SITE INFORMATION AND CORRESPONDENCE

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�./ *Vol San Joaquin County DIRECTOR Donna Heran, REHS Environmental Health Department � '��:.•0 ASSISTANT DIRECTOR GLaurie Cotulla,REHS z "� 2 600 East Main Street 3029 Stockton, California 95202- PROGRAM COORDINATORS Mike Huggins,REHS,RDI Margaret Lagorio, REHS Cq•. ��P Website: www.sjgov.org/ehd Robert McClellon,REHS �lFpR Phone: (209)468-3420 ,left Carruesco,REHS,RD] Fax: (209) 464-0138 Kasey Foley,REHS March 2, 2009 Joe Toste Jr. Taste Farms Inc. 2480 Toste Road Tracy, CA 95376 Subject: Tracy Marine Sales 2353 Toste Road Tracy, CA The San Joaquin County Environmental Health Department (EHD) has reviewed our file and the "Quarterly Report — Fourth Quarter 2008" (Report) dated January 20, 2009, prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above subject site and provides the following comments. In a letter dated January 7, 2009, the EHD directed that the ozone system be assessed and that ozone injection be limited to the shallow injection points near MW7. This was to be completed by January 27, 2009 and the EHD was to be informed of the details of the adjustments to the ozone system. To date the EHD has not been informed that adjustments have been made to the ozone system. The Report discusses that groundwater samples were only collected from monitoring wells MW- 4, MW-5, MW-7 and MW-8. Although, the EHD approves of this reduction in sampling of wells, changes in the wells to be sampled or chemical analysis on the samples is to be proposed and approved by the EHD prior to the action. Monitoring wells MW-1, MW-2, MW-3, MW-6 and MW- 9 through MW-11 are to be sampled annually. To further reduce sampling and corrective action costs the EHD recommends that MW-4, MW5 and MW8 only be sampled twice a year, during the first and third quarters, that chemical analysis on the water samples be limited to total petroleum hydrocarbons as gasoline (TPH-g) and MTBE and that measurements for dissolved oxygen be limited to those wells within the area of ozone operation. The concentrations of MTBE and TPH-g in the water Samples from MW-7 (currently the only well with contaminant concentrations) were significantly reduced the fourth quarter 2008. It is essential that quarterly sampling of this well continue. Once the concentrations of MTBE and TPH-g are confirmed to be reduced to this low level, then the ozone injection can be discontinued and post remedial monitoring (sampling to confirm the MTBE and TPH-g has been remediated) can be conducted.