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1 INTRODUCTION <br />The North County Recycling Center and Sanitary Landfill (NCRC&SL) is a Class III <br />waste management unit owned and operated by the San Joaquin County Public Works <br />Department, Solid Waste Division (the County). The site is located in northeastern San <br />Joaquin County. The landfill is comprised of 11 modules (Modules 1 through 11), each <br />constructed on an as -needed basis. Modules 1 through 4 have already been constructed <br />and waste disposal activities have taken place in these modules. Each of these existing <br />modules has been constructed with base liner systems that include a 60 -mil high-density <br />polyethylene (HDPE) geomembrane and leachate collection and removal systems. <br />The currently permitted maximum landfill elevation is 219 feet. -Consistent with the <br />approved 2006 Final Environmental Impact Report, the County is proposing a vertical <br />expansion of the landfill to increase the maximum elevation to 320 feet. This report <br />presents the results of the geotechnical analyses performed by Shaw Environmental, Inc. <br />(Shaw) for the vertical expansion of NCRC&SL. The report addresses the following <br />geotechnical issues: <br />Y Static and Seismic Slope Stability Analyses <br />—Global slope stability of existing modules <br />—Global slope stability of future modules <br />—Interim slope stability of future modules <br />• Structural design of leachate collection pipes: <br />—Check of the adequacy of existing pipes in Modules 1, 3, and 4 to support the <br />additional waste loading from the vertical expansion <br />—Design of pipes to be used in the future Modules 5 through 11 <br />• Flow capacity of geonet/geocomposite drains <br />—Check of the adequacy of existing geonet drains in Modules 1 and 3, and also <br />the existing geocomposite drain on the sideslopes of Module 4 <br />—Design of the'geocomposite drain to be installed on the sideslopes of the future <br />Modules 5 through 11 <br />Geotechnical Analyses for NCRCSL <br />Shaw Enviromnental, Inc. <br />1-1 <br />Department of Public Works/Solid Waste <br />County of San Joaquin — December 12, 2007 <br />