COMPLIANCE INFO_2003-2005 - Laserfiche WebLink

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tion 3, Figure 2.3.1 for proper dis- tances. 3. Compact backfill carefully over and around the piping system. (See Figure 1.6.1). When using tamp- ing equipment, take care to pre- vent vibration from driving small stones into the pipe wall. The amount of compaction and the type of soil determines the soil modulus for example, pea gravel has a typical modulus of 1,000 psi with no compaction, while sand requires slight compaction (85% Proctor density) to achieve modu- lus of 1,000 psi. Refer to ASTM D3839 orAWWA C950 for further details. 4. Cover the pipe as soon as possible aftersuccessful testing to eliminate the chance of damage to the pipe, floatingof thepipe due to flooding, or shifting of the line due to cave- ins. If damage is suspected, the lines should be retested. 5. 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 backfilling (See Figure 1.6.2). Remember, in all cases, the pipe must be completely surrounded with se- lect backfill (sand or 1/8 -inch to 3/4 - inch pea gravel). Native backfill materials should never be used. In all cases, there must never be voids (ar- eas which do not contain backfill) under or around the pipe. Six inches (150mm) of the fill must be placed under the pipe as bedding material (See Figure 1.6.3). 1.6.3 Adhesive Bonding Several basic adhesive systems are available from Smith Fiberglass Prod- ucts. They differ in operating charac- v $ ` Table _ 4.. (min. j . _ 100 mm.., Table. F inu. �� .` i f► 150mn l 150 m Figure 1.6.3 The pipe must be completely surrounded with select backfill sand or 1; 8" to 3/4" pea gravel. teristics and working time (pot life) approximate number of bonds per (See Figure 1.6.4). kit. The working life of each kit is Table 1.6.2 lists the adhesive kits, based on an ambient temperature of their recommended usage, and the 75°F (24°C).