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While the DWR inspection of the site indicated that Class I wastes had <br /> been accepted at CHSL, no definitive analyses were performed on the <br /> apparent drilling wastes and the pesticide containers. The drilling mud <br /> pond no longer exists. Furthermore, a FIT interview of CHSL personnel <br /> revealed that the contents of the pond were actually partially dewatered <br /> sludges from the City of Tracy's wastewater treatment facility. <br /> Approximately 6,125 cubic yards of sludge was disposed of at the <br /> facility between September 1981 and November 1982 (19). The facility <br /> stopped accepting sludge in 1986. <br /> In 1986, sludge from the City of Tracy's Sewage Treatment Plant was <br /> analyzed for pesticides and inorganic (including metals) constituents. <br /> It was found to contain zinc (110 parts per milli (ppm)), barium (17 <br /> ppm), copper (33 ppm), and lead (8 ppm) (20). In addition, it is <br /> possible that the sludge may have contained tond trichloroethane <br /> (mentioned earlier) since the sludge analyses did not address organic <br /> constituents. However, the sludge samples taken in 1986 may not reflect <br /> the actual contents of the sludge disposed of at CHSL prior to this <br /> date. The sampling results indicate that the sludge pond may be an <br /> on-site source of a hazardous waste stream. <br /> Landfill managers also stated that the pesticide containers had been <br /> g <br /> certified by County agriculture inspectors as triple-rinsed, making them <br /> acceptable wastes at a Class III disposal facility. CHSL continues to <br /> accept triple-rinsed pesticide containers (7). <br /> According to an inspection report filed by the San Joaquin Local Health <br /> District, there was also a one-time asbestos dumping event on March 12, <br /> 1982. The amount of asbestos accepted on that date is unknown (11). <br /> CERCLIS file information indicates that the landfill has also been used <br /> as a disposal site for box ink. A letter from a City of Tracy official <br /> to the manager of the Owens Illinois, Inc. paper plant in Tracy provided <br /> evidence that CHSL had been regularly used by Owens Illinois for ink <br /> disposal. Box ink is considered to be a hazardous substance by the U.S. <br /> 3-7 <br /> sa/tm/chl/si <br />