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404gica[r"eclmkslife. Page 4 Groundwater Monitoring Report Project No. 9$9.2 November 14,2003 ' 2.2 Groundwater Analytical Results ' • Low concentrations of BTEX constituents were present in MW-1 and MW-4. A trace of total xylenes was detected in MW-3. • No constituent of BTEX was found in the remaining monitoring wells. • Low concentrations of TPH-G were detected in MW-1 and MW-4. TPH-G was not present in any other monitoring wells. ' • Low concentrations of MTBE were present in MW-1,MW-4, MW-5, MW-6, MW-8 and MW-9. The levels are consistent with previous monitoring events. • Concentrations of MTBE in MW-4, MW-6, and MW-9 decreased since the last ' groundwater-monitoring event. • A plot of TPH-G versus groundwater elevation for MW-1 shows that generally the concentrations of TPH-gasoline fluctuate with groundwater elevation and that the ' overall concentrations have decreased two orders of magnitude over time. • Historically, the fuel oxygenates DIPS, ETBE, TAME and TBA as well as 1,2 DCA and ' EDB have not been detected in any of the site's monitoring wells. This holds true for the new monitoring wells. These constituents are no longer analyzed in groundwater samples collected at this site. MLaboratory Data Sheets are included in Appendix C. The data are summarized in Table 2 of Appendix A. Chart 1 is a plot of TPH-G 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 an YSI 3560 Floweell meter. During this ' groundwater-monitoring event, dissolved oxygen was measured in all the wells using an YSI dissolved oxygen meter. These measurements are summarized in Table 3 of Appendix A and in the field logs of Appendix B. 3.0 CONCLUSIONS AND RECOMMENDATIONS The following conclusions have been drawn from the data generated from this site ' investigation work: