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r r <br /> • 20 October 2003 <br /> AGE-NC Project No 95-0109 <br /> Page 4 of 4 <br /> • TPH-g and BTEX compounds were not detected in any of the newly installed wells(MW-15 <br />' through MW-19) The lateral and vertical extent ofpetroleurn hydrocarbon-impacted ground <br /> water has been defined - _ ­ 1, _ ,r <br />' 1,2-DCA was detected in samples collected from wells MW-7,MW-9,MW-14 and MW-16 <br /> at concentrations ranging from 0 76 µg/1 (MW-7) to 22 [tg/l (MW-16) 1,2-DCA was not <br />' detected in any of the newly installed deeply-screened wells The vertical extent of the <br /> 1,2-DCA contamination appears to be defined 1,2-DCA was detected in well MW-16 <br /> (screened from 50 to 70 feet bsg),which is the most southern well in the network Therefore, <br /> the Lateral extent of 1,2-DCA-Impacted ground water has not been fully defined toward the <br /> south of well MW-16 <br /> • The extent of petroleum hydrocarbon-impacted ground water appears to be contained within <br />' the current on- and off-site well netw6rk The southern lateral extent of 1,2-DCA-impacted <br /> ground water Is not fully defined <br /> t <br /> • 5.0. RECOMMENDATIONS <br />' Based upon data collected from the site, AGE recommends <br /> O Continued quarterly groundwater monitoring as required by Clean-up and Abatement Order <br /> No 93-701 The next groundwater monitoring event will be scheduled for December 2003 <br />' • ln'order to mitigate the residual dissolved contamination (benzene) In the area of wells <br /> MW-1,MW-4 and MW-14,Implementation of a six-month ozone Injectionpilot remediation <br /> study around the former dispenser area and east to well MW-14 <br />' Should 1,2-DCA concentrations continue to Increase In well MW-16, during subsequent <br /> sampling events, AGE recommends installation of a monitoring point (soil bonng) ,or <br /> shallow-screened ground water monitoring well as required by Clean-up and Abatement <br /> Order No 93-701, south of MW--16 to define the lateral extent of dissolved 1,2-DCA <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 /> geologic/hydrogeologic conditions at the site for the purpose of this Investigation are trade from a <br /> limited number of available data points (i a soil and ground water samples) and subsurface ' <br /> Advanced GeoEnwonmental,Inc <br />