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�r <br /> ' 07 December 1998 <br /> • AGE-NC Project No 95-0105 <br /> ' Page 4 of 5 <br /> ' 4.0. CONCLUSIONS <br /> Based on data collected from the site AGE concludes <br /> r - The ground water flow direction on the subject site is generally toward the northwest A <br /> depression of the ground water table in the area of well MW-4 may be due to a lag of ground <br /> ' water elevation response caused by lower permeability of the shallow fine-grained soil <br /> screened in MW-4 The average ground water elevation decreased 0 33 feet over the quarter <br /> ' - During the quarter, monitoring well MW4 had the highest concentration of TPH-g detected <br /> at 10,000 ppb Benzene was also detected at the highest concentration on the site at 270 ppb <br /> in well MW-4 <br /> - None of the analytes of interest were detected in wells MW-1, MW-2, MW-5 or MW-6, the <br /> up-gradient, down-gradient and cross-gradient wells <br /> ' - Lack of detectable concentrations of petroleum hydrocarbons in ground water samples <br /> collected from MW-6 shows that petroleum hydrocarbons have not migrated to that point <br /> north of and down-gradient of the subject property <br /> I 'I• <br /> ' S.O. RECOMMENDATIONS <br /> Based on present site conditions, AGE recommends <br /> ' - Purged ground water from previous Investigations should be disposed at a licenced <br /> treatment/disposal facility <br /> ' - Approval of the Closure Summary Report previously submitted to the PHS-EHD should be <br /> considered for the site due to the apparently limited extent of hydrocarbon-impacted soil and <br /> ground water and the loss of monitoring wells MW-4 and MW-5 It is not practical to <br /> ' monitor or otherwise address the remnant hydrocarbon-impacted soil and ground water <br /> currently confined to an area under Grant Line Road <br /> 1 � <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 independent laboratory Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of <br /> Advanced GcoEnvironmental,Inc <br /> i <br /> r <br />