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L H <br /> 1"tk , I-1- ,�: - d i i ; Y 1 1 �'; - I s ° •'..t 9 ,, <br /> r " / <br /> i <br /> �a I S J ,1/ SOr <br /> 2 5 April-'2005 <br /> 'AGE-NGProject No 98,004 <br /> Page 3 of 4 L r 1 { <br /> Project No:CT214.0411037) ,quality assurance and quality control (QAIQC) report; and chain of <br /> custodf farm are in&luded ln`Appendix C.,,' <br /> 4.0. .'SUMMARY AND CONCLUSIONS r. <br /> Based onthe-findings from this_irivestigation, AGE`concludes: <br /> Ground-water elevation at the.site averaged approximately 20.82.feet below-MSL,indicating <br /> an average.decrease in ground water elevation of 1.20 feet since the last-nionitoring event ill <br /> August 2004. <br /> • Ground water was inferred to be flowing.toward the south-southwest under a hydraulic <br /> gradient of approximately 0.01 ft/ft;'-the ground water flow direction is consistent with,• ' <br /> historical flout directions at this site., <br /> • TPH-g and MTBE were detected in the ground water sample collected from well'MW-1 at <br /> concentrations of 100µg11 and 98µg11,respectively.With the exception of 1,2-DCA detected <br /> in well MW-1 at the time of the initial ground water sampling event on 07 April 2003, no <br /> other target analytes have been detected in wells MW-1 through MW,-3. <br /> • The concentration of MTBE.is above the DHS' Maximum Contaminant Level=(MCL) of <br /> 13 µg11 for drinking water. <br /> • The lateral extent of the dissolved MTBE plume is not yet defined to the north or west of the <br /> „ site. <br /> 5.0.- RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends: ' <br /> Continuation ofquarterly ground. water rrionitoi7ng'at the 'site;,'tho first quarter•2005 <br /> monitoring event was performed in February 2005. <br /> • AdditionaTsite assessment to determine the vertical and lateral extents of dissolved MTBE. . <br /> ;' Advanced GeoEnvironmcntal,Inc. <br />