COMPLIANCE INFO_2003-2005 - Laserfiche WebLink

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1.6.1 Piping Layout Advance planning of the piping lay- outisessential. [twill make servicing the system easier and can reduce the quantities of material required. 1. Using the shortest practical route, run the pipe in a single trench from the tanks to the vent risers. 2. Pipe should run parallel to the tanks and dispensers. 3. 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 mini- mum burial depths. 1. Typically, all piping should slope at least 1/8 inch (3mm) per foot toward the tank. Support pipe properly to prevent traps or sumps. v W..3^ FIBERGLASS, . 2. The piping should be separated by a distance of at least four to six inches (100-1 50mm); the pipe and trench wall should be separated by at least six inches (150mm). See Figure 1.6.3. For double-wall secondary containment piping in- stallations, refer to Part Two, Sec - TABLE 1.6.1 RECOMMENDED MINIMUM BURIAL DEPTHS BASED ON SOIL MODULUS OF 1,000 PSI OR HIGHER (Refer to ASTM D3839 or AWWA C950 for Method/Theory) 10 - Min. Amount of Sand Pipe Size Surface Condition Minimum or Pea Gravel above Burial Depth the Top of the Pipe (in.) O,:::::.: (in.) (mm) (in.) 2 Un paved P 17 12 v . 4 Pa ed nunasphalt 100mm 12 Paved, min. 4" (100mm) concrete 9 22 5 127" 3 75 Unpaved 20 '`:`:' 508 14 35& Paved, min. 4") 100mm as ( asphalt 13 Paved, min. 4 100mm concrete. <>...27:' 7 t 4O( Unpaved 20 SOS;°:> 14 356 Paved, min. 4") asphalt halt ( P 14 356 10 24 Paved, min. 4 (100mm) concrete 11279 7 17$ 10