Laserfiche WebLink
04 October 2005 <br /> • AGE-NC Project No 98-0432 <br /> Page 6 of 6 <br /> hydrocarbons have not been detected in well MW-6 Monitoring well MW-7 has remained <br /> uncontammatecV,<Nith the exception of a detection of MTBE during the initial ground water <br /> sampling in December 2002 after well installation <br /> • No petroleum hydrocarbon constituents were detected in any of the ground water monitoring <br /> wells during the last four monitoring events,conducted from October 2004 to July 2005,with <br /> the exception of low detections of TPH-g, ethylbenzene, and xylenes in well MW-8 in <br /> April 2005 <br /> • Ground water monitoring wells MW-1 and MW-2 have historically been the most impacted <br /> at the site, laboratory analysis has reported TPH-g,TPH-d,and MTBE as high as 1,600 µg/1, <br /> 590 µg/1, and 31,000 pg/l, respectively TBA was detected in well MW-1 in May 2000 at a <br /> concentration of 1,500 µg11,ethylbenzene and xylenes were detected in well MW-8 in April <br /> 2005 at concentrations off? µg/1 and 3 4g/l, respectively <br /> 2,07 �/sr 51 i 10,, <br /> • The concentrations of petroleum hydrocarbon contaminants in wells MW-1 through MW-8 <br /> have declined below detection limits between the initiation of ground water monitoring in <br /> January 2000 and the present <br /> 7.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br /> • Low-risk site closure as defined in Section 6 5 of Appendix A of the Tri-Regional <br /> Recommendations 1) The contaminant plume is stable and limited to the immediate area of <br /> the former USTs,2)There are no current or anticipated uses of the impaired water at the site <br /> • Destroy monitoring wells in accordance with applicable regulations as part of the site closure <br /> preparations <br /> 8.0. LIAUTATIONS <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 /> 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 /> • r <br /> Advanced GeoEnvironmentai,Inc <br />