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I <br /> I30 December 1999 <br /> . AGE-NC Project No 95-0104 <br />' Page 7of7 <br /> the July-August-September-October 1999 portion of the SVE pilot test, the shallow curve <br />' demonstrates that vapor concentrations were extracted at a diminishing rate The plot depicts <br /> an asymptotic line during the November-December portion of the pilot test demonstrating <br />' minimal effectiveness <br />' 60. RECOMMENDATIONS <br /> Based upon the results of this investigation, AGE recommends <br />' • Reduction of quarterly monitoring/sampling events to semi-annual monitonn sam lin <br /> g <br />' events until the site receives a site closure <br /> • At least one confirmation soil boring located near VW-1, information obtained from the <br /> confirmation soil boring will be utilized for fate and transport modeling of petroleum <br />' hydrocarbons so that the site can be considered for closure as a low risk ground water site <br />'• 7.0 LIMITATIONS <br />' 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 upon <br /> analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic <br />' conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points (i e monitoring wells, ground water samples and soil gas 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 /> 1 <br /> • <br /> I <br />' Advanced GcoEn%tronmental,Inc <br />