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' GeofogicalTechnws 3nc Pae 4 <br /> Groundwater Monitoring Report <br /> Project No 723 2 <br /> . December 6, 1999 <br />' e DIPE was present in MW-3 <br /> • The groundwater sample collected from the old domestic well located at 60 East Castle <br />' showed the presence of low levels of Toluene and Xylene This well is not being used for <br /> a water supply and does not have a pump in it that could be activated so the potential for <br /> exposure to the public is minimal The well has a measured total depth of 70 feet The <br />' construction is unknown <br /> During field monitoring/well purging work, water quality parameters were measured, <br />' including Oxidation-Reduction Potential (ORP) The ORP results show a direct correlation <br /> of negative values for wells in the contaminated zone Thus suggesting that natural <br /> biodegradation of these chemicals is not a significant attenuation process To date, no wells <br />' are located outside the contaminated zone The domestic well did show positive ORP values <br />' 3.0 CONCLUSIONS & RECOMMENDATIONS <br />' Conclusions <br /> 1 The groundwater plume is not defined vertically or laterally <br /> 2 Groundwater flow trends to the northeast to east <br />' 3 High levels of BTEX and TPH are present in the groundwater of all wells <br /> 4 The fuel oxygenate MTBE has not been confirmed by EPA method 8260, however, DIPE <br /> and TBA have been <br />' Recommendations <br /> 1 Perform two more quarterly groundwater monitoring events before doing any further site <br />' investigation work The next monitoring event is scheduled in December 1999 <br /> 2 Due to the presence of the other oxygenated fuel compounds, the quarterly monitoring <br /> events should include analysis by EPA method 8260 <br />' 3 Complete the water well receptor survey for the site <br />' 4.0 LIMITATIONS <br />' This report was prepared in accordance with the accepted standards and practices of the <br /> field of environmental geology, groundwater hydrology and good business practices It <br /> should be recognized that definition and evaluation of environmental conditions is a <br />' difficult and inexact science Judgments leading to conclusions and recommendations are <br /> generally made with an incomplete knowledge of the site-specific conditions present <br />' The tasks proposed and completed during this protect were reviewed and approved by the <br /> local regulatory agency for compliance with the law No warranty, expressed or implied, <br />' is made <br />