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---- - - RR I KIEt:\ EEII)iK 34.3 feet to 39 feet below the surrounding ground surface. One possible explanation is that area C on Plate 2-2 was excavated 10 to 14 feet deeper during the period from 1973 to 1983. An aerial photograph taken in 1983 was used as a basis for preparing Plate 2-4. A number of significant changes have occurred between 1977 and 1983. The 21-acre parcel was split in 1979 when Cove Contractors purchased the southern half from California Clay Products. Area B has been filled to grade. ASW was disposed in areas A, B, C and D until 1982 when disposal at the site stopped. Also between 1977 and 1983 area E was formed. As can be seen from previous plates, this area was not excavated. Cove Contractors removed soil from area E for use as cover in other portions of the site. Water has collected in the bottom of area E. All but two of the structures on the California Clay Products parcel were. removed. The present state of the site is shown on Plate 2-5. There are only two significant changes from 1983. The water in area E has dried u . The bottom is approximately 26 feet below the surrounding ground surface. Also, a surface impoundment was installed on the former California Clay Products parcel over a portion of disposal area B. The size and location of the impoundment is approximate, based on observations taken during a visit to the Cove Contractors site in 1990. A study was conducted by Kleinfelder in 1988 (Reference 1-3) to assess if there were PCBs in the ASW and if those PCBs posed a threat to ground water quality. Twenty-eight samples were analyzed and none exceeded the TTLC of 50 mg/kg. Waste Extraction Test (WET) and deionized WET extractions were run on the three most concentrated samples. In all cases, no PCBs were detected in the extract at a detection limit of 1 ug/l. 2.2 TYPES, QUANTITIES, AND CONCENTRATIONS OF WASTES PROPOSED FOR DISPOSAL Waste Types: Cove Contractors proposed to accept ASW from auto shredding facilities located in the San Francisco Bay area, and inert waste from selected sources. CR4-90-25 5 Copyright 1990 Kleinfelder, Inc.