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UNDERGROUND STORAGE T <br />Section 13215 — Page 12 <br />11 <br />2. Testing: Prior to excavating for new tank, perform testing of soil <br />in existing excavation to determine extent and quantity of existing <br />soil contaminated by fuel. Test shall be performed by drilling four <br />4 inch diameter core holes, one at each bottom corner of excavation, <br />to a depth of 10 feet each. Contractor shall then obtain and pay for <br />an independent testing agency approved by the State; to determine <br />extent of fuel contamination of the soil. <br />3. Unit Price Bid Items for Fuel Contaminated Soil and Water: Remove <br />and dispose of fuel contaminated soil and water. Refer to Proposal <br />Form and Section 01025. Unit prices include all work for each item; <br />each cubic yard includes removal, hauling, disposal, and replacement <br />back fill material. Dispose of at a Class 1 Waste Site; approximate <br />hauling distance 150 miles. <br />B. Excavation: <br />1. General: Vertical construction, 6" clear between pipes in same trench, <br />width of trench not to exceed pipe dimensions by 9" on each side. If no <br />elevations shown, excavate to provide min 2°-6" cover from top of pipe, <br />conduit or tank to finished grade. Pipe below roadway with less than <br />2°-6" of cover to have concrete encasement of 4" min thickness. <br />2. Machine Excavation: Excavate 6" min below grade line. Place bed of <br />sand or 1/2" max size gravel and compact to grade, firm support and <br />uniform bearing for bottom 90 degrees of pipe circumference; use sand <br />only for wrapped or coated pipe. <br />3. Bell Holes: Hand shape bell holes for bell and spigot and coupled pipe, <br />so bell or coupling does not bear weight of pipe. Do not dig more than <br />6 bell holes ahead of pipe laying operations. <br />4. Safety Precautions: Provide safety shoring, bracing, or bulkheading to <br />support excavations; maintain warning signs and barricades. Provide <br />temporary wood or steel plate covers over excavations crossing roadways <br />or walks. Keep excavations free of water. Safeguard public health and <br />property in disposal of water. <br />5. Protection of Trees: Excavate adjacent to trees by hand to avoid injury <br />to trees and roots. Protect roots 2" dia and larger with heavy burlap. <br />Hand trim roots smaller than 2" adjacent to trees. Seal cuts through <br />roots 1/2" and larger with tree trimmers asphaltic emulsion. If trenches <br />remain open more than 24 hours, shade site of trench adjacent to tree <br />with burlap and keep damp. Do not stockpile materials within drip line <br />of trees. <br />C. Backfilling. <br />1. General: Do not place backfill until work has been inspected, tested <br />and approved. Backfill in 6" layers and bring up evenly on both sides <br />of pipe or structure. Compact by hand or with pneumatic hand tamper to <br />not less than 90% relative compaction per Test Method Calif !216. Equip— <br />ment compaction, flooding or puddling not permitted except upon written <br />approval. <br />Do not backfill concrete structures until concrete has set sufficiently <br />so as not to be disturbed. <br />R061187:ds :la:ds :ds :ds MAR 702 <br />