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The landfill cross sections, shown on Drawing 3, illustrate the gen- <br />eral relationship between the existing ground, excavation subgrade, <br />final landfill surface profiles, perimeter berm(s), and fill advance- <br />ment direction within the modules. The four -working -face detail shown <br />on Drawing 3 highlights the refuse placement method and lift construc- <br />tion. The active face advancement will be skewed in the direction of <br />fill placement to promote drainage. <br />4.2 SITE CAPACITY AND SERVICE LIFE <br />Estimates of waste capacity, earthwork, and soil cover requirements <br />are presented in Table 1. Based on the stated assumptions, the site <br />has a refuse capacity of 17,300,000 cubic yards. <br />The sanitary landfill service life is calculated based on a comparison <br />of projected waste generation rates (increased by 3 percent a year <br />according to Harney Lane Sanitary Landfill records) and the refuse <br />capacity of the landfill. The landfill service life is approximately <br />36 years. <br />4.3 EARTHWORK <br />Earthwork for the project includes the excavation of on-site soils, <br />construction of earthfill for the roadway and perimeter berm, and <br />preparation of the soil stockpile and screening berm. <br />GAS <br />The site will be excavated within the limit lines and to the base of <br />excavation contours shown on Drawing 2. In general, the excavated <br />soils will be suitable for direct use as daily and intermediate soil <br />cover. Selected soils intended for use as final cover will be clayey <br />or silty soils with a permeability of 1 x 10-6 cm/sec or less. These <br />soils may be placed directly as needed or stockpiled in locations as <br />shown on Drawing 1. <br />• . •1 1•,A fli 12 <br />