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' 26 June 2002 <br /> AGE-NC Project No 95-0141 <br />' Page 4 of 4 <br /> • BTEX constituents were detected in four of the eight ground water monitoring wells with <br />' concentrations as high as 8,400 pg/l benzene, 19,000 µg/1 toluene, 3,400 µg/1 ethylbenzene <br /> and 14,000 gg/l total xylenes in water sample MW-1 <br />' 0 Fuel oxygenates were not detected in any of the ground water samples collected <br /> • 1,2-DCA was detected in ground water samples collected from seven of the eight monitoring <br />' wells at the site at concentrations as high as 120 gg/l (MW-8), 1,2-DCA was not detected <br /> this quarter in ground water sample MW-1, although historically the highest concentrations <br /> of the analyte have been detected in samples collected from well MWA An explanation for <br />' the non-detection of 1,2-DCA in well MW-1 is unknown <br /> • EDB was not detected above laboratory reporting limits in the samples collected during the <br />' May 2002 monitoring event <br /> • The horizontal and vertical extent of contamination related to the former UST has not yet <br /> been defined In soil or ground water <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this and previous investigations, AGE recommends continued quarterly <br /> monitoring of the ground water monitoring network <br /> An AGE-prepared Work Plan Addendum, dated 09 April 2002,was approved by the EHD by letter <br /> dated 07 May 2002 The scope of work includes abandoning three `drowned' ground water <br /> monitoring wells, installation of additional shallow and deep ground water monitoring wells, <br /> installation of one ground water extraction well and performance of a ground water extraction <br /> feasibility test Upon pre-approval by the UST Cleanup Fund, AGE will schedule field work with <br /> the EHD <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 have been made from a limited number of available data points(i a monitoring <br /> wells and ground water samples) and subsurface conditions may vary away from these data points <br /> No other warranty, expressed or implied,is made as to the professional interpretations,opinions and <br /> recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />