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MAR -12-91 T U E 1.6.1 Piping layout e 0 H I C K M A M - P-01 1 /111 A_ s e o Advance planning of the piping layout is essential. It will make ser- 2. vicing the system easier and can reduce the quantities of material required. 1. Using the shortest practical route, run pipe in a single trench from the tanks to the 3. dispensers and from the tanks to the vent risers. 2. Pipe should run parallel to the tanks and dispensers. . Avoid piping across the tanks. 1.6.2- Trenching and backfilling Proper construction of trenches is important. They should be wide and deep enough to accommodate the piping and backfill material. See Table 1.6.1 for recommended minimum burial depths. 1. Typically, all piping should slope at least Ma inch per foot toward the tank, Support pipe properly to prevent traps or sumps. The piping should be separated by a distance of at least four inches (102 mm); the pipe and trench wall should be separated by at least six inches 0 52 mm). See Figure 1.6.3 and Note. Compact backfill carefully over and around the piping system to prevent the vibration of tamping equipment from driving small stones into the pipe wall (See Figure 1,6.1). WYEAURTM IL11 4. Timing -Cover the pipe as soon as possible after successful test- ing to eliminate the chance of damage to the pipe, floating of the pipe due to flooding, or shifting of the line due to cave- ins. If damage is suspected, the lines should be retested. S. Frozen earth will eventually thaw, leaving the pipe with insufficient support and voids around the pipe. Take care to remove frozen lumps from all backfill materials before back- filling (See.Figure 1.6.2). ill • �w � rr-� • Pipe Size On.) :.(�►►mf ° Surface Condition Minimum Burial Depth P (In.) I`�x,..:.: ` Min. Amount of Sand or Pea Gravel above the top of the pipe On.) fmm). 2 x':51 'r Unpaved 17 x'432 12 Y ,305 Paved, min. 4'° (102 mm) asphalt 12 3p5::' ( $r ' ' 203 Paved, min. 4'° (102 mm) Concrete 9 229 5:>.. 3 a . 76 Unpaved 3 508 ' S Paved. min. 4" (102 mm) asphalt 13 14 356 Paved, min. 4" (102 mm) concreto 11 279;'x'' 7 4 c. ;";;102 Unpaved 20 { , l '• ; " 102 mm asphalt Paved, min. 4 ( ) p 14 14 1 254 Paved, min. 4" (102 mm) concrete 11i' 29. q5` 178 IYw....,..rw......�<.,..^'^{?+-...+r+..Tfn^+"mx�q*r••w.....w..�,�.�e•--..r....-n�r.�.....m......1...,p...,. .._.