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TECHNICAL MEMORANDUM - <br /> Page 3 <br /> �t June 3, 1992 <br /> SAC31583.AC.ZZ <br /> a composite lining system consisting of flexible membrane lining (FML) underlain by a <br /> minimum 2-foot-thick compacted clay liner. In areas outside of the base excavation, refuse <br /> will be placed over existing waste material including an ash disposal pit (WMU E), an <br /> interim leachate impoundment facility (which will be closed prior to having refuse placed <br /> above it), and various other Class 2 and Class 3 WMUs containing various types of waste. <br /> The eastern ash disposal pit (WMU E) is lined with a 2- to 4-foot compacted clay liner at <br /> approximately elevation 15 feet. The location of WMU E is shown in Figure 1. <br /> The final cover for the proposed landfill extension will be benched to control surface <br /> drainage and reduce erosion. The vertical distance between benches will be 50 feet. The <br /> maximum slope between benches will be 3 to 1; the effective overall slope of the cap will be <br /> 3.3:1. <br /> The project also includes two sedimentation basins and leachate impoundments. As shown <br /> in Figure 1,.these sedimentation basins and leachate impoundments are are located near the <br /> creek. <br /> Previous Explorations <br /> A subsurface exploration was performed by ECON Associates in 1972 om 38 feet to 178 to evaluate the it <br /> conditions at the Forward Landfill site. borings,of 17 bongs, ranging <br /> feet in depth, were performed by EMCON. The approximate location of these 17 borings <br /> are shown in Figure 1. A Cone Penetrometer (CPT) exploration was performed by Insitu- <br /> Tech in 1987 in the WMU E area. The exact CPT locations are not known. <br /> Limitations <br /> This report has been prepared for the exclusive use of CH2M HILL and Forward, Inc. for <br /> specific application to the project described in this technical memorandum. Conclusions, <br /> recommendations, and results of engineering analyses presented in this technical <br /> memorandum are based on information obtained from the field exploration and from <br /> existing data. These results reflect subsurface conditions only at specific locations, times, and <br /> to the depths explored. Variations in subsurface conditions may not be revealed by these <br /> borings. <br /> This technical memorandum was prepared in accordance with generally accepted local <br /> geotechnical engineering practice. No other warranties.either expressed or implied are <br /> A <br />