 East Salem Church PS.docx November 2023 I Page 6