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i Y , <br /> Jay's Mini Mart <br /> Page 2 of 2 <br /> flow direction to be variable with a tendency to flow toward the north/northeast and <br /> southeast. However, soil samples have not been collected north of the former/current <br /> underground storage tank (UST) area where high concentrations of diesel [22,000 <br /> milligrams per kilograms (mg/kg)] were detected during the UST removals in 1997. <br /> Please submit a work plan addendum to EHD by March 17, 2006, that will address these <br /> concerns. Include the technical justification for each proposed soil boring in the <br /> addendum. <br /> EHD does not believe it is necessary to analyze soil andgrab groundwater samples from <br /> the'proposed borings for ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether <br /> (TAME), and di-isopropyl ether(DIPE) since these compounds have not been detected in <br /> any soil or groundwater samples. However, please add 1,2;-DCA and TPH-diesel (TPH-d) <br /> to the analyte list since these compounds have been detected at this site. <br /> Chemicals of concern have not been detected in groundwater samples collected from <br /> monitoring wells MW-1, MW-2, and MW-3 during any of the sampling events reported <br /> to date. Therefore, EHD will approve removal of TPH-d,] ETBE, TAME, DIPE, tertiary <br /> butyl alcohol (TBA), 1,2-DCA, and 1,2-dibr6moethane (EDB) from the analytical list of <br /> compounds if proposed by your consultant. Continue collecting depth-to-water <br /> measurements in all wells during each groundwater monitoring event for the purpose of <br /> determining the groundwater gradient. Please continue to monitor the groundwater <br /> semiannually and submit the reports to EHD within ninety'days of each sampling event. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-3456 or by <br /> electronic mail at vmccartney@sjcehd.com. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> G� ���% <br /> Victoria L. McCartney, Senior REHS Nuel C. Henderson, Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: Todd Hafner, PG - ATC <br /> James L.L. Barton, PG - CVRWQCB <br /> I I <br />