STL LANDSCAPE, INC - 2018 - Laserfiche WebLink

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D. Install sleeves, to accommodate pipes and wires, under paving, hardscape areas, sidewalks, and paths. Compact back fill around sleeves to 95% Modified Proctor Density within 2% of optimum moisture contents in accordance with ASTM D1557. 3.1 EXCAVATION AND BACK FILL OF TRENCHES A. Trench excavation shall as much as possible follow the layout shown on the drawings. Trenches shall be straight in alignment and support pipe continuously on bottom of trench. Remove rocks and debris greater than 1" in diameter. Over excavate as required for bedding material. B. Depth of Trench (in landscape areas): 1. 12" minimum depth for Master Valve Conduit and Flow Sensor Conduit shall be laid on the trench with a 4" separation. Provide locator tape 6" above the conduits. 2. C. Depth of Trench (under asphalt paving or concrete): Mater Valve and Flow Sensor Conduit: 24" from top of pipe to aggregate base. a) Conduits located under asphalt paving or concrete shall be installed with the appropriate sized sleeve and back fill with sand bedding (6" below pipe and 6" above pipe). b) Compact back fill material in 6" lifts at 90% maximum density determined in accordance with ASTM D1557 using manual or mechanical tamping device. c) Flooding instead of tamping will not be allowed. d) Under no circumstances shall truck wheels be used to compact backfill. D. Width of Trench: 7" minimum. E. Boring: Boring will only be permitted where pipe must pass under an obstruction that cannot be avoided or removed. Back fill shall match surrounding soil density and grain. Boring under existing paving, sidewalks, or hard-scape may be permitted at contractor's own risk. Contractor is responsible for any repairs or damage to such items at their own expense. Back fill: Back fill of trenches may not be done until The City of Santa Ana authorized representative has reviewed the installation of the conduit. a) Material: Excavated material is generally considered to be adequate for back fill operations. Before beginning the back fill operation, insure that back fill material is free from debris and rocks greater than 1" in diameter, and is not mixed with topsoil. These materials after separated from back fill, shall be legally disposed of at contractor's expense. G. Bedding: Bed pressure conduits with construction grade sand 6" above and 6" below pipe. Remaining back fill may be as described above. a) Bed all master valve and flow sensor conduit with construction grade sand 6" above and 6" below wires. City of Santa Ana RFP 17-127 Page 16