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1 , <br />' 15 April 2003 ' <br /> • AGE-NC Project No 95-0109 <br /> Page 4of5 <br /> • One or more BTEX compounds were detected in the same samples at concentrations as high <br />' as 21 µg/1 benzene (MW-14), 8 5 µg11 toluene(MW-14),44 µg11 ethylbenzene(MW-8) and <br /> 68 gg/l total xylenes (MW-8) <br /> • TPH-g and BTEX compounds were not detected in any of the newly installed wells(MW-15 ry <br /> throughMW-19) The lateral and vertical extent of petroleum hydrocarbon-Impacted ground <br /> water has been defined <br />' • 1,2-DCA was detected in samples collected from wells MW-7,MW-8,MW-9,MW-14 and <br /> MW-16 at concentrations ranging from 0 55 µg/l(MW-7)to 69 gg/1(MW-14) 1,2-DCAwas <br /> not detected In any of the newly Installed deeply-screened wells the vertical extent of the <br /> 1,2-DCA contamination appears to be defined However, 1,2-DCA was detected in well <br /> MW-16 (screened from 50 to 70 feet bsg), which is the most southern well In the network <br />' Therefore,the lateral extent of 1,2-DCA-Impacted ground water has not been defined toward <br /> the south of well MW-16 <br /> • The extent of petroleum hydrocarbon-Impacted groundwater appears to be contained within <br /> rthe current on- and off-site well network The southem lateral extent of 1,2-DCA-impacted <br /> ground water is not defined <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected from the site AGE recommends <br />' • Continued quarterly ground water monitoring as required by Clean-up and Abatement Order <br /> No 93-701 The next ground water monitoring event will be scheduled for June 2003 <br /> • If 1,2-DCA concentrations do not decrease in well MW-16 in subsequent sampling events, <br />' AGE recommends Installation of an additional shallow-screened ground water monitoring <br /> " well south of MW-16 to define the lateral extent of dissolved 1,2-DCA as required by Clean- <br /> up and Abatement Order No 93-701 <br /> 1 <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 upon field <br /> measurements and analytical results provided by an independent laboratory Evaluations of the <br /> hydrogeologic' conditions at the site for the purpose of this investigation are made from a limited number of available data points (I e ground water samples) and subsurface conditions may vary <br />' Advanced GeoEnvironmental,Inc <br />