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' 27 September 2004 <br /> i AGE-NC Project No 99-0559 <br />' Page 5 of 5 <br />' a During the first two quarters of 2004,an estimated 282 4 lbs of TPH-g, 35 bb lbs of benzene <br /> and 148 lbs of MTBE were extracted from ground water The contamination volumetric and <br /> mass removal calculations from the ground water pump-and-treat system are presented in <br /> tAppendix E <br /> • Since the initiation of the ground water extraction/treatment system in May 2003, a total of <br />' 530 lbs of TPH-g, 60 lbs of benzene and 157 lbs of MTBE have been extracted from ground <br /> water <br />' 5.0. RECOMMENDATIONS <br />' Based upon the results of ground water remediation in 2004, AGE recommends <br /> • Continued quarterly ground water monitoring at the site The next monitoring event should <br /> rbe scheduled for December 2004 <br /> • Continued operation and maintenance of the ground water extraction and treatment system <br /> lie <br /> MW-1 Interim ground water remediation should proceed to minimize the migration of the <br /> free-product and significant concentration of MTBE Due to the high mobility of MTBE, <br /> pump-and-treat should be continued to capture ground water in the area of well MW-2 <br />' a Additional subsurface assessment directly north,west and east of the UST area to determine <br /> the lateral extent of petroleum hydrocarbon-impacted and MTBE-impacted soil may be <br /> necessary The vertical extent of impacted soil and ground water should be assessed <br /> Implementation of the work plan addendum prepared for the site,dated 02 December 2003 <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 <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points(e g 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 /> Advanced GeoEnvironmental,Inc <br /> I <br />