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<br />High Rock Road Waste and Recycling Center Improvements 31 20 00 - 6 <br />Orange County, North Carolina JULY 2021 <br />DAA PN: R00592-213N <br /> <br />1. Stockpile soil materials away from edge of excavations. Do not store <br />within drip line of remaining trees. <br />3.9 UTILITY TRENCH BACKFILL <br />A. Place backfill on subgrades free of mud, frost, snow, or ice . <br />B. Place and compact bedding course on trench bottoms and where indicated. <br />Shape bedding course to provide continuous support for bells, joints, and <br />barrels of pipes and for joints, fittings, and bodies of conduits. <br />C. Place and compact initial backfill of subbase material, free of particles large r <br />than 1 inch in any dimension, to a height of 12 inches over the utility pipe or <br />conduit. <br />1. Carefully compact initial backfill under pipe haunches and compact evenly <br />up on both sides and along the full length of utility piping or conduit to <br />avoid damage or displacement of piping or conduit. Coordinate backfilling <br />with utilities testing. <br />D. Place and compact final backfill of satisfactory soil to final subgrade elevation. <br />E. Install warning tape directly above utilities, 12 inches below finished grade, <br />except 6 inches below subgrade under pavements and slabs. <br />3.10 SOIL FILL <br />A. Plow, scarify, bench, or break up sloped surfaces steeper than 1 vertical to 4 <br />horizontal so fill material will bond with existing material. <br />B. Place and compact fill material in layers to required elevations as foll ows: <br />1. Under grass and planted areas, use satisfactory soil materia l. <br />2. Under walks and pavements, use satisfactory soil material. <br />3. Under building slabs, use engineered fill. <br />4. Under footings and foundations, use engineered fill. <br />3.11 SOIL MOISTURE CONTROL <br />A. Uniformly moisten or aerate subgrade and each subsequent fill or backfill soil <br />layer before compaction to within 2 percent of optimum moisture content. <br />1. Do not place backfill or fill soil material on surfaces that are muddy, frozen, <br />or contain frost or ice. <br />DocuSign Envelope ID: BBF56E0A-3618-497E-AA70-92F097E8F598