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19 July 2000 <br /> AGE-NC Project No 96-0232 <br /> Page 25 of 29 <br /> • corner of the UST pat and the storm water drain lane area are the source area(s) for MTBE, <br /> TPH-d and TPH-g impacts <br /> The results of ground water extraction from EW-1 during April, May and June 2000 are as follows <br /> • Approximately 141,875 gallons of MTBE-impacted ground water were extracted from <br /> EW-1 <br /> • Initial concentrations of dissolved MTBE were detected from EW-1 on 03 April 2000 at a <br /> concentration of 1,800 µg/1 <br /> • During April 2000, MTBE was detected an four grab ground water samples collected from <br /> EW-1 at an average 1,550 1�cg/1 <br /> • During May 2000, MTBE was detected in three grab ground water samples collected from <br /> EW-1 at an average 647 ,ug/l <br /> • During June 2000, MTBE was detected in five grab ground water samples collected from <br /> EW-1 at an average 240 ,ug/l <br /> 0 • The steadily decreasing concentrations of MTBE quantified in ground water samples <br /> collected from EW-1 may indicate initial plume control and plume mass reduction in the area <br /> 0 of EW-1 <br /> The results from monthly ground water monitoring and sampling events performed an April, May <br /> and June 2000 are as follows <br /> • Ground water levels at the Flag City Chevron site fluctuated between 9 and 12 feet bsg <br /> • Ground water flow direction at the site appeared to be oriented generally between northeast <br /> and northwest at a general gradient between 0 002 and 0 003, due to the low gradient at the <br /> site, slight variations in ground water measurements or changes of recharge/discharge of the <br /> local ground water could greatly modify ground water flow direction <br /> • The greatest concentrations of on-sate dissolved MTBE were detected in MW-1 at <br /> concentrations as high as 5,700 ,ug/l, lesser concentrations of MTBE were detected on-site <br /> from MW-2 and MW-4 at concentrations as high as 30/.cg/l and from MW-9A (screened 40 <br /> to 50 feet bsg) at concentrations as high as 180 ,ug/l <br /> • The greatest concentrations of off-site dissolved MTBE were detected an MW-11 A(screened <br /> 40 to 50 feet bsg) and MW-11B (screened 65 to 75 feet bsg) at concentrations as high as 810 <br /> kcg/1 and from MW-13A (screened 10 to 20 feet bsg) at concentrations as high as 2,500µg11, <br /> lesser concentrations of MTBE were detected off-site from MW-6B (screened 43 to 48 feet <br /> Adianced CeOEnUronmental,Inc <br />