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385 Grant Line, Tracy <br /> Page 2 <br /> MTBE.was detected in the soil samples from MW1 and MW2 using EPA Method # <br /> 8260A. Water samples collected from all three monitoring wells in June 2000 <br /> evidenced MTBE contamination. <br /> Groundwater samples were collected from the three monitoring wells in October <br /> 2000. The analytical results of those samples indicate much lower <br /> concentrations of MTBE in the groundwater than did the June 2000 results. <br /> Table 2 in the December 7, 2000 report shows the results of MW2 and MW3 <br /> water samples in reverse of what the laboratory data sheets show. Please <br /> correct this information. <br /> PHSIEHD requested a work plan to determine the lateral and vertical extent of <br /> the contamination at this site. URS has proposed installation of two additional <br /> monitoring wells north and northeast of MW1 to investigate the lateral extent of <br /> the contamination. PHSIEHD requires that the vertical extent of the <br /> contamination be investigated'as well. At least one boring/monitoring well must <br /> be installed downgradient of the former UST location and the investigation must <br /> continue below the 25 feet depth of confirmed soil contamination. A discretely <br /> screened well to define the vertical extent of the contamination should be <br /> installed. , <br /> A work plan to investigate the lateral and vertical extent of contamination in soil <br /> and groundwater should be submitted to PHSIEHD by April 1, 2001. <br /> if you have any questions contact me at (209) 468-3449. <br /> Donna Heran, REHS <br /> Director of Environmental Health r <br /> Margaret agorio, Supervising REHS <br /> Unit IV/LOP <br /> C: CVRWQCB — Marty Hartzell <br /> URS — Philip Cox <br /> Albert & C Navarra <br /> i <br />