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The landfill cross sections, shown on Drawing 3, illustrate the general relationship <br />between the existing ground, excavation subgrade, final landfill surface profiles, <br />perimeter berm(s), and fill advancement direction with the modules. The four - <br />working -face detail shown on Drawing 3 highlights the refuse placement method <br />and lift construction. Generally, only one face is actually open at a time. The ac- <br />tive face advancement will be skewed in the direction of fill placement to promote <br />drainage. <br />5.2 SITE CAPACITY AND SERVICE LIFE <br />The site design capacity is approximately 17,300,000 yards based on the landfill <br />development plans (see Drawings 1 through 4). Estimates of waste capacity, <br />earthwork, and soil cover requirements are presented on Table 5-1. <br />The service life of the landfill, 36 years, was calculated based on County devel- <br />oped wastestream information and assuming a 3 percent annual increase in <br />waste generation (see Table 5-2). <br />Idlik <br />5.3 EARTHWORK <br />Earthwork for the project includes the excavation of on-site soils, construction of <br />earthfill for the roadway and perimeter berm, and preparation of the soil stockpile <br />and screening berm. <br />5.3.1 Excavation <br />The site will be excavated within the limit lines and to the base of excavation <br />contours shown on Drawing 2. In general, the excavated soils will be suitable for <br />direct use as daily and intermediate soil cover. Selected soils intended for use as <br />final cover will be clayey or silty soils with a permeability of 1 x 10-6 cm/sec or <br />less. These soils may be placed directly as needed or stockpiled in locations as <br />shown on Drawing 1. <br />The perimeter side slopes will be excavated at 3:1 (horizontal to vertical) to an <br />average excavation depth of 30 feet. Based on the hydrogeologic investigations <br />