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1 - R <br /> 08 October 1999 <br /> AGE-NC Project No 96-0229 <br /> Page 4 of 6 - <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The following is a summary based on the findings of the July 1999 investigation <br /> • Ground water elevation at the site decreased an average 2 11 feet between the April 1999 and <br />' the July 1999 ground water momtonng events <br /> • Ground water was approximately 5 feet above the screened interval in monitoring well MW- <br /> 4, ground water was approximately 22 to 24 feet above the screen intervals at MW-1 and <br /> MW 10-B <br /> • ,TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3 and MW-6 <br />' at concentrations ranging as high as 65,000 ,ug/l <br /> • BTEX compounds were detected in ground water samples collected from wells MW-1, MW- <br /> 2, MW-3, MW-6, MW-7 and MW-1 OB at concentrations ranging as high as 5,500 µg/1 <br /> • The greatest benzene concentration was detected in the sample collected from well MW-1 <br /> (screened from 48 to 53 feet bsg) at a concentration of 4,800 µg/l <br /> a MTBE was detected in ground water samples collected from wells MW-1, MW-4, MW-7 <br /> and MW-8 at concentrations ranging as high as 370 µg/l MTBE was confirmed utilizing <br /> EPA Method 8260 from wells MW-1, MW-4, MW-6, MW-7 and MW-8 at concentrations <br /> ranging as high as 390 µg/l <br /> • The highest MTBE concentrations were encountered in the ground water samples collected <br /> from downgradient well MW-6 and the deeply drowned MW-1, but was not detected in the <br /> properly screened "clustered" well MW-2 <br />' • DIPE was detected in the ground water sample collected from well MW-1 at a concentration <br /> of i 1 µg/l <br /> I • TBA was detected in ground water samples collected from wells MW-4 at a concentration <br /> of 25 /,cg/l <br /> • From April 1999 to July 1999, a general decrease in dissolved petroleum hydrocarbon <br /> concentrations was quantified in samples collected from wells MW-2, MW-4, MW-7,MW-8 <br /> and MW-10B (Table 2) Conversely, general increases were observed in samples collected <br /> from wells MW-1 and MW-3 <br /> • Dissolved petroleum hydrocarbons have been detected during two of four groundwater <br /> monitoring events performed at downgradient well MW-1013 (screened 50 to 55 feet bsg) <br /> Based on the results of ground water monitoring and sampling activities performed in July 1999, <br /> Adranced GcoEn%ironmental,Inc <br />