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Mr. Darrell D. Scott <br /> Page 2. <br /> November 30, 1989 <br /> Environmental Laboratory, he concluded that the bioassay results <br /> were valid and need not be repeated. On November 21, 1989, DHS <br /> received additional corrosivity data (pH) pursuant to Section <br /> 66708, 22 CCR, on the eight sludge samples. <br /> Review of the analytical data showed the sludge generated by the <br /> wastewater treatment plant did npt contain any inorganic persistent <br /> and bioaccumulative toxic substances at concentrations exceeding <br /> any of the established regulatory threshold limits and was not <br /> acutely toxic as measured by the aquatic bioassay. Trace levels <br /> of PCBs (slightly above the limit of detection of 0.1 mg/kg) were <br /> detected in three of the eight samples and semi-volatile organic <br /> analyses on all eight samples revealed levels of bis (2-ethylhexyl) <br /> phthalate ranging from 1700-5300 ug/kg (ppb) , neither of which <br /> would classify this sludge as hazardous. In addition, the sludge <br /> did not exhibit the characteristic of corrosivity. <br /> Based on the information provided, the Department is classifying <br /> the sludge from the wastewater treatment plant as nonhazardous. <br /> In the event that future data do not support the present <br /> nonhazardous waste classification, the City of Tracy will be <br /> required to manage this waste in full compliance with 22 CCR <br /> requirements. The management of this sludge remains subject to the <br /> regulation of the Regional Water Quality Control Board and local <br /> authorities. <br /> Questions regarding this classification may be directed to Mr. <br /> Pilorin of my staff at the above letterhead address or telephone <br /> number. <br /> Sincerely, <br /> Caryn Woodhouse <br /> Alternative Technology Division <br /> Toxic Substances Control Program <br /> cc: See next page <br />