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19 December 2005 <br /> • AGE-NC Project No 99-0645 <br /> IPage 8 of 8 <br /> • Historically, low concentrations of petroleum hydrocarbon constituents were detected <br /> sporadically in monitoring well MW-1 before its destruction in September 2002 MTBE was <br /> detected in MW-1R during its initial ground water monitoring in October 2003 at a <br />' concentration of 120 pg/l,TPH-g was detected in well MW-2 during its second ground water <br /> monitoring in April 2002 at a concentration of 130 pg/1 Monitoring well MW-3 has <br /> remained uncontaminated <br /> • The concentrations of petroleum hydrocarbon contaminants in wells MW-1, MW-1R, and <br /> MW-2 have declined below detection limits between the initiation of ground water <br /> monitoring in November 2001 or October 2003 (MW-1R) and the present <br /> t • The concentration of petroleum hydrocarbons in soil vapor samples extracted from well <br /> VW 1 B, installed in the area of greatest adsorbed petroleum hydrocarbon contamination,has <br /> I declined below laboratory detection limits between initiation of SVE remediation in October <br /> 2004 and the present <br /> I <br /> 7.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br /> • Low-risk site closure as defined in Appendix A of the Tri-Regional Recommendations the <br /> potential source of ground water contamination, petroleum hydrocarbon contamination in <br /> soil,has been remediated below laboratory detection limits,the concentrations of petroleum <br /> hydrocarbon contaminants in wells MW-1, MW-1R, and MW-2 have declined below <br /> detection limits between the initiation of ground water monitoring in November 2001 or <br /> October 2003 (MW-1R) and the present <br /> • Destroy monitoring wells in accordance with applicable regulations as part of the site closure <br /> preparations <br /> 8.0. <br /> 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 mainly <br />' upon analytical results provided by an independent laboratory Evaluations of the geologic/ <br /> hydrogeologic conditions at the site for the purpose of this investigation are made from a limited <br /> number of available data points (i e grab ground water samples and soil samples) and subsurface <br /> I conditions may vary away from these data points No other warranty, expressed or implied,is made <br /> as to the professional interpretations, opinions and recommendations contained in this report <br /> IAdvanced GeoEnvironmentai,Inc <br />