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I , <br /> I i < <br /> , , I <br /> I 1 <br /> 21 December 2001 <br /> t AGE-NC Project No 98-0521 <br /> Page 4 of 4 <br /> ' f <br /> 4 0, SUMMARY AND CONCLUSIONS I <br /> I <br /> The following conclusions were drawn from the results of tions investigation <br /> ' <br /> • Ground water, at the site was encountered at approximately 7 S feet bsg The prevailing <br /> ' ground water flow direction at the site has been generally toward the northeast for six <br /> monitoring events The groundwater hydraulic gradient was estimated to be Q 008 foot/foot <br /> • Dissolved phase hydrocarbons, includingy TPH-g, BTEX and MTBE, are present`at <br /> significant concentrations in the sample from well NIW-4, within the former UST area <br /> I <br /> MTBE was encountered in samples collected from MW-2 and,MW-1, down-gradient and ' <br /> cross-gradient, respectively, from the former UST area <br /> 1 Additional site assessment will be required to fully assess the down-gradient and vertical <br /> extent of the dissolved hydrocarbons and MTBE <br /> ! <br /> 5.0 RECOMMENDATIONS <br /> ' � 1 <br /> Based on the results of this investigation, AGE recommends ; <br /> ` F � Continuation�of quarterly monitoring at the site The next monitoring event should'be <br /> scheduled'for February 2002 <br /> 1 1' <br /> • Installation'of one additional monitoring well northeast of the site to assess the lateral extent <br /> of dissolved hydrocarbons and fuel'additives'in ground water <br /> i' Preparation of a w, ork'plan addendum to delineate the vertical 'extent`of hydrocarbon-i <br /> impacted ground water' <br /> I , I 6.0. LIMITATI ONS „ <br /> I , ! <br /> ' , Our profess ional'ser`vices were performed using that degree of care and skill,ordinanly exercised by <br /> II II , I ' 1 F 1 1 ' 1 1 1 l <br /> environmental'consultants practicing in this or similar localities The findings were based mainly <br /> I €upon analytical' 'results provided by ' an' independent, laboratory „ Evaluations, of ,the t <br /> geoiogic/liydrogeolagic conditions at the site for the purpose�of this investigation are made from a k <br /> limited number' of available data points (i a monitormg,wells ,'and ground water samples), afid <br /> subsurface conditions may vary`away from these data points No other warranty, expressed of <br /> I implied, is made as to the professional recommendations contained in this report <br /> , I r <br /> J 1 I i 1'J <br /> 1 1 , I Advanced GeoBuvlromnental,Inc I I <br /> f <br /> I ,e <br /> �' ar <br />