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Creolagical Tuknicslrcc Page 4 ' Groundwater Monitoring Report Project No. 989.2 July 29,2002 2.2 Groundwater Analytical Results ' • Low concentrations of BTEX were present in MW-1 and the concentrations have steadily decreased since 1996. ' • No constituent of BTEX was found in MW-2, 3, 5 & 6. • Low concentrations of MTBE were present in MW-4, MW-5 and MW-6. The levels are consistent with previous monitoring events. • MW-4 and MW-5 show a slight decrease since the March 14, 2002, monitoring event. • MW-6 showed a slight increase since the March 2002 monitoring event. ' • MW-1, MW-2 and MW-3, the monitoring wells closest to the former tank pit, were non- detect for MTBE. These wells have been consistently non-detect for MTBE since July ' of 2000. • A plot of TPH-gasoline versus groundwater elevation for MW-1 shows that generally the concentrations of TPH-gasoline fluctuate with groundwater elevation and that the ' concentration is decreasing. • Historically, the fuel oxygenates DIPE, ETBE, TAME and TBA as well as 1,2 DCA and EDB have not been detected in any of the site's monitoring wells. o Data Sheets are included in Appendix C. The data are summarized in Table 2 of Laboratory pp Appendix A. Chart I is a plot of TPH-gasoline versus groundwater elevation for MW-1. I During purging of the monitoring wells, field measurements of the oxidation-reduction ' potential (ORP) of the water were taken using a YSI meter. These measurements are summarized in Table 3 of Appendix A and in the field logs of Appendix B. The results suggest that the plume reaction with the groundwater follows a seasonal pattern. Further discussion will follow the installation and monitoring of additional wells.