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G Through use of landfill compactors, initial compacted refuse densities of 1,200 pounds per cubic yard have been attained in the Corral Hollow site, and further densification has occurred due to surcharge loading by successive refuse lifts. In addition, operational controls result in a relatively uniform fill (no waste segregation). Although that factor and the high density will tend to minimize differential settle- ment within the landfill, significant settlements of the total refuse thickness can be anticipated. Since disposal operations have been conducted at the Corral Hollow site for approximately 20 years, much of the refuse placed at the site has already settled. Although future settlement can be anticipated, it should be relatively uniform. The landfill configuration should remain intact. The minimum final surface slopes, shown on Drawing 1, were designed to accommodate drainage of the completed landfill, given minor differential settlement conditions. To protect the final cover's integrity, the area will be periodically observed and main- tained. FINAL COVER The final cover will be placed when the refuse fill areas are at final grade. The final cover should be constructed by spreading the speci- fied type of soil in uniform layers not over 8 inches thick. Each soil layer should be watered or dried as needed to bring the soil as close as practicable to the optimum moisture content, and then com- pacted with suitable equipment to at least 90 percent relative compac- tion (ASTM Test Designation D1557-70). At a minimum, the final cover will consist of the following: • A 2 -foot -thick (minimum) compacted soil final cover foundation layer (1 foot placed as intermediate cover) • A 1 -foot -thick (minimum) compa�ted low -permeability soil layer (permeability of 1 x 10- cm/sec or less) over the foundation PJ9 9390310.00D 15 cmrnn Gce^�i�4e�