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06/24/2002 15 42 2694671118 AGE STOCKTON PAGE 09 <br /> 31 January 2002 <br /> .ACTb-NC Pioject No 95-0128 <br /> Page 8 of 8 <br /> Factors controlhng effectiveness of ground water extraction are soil hydrogeologic properties, <br /> dissolved hydrocarbon mass distribution, and adsorption affinity of the hydi ocarbons to the soil <br /> matrix The soil at the site has a high percentage of fine-gi ained matrix and overall is homogenous <br /> and mostly fine-grained, fostei ing 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 gi ound water extraction should be effective on the site Ground water extraction rates <br /> are not likely to exceed the pilot test i ate, and may be less for effective ground water extraction and <br /> stabilized drawdown ,AGE i ecom-mends preparation of a remedial action work plan for the <br /> installation of additional ground water extraction wells surrounding the former UST area to increase <br /> the effectiveness of ground water extraction to adds ess the dissolved hydrocarbons and operation of <br /> a ground water extraction treatment system <br /> This technology should be conducted m 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 pi ofessional sei vices were pei formed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this of strnilai localities The findings were based tnamly upon <br /> analytical iesults provided by an independent laboratory Evaluation of the geologiobydro-geologic <br /> conditions at the site for the purpose of this investigation were made from a limited number of <br /> available data points (Solinst Levelogger data, gi ou>nd water- data, ground water samples), and <br /> subsurface conditions may vary away from these data points No other warranty, expressed or <br /> implied, is made as to the professional recommendations contained in this report <br /> 4dvanred Geo Environmental inc <br />