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12 November 1999 <br /> • AGE-NC Project No 95-0173 <br /> Page 5 of 5 <br /> • The elevated petroleum hydrocarbon concentrations detected in water samples collected from <br /> I wells MW-1, MW-2, MW-3, MW-4 (screened between 30 and 50 feet bsg) and VW-1 <br /> (screened between 15 and 35 feet bsg) suggest that these wells may be screened within or <br /> near the dissolved petroleum hydrocarbon"core area"of the plume <br /> • The significant decrease in quantified dissolved petroleum hydrocarbons detected from wells <br /> MW-1 (screened 30 to 50 feet bsg) and MW-6 (screened 25 to 45 feet) may be related to an <br /> eastward shift in the dissolved petroleum hydrocarbon plume <br /> • The dissolved petroleum hydrocarbon plume appears to be sufficiently contained within the <br />' current array of ground water monitoring wells <br /> I5.0. RECOMMENDATIONS <br />' Based upon the results of this investigation, AGE recommends <br /> • Installation of the PHS-EHD-approved (by letter dated 20 April 1999) soil vapor extraction <br />' • and in-situ air sparging system at the site <br /> • Reduction of quarterly monitoring/sampling events to semi-annual monitoring/sampling <br /> Ievents until initiation of a remediation system at the site <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 mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation are made from a limited number <br /> of available data points (e g 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 /> 1 <br />' Advanced GeoEmiron mental,Inc <br /> 1 <br />