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PUBLIC HEALTH SEYVICES <br /> SAN JOAQUIINV COUN -1Y <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> MEMORANDUM <br /> TO: Interested Parties <br /> FROM: Mary Meays, Senior REHS <br /> DATE: June 6, 1997 <br /> RE: Country Club Shell located at 2575 County Club Blvd., Stockton <br /> History <br /> On December 7, 1994, San Joaquin County, Public Health Services Environmental <br /> Health Division (PHS/EHD) was notified that gasoline was released from underground <br /> storage tanks on site. The tanks in question no longer contained gasoline products. <br /> It was estimated that approximately 8,500 gallons of gasoline was discharged into the <br /> environment. Shell immediately responded with the installation of a monitoring well, <br /> MW 1 and a recovery well, RW 1, on December 10, 1994 and began floating gasoline <br /> product removal. On December 13, 1994, an additional recovery well was installed <br /> and vapor extraction was initiated which continued until May 1, 1995. <br /> On December 18, 1994, four additional monitoring wells, MW2 - MW5, were installed. <br /> Monitoring well, MW4 was installed on St. Bernadette's Catholic Church property. <br /> To expedite site characterization, 14 probes were advanced into groundwater on <br /> December 28, 1994 and groundwater samples collected. <br /> On May 1, 1995, two wells, MW 1 and RW 1, near the leaking tanks were destroyed <br /> prior to the removal of the four underground storage tanks on May 2, 1995. Once the <br /> tanks were removed an excavation occurred that removed approximately 1,044 cubic <br /> yards of contaminated soil. The former product piping was removed and the product <br /> trench lines were overexcavated removing an additional 366 cubic yards of <br /> contaminated soil. On May 11, 1995, two 15,000 gallon underground storage tanks <br /> were installed and the station began operating once the other construction activities <br /> were completed. On May 25, 1995, a replacement recovery well, RW IA was installed. <br /> In January 1997 three additional monitoring wells were installed, MW6 - MW8 and an <br /> exploratory soil boring was drilled and sampled to continue investigating the vertical <br /> extent of the contamination. PHS/EHD directed Shell to,complete the investigation <br /> and to sample nearby domestic wells to verify that the wells have not been impacted <br /> by the gasoline contamination. <br /> Quarterly sampling of the monitoring wells has occurred and will continue until <br /> cleanup is complete. <br /> Future Activities <br /> Shell Oil will place an additional well southwest of the site on Caltrans'property to <br /> further define the extent of groundwater contamination.ation. PHS/EHD has also directed <br /> Shell Oil to define the vertical depth of the contamination so that the full extent of the <br /> contamination is determined. Once the investigation is complete, a corrective action <br /> plan will be prepared and available for public comment. It is anticipated that the <br /> corrective action plan will be available by October 1997. <br /> If you have any questions or comments, please contact Mary Meays with PHS/EHD at <br /> (209) 468-0337. <br /> A Division of San Joaquin County Health Cate Set es <br />