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r28 October 2005 <br /> AGE-NC Project No 95-0141 <br /> Page 5 of 5 <br /> 1,2-DCA levels detected in MW-5 may be due in part to commingling with contamination <br /> iat 1601 Turnpike Rd <br /> • EDB was detected in ground water sample EX-1 at a concentration of 92 µg11 EDB has been <br /> detected intermittently in well EX-1, located near the former UST location This quarter's <br /> concentrations are significantly lower than the past three monitoring events,which showed <br /> concentrations ranging from 230-300 ug/l <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this and previous investigations, AGE recommends <br /> • Continued quarterly monitoring of the ground water monitoring network <br /> • Preparation of a work plan for interim remediation of petroleum hydrocarbon-impacted <br /> ground water at the site and vertical definition of the dissolved hydrocarbons and additives <br /> in the source area as previously proposed The western area,under the main office building, <br /> appears to cover the highest dissolved mass at the site,therefore limited access technology <br /> may be required to assess hydrocarbon-impact in this area <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 GeoEnvironmcntal,Inc <br />