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y <br /> %✓ <br /> San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street <br /> Laurie Colulla,REHS <br /> V): <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Mike Huggins,REHS,RDI <br /> • �;•, A Margaret Lagorio,REHS <br /> R o�o. �i� Website: wwW 5jgov.orgdehd Robert McClellon,REHS <br /> Phone: (209)458-3420 ,teff Carruesce,REHS,RDI <br /> Fax: (209)464-0138 Kasey Foley,REHS <br /> March 2, 2009 <br /> Joe Toste Jr. <br /> Toste Farms Inc. <br /> 2480 Toste Road <br /> Tracy, CA 95376 <br /> Subject: Tracy Marine Sales <br /> 2353 Toste Road <br /> Tracy, CA <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed our file and the <br /> "Quarterly Report — Fourth Quarter 2008" (Report) dated January 20, 2009, prepared by <br /> Advanced Geo Environmental, Inc. (AGE) for the above subject site and provides the following <br /> comments. <br /> In a letter dated January 7, 2009, the EHD directed that the ozone system be assessed and that <br /> ozone injection be limited to the shallow injection points near MW7. This was to be completed <br /> by January 27, 2009 and the EHD was to be informed of the details of the adjustments to the <br /> ozone system_ To date the EHD has not been informed that adjustments have been made to <br /> the ozone system. <br /> The Report discusses that groundwater samples were only collected from monitoring wells MW- <br /> 4, MW-5, MW-7 and MW-8. Although, the EHD approves of this reduction in sampling of wells, <br /> changes in the wells to be sampled or chemical analysis on the samples is to be proposed and <br /> approved by the EHD prior to the action. Monitoring wells MW-1, MW-2, MW-3, MW-6 and MW- <br /> 9 through MW-11 are to be sampled annually. To further reduce sampling and corrective <br /> action costs the EHD recommends that MW-4, MW5 and MW8 only be sampled twice a year, <br /> during the first and third quarters, that chemical analysis on the water samples be limited to total <br /> petroleum hydrocarbons as gasoline (TPH-g) and MTBE and that measurements for dissolved <br /> oxygen be limited to those wells within the area of ozone operation. <br /> The concentrations of MTBE and TPH-g in the water samples from MW-7 (currently the only <br /> well with contaminant concentrations) were significantly reduced the fourth quarter 2008. It is <br /> essential that quarterly sampling of this well continue. Once the concentrations of MTBE and <br /> TPH-g are confirmed to be reduced to this low level, then the ozone injection can be <br /> discontinued and post remedial monitoring (sampling to confirm the MTBE and TPH-g has been <br /> remediated) can be conducted. <br />