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0 <br />�' <br />� <br />,� <br />�QQ = RENCH EXCAVATION AND BACKFILL FOR UTILITIES <br />601.000 ENERAL <br />600-1 <br />This specification covers trench exeavation, speeial pipe foundations, <br />pipe bedding and trench backfill. All trenching work will be done in <br />aceordanee with O.S.H.A, regulations. <br />602.q00 MATERIALS <br />602.100 Granular Materials <br />Granular materials furnished for foundation, bedding, backfill, or <br />other purposes as may be speeified shall consist of any na�ural or <br />synthetie mineral aggregate such as sand, gravel, erushed rock, erushed <br />stone, or slag� that shall be so graded as to meet the gradation <br />requirements specified herein for each particular use. <br />602.101 Granular Material Gradation Classifications <br />Granular materials furnished for use in foundation, bedding, <br />� encasement, or backfill in pipe eonstruetion shall conform to the <br />folloWing requirements: <br />�. <br />� <br />,�, <br />Percent Passing MATERIALS USE DESIGNATION <br />Sieve Size Foundation BeddinR Backfill <br />3 inc h . <br />2 inch <br />1 inch <br />3/4 <br />3/8 <br />�4 <br />�10 <br />�40 <br />#200 <br />100 <br />85-100 <br />30-60 <br />0-10 <br />� 602.102 Cra_ nular Material Use Desianations <br />100 <br />90-100 <br />50-90 <br />35-80 <br />20-65 <br />0-50 <br />0-15 <br />100 <br />35-100 <br />20-100 <br />0-50 <br />0-35 <br />Granular materials provided for Foundation, Bedding or Backfill uge as <br />� required by the Contractor in pipe construction, either as part of the <br />pipe item work unit or as a separate Contract Item, shall be elassified <br />as to Use in accordance with the following: <br />� <br />� <br />� <br />MATERIAL USE DESTGNATIOtJ ZONE I�ESTGNATTON <br />Granular Foundation ----- Plaeed below the bottom of i e <br />p p grade as <br />placement for unsuitable or unstable <br />soil�, to achieve better foundation <br />support. <br />Granular Bedding --_-__ place below the pipe midpoint, prior to <br />pipe installation� to facilitate proper <br />shaping and aehieve uniform pipe support. <br />