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' 20 June 2001 <br /> AGE-NC Project No 99-0624 <br />' Page 4 of 4 <br />' 0 MTBE was detected at concentrations of 3,800 µg/1 and 21 µg/1 in ground water samples <br /> from MW-2 and MW-3, respectively, the MTBE concentration in sample MW-2 was an <br /> Increase from the MTBE concentration of 2,700 µg/1 detected in March 2001 <br />' 0 Overall the TPH-g and BTEX concentrations show declining trends since monitoring began <br /> in November 1999, however, the MTBE concentrations show positive trends (see <br />' Appendix B) <br /> • The lateral extent of dissolved hydrocarbon-and MTBE-Impacted ground water has not been <br />' delineated northeast, east, and south of MW-2 <br />' 5.0. RECOMMENDATIONS <br /> Based on the results of this Investigation,AGE recommends continued quarterly monitoring of wells <br />' on-site <br /> I AGE recently submitted a work plan to the PHS-EHD to advance four Cone Penetrometer Test <br /> (CPT) paired borings at the site The CPT bonngs will help define the vertical as well as lateral <br /> extent of the contamination to the south,east and west The project is anticipated to occur during the <br /> third quarter of 2001 <br /> I6.0. LINIITATIONS <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 (a e ground water samples) and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or Implied, is made as to the professional <br /> recommendations contained In this report <br /> I <br /> i S <br /> Advanced GeeEnvironmental,Inc <br /> i � � <br />