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KLEINFELDER <br /> 4 SOIL BORROW <br /> 4.1 BORROW INVESTIGATION <br /> Kleinfelder performed a borrow investigation in 1987, which was included in the original <br /> Closure Plan. Since the time of the 1987 investigation, the landfill has reached final grade and <br /> approximately 70 percent of the material from the borrow area has been used for daily cover <br /> and foundation material. The remaining material quantities are insufficient to satisfy the total <br /> quantities required for final cover. In addition, the remaining material does not exhibit the <br /> quality needed to construct the barrier layer unless admixtures are used. <br /> Kleinfelder was retained by the SJDPW to perform an investigation of currently available on- <br /> site soils and to design a mix for producing the soil needed to construct the barrier layer. The <br /> design approach for the mixing project is to mix commercial clay soil from North American <br /> Refractories Ione, California, or a comparable source with on-site soil to meet the <br /> requirements of Chapter 15 for the barrier layer soil. See Section 2.4 for a detailed <br /> description of the mix design. <br /> 4.2 OPERATIONS <br /> 4.2.1 Construction Methods <br /> The soil for the final cover will be transported from the borrow area by scraper or truck to the <br /> area of placement or the mixing area for the barrier layer material. Additional information on <br /> construction methods is contained in Section 6.2.2. <br /> 4.2.2 Control <br /> The SJDPW will provide grade control of the excavation to achieve drainage of the <br /> excavations. <br /> GSM.-MD 3EI94 Page 13 of 24 <br /> Copyright 1994 Kleinfelder,Inc. <br />