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MARD V WASTECHNOLOGIES September 14, 1989 Ms. Pamela Johnson Department of Health Services 4250 Power Inn Road Sacramento, CA 95826 RE: WMU-A Closure Cap Certification, Forward Landfill, Stockton, CA lylnur PNm This letter is to inform you of the status of the closure construction for Waste Management Unit - A at the Forward Landfill, Stockton, CA and to certify the cap has been constructed in accordance with the closure documents and the provisions of Subchapter 15, Title 22, California Code of Regulations. We have completed the construction of the closure cap by placing a 2 foot compacted clay layer over the WMU compacted to a minimum of 90% of maximum laboratory density. Over the clay a topsoil layer with a minimum thickness of 18 inches has been placed and graded to a 3% slope to the east and a 4% slope to the west of a central ridge line. A total of 257 density tests were taken on the clay layer during it's placement with all tests showing the minimum relative compaction of 90%. An initial set of eight permeability tests were taken from the clay cap on August 22, 1989 resulting in permeabilities which range from 2.2 x 10-7 cm/sec to 6.0 x 10-8 cm/sec. The remaining five permeability tests are currently underway and the results of these tests will be included in the final construction report. Additional construction other than the placement of the cap is continuing and is expected to be completed by the end of September 1989. This construction includes the placement of the perimeter drainage facilities, the installation of a synthetic liner in the swale at the south end of the WMU, the final survey of the cap. Fertilizing and seeding of the top and side slopes of the waste management unit will be completed by November 1, 1989. 825 Sonoma Ave., Suite C Post Office 4600 Santa Rosa, California 95402 (707) 544-0784 FAX (707) 544-0866 Also Auburn, California and Las Vegas, Nevada