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W !- <br /> ,..{ 4 ,• t: <br /> � �"1 3rr ��i ! S �° ti n �:, 'f - . , �� F a•.ap d '! tj! <br /> t <br /> 7't-• •��/�f <br /> 23°Janu '2006 <br /> ,4 'L <br /> �'y fa. -. t <br /> ,. IAG_,NC 'j <br /> No;98.0504 �� '> <br /> f r, l i <br /> tl �r Page'3of 4 tr r, 4 <br /> i .- <br /> .,� No additional petrol'eurn hydrocarborf compounds wete detected in the samples analyzed.Analytical . <br /> u; 'results frorn the,ground water: saimples; ,are.surnmarized in Table 2. The laboratory report (CTEL <br /> Pr6ject-No.:CT214-0509028);quality.assurance and.quality control (QA/QC)report's, and chain of; <br /> custady'form are included in Appendix C. <br /> 4.0. SUMMARY AND CONCLUSIONS' ,Y ` <br /> Based ori the findings from'this investigation,'AGE concludes: <br /> • . At the time of the September 2005 sampling event,depths to ground water at the,site ranged l , <br /> from 26.69'feet;to 27.09 feet below the tops of the well casings. Ground water elevation at <br /> Ahe site averaged approximately 18.16'feet.below MSL, indicating an average,decrease in <br /> . ground water elevation of 1.39 feet since the'last monitoring event-in June Tune 2005. <br /> 'Ground water was inferred to be flowing toward the southwest under a hydraulic gradient'of. <br /> approximately 0.009 ft/ft;the ground water flow direction is consistent-with historical flow <br /> 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 200 ggll and 210 µg/l, respectively. With the exception of 1,2-DCA <br /> 'detected in well-MW-1 at the time of the initial ground water-sampling event'on 07 April , <br /> 2003,,no 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 µg/1 for drinking water. <br /> The.lateral'extent of dissolved MTBE plume isnot yet defined generally west of the site.• • , <br /> 5.0. RECOMMENDATIONS <br /> ;Based on the findings ofthe environmental activities recounted in this report, AGE recommends: <br /> ' Continuation of-quarterly ground water monitoring at the site; the fourth quarter 2005 , <br /> monitoring event'was performed•on 25 November 2005. <br /> Additional site-asse'ssm' ent to determine the vertical and-lateral extents of dissolved MTBE'. <br /> YA <br /> J.. � <br /> ' ,' Advanced GeOEnvironmental,Inc. ��� <br />