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, <br /> r <br /> 23 October 1998 <br /> AGE-NC Project No 95-0184 <br />' Page 4 of 4 <br />' - Ground water Is currently within the screened interval in one vapor well and near the top of <br /> the screened interval in two additional vapor wells The data collected from these wells <br /> should be representative of shallow ground water conditions <br /> A <br />' - The lateral extent of hydrocarbon-impacted soil at the site has not been defined Soil samples <br /> collected during the installation of additional monitoring wells may be used to define the <br /> extent of impacted soil <br />' 5.0. RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends the following <br /> - A soil vapor extraction/in-situ air sparging pilot test should be conducted to evaluate <br />' remediation options for this site Findings of the vapor extraction/air sparging test can be <br /> used to determine the spacings of potential additional vapor and sparging wells We <br /> anticipate performance of the pilot test in November 1998 <br /> - Additional soil borings and monitoring wells should be installed to define the horizontal <br /> extent of hydrocarbon-impacted soil and ground water A work plan for the installation of <br /> additional monitoring wells has been approved by the PHS-EHD <br /> - The next ground water monitoring event will be scheduled for October 1998 <br /> 6.0. LIMITATIONS <br />' Our professional services were performed using that-degree of care and skull 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 were made from a limited number of <br /> available data points (I a momtonng wells), and subsurface conditions may vary away from these <br />' data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br /> Advanced GeoEnv€ronmental,Inc <br />