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PUBLIC HEALTH SERVICES SERVI CFQ . EY <br /> S OP�UIN' C <br /> SAN JOAQUIN COUNTY <br /> Z <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M.D., M.P.H., Health Officer � <br /> 304 East Weber Avenue, Third Floor Stockton, CA 95202 9ciFORN <br /> 209/468-3420 <br /> D <br /> JAY MCILRATH EC 0 5 2000 <br /> J C & M MCILRATH <br /> P O BOX 326 <br /> STOCKTON CA 95201 <br /> Re: JAMAR Service Site Code: 1667 <br /> 4075 E. Main St. <br /> Stockton, CA 95212 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the 2"d Phase II Report (report) dated October 25, 2000 prepared by John P. Cummings <br /> &Associates for the above referenced site. The report is not complete according to specifications <br /> set forth in Appendix A, Tri-Regional Board Staff Recommendations for Preliminary <br /> Investigation and Evaluation of Underground Tank Sites (Appendix A). Additional information <br /> will be necessary to complete the report. Soil and groundwater samples collected at this site <br /> evidence continued and increasing petroleum contaminant concentrations. Further investigation <br /> of soil and groundwater at this site is necessary, remediation alternatives for soil and <br /> groundwater clean up must be evaluated, and measures must be taken to contain and reduce <br /> groundwater contamination. <br /> In addition to petroleum contaminants in the groundwater, the report evidences significant soil <br /> contamination from approximately 25 feet to 75 feet below surface grade in the source area. <br /> Reduction of contaminant concentrations in soil at the site is necessary to reduce and prevent <br /> further contamination of the groundwater. Soil vapor extraction remediation techniques have <br /> been used successfully in San Joaquin County to remediate petroleum-contaminated soils. At <br /> least one soil vapor extraction well must be installed at this site so that feasibility studies can be <br /> conducted and vapor extraction can be evaluated as a remediation method. <br /> An air sparge well should also be installed at the site to evaluate the effectiveness of air sparging <br /> for groundwater remediation. Additional air sparge wells may be needed in the future. A pump <br /> and treat method for the methyl tertiary butyl ether(MTBE)-contaminated groundwater at this <br /> site must be proposed as well. The groundwater at this site has MTBE concentrations as high as <br /> 250,000 parts per billion and the risk to environmental and public health is potentially <br /> significant. MTBE is a highly mobile contaminant and nearby well pumping could enhance the <br /> speed of MTBE off site migration. A pump and treat plan, feasibility study, and cost-effective <br /> comparison for different remedial alternatives at this site must be submitted to PHS/EHD. <br /> A Division of San Joaquin County Health Care Services <br />