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- r <br /> ' 29 April"1998 <br /> AGE-NC Project No 96-0235 <br />' Page 3 of 3 _ r <br /> r <br /> samples collected from MW-2,which has ground water approximately 22 feet above the top <br />' of the screened interval Petroleum hydrocarbons were not detected in MW-4 or MW-5 r <br /> `• Ground water was approximately 12 to 22,feet above the screened intervals in monitoring- <br /> wells MW-1, MW-2 and MW-3, and the resulting data collected may not be representative <br /> of shallowest ground water" <br />' Ground water sampled from- MW-1 and MW-2 may not be in direct hydraulic <br /> communication with the ground water sampled from MW-4 and MW-5 due to completion <br /> of the former in only the lower clay-nch intervals <br />' The apparent groundwater flow direction was toward the south during the February 1998 <br /> _ monitoring event-The historical ground water flow direction has been northerly If ground <br />' water approximately 40 to 60 feet bsg is semi-confined or confined, then the varying screen <br /> intervals of monitoring wells at the site may account for some of the variation in the inferred <br /> ground water flow direction obsen ed at the site <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> • Installation of additional ground water monitoring wells to help define the lateral extent of <br /> impacted ground water toward the north and yield reliable hydrocarbon concentrations in <br />' ;rr 'shallow ground water near MW-2 under the current regime of high ground water elevation <br /> A work plan has been submitted to the PHS-EHD,for installing the wells <br /> ' Continued quarterly monitoring of the ground water monitoring wells on-site should be <br /> performed The next monitoring should be,performed in May 1998 <br /> 6.0. LIMITATIONS _ <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental-consultants practicing in this or similar localities The findings were based upon <br />' analytical results provided by an independentlaboratoryEvaluation of the hydrogeologic conditions ' <br /> at the site for the purpose of this investigatiodwas made from review of previous consultants reports <br /> and a limited number of available data points(ground water samples) and subsurface conditions may <br />' vary away from these data points No other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report r <br /> Advanced CeoEnvironmentat,Inc <br />