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Trenching and Backfilling <br />Proper construction of trenches is important. They should <br />be wide and deep enough to accommodate the piping and <br />backfill material. See below for recommended minimum burial <br />depths. <br />• Typically, piping should be sloped at least %a" (3 mm) per <br />foot toward the tank. Support pipe properly to prevent <br />low points. <br />• The piping should be separated by a distance of at least <br />four to six inches (100-150 mm). For double-wall second- <br />ary containment piping installations, refer to Table below <br />for recommended distances. <br />13 <br />jk.I, Y `d 'Z0i7 <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />