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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION �. . <br /> Karen Furst, M.D., M.P.H., Health Officer • cq.- �P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> APR 0 9 2001 <br /> ROBERT COCHRAN <br /> CHEVRON PRODUCTS COMPANY <br /> P O BOX 6004 _ <br /> SAN RAMON CA 94583-0904 <br /> RE: Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD)has <br /> reviewed the "Site Assessment'(report)prepared by Secor International Incorporated, dated <br /> March 21, 2001. The report describes the eleven-year investigative history at the site located at <br /> 139 South Center Street in Stockton,California(site). The report explains in detail the most <br /> recent investigation at the site, including the advancement of four direct push borings by cone <br /> penetrometer testing(CPT)and four additional borings immediately adjacent to the CPT borings <br /> for the purpose of collecting discrete groundwater samples. The groundwater samples were taken <br /> to further evaluate the lateral and vertical extent of hydrocarbons, including methyl tertiary butyl <br /> ether(MtBE) in groundwater. <br /> The report concludes with the statement that, "data collected in this investigation suggests (sic] <br /> that the contaminant plume has been defined to low to non-detect levels." Although the extent of <br /> contamination has not been completely defined at the site, PHS/EHD concurs that after eleven <br /> years, sufficient data have been collected to proceed to the next step. Therefore, PHS/EHD <br /> directs you to prepare a corrective action plan and submit it to PHS/EHD by June 4, 2001, which <br /> is approximately 60 calendar days from the date of this notice. <br /> The previous caseworker for this site,Ron Rowe, is no longer with San Joaquin County. This site <br /> will be assigned to a new caseworker in the near future. In the meantime,you may address your <br /> reports to Dot Lofstrom and you may call her with any questions related to the site at(209)468- <br /> 3436. <br /> Donna Heran, REHS,Director <br /> Environmental Health Division <br /> Dot Lofstrom, R.G. <br /> LOP/Site Mitigation <br /> cc: Marty Hartzell —CVWRQCB <br /> Roger Hoffmore-Secor <br /> i, APR 1 0 <br /> A Division of San Joaquin County Health Care Services <br /> _ x <br />