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9710MEEMMMIM <br />Mr. Steve Rosenbaum <br />Regional Water Quality Control Board <br />Central Valley Region <br />3443 Routier Road <br />Sacramento, CA 95827-3098 <br />IIE: Final Construction Report, Lower Triangle - Pit D82 <br />Iear Steve: <br />GINIIN 73 <br />0 1 JJIMW <br />0 1 JJIMW <br />and operating properly prior to the final burial. <br />The initial construction in the pit involved recompacting the liner and placing <br />a vapor barrier over the clay. After removing weeds and vegetation the liner <br />surface was wetted and scarified to remediate desiccation cracks formed <br />since the disposal pit was constructed. Additional liner soil was placed over <br />the floor to supplement the bottom liner at the periphery of the pit to <br />construct a 1.5% bottom slope rather than the 1.0% original slope. The liner <br />was recompacted, graded and several density tests were performed by <br />Kleinfelder to insure adequate compaction was attained. A 10 mil plastic <br />vapor barrier was placed over the clay liner and overlapped onto the surface <br />collection trench. Approximately 8 inches of soil was placed over the vapor <br />barrier as a protective layer. <br />Additional construction was done on the two leachate sumps located along <br />the western wall of Pit D88. The transfer pipe from the northern sump .Aias <br />removed from the sump, cleaned, replaced in the Christy box, and grouted. <br />The sides of both sump boxes were reinforced with steel and approximately <br />12 inches of additional concrete. The inside floor of the box was raised by <br />the addition of concrete to prevent the standing of leachate in the box. A <br />1/4 inch steel top was placed over the boxes and 12 inches of concrete <br />was poured as a cover. Filter rock was replaced around the sumps and the <br />area was covered with a layer of Supack 4.5 filter fabric. Approximately 6 <br />to 8 inches of sand was placed over the fabric as added filter material to aid <br />in preventing the filter blanket with clogging from excessive silt. <br />825 Sonoma Ave., Suite C Post Office 4600 Santa Rosa, California 95402 (707) 544-0784 FAX (707) 544-0866 <br />Also Auburn, California and Las Vegas, Nevada <br />