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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY =' x <br /> W x :i <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> . D <br /> PAUL SUPPLE V <br /> ARCO PRODUCTS COMPANY <br /> PO BOX 6549 NOV 01999 <br /> MORAGA CA 94570 <br /> RE: ARCO SERVICE STATION 42186 Site Code: 1035 <br /> 3212 CALIFORNIA ST <br /> STOCKTON CA 95204 <br /> 1 <br /> San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) has <br /> reviewed the Additional Assessment of Hydrocarbon-Impacted Soil and Groundwater Report <br /> dated October 19, 1999 prepared by IT Group for the above referenced site. Water and soil <br /> samples collected from Cone Penetrometry Test(CPT) investigative borings evidenced petroleum <br /> contamination. Groundwater samples collected from CPT#2 evidenced Methyl tertiary-butyl <br /> ether(MTBE) at 199 parts per billion(ppb) in soil and 412 ppb in groundwater. Data from CPT <br /> 92 indicates that MTBE contaminated groundwater is migrating off site. The off site migration of <br /> petroleum contaminants should be further evaluated and mitigated: <br /> PHS/EHD also reviewed the Quarterly Monitoring Report(QMR) dated September 9, 1999 for <br /> the above referenced site. Groundwater sampling data does not reflect decreasing or stabilized <br /> petroleum contaminant concentrations at this-site. Continue quarterly monitoring of all MWs <br /> ' until otherwise directed by PHS/EHD. <br /> Feasibility tests should be conducted in order to compare at least two different remediation <br /> alternatives for this site. A Work Plan to evaluate off site migration and to propose remediation <br /> alternative studies for the contamination at this site should be submitted to PHS/EHD by January <br /> 25, 2000. Contact Carol Oz, Senior REHS at(209)468-3440 if you have questions regarding this <br /> letter. <br /> Donna Heran, REHS, Director <br /> Environmental Health .Division <br /> Carol Oz, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit IV Supervisor <br /> cc: Mark List-CVRWQCB <br /> Joel Coffman-IT Group <br /> A Division of San Joaquin County Health Care Services <br />