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PUBLIC HEALTH SERVICES , N <br /> P <br /> SAN JOAQUIN COUNTY <br /> r. <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 /> C 0 ` V <br /> STEVE JERKINS <br /> SUPERINTENDENT OF ENGINEERING <br /> CRYSTAL CREAMERY AND BUTTER COMPANY JUL3 1997 <br /> PO BOX 1313 <br /> SACRAMENTO CA 95086 <br /> RE : Crystal Creamery and Butter Company SITE CODE : 2098 <br /> 404 W Fremont St. <br /> Stockton CA 95086 <br /> San Joaquin County Public Health Services , Environmental Health Division <br /> ( PHS/EHD) has reviewed the April 30 , 1997 " Quarterly Status Report" prepared <br /> by your consultant, Wallace Kuhl and Associates , for the above referenced site . <br /> PHS/EHD has concluded , based on available information , that the downward <br /> trend of petroleum hydrocarbon concentrations observed in MW- 1 suggest that <br /> the plume is migrating away from this area and that the leachable portion of the <br /> soil contamination in the former UST location has been exhausted . The <br /> concentration of petroleum hydrocarbons in MW-4 also appear to be declining <br /> after having reached maximum concentrations in 1996 . The concentration of <br /> petroleum hydrocarbons in MW-5 however have increased dramatically from 2 . 3 <br /> ppb benzene in 1994 to the current concentration of 4600 ppb benzene . <br /> The plume is migrating off site at a rate of 16 feet per year. The proposed MW-7 <br /> (WKA Workplan August 2 , 1995) will be useful in tracking off site plume migration <br /> once it has been installed . <br /> Your currently approved workplan is designed to gather data on residual soil <br /> contamination in the former UST location and to install a pilot system to gather <br /> data on the feasibility of using vapor extraction/air sparging technology at this <br /> site . The downward trend of petroleum hydrocarbon concentrations in MW- 1 <br /> ( located downgradient of the former UST) from free product concentrations to . 59 <br /> ppb benzene indicate residual soil hydrocarbons in the former UST location are <br /> no longer a secondary source contributing to groundwater degradation beneath <br /> the site . PHS/EHD recommends the task to gather data on residual soil <br /> contamination be eliminated from the current workplan . <br /> A Division o[ San Joaquin County Health Care Services <br />