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i <br /> Mr H Knoll <br /> June 23, 1999 <br /> • Page 3 <br /> t <br /> detected in the shallower groundwater sample obtained from Boring BFS-2 sampled <br /> between 20 and 22 feet bgs <br /> In conclusion, QST believes that the petroleum hydrocarbons detected in the soil are <br /> limited to beneath the closed in placed USTs which are located beneath the sidewalk <br /> and petroleum hydrocarbons are not in the soil on the former BFS property The <br /> MTBE and other oxygenates detected in the groundwater sample are not from the BFS <br /> USTs, because these compounds were not added to gasoline prior to abandonment of <br /> the tanks To further support this conclusion, QST obtained additional environmental <br /> information regarding sites in the vicinity of the BFS site <br /> ADDITIONAL ENVIRONMENTAL INFORMATION <br /> In May 1999, QST requested a database search from Vista Information Solutions for all <br /> UST sites in the vicinity of the former BFS facility The database search identified <br /> several potential MTBE sources Based on the database review results, QST reviewed <br /> the SJCPHS-EHD files on the sites identified The following is a summary <br /> Canepa's Car Wash <br /> + Located approximately 0 16 miles north of the former BFS facility <br /> o MTBE has previously been detected in groundwater <br /> o MTBE and other oxygenates have not been detected in recent quarterly monitoring, <br /> however, well screen intervals for all wells are below the current water table. <br /> 0 Groundwater flow is to the north-northeast <br /> Chase Chevrole <br /> + Located approximately 0 17 miles west of the former BFS facility. <br /> + MTBE has previously been detected in groundwater <br /> + Groundwater flow is to the north-northeast <br /> Arco <br /> + Located approximately 0 11 miles southwest of the former BFS facility <br /> + In a letter to Arco from SJCPHS-EHD dated January 21, 1997, SJCPHS-EHD <br /> indicated that Arco may have had a release of gasoline that affected the soil and <br /> groundwater offsite at 141 North El Dorado <br /> + Arco is upgradient to the former BFS facility <br /> + Depth to groundwater is approximately 14 feet bgs and flow is to the northeast. <br /> + MTBE has been detected in groundwater samples collected from Arco momtonng <br /> wells <br /> Weber Enteipnse (141 North El Dorado) <br /> Located approximately 0 13 miles south of the former BFS facility <br />