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PUBLIC HEALTH SERVICES <br /> OP�U�N' C <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 Stockton, CA 95 1-03$8 OR�'`P <br /> 209/468-3420 �-�\' <br /> LLV <br /> BRETT HUNTER MAILED APR 2 3 199 <br /> ENVIRONMENTAL ENGINEER <br /> CHEVRON USA PRODUCTS CO <br /> P O BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Station #9-6171 SITE CODE: 1784 <br /> 6633 Pacific Avenue <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the Gettler Ryan quarterly report dated March <br /> 18, 1996 and the Pacific Environmental "Soil Investigation Report" dated January <br /> 10, 1996. PHS/EHD has the following comments for your consideration. <br /> The soil investigation report included the results of the September 1995 <br /> investigation to evaluate additional possible sources of soil contamination in the <br /> area of the existing underground storage tanks and the former and current fuel <br /> dispenser product islands. Drilling refusal was encountered and reportedly caused <br /> by metallic objects, possibly former piping which was left in-place. Two of the five <br /> soil borings detected soil contamination. PHS/EHD agrees that the extent of soil <br /> contamination evidenced during this investigation did not conclusively demonstrate <br /> the source of the contamination which has been observed in monitoring well, <br /> MW2. <br /> Since November 5, 1995, the depth to groundwater has risen approximately two <br /> feet, as measured on February 12, 1996. PHS/EHD stated that a number of <br /> monitoring wells were screened below first water. Currently all existing monitoring <br /> wells are screened between 6 and 1 feet below first water. <br /> PHS/EHD understands that in the near future there may be a site remodelling and <br /> piping upgrade that is planned. At the time of piping upgrade, it is possible that <br /> additional information regarding the former piping may be obtained. <br /> The definition of the source of the contamination has not been determined, thus <br /> making a more focused remediation methodology impossible; therefore, PHS/EHD <br /> agrees that intrinsic bioremediation may likely be the most cost effective remedial <br /> alternative. The "Corrective Action Plan" dated April 4, 1995, included more than <br /> a conceptual site model for intrinsic bioremediation proposal and many issues <br /> A Division of San Joaquin County Health Care Services <br />