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' Carbon Clay. These soils generally correlate to a CL or CH in the Unified Soil Classification System. Permeability is described as slow with rapid runoff in areas of significant slope. In 1985, Kleinfelder installed three groundwater-monitoring wells adjacent to the surface impoundments on site (Kleinfelder report no. S-2594-1, dated June 7, 1985). The borings were ' advanced to depths of 50 to 90 feet below grade. In general, the soils encountered consisted of alternating clays and silts with minor sand and gravel lenses. Kleinfelder also drilled two soil borings (TW-1 and TW-2) to groundwater in March 2001, one near the existing 1 million gallon waste pond and near the proposed 114 million gallon pond. The depths of the soil borings were 121 feet below the ground surface (bgs) and 26 feet bgs ' respectively. The soils consisted of sandy silt and sand in the upper 110 feet bgs to sandy clay and clay to 120 feet bgs in TW-1. The soils in TW-2 consisted of silty clay, silty sand, clayey sand, and sandy gravel to 21 feet bgs. Clay was encountered to 26 '/2 feet bgs. Kleinfelder has recently conducted a geotechnical assessment near the proposed dam areas of the ' proposed 114 million-gallon pond located on Section 4. This geotechnical assessment was titled "Geotechical and Design Engineering Services Report, Proposed Process, Water Storage Reservoir, Musco Olive Products, Tracy, California", dated August 14, 2002. This assessment ' included eleven (11) soil borings to depths ranging from 21 to 51 feet below ground surface (bgs). The soils encountered consisted predominantly of clays (CL) and silts (ML). Less frequent silty sands and sand lenses were also noted at depths generally greater than 10 feet, and usually between 2 to 5 feet thick. 2.4 LOCAL GROUNDWATER CONDITIONS Local groundwater conditions were obtained from various geotechnical borings, deep soil borings and onsite monitoring and production wells. Plates 3 and 4 show the approximate locations of these features. ' Three monitoring wells (W-1 through W-3) were installed by Kleinfelder in 1985 near the perimeter of two existing surface impoundments (Section 34). No free groundwater was encountered in borings W-1 and W-3 to a depth of 90 feet. What was described as a perched groundwater condition was encountered in boring W-2 at a depth of approximately 29 feet. According to the 1985 Kleinfelder report previously mentioned, during installation of the production well for the Musco Olive facility, groundwater was encountered at a depth greater than 250 feet, rising to within approximately 50 to 60 feet of the surface. ' Kleinfelder conducted a hydrogeologic assessment in March 2001 of both shallow and relatively deep groundwater below the site. Four shallow soil borings (GT-1 through GT-4) were advanced in the land application areas to an approximate depth of thirty (30) feet below the ground surface (Plate 3). One boring (GT-3) was advanced in the disposal field north of the Western Pacific ' Railroad, and one boring was advanced south of the processing facility (GT-4) in an area 12406/2002R160 Page of 13 Copyright 2002,Kleinfelder,Inc. February 20,2002 KLEINFELDER 2825 East Myrtle Street,Stockton,CA 95205-4794 12091 948-1345 12091948-0621 lax