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i <br /> I02 June 2005 <br /> AGE-NC Project No 95-0130 <br /> Page 13 of 13 <br />' MW-6 (A-E) and MW-7 (A-E) The Second Quarter 2005 ground water monitoring event <br /> is tentatively scheduled for 06 June 2005 <br /> • Conduct future ground water monitoring events concurrently with the Knowles/Roek <br />' Property site(102 South Wilson Way) and the Arco AM/PM site(130 South Wilson Way), <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 rt <br /> believes that continued quarterly ground water sampling from wells MW-1 through MW-5 <br /> at this stage of the investigation is not cost effective and will not provide enough useful ` <br />' information to supplement the ongoing investigation Semi-annual sampling events should <br /> be adequate to monitor ground water impact at these wells and should be re-evaluated on a <br /> semi-annual basis <br />' The most intense hydrocarbon-impact was reported in the ground water samples collected <br /> from soil vapor extraction wells VW-11213 with TPH-g as high as 230,000 µg11,benzene as <br />' <br /> high as 87,000 µg/1 and MTBE as high as 5,400 µg/l Furthermore, the site recently <br /> underwent building demolition, and the site is temporarily wide open with no building or <br /> surface obstructions Therefore, AGE recommends installing two-inch diameter pneumatic <br />' ground water pumps in VW-1C (48-63 feet),VW-2A(43-63 feet)and VW-3A(43-63 feet) <br /> to augment interim ground water remediation efforts, extracted ground water from wells <br /> VW-I C,VW-2A and VW-3 A would be routed to the existing ground water pump-and-treat <br />' system <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 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 (soil vapor samples, ground water samples), and subsurface conditions may <br /> vary away from these data points No other warranty, expressed or implied, is made as to the <br />' professional interpretations, opinions and recommendations contained in this report <br /> 1 <br /> • <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />