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D. Install sleeves, to accommodate pipes and wires, under paving, hardscape areas, sidewalks, and paths. <br />Compact back fill around sleeves to 95% Modified Proctor Density within 2% of optimum moisture <br />contents in accordance with ASTM D1557. <br />3.1 EXCAVATION AND BACK FILL OF TRENCHES <br />A. Trench excavation shall as much as possible follow the layout shown on the drawings. Trenches shall be <br />straight in alignment and support pipe continuously on bottom of trench. Remove rocks and debris greater <br />than 1" in diameter. Over excavate as required for bedding material. <br />B. Depth of Trench (in landscape areas): <br />1. 12" minimum depth for Master Valve Conduit and Flow Sensor Conduit shall be laid on the trench <br />with a 4" separation. Provide locator tape 6" above the conduits. <br />2. <br />C. Depth of Trench (under asphalt paving or concrete): <br />1. Mater Valve and Flow Sensor Conduit: 24" from top of pipe to aggregate base. <br />a) Conduits located under asphalt paving or concrete shall be installed with the appropriate <br />sized sleeve and back fill with sand bedding (6" below pipe and 6" above pipe). <br />b) Compact back fill material in 6" lifts at 90% maximum density determined in accordance <br />with ASTM D1557 using manual or mechanical tamping device. <br />C) Flooding instead of tamping will not be allowed. <br />d) Under no circumstances shall truck wheels be used to compact backfill. <br />D. Width of Trench: <br />7" minimum. <br />E. Boring: <br />1. Boring will only be permitted where pipe must pass under an obstruction that cannot be avoided or <br />removed. Back fill shall match surrounding soil density and grain. Boring under existing paving, <br />sidewalks, or hard-scape may be permitted at contractor's own risk. Contractor is responsible for <br />any repairs or damage to such items at their own expense. <br />Back fill: <br />1. Back fill of trenches may not be done until The City of Santa Ana authorized representative has <br />reviewed the installation of the conduit. <br />a) Material: Excavated material is generally considered to be adequate for back fill <br />operations. Before beginning the back fill operation, insure that back fill material is free <br />from debris and rocks greater than 1" in diameter, and is not mixed with topsoil. These <br />materials after separated from back fill, shall be legally disposed of at contractor's <br />expense. <br />G. Bedding: <br />Bed pressure conduits with construction grade sand 6" above and 6" below pipe. Remaining back <br />fill may be as described above. <br />a) Bed all master valve and flow sensor conduit with construction grade sand 6" above and <br />6" below wires. <br />