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' 31 January 2002 <br /> AGE-NC Project No 95-0128 <br />' Page 8 of 8 <br />' Factors conte olling effectiveness of ground water extraction are soil hydrogeologlc properties, <br /> dissolved hydrocarbon mass distribution, and adsorption affinity of the hydrocarbons to the soil <br /> matrix The soil at the site has a high percentage of fine-grained matrix and overall is homogenous <br />' and mostly fine-grained, fostering a high adsorption capacity for the soil and low permeability limiting <br /> migration of dissolved hydrocarbons Despite the fine-grained nature of the soil, the feasibility,test <br /> showed that ground watei extraction should be effective on the site Ground water extraction rates <br />' are not likely to exceed the pilot test rate, and may be less for effective ground water extraction and <br /> stabilized drawdown AGE recommends preparation of a remedial action work plan for the <br /> Installation of additional ground water extraction wells surrounding the former UST area to mci ease <br />' the effectiveness of ground water extraction to address the dissolved hydrocarbons and operation of <br /> a ground water extraction ti eatment system <br />' This technology should be conducted in conjunction with soil vapor extraction to maximize the <br /> thickness of the vadose zone, for effective soil vapor extraction <br /> 6.0 LIMITATIONS <br />' Our professional services were performed using that degi ee of care and skill ordinarily exercised by <br /> envii onmental consultants practicing in this or similar localities The findings were based mainly upon <br />' analytical results provided by an independent laboratory Evaluation of the geologic/hydro-geologic <br /> conditions at the site for the purpose of this ihvestigation were made from a linruted number of <br /> available data points (Solinst Levelogger data, ground water data, ground water samples), and <br />' subsui face conditions may vary away fiom these data points No other warranty, expressed of <br /> implied, is made as to the professional recommendations contained in this report <br /> 1 <br /> ' Advanced GeoEnvironmentai Inc <br />