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� , r <br /> 40 <br /> S 23 January 2004 y # <br /> "AGE-NC Project No 97-0312 <br /> Page 4 of 4 r <br /> During the September 2003 monitoring event TPH-g,benzene and toluene were detected in ` <br /> the water sample collected from monitoring well UST-5 MTBE was detected in the sample <br /> collected from well UST-6 ple <br /> I <br /> I <br /> During the September 2003 monitoring event 1,2-DCA was detected in samples UST-5 and ! � <br /> UST-6 at'concentrations above the DHS Maximum Contaminant Level(MCL)of 0 5 µg/1 <br /> The reported concentrations and IateraI exte <br /> relatively stable during the nt of analytes of concern have remained ry <br /> past three years of monitoring-Based on the analytical results of <br /> the ground water sample collected from UST-7, the vertical extent ofetroleum <br /> hydrocarbon-impacted ground water at the site appears to be limited p <br /> uppermosi <br /> hydrogeologic zone The source of the PCE detected in UST-7 is unknown to AGE and r <br /> be from an off-site source <br />' 5•0• RECOMMENDATIONS <br /> Based on the results of this and previous quarterly q y ground water monitoring events, AGE <br /> recommends continued monitoring of the on-site monitoring and domestic wells <br /> 6.0. LIMITATIONS <br /> ' E <br /> Our professional services were performed using that degree of care and skill ordinarily exercised b <br /> ' environmental consultants practicing in this or similar=localities The y <br /> Endings were based mainly <br /> - F upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic <br /> conditions at:the site for thc'purpose of this investigation was made from a limited nuriber of <br /> available data'points (i a monitoring wells aiid'dome'stic <br /> well <br /> may vary away from these data points No other warranty, expressed orimplied, <br /> usfmade aace s to the <br /> professional iiiterpretatioDs, Eopinions andIrecommendain <br /> hons contained in this report <br /> A <br /> Y li <br /> u <br /> I i <br /> ! IY <br /> t Ir ! ! E I S In ! <br /> I Ii I <br /> Y <br /> Advanced GmEnvironrnental,Joe <br /> _ <br /> t I EI ) <br /> ll ^ I <br />