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20 May 2004 <br /> AGE-NC Project No 98-0521 <br /> Page 8 of 9 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> 3rd Quarter 2003 <br /> The following conclusions were drawn from the results of the July and September 2003 <br /> investigations <br /> • Target analytes were not detected above laboratory reporting limits in the soil samples <br /> collected from pilot boring MW-5 <br /> • Ground water at the site was encountered at approximately 8 5 feet bsg Ground water flow <br /> direction at the site was generally toward the northeast The ground water hydraulic gradient <br /> was estimated to be 0 0009 foot/foot <br /> • TPH-g was detected in sample MW-4,BTEX compounds were detected in samples MW-4 <br /> and MW-5,MTBE was detected in samples collected from wells MW-1 through MW-5,and <br /> TBA were present in the sample from MW-5, located within the former UST area <br /> • TPH-d was detected in ground water samples collected from wells MW-4 and MW-5 <br /> However,there is no record of the use of diesel at the site The lab report indicates that the <br /> TPH-d detections exhibit gasoline range compounds or have no recognizable pattern AGE <br /> believes that the TPH-d detections are anomalous <br /> • The concentrations of benzene detected in samples MW-4 and MW-5 were above the DHS's <br /> Primary Maximum Contaminant Level (MCL) of 10 gg/l in drinking water The <br /> concentrations of MTBE detected in samples MW-1 through MW-4 were above the DHS's <br /> Secondary MCL of 5 µg/1 in drinking water <br /> 4`' Quarter 2003 <br /> The following conclusions were drawn from the results of the December 2003 investigation <br /> • Ground water at the site was encountered at approximately 7 7 feet bsg The prevailing <br /> ground water flow direction at the site was generally toward the northeast The ground water <br /> hydraulic gradient was estimated to be 0 009 foot/foot <br /> • TPH-g was detected in samples MW-2 and MW-4,benzene,ethylbenzene and total xylenes <br /> were detected in sample MW-4, and MTBE was detected in samples collected from wells <br /> MW-2 and MW-4 <br /> • The concentration of benzene detected in the sample MW-4 was above the DHS's Primary <br /> MCL of 10µg/1 in drinking water The concentrations of MTBE detected in samples MW-2 <br /> and MW-4 were above the DHS's Secondary MCL of 5 µg/1 in drinking water <br /> Advanced GcoEnvironmental,Inc <br />