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9 I%W V Lathrop, California. PSE has designated this location as "Site 3058" . The plant area is about 2 acres and is located at the north of a 11.9±-acre area designated as Parcel A on PSE's parcel map, which is included on Plate 2. The plant area, also appears to be in the northern portion of a 10-acre area previously referred to as Parcel C in an environmental assessment report submitted by Woodward-Clyde Consultants (WCC) in June 1988. Site Topography. Natural topography in the area is relatively flat. The existing ground surface is about E1 +14 ft± (MSL datum) . Natural topography in the project area has been significantly altered by disposal activities associated with the adjacent LOF plant. Generalized surface topography, obtained by PSE's surveyors, is shown on Plate 2. Based on this topography, the site generally slopes from east to west and there is about 2 ft of elevation difference across the "plant" area. The topography shown on Plate 2, however, does not reflect the hummocky micro- topography observed during field exploration in December 1988. Historic Site Usage. The proposed cogeneration project site has been used by LOF to dispose of waste materials from the nearby manufacturing facility (Woodward Clyde, Environmental Assessment, 1988) . Most of the waste apparently consisted of materials associated with the manufacture of glass and plastic windshields. Evidently the area was used as a waste burning area where glass by-products were dumped into trenches, burned, and then covered. The axis of most glass-filled trenches are thought to be oriented east-west. Other areas of the site are believed to have been used for waste storage piles as well as batch dust, cullet, and plastic storage. Site Observations, December 1988. The ground surface at the project site is typically rutted and hummocky. Six to 12 inches of surface relief within 10 to 15 ft distance is common. Occasional 12- to 18-inch depressions exist. Also 2- to 4-foot-high mounds of soil were present near the southwest and northeast corners of the site and near the center of the site. Most of the site is covered by a thin layer of soil mixed with variable amounts of broken glass. The percentage of glass intermixed with the surface layer typically appears to range from 10-15 percent up to 20-30 percent. Some structural steel and rubble was observed in the west central portion of the plant area. No large piles of glass appear to be within the proposed plant area, although subsurface man-made deposits of glass and glass ash are known to be 1144A/CC-9 'ff McClelland