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%W01 *1./ Crossovers- Try to keep crossovers to a minimum. If Proper backfill material is important. Pea gravel, crushed they are unavoidable, place them as close to the tank as stone (up to 3/4 inch, tumbled. no sharp edges) and possible. Note that for calculating slope, 3" of backfill is clean, compacted sand all have acceptable soil modulus required between pipes on crossovers. and are approved for trench bedding and backfill. If you use sand it must be clean sand, and it must be compact- Crossing Tanks- Where possible, try not to have the ed. Once again, it is important not to have large rocks or pipes cross over the tanks. objects in the "top layer" of backfill as they have a ten- dency to migrate downward and could make contact Preparing The Site with the piping. ' I N Oman I ii1110 1 f t - - r ,. .. OM t F v .Approved backfill materials: pea gravel,crushed rock and Trenches should be dug as straight as possible and wide compacted sand. enough to accommodate all runs of piping with proper Dispenser or pump island forms, if used,should be set spacing. at the proper elevation and leveled. Underground stor- age tanks should be installed and backfilled to the top APT requires a minimum 4" of spacing between each of the tank or tanks. run of pipe and 6" on each side of the outside runs from the trench wall. Minimum burial depth on Poly-Tech is 12" (6" of backfill and 6" of concrete). A minimum 18" Installation Tools of clean backfill material should be used if there will be no pavement or concrete over the trench. Larger size Now it's time to take a look at the tools you will need for rocks or foreign objects should not be included in this installing the Poly-Tech piping. One of the most impor- fill material as they have a tendency to migrate down- tant tools you will be using is a utility knife with multi- ward. (Example: 4" of pea gravel below the pipe, 4" for ple blade settings. One with a standard straight blade the height of the pipe itself, and 18" of burial will make and one with a hooked blade is recommended. it necessary for the trench to be 26" deep to the bottom You will also need a hacksaw, ratchet wrench with 3/8", of the excavation). 7/16", 1/2", 9/16" and 3/4" deep well sockets. 5/16" and 3/8" nut drivers or a blade screw driver are Trenches should slope a minimum of 1/8" per foot for also required. product pipe, and 1/4" per foot for vent/vapor pipe. A minimum of 4" of pea gravel or 6" of compacted sand 5/16" and 7/16" drill bits and a set of hole saws in vari- should be used in the bottom of the trench. Trenches ous sizes will be needed for flexible entry boot installa- must be bedded and grade established prior to laying tion (refer to the flexible entry boot installation guide pipe. It is difficult to finish grading and compacting the for proper sizing). A 5-1/2" hole saw is also required for backfill when the pipe is in your way! our 4" tank fitting adapter. 111