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5.3.1.4. Engineering and Chemical Properties of Soil <br /> Soil samples were collected and analyzed on three separate occasions (by Kleinfelder in 1985, <br /> 1990, and 2004). Laboratory testing included: moisture content, unit weight, sieve size/gradation <br /> analyses, moisture density, plasticity index, dry density, hydraulic conductivities, and Atterberg <br /> Limits. Soil properties are summarized below. <br /> • Dry unit weights of soil samples varied between 73 to 82 pounds per cubic foot <br /> • Moisture contents ranged from 9 to 41% <br /> • Plasticity limits ranged from 8 to 29 <br /> • Liquid limit of soil ranged from 35 to 45 <br /> • Soil descriptions based on the gradation analyses were summarized in Section 5.3.1.2 <br /> • Hydraulic conductivities are summarized in Section 5.4.2.1. <br /> The results of the laboratory testing are presented in the May 17, 1985, January 2, 1991, and <br /> September 21, 2004 reports. <br /> Kleinfelder tested chemical properties of soils in September 2004 with respect to the suitability <br /> of the soil to support plant growth. Potassium, calcium, and magnesium concentrations were <br /> summarized as adequate while nitrate, phosphorus, sulfur, and boron concentrations were <br /> summarized as low or very low for plant growth. <br /> 5.3.1.5. Stability Analysis <br /> Stability analysis calculations (factor of safety, critical slope, etc.) are prepared during the design <br /> of each module and provided to the regulatory agencies for review. <br /> Stability analysis have been performed for the overall refuse slope stability of Module "I" and 1, <br /> and the long-term partial cover of Module "I". The refuse fill, and cover soils were found to be <br /> stable under design conditions (Kleinfelder, 2004, Emcon, 2002. <br /> Foothill Sanitary Landfill Page 24 of 62 Public Works/Solid Waste <br /> JTD County of San Joaquin—Revised 10/6/05 <br />