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❑ Step 6: Backfill about 3/4 way up tank in layered, compacted 6" lifts using sand, stone dust, pea stone <br />or equivalent material that form -fits into tank corrugations. Keep backfill material damp to assure <br />compact backfill. <br />Water <br />❑ Step 6 continued: Install inlet and outlet pipes using primer and cement. For larger systems with 5" <br />inlet and outlets, you may use 5": 4" eccentric reducer adapters included with system. Install with <br />thin edge down. Apply primer and cement to 4" PVC pipe sections to inlet and outlet. <br />