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naa <br /> �f 28 February 1997 <br /> ='=+ AGE Project No. 95-0118 <br /> } Page 3 of 3 <br /> The plume of hydrocarbon-impacted ground water is delimited on the northeast, northwest <br /> west,southwest and south,relative to the former UST pit. The plume is less well defined east <br /> of the former UST pit.. <br /> The concentrations of dissolved hydrocarbons in MW-2 and MW-3 have generally decreased <br /> since the highest concentrations most analytes were detected during the March 1995 ground <br /> 4 water monitoring event, but the concentrations have fluctuated widely since that monitoring <br /> event. <br /> 4.2. RECOMMENDATIONS <br /> Based upon the results of the investigation, AGE_recommendations the following: <br /> • The next quarterly.ground water sampling event should be conducted in Manch of 1997. <br /> • Soil and purged ground water from previous investigations should be disposed at a licenced <br /> treatment/disposal facility or treated on-site. <br /> Feasibility testing has indicated that in-situ air sparging (IAS), combined with soil vapor <br /> extraction, would be a cost-effective remediation method for this site. If remediation is <br /> > E required, we recommend the installation of an SUE/IAS system. <br /> 5.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> 1 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/hydro geologic <br /> -1 conditions at the site for the purpose of this investigation are made from a limited number of <br /> i available data points (i.e. monitoring 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 /> 1 <br />