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i29 October 1998 <br /> i� AGE-NC Project No 98-0448 <br /> Page 9 of 9 <br /> I <br /> Intrinsid PernieabdityAnd SVE Effectiveness) Based on Information gained through fate <br />' evaluation laboratory analysis, the average permeability at the site was between 2 X 10 ' <br /> (MW-4 at 25 feet bsg) and 3 x 10-$ (MW-4 at 45 feet bsg) Results of the fate evaluation <br /> laboratory analysis Indicated permeability conditions at the site are adequate for SVE <br />' An unidentified faint to Intense odor was noted in soil sample duplicates collected from soil <br /> borings MW-4 at depths between 20 feet and 55 feet bsg, from MW-6 at depths between 30 <br />' and 40 feet bsg and from MW-7 at 40 foot bsg Each sample that contained the unidentified <br /> odor was noted on boring logs as having a dark blue color, organic, and non-detect utilizing <br /> a FID meter (lacking hydrocarbons) <br />' S 0. - RECOMMENDATIONS <br /> Based upon data collected during July and September 1998, AGE recommends <br /> • Continued quarterly ground water momtonng and sampling should be performed at the site <br /> • to achieve a better understanding of dissolved TPH-g concentrations at the site The next <br /> quarterly monitoring event is tentatively scheduled for December 1998 <br /> • Preparation of a work plan addendum for the installation of at least one soil vapor extraction <br />' (SVE) well and one in-situ air sparging (IAS) well as part of a site feasibility study Field <br /> parameters and analytical results collected from both the IAS pilot test and the SVE pilot <br /> study would assist in determining remedial feasibility at the site Upon completion of both <br />' IAS and SVE pilot test, a corrective action plan should be prepared and submitted to the <br /> PHS-EHD <br /> 60 LIMITATIONS <br /> 1 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 /> 1 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'soil and ground water samples from orings and monitoring wells), and <br /> 1 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 /> 1 <br /> 1 y <br /> Advanced GeoEnN ironmental,Inc <br /> 1 <br />