ARCHIVED REPORTS_XR0007553 - Laserfiche WebLink

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Date, July 30,2004 Quarter. 2nd Quarter,2004 DISCUSSION: Gasoline range organics (GRO), benzene, toluene, ethylbenzene, total xylenes (BTEX), and fuel oxygenates (including methyl tert-butyl ether (MtBE) and ethanol) were reported as below method detection limits in the final sampling event at TEX-1 that occurred on September 18,2003 Analytical results from the final sampling of TEX-1 prior to the wells destruction in January 2004 are summarized in Table 1 and Table 2 and the laboratory analytical report is included in Appendix B 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) were added to the analyte list during this sampling event Neither analyte was reported above method detection limits in groundwater samples collected from site wells this quarter GRO and MtBE were reported above method detection limits in groundwater samples collected from site monitoring wells this quarter Analyte concentrations were generally consistent with historic data Groundwater elevation in site wells generally decreased relative to the previous monitoring event The inferred direction of groundwater flow across the site was toward the north-northeast at an average hydraulic gradient of 0 005 ft/ft This report is based on data, site conditions, and other information that are generally applicable as of the date of the report,and the conclusions and recommendations herein are therefore applicable only to that time frame TABLES Table 1 Groundwater Elevation and Analytical Data Table 2 Fuel Oxygenates Analytical Data Table 3 Groundwater Gradient Data FIGURES Figure 1 Groundwater Elevation Contours Figure 2 Groundwater Analytical Summary APPENDICES Appendix A Field and Laboratory Procedures Appendix B Laboratory Analytical Reports,Cham-of-Custody Documentation,and Field Data Sheets Appendix C GeoTracker Upload Confirmation K 1WprommV5 RP ARCOr020931Qeamertyl2 QTR 8412093 GWMR 2Q04 doe Page 2