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26 September 2003 <br /> • AGE-NC Project No. 98-0500 <br />' Page 5 of 5 <br /> • 1,2-DCA was detected in seven samples at concentrations ranging from 2.1 µg/1 to 27 µ9/1. <br /> ' The lateral extent of 1,2-DCA has not been defined to the north for the intermediate- and <br /> deep-screened ground water intervals; the eastern boundary has not been defined, but high <br /> 1,2-DCA concentrations detected at the former River City Petroleum UST area 150 feet to <br /> the east suggest that the former UST area may be the source for the 1,2-DCA. <br /> • Various other VOCs were present in low concentrations in ground water samples OW-1, <br /> OW-2, MW-5, MW-10, MW-13 and MW-15, with the exception of well OW-1 are stable <br /> concentrations when compared to historical data. <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends: <br /> • Continue quarterly ground water monitoring. The next monitoring event is scheduled for <br /> October 2003. <br /> • AGE submitted a Corrective Action Plan, as required by the RWQCB by letter dated <br /> ' • 19 August 2002.Upon approval by the RWQCB,AGE recommends implementation of the <br /> corrective action plan to mitigate TPH/BTEX-impacted soil. <br /> 6.0. LIMITATIONS <br /> ' OurP rofessional 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 for the purpose of this investigation are made from a limited number of <br /> available data points(ground water samples),and subsurface conditions may vary away from these <br /> ' data points.No other warranty, expressed or implied,is made as to the professional interpretations, <br /> opinions and recommendations contained in this report. <br /> 1 <br /> • <br /> ' Advanced GeoEnvironmental,Inc. <br />