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1. 6" 150 mm The pipe must be completely surrounded with select backfill (sand, pea gravel ormshe d crushed stone). Eel. i 4: iM NT -1 My ; i 1 In all cases, the pipe must be completely surrounded with select backfill (sand, 1/8" to 314" pea gravel, or 1/8" to 1/2" washed, crushed stone). There should never be voids under or around the pipe. Six inches (150 mm) of the fill must be placed under the pipe as bedding material. Native backfill materials should never be used. TABLE 3. Recommended Minimum Burial Depths Based on Soil Modulus of 1,000 psi or Higher (Refer to ASTM D3839 or AWWA 0950 for thod/Theory) Primary Piping System Installation Min. amount of Sand, Pea Gravel, Pipe Size Compact bacidill carefully over and around the piping TRENCHING AND:BACKIFILLING system. When using tamping equipment, take care to Proper construction of trenches is important. They prevent vibration from driving small stones into the should be wide and deep enough to accommodate the pipe wall. The amount of mm piping and backfill material. See Table 5 for recommended compaction and the type Unpaved minimum burial depths. of soil determines the soil 12 305 modulus. Forexample, pea ;• • Typically, all piping should slope at least 1/a" (3 mm) per gravel has a typical 305 foot toward the tank. Support pipe property to prevent modulus of 1,000 psi with low points. no compaction, while sand R,,;kru must •The g in should be separated by a distance of at requires slight compaction be tamped into shaded areas. I to sk Inches (100 mm -150 mm). For double- (85% r density) to achieve a modulus of 1,000 psi. Refer to ASTM D3839 wad secondary containment piping installations, refer to 9 Table 11 on page 18 for proper distances. or AWVVA 0950 for further details. 76 3 1. 6" 150 mm The pipe must be completely surrounded with select backfill (sand, pea gravel ormshe d crushed stone). Eel. i 4: iM NT -1 My ; i 1 In all cases, the pipe must be completely surrounded with select backfill (sand, 1/8" to 314" pea gravel, or 1/8" to 1/2" washed, crushed stone). There should never be voids under or around the pipe. Six inches (150 mm) of the fill must be placed under the pipe as bedding material. Native backfill materials should never be used. TABLE 3. Recommended Minimum Burial Depths Based on Soil Modulus of 1,000 psi or Higher (Refer to ASTM D3839 or AWWA 0950 for thod/Theory) 5 Minimum Min. amount of Sand, Pea Gravel, Pipe Size Surface Condition Burial Depth Washed Stone Above Top of Pipe In. mm In. mm In. mm 2 50 Unpaved 17 432 12 305 Paved, min. 4" (100 mm) asphalt 12 305 8 203 Paved, min. 4" (100 mm) concrete 9 229 5 127 Paved, min. 6" (150 mm) concrete 9 1 229 3 76 3 75 Unpaved 20 508 14 356 Paved, min. 4"(100 mm) asphalt 13 330 9 229 Paved, min. 4" (100 mm) concrete 11 279 7 178 Paved, min. 6"(150 mm) concrete 10 254 4 102 4 100 Unpaved 20 508 14 356 Paved, min. 4" (100 mm) asphalt 14 356 10 254 Paved, min. 4" (100 mm) concrete 11 279 7 178 Paved, min. 6"(150 mm) concrete 10 254 1 4 102 6 150 Unpaved 36 914 14 356 Paved, min. 4" (100 mm) asphalt 24 610 10 254 Paved, min. 4"(100 mm) concrete 20 508 7 178 Paved, min. 6"(150 mm) concrete 16 406 4 102 5