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Date. September 23,2003 <br /> Quarter, 3`d Quarter,2003 <br /> DISCUSSION: <br /> TPHg, benzene, toluene, ethylbenzene, total xylenes (BTEX), and methyl tert-butyl ether (MtBE) were reported <br /> above method detection limits in groundwater samples collected from site wells during this quarter TPHg and <br /> BTEX concentrations in MW-2 increased relative to previous quarters Concentrations of TPHg in MW-6 increased <br /> relative to the previous quarterly monitoring event The TPHg concentration in MW-4 decreased to the lowest level <br /> reported since March of 1988 Benzene was reported above method detection limits for the first time in AMW-6 <br /> since January of 1995 Ethanol and the fuel oxygenates tert-butyl alcohol (TBA), tert-amyl methyl ether (TAME), <br /> dm-isopropyl ether (DiPE), and ethyl tert-Butyl ether (ELBE) were added to the analyte list for groundwater samples <br /> collected from site wells this quarter Ethanol, TAME, DiPE, and EtBE were not reported above method detection <br /> limits in any groundwater samples collected from the site this quarter However,TBA was reported in MW-3 at 210 <br /> micrograms per liter (pg/L) MW-3 has a history of TBA being reported above method detection limits but not at <br /> this concentration Otherwise, reported concentrations were generally consistent with historic data reported from <br /> previous sampling events <br /> Groundwater elevations in the site monitoring wells generally decreased relative to the previous monitoring event <br /> The inferred direction of groundwater flow was to the north to northwest at an average gradient of 0 006 feet/foot <br /> (ft/ft) A regional groundwater elevation contour map and a regional groundwater analytical summary were created <br /> with data from the former Chevron service station at 575 Grant Line Road and the former Scotty's service station at <br /> 574 Grant Line Road <br /> This report is based on data, site conditions, and other information that are generally applicable as of the date of the <br /> report,and the conclusions and recommendations herein are therefore applicable only to that time frame <br /> • TABLES <br /> Table 1 Groundwater Monitoring and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> FIGURES <br /> Figure 1 Groundwater Elevation Contours <br /> Figure 2 Groundwater Analytical Summary <br /> Figure 3 Concentration and Water Level Trends (Well MW-2) <br /> APPENDICES <br /> Appendix A Field Data Sheets <br /> Appendix B Sampling and Analysis Procedures <br /> Appendix C Laboratory Analytical Reports and Chain-of-Custody Records <br /> Appendix D Former Chevron and Former Scotty's Groundwater Monitoring Data <br /> Appendix E GeoTracker Upload Confirmation <br /> K 1Wprocem'M BP ARC0U11941Quaneriy',7 QTR 03511194 GWMR 3Q03 doc Page 2 <br />