SITE INFORMATION AND CORRESPONDENCE

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-. � FILE COPY PUBLIC HEALTH SERVICES SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.P.H., Health Officer �lFpR 304 East Weber Avenue, Third Floor • Stockton, CA 95202 209/468-3420 MAR 3 0 2001 EDWARD NIEMANN 8709 N DAVIS ROAD STOCKTON CA 95209 RE: North Stockton Auto Service SITE CODE: 0786 8709 N. Davis Road Stockton CA 95209 On March 27, 2001 a meeting was held at the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) office to discuss the above referenced site. Present at the meeting were Mr. Edward Niemann and Mr. Henry Niemann from North Stockton Auto Service, Mr. Greg Stahl from Ground Zero Analysis, Inc., Ms. Cory Condon and Mr. Marty Hartzell from the Regional Water Quality Control Board, Central Valley Region.(CVRWQCB), and Ms. Margaret Lagorio, Ms. Dot Lofstrom and Ms. tori Duncan from PHS/EHD. The meeting was held at the request of PHS/EHD to discuss the petroleum hydrocarbon and volatile organics contamination discovered at this site following the removal of one 550 gallon underground storage tank that had been used to store waste oil. Site investigative activities to date include five geoprobe soil borings to document the lateral and vertical extent of the shallow soil contamination, an over-excavation of the former tank pit area to remove the residual soil contamination, and the advancement of one soil boring by hollow stem auger drilling method to collect a grab groundwater sample. Results of these field activities indicate that soil contamination was restricted to above 20 feet below surface grade in the immediate vicinity of the former tank pit, and that the groundwater is impacted with low levels of volatile organic compounds and methyl tertiary butyl ether. In correspondence dated March 9, 2001 PHS/EHD directed that a minimum of three groundwater monitoring wells be installed to begin the investigation of the vertical and lateral extent of the groundwater contamination, and that a well survey be completed. At the meeting the responsible party requested to install only one monitoring well at this time. Financial issues and the existence of monitoring wells on a neighboring property were cited as support for the request. Information from the wells on the neighboring property can be used initially to infer groundwater flow direction on the subject site. Both the CVRWQCB and PHS/EHD agreed that if the responsible party chooses to continue the investigation in a phased approach that would be acceptable, but stressed that if contamination is discovered and confirmed in the one monitoring well, another mobilization would be required to install additional monitoring wells to fully define the extent of the contaminant plume. The responsible party agreed to this condition. A Division of San Joaquin County Health Care Services