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Pressure Mains Smaller Than 6" <br />Particle Size Limitations <br />Sieve Size <br />% Passin <br />1 %z" <br />100 <br />#4 <br />50-100 <br />#200 <br />5-50 <br />Plastici Index (P.I.) less than 25 <br />Pressure Mains 6" and Larger <br />Particle Size Limitations <br />Sieve Size <br />% Passin <br />1 %z" <br />100 <br />#4 <br />10-100 <br />#200 <br />0-10 <br />Plastici Index (P.I.) less than 12 <br />Foundation Material (When Required) <br />Particle Size Limitations <br />Sieve Size <br />% Passin <br />1 '/z" <br />100 <br />#4 <br />10-50 <br />#200 <br />0-5 <br />Plastici Index (P.I.) less than 9 <br />Mechanically Tamned Backfill <br />Where specifically called for in these specifications or on the drawings, the material used in the <br />backfill process shall be uniformly, mechanically tamped, with hand oQerated pneumatic or <br />gasoline tools in 6" to 8" loose lifts, to 95% of standard Proctor density (ASTM 698) at slightly <br />above optimum moisture. Mechanical compaction shall extend to the finished ground surface. <br />The OWNER shall test at either their or the ENGINEERS discretion, and shall pay for all <br />passing density tests. The CONTRACTOR shall only pay for failed tests. <br />Pavement Subbase <br />Where the drawings allow the open cutting of streets and driveways having concrete, asphalt, <br />flexible base or other types of paving, mechanically tamped backfill shall be required beneath <br />such paving. <br />The mechanical tamping shall result in a subbase beneath pavement surfaces and flexible base <br />pavement material compacted to 95% of standard Proctor density (ASTM D 698). <br />Reinforcement of Adjacent Existing Utilities <br />Existing cast iron, or pressurized PVC utilities approximately at right angles to this <br />CONTRACTOR'S trench, will not require additional support or protection, other than the <br />exercise of care in placing new facilities adjacent to same, and in placing backfill, except when <br />85 <br />