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1 <br />' 17 December 2004 <br /> AGE-NC Project No 95-0130 <br />' Page 6 of 6 <br />' remediation results is forthcoming and will be reported in Quarterly Report-Fourth Quarter <br /> 2004 <br /> • Continued quarterly depth to water measurements in all monitoring wells at the site, but <br />' reduced ground water sampling frequency from a quarterly to a semi-annual program, AGE <br /> believes that continued quarterly ground water sampling from these wells at this stage of the <br />' investigation is not cost effective and will not provide enough useful Information to <br /> supplement the ongoing Investigation Semi-annual sampling events should be adequate to <br /> monitor ground water impact at these wells and should be re-evaluated on a semi-annual <br />' basis <br /> • The most intense hydrocarbon-Impact was reported in the ground water samples collected <br /> from soil vapor extraction wells VW-1/2/3 with TPH-g as high as 180,000 µg/1, benzene as <br /> high as 60,000 �tg/l and MTBE as high as 2,300 µg/1 Furthermore, the site recently under <br /> went building demolition, and the site is temporarily wide open with no building or surface <br /> obstructions Therefore, AGE recommends installing two-inch diameter pneumatic ground <br /> water pumps in VW-1C (48-63 feet), VW-2A (43-63 feet) and VW-3A (43-63 feet) to <br /> augment interim ground water remediation efforts, extracted ground water from wells <br /> VW-I C,VW-2A and VW-3A would be routed to the existing ground water pump-and-treat <br /> system <br /> 6.0. 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 mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points(ground water samples), and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional Interpretations, <br /> opinions and recommendations contained in this report <br /> I <br /> I <br /> f <br /> i <br /> IAdvanced GeoEnvironmental,Inc <br />