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19 July 2000 <br /> AGE-NC Project No 96-0232 <br /> Page 24 of 29 <br /> - Dissolved MTBE was detected from three samples in P16 at concentrations as high as 280 <br /> µg/1, ethanol detected at concentrations as high as 8 6 µg/1 and TBA was detected at <br /> concentrations as high as 6 µg/1 at depths between 37 feet and 90 feet bsg, in the Second <br /> Zone, Rocky's Upper Zone, and Secondary Aquifer Zone <br /> - Dissolved MTBE was detected in samples from P17 at concentrations as high as 150µg/l, <br /> ethanol as high as 27µg/1 and TBA as high as 7 1 4g11 at depths between 37 feet and 114 feet <br /> bsg, in the Second Zone, Secondary Aquifer Zone, and Pnmary Aquifer Zone <br /> Horizontal migration of dissolved MTBE and TBA from the Flag City Chevron site to at <br /> least the area of P 17, vertical migration of MTBE and TBA in this area has apparently been <br /> facilitated by the design and construction of the domestic water well <br /> The findings from the May 2000 Geoprobe soil boring investigation are as follows <br /> Shallow ground water at depths between 15 and 20 feet bsg at the Flag City Chevron site has <br /> been impacted by TPH-d and MTBE, a lesser degree of TPH-g and BTEX were encountered <br /> in shallow ground water <br /> - The highest concentration of MTBE in shallow ground water was detected in the sample <br /> collected near the southwest fuel dispenser(P32) at the site The highest concentrations of <br /> MTBE in soil samples were detected in the 10-foot soil samples collected near the southwest <br /> portion of the storm drain system (P22) and the southeast fuel dispenser (P31) Lesser <br /> concentrations of MTBE were detected at the site in soil and shallow ground water samples <br /> collected from P 19, P20, P23, P24, P25, P26, P30 and P34 <br /> The highest concentration of TPH-g in shallow ground water was detected in the sample <br /> from soil boring P30 near the middle-west fuel dispenser at the site, TPH-g was detected In <br /> the 10 foot soil sample collected at P31 in the area of the southeast fuel dispenser Low to <br /> moderate concentrations of TPH-g were detected in shallow ground water samples collected <br /> from P22, P24, P31 and P34 <br /> - The highest concentration of TPH-d in shallow ground water was detected in the sample <br /> collected from soil bonng P30 near the middle-west fuel dispenser island at the site, TPH-d <br /> was detected in the 10-foot soil sample collected at P31 in the area of the southeast fuel <br /> dispenser Low to moderate concentrations of dissolved TPH-d were detected in samples <br /> from P18, P19, P20, P23, P24, P25, P27, P28, P31, P32, P34 and P35- <br /> TPH-9 and TPH-d were detected in a soil sample collected at SS-1 (sidewall below the water <br /> valve box) near the southeast fuel dispenser island at concentrations as high as 250 mg/kg <br /> and 2,400 mg/kg, respectively <br /> - The Geoprobe investigation results suggest that the dispenser area and possibly the southwest <br /> Advanced GeoEmironmcntal,Inc <br />