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<br />SECfION 600 <br /> <br />TRENCH EXCA V A TION AND BACKFILL FOR UTll..ITIES <br /> <br />601.0 GENERAL <br /> <br />This specification covers trench excavation, special pipe foundations, pipe bedding and <br />trench backfill. All trenching work will be done in accordance with O.S.H.A. <br />regulations. <br /> <br />602.0 MATERIALS <br /> <br />. <br />602.100 GRANULAR MATERIALS <br /> <br />i <br />J <br />j <br />i <br />J <br />J <br />J <br />j <br />.J <br />.J <br />J <br />J <br /> <br />Granular materials furnished for foundation, bedding, backfill, or other purposes as may <br />be specified shall consist of any natural or synthetic mineral aggregate such as sand, <br />gravel, crushed rock, crushed stone, or slag, that shall be so graded as to meet the <br />gradation requirements specified herein for each particular use. <br /> <br />602.101 GRANULAR MATERIAL GRADATION CLASSIFICATIONS <br /> <br />Granular materials furnished for use in foundation, bedding, encasement, or backfill in <br />pipe construction shall conform to the following requirements: <br /> <br />Percent. Passing Foundation Materials Use Designation <br />Sieve Size <br /> Bedding Backfill <br />3" <br />2" <br />I" 100 100 .100 <br />3/4" 85-100 90-100 <br />3/8" 30-60 50-90 <br />#4 0-10 35-80 35-100 <br />#10 20-65 20-100 <br />#40 0-50 0-50 <br />#200 0-15 0-35 <br /> <br />600-1 <br />