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4A 0. .9. Engineering and Chemical Properties of Soil <br />Soil samples were collected and analyzed by Kleinfelder in 1985 <br />(Appendix ? a1,D) and. --1990 (Appendix Ej. , ^d2nnn ieh .,di.. 22)) Laboratory testing <br />included= moisture content, unit weight, sieve size/gradation analyses, moisture density, <br />plasticity index, dry density, hydraulic conductivities, and Atterberg Limits. Soil properties are <br />ad helewas follows: <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 />6.3.1..2 <br />4.10.1 .9.1 _ Stability Analysis <br />Reguirements for seismic stability are found in Title 27 Chapter 3 Subchapter 5 <br />addressing requirements for landfill closure. According to Section 21090 of that <br />subchapter, " Designs having any slopes steeper than a horizontal to vertical ratio of three to <br />one, or having a geosynthetic component [under ¶-(a) 2)] shall have these aspects of their design <br />specificallysupported in the slope stability report required under §21750(_f)(5) (emphasis <br />added). Because the design slopes of the final landfill configuration is less than three to <br />one (Figure 6), it does not appear that stability analysis is required. <br />The landfill is located in an area of low seismicity (AeidixAppendix F). Stability <br />analysis has 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 <br />to be stable under design conditions (Appendix F ^hark if seismin nnlnc aFe 4here) <br />Foothill Sanitary Landfill Page 34 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />