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on the Drawings and set forth in the Specifications, or as <br />• specified by the Engineer. <br />Type 4 soils shall be utilized for the cmnstruction of <br />collection pond berms, tailings embankments, access roads, and <br />other structures. Type 4 fill shall consist of inorganic soils <br />with a maximum six-inch rock size and may include relatively <br />fine-grained rock fills, sand and gravel, sandy soils, and <br />silty or clayey soils. In structures to be constructed of <br />compacted materials such as the pond berms and access roads, <br />the Type 4 fill shall be placed in 12-inch maximum loose lifts <br />within three percent of optimum moisture content, and compacted <br />to 95 percent of maximum dry density (ASTM D-698). Oversized <br />rock shall be removed to the downstream exterior slopes (in <br />the case of pond berm fill) for slope protection. Pond interior <br />slopes shall have maximum 3/4-inch rock size in preparation <br />for synthetic material placement. Type 4 materials placed <br />within the main and splitter embankments shall be placed in <br />• ~ five-ft maximum loose lifts and compacted by haul truck traffic <br />to a minimum density of 85 percent of maximum dry density (ASTM <br />D-698). <br />Type 4 fill adjacent to culverts shall be placed in <br />eight-inch maximum loose lifts within two percent of optimum <br />moisture content and compacted to 95 percent a~f maximum dry <br />density (ASTM D-698) using hand tampers. The maximum rock size <br />allowed in contact with culverts shall be 1-1/f' inches. <br />6.3 Road Base Fill <br />Road base fill shall consist of free draining, durable sands, <br />and gravels with an LA abrasion of less than 50 percent (500 rev.). <br />Road base fill may be processed locally from mine pit excavations <br />of waste rock or off-site sources. Road base fill shall be placed <br />in eight-inch maximum loose lifts, wetted as approved by the <br />• <br />24 <br />