FIELD DOCUMENTS AND WORK PLANS 1987

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• 0 0 • Mr. Ed Steffani , General Manager -2- 29 January 1987 Extent of Pollution Caused by MCTC Investigations by Marley, Department of Health Services, and the Regional Board in the early 1980s showed soil and ground water at the site contaminated with treat- ing chemicals. In December 1984, the California Department of Health Services (DHS), the Central Valley Regional Water Quality Control Board (Regional hoard) , and the Marley Cooling Tower Company reached a Settlement Agreement concerning the site. The Agreement required certain interim corrective measures be taken by December, 1984. In addition, an investigative program to determine the extent of soil and ground water contamination was required. The Environmental Protection Agency (EPA) is also involved to assure MCTC is in compliance with Federal regula- tions. Initial results of the soil investigation indicate contamination in the immediate area of the retort and contamination in the bottom of the stormwater retention pond. The initial results of the ground water assessment investigation indicate concentrations of chromium in the immediate vicinity of the treatment plant, with rapidly decreasing concentrations to the property line. Chromium has been detected in the ground water monitoring wells off-site at levels in excess of the safe drinking water standard of 0.05 mg/1 . However, tests conducted on domestic wells near the facility showed trace amounts of chromium below the safe drinking water standard. We will continue to require MCTC to sample the off-site monitoring and domestic wells until the threat to water quality is remediated. MCTC has been working cooperatively with the Department of Health Services, the Environmental Protection Agency, and the Regional Board to cleanup the pollution associated with xhe wood treatment operation at their site. MCTC Surface Water Discharge In ,January 1986, the Board issued MCTC an National Pollutant Discharge Elimination System (NPDES) permit (copy enclosed) to discharge treated stormwater runoff to the Stockton diverting canal which flows into the Calaveras River. Any contam- inants present in the stormwater will be removed by an ion exchange treatment system down to levels which should protect all beneficial uses of the receiving water body. A Community Relations Plan has been developed and implemented to ensure informa- tion is available to the public. Telephone contact has been made with elected officials, regulatory agencies, and concerned citizen groups. A repository of information, including the settlement agreement and site investigation plans, is available at the Stockton Public Library. If you like, we will add your name to the mailing list of people who receive information regarding the MCTC site activities.