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TECHNICAL MEMORANDUM Page 2 June 3, 1992 SAC31583.AC.ZZ Preparation of this technical memorandum to summarize the exploration methods, subsurface conditions, and results of stability and settlement analyses Site- Description Forward Landfill is located at 9999 South Austin Road, in San Joaquin County, about 7 miles southeast of Stockton, California. The existing landfill includes waste management units (MWUs) for waste treatment and/or disposal, a transfer station/resource recovery facility for separating, sorting, and recycling activities, and storage and support areas. Several MWUs at the Forward Landfill are currently in operation. The Forward Landfill site is divided by the South Fork of South Littlejohns Creek (South Fork), as shown in Figure 1 (attached). Other than the South Fork and existing MWUs, the site is relatively level, with ground surface elevations ranging from 33 feet to 40 feet above mean sea level (msl). Project Description The proposed extension of Forward Landfill includes placement of additional waste fill material over approximately 80 acres, extending from the South Fork to the north property line and from existing WMUs D-88, D-89, and E to the west property line. Refuse will also be placed in the area south of the South Fork. Figure 1, attached, shows the proposed landfill extension configuration. As shown in this Figure, the proposed landfill extension will include placement of additional waste fill material over some existing WUs. The proposed landfill extension plans currently include placement of a maximum of approximately 200 feet of refuse fill over an 80 acre area. Prior to constructing the liner and placing refuse fill, most of the site will be excavated to a depth of approximately 25 feet below the existing ground surface (approximately elevation 15 feet). The proposed base excavation plan extends from approximately WMU D-89 to the west property line, and from South Little Johns Creek to the north property line. The approximate limits of the proposed future base excavation are shown in Figure 1. The proposed future base excavation will provide native soil for the clay liner construction and for daily cover material. The cut slopes for the proposed base excavation are 3:1 (Horizontal to Vertical). The base excavation and cut slopes for the proposed base excavation area will be lined with