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29 June 2001 <br /> AGE-NC Project No. 98"-0468 <br /> ' Page 4 of 4 <br /> 4.0. SUMMARY/CONCLUSIONS <br /> The following summary points and'conclusions were drawn'from the results of the site investigation: <br /> • During this monitoring event, the depth to ground water in the sampled, shallow wells was <br /> within the well screen intervals. Ground water elevation in the monitoring wells decreased <br /> ' an average of 0.8 feet since the previous monitoring event. <br /> • Based on ground water elevation data,-ground water flow direction is inferred to be toward <br /> the northeast. Groundwater gradient for June 2000 was calculated to be 0.01. <br /> ' ted from MW-4 and MW-6 b EPA <br /> • MTBE was detected m the ground water samples.collet y <br /> Method 8260. The down-gradient extent of MTBE-impacted,ground water has been <br /> ' delineated to the DHS-established maximum contaminant level (MCL) of S µgll for MTBE <br /> in ground water. <br /> 5.0.. RECOMMENDATIONS <br /> Based upon data collected at the site; AGE recommends the final quarterly ground water monitoring <br /> of all well on the site to be conducted in early September 2001. <br /> 1 <br /> 6.0. LINIITATIONS <br /> AGE's professional services were performed using that degree of care and skill ordinarily exercised <br /> by environmental consultants practicing in this or similar localities. The findings were based upon <br /> ' analytical results provided by an independent laboratory. Evaluations of the geologic/hydrogeologic <br /> conditions at-the site for the purpose of this investigation were made from 'a limited number of <br /> ' available data points (i.e., monitoring well ground water samples) and subsurface conditions may <br /> vary beyond these data, points. No other warranty, expressed or implied, is, made as to the <br /> professional recommendations contained in this report. <br /> ' JUN 2 9 2001 . <br /> ENVIRONMENT HEALTH <br /> ' PERIMIT/SERVICES <br /> Advanced GeoEnvironmental,Inc. <br />