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KLEINFELDER amounts of free particulate asbestos fiber. Additionally, in a memorandum dated October 21, (� 1987, the Central Valley Regional Water Quality Control Board (CVRWQCB) stated that even 7 though the pond sediments contain greater that one percent asbestos, DHS does not consider the sediments to be hazardous waste since the asbestos fibers are bound into a silica gel. 2.1.2 Quantity of Waste A total of approximately 480,000 cubic yards of waste is estimated to be in place in 6 WMUs at the J-M Mfg. site. This estimate was obtained from the Kleinfelder SWAT Proposal dated March 1, 1989. 2.1.3 Character of Waste During the SWAT investigation, surface impoundment sediments were collected and analyzed. No volatile organic compounds were detected. Three metals were detected in a Deionized Water Waste Extraction Test (DI-WET) extract of the sediments; aluminum, chromium and hexavalent chromium. Hexavalent chromium was reported at the detection limit of 0.01 mg/l. Total chromium was detected at approximately 0.03 mg/1. No samples of solid waste in the landfill were collected or analyzed in the SWAT investigation, but chemical characteristics of the waste can be inferred from ground water monitoring results. Semi-annual monitoring of the ground water in the SWAT investigation from 4 on-site wells (Drawing 1) during 1989 and 1990 did not indicate that the ground water, which is approximately 35 to 40 feet below ground surface, has been affected by the landfills or surface impoundments at the facility. Volatile organic compounds do not appear to be present in the ground water under the site. Toluene was detected at 0.7 ug/1, just above the detection limit of 0.5 ug/l, in MW-3 during June 1989. Chloroform was detected at the detection limit of 0.5 ug/l, in MW-2 and at 0.6 ug/1 in the sample blank during June. No other volatile organic compounds were detected in ground water at the site. It does not appear that the landfills or surface impoundments have caused an increase -in inorganic constituents concentrations in the downgradient wells. TDS concentrations were also highest in the upgradient well. It is Kleinfelder's opinion, based on the results of ground water monitoring and site records, that any constituents migrating from the WMUs have not affected local ground water quality. CR14-92-12 Page 5 of 39 24-220109-Fo9 copyright 1992 Kleinfelder, Inc.