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13 July 1999 <br /> AGE-NC Project No 95-0142 <br />` Page 4 of 4 <br /> f <br /> • Significant concentrations of TPH-g and benzene were detected in the samples from the <br /> deeply screened monitoring well MW-6 (screened 70 to 80 feet bsg), approximately 45 feet <br /> below ground water <br /> 5.0. RECOMMENDATIONS <br /> Based upon the data collected to date, AGE recommends <br /> • Continued quarterly monitoring, the next quarterly ground water sampling and monitoring <br /> Ievent should be scheduled for October 1999 <br /> • Installation of two additional deep aquifer zone ground water monitoring wells, with depth- <br /> discrete well screens <br /> • Installation of additional soil vapor extraction and/or in-situ air sparging wells needed for <br /> active remediation at the site, as referred to in the PHS-EHD approved Corrective Action <br /> Plan <br /> • 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing ;n 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 data <br /> points (i e monitoring-well ground water samples) and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br /> I <br /> I <br /> 1 <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />