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C,¢alagicaI Technics Inc. Page 5 <br /> Groundwater Monitoring Report <br /> Project No. 989.2 <br /> April 25, 2002 <br /> 3.2 Groundwater Analytical Results <br /> ' • Low concentrations of BTEX were present in MW-1 & 4. <br /> • Low concentrations of TPH-gasoline were present in MW-1 & 4. The levels have <br /> t decreased from the December 2001 monitoring event and for MW-I the concentrations <br /> have significantly decreased since March 1996. <br /> • No BTEX or TPH-gasoline were found in MW-2, 3, 5 & 6. <br /> ' • Low concentrations of MTBE were present in MW-4, MW-5 and MW-6. The levels are <br /> consistent with previous monitoring events. MW-5 and MW-6 show a slight decrease <br /> since the December 2001 monitoring event. MW-4 shows a slight increase since the <br /> December 2001 monitoring event. <br /> • MTBE was non-detect in wells near the former tank area, MW-1, MW-2 and MW-3. <br /> ' This has been consistent during the previous five quarterly monitoring events. <br /> • A plot of TPH-gasoline versus groundwater elevation for MW-1 shows that generally <br /> the concentrations of TPH-gasoline fluctuate with groundwater elevation. <br /> • The fuel oxygenates DIPE, ETBE, TAME and TBA as well as 1,2 DCA and EDB have <br /> not been detected in any of the site's monitoring wells. <br /> Laboratory Data Sheets are included in Appendix C. The data are summarized in Table 1 of <br /> Appendix A. Chart 1 is a plot of TPH-gasoline versus groundwater elevation for MW-1. <br /> tDuring purging of the monitoring wells, field measurements of the oxidation-reduction <br /> potential (ORP) of the water were taken using a YSI meter. These measurements are <br /> summarized in Table 3 of Appendix A and the field logs in Appendix B. The results <br /> ' suggest that the plume reaction with the groundwater follows a seasonal pattern. Further <br /> discussion will follow the installation and monitoring of additional wells. <br /> t <br /> 1 <br />