ARCHIVED REPORTS XR0001806 - Laserfiche WebLink

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Is Date March 8,2005 Quarter I"Quarter,2005 DISCUSSION: Two monitoring wells were installed (MW-4 and MW-5) during fourth quarter 2004 and initially sampled on December 13, 2004 The data for the groundwater sampling were received after the subrmssion of the Quarterly Groundwater Monitoring Report,Fourth Quarter 2004 (URS, 2004) Toluene and total xylenes were detected above laboratory reporting limits in the groundwater sample collected from site monitoring well MW-5 at 0 55 rmcrograms per Inter(Itg/L) and 0 84µg/L,respectively No other analytes were detected above laboratory reporting limits during the December 13,2004,sampling event No contaminants of concern were detected above laboratory reporting lints in monitoring wells MW-4 and MW-5 during the January 12,2005,regularly scheduled quarterly monitoring event Gasoline range organics(GRO),benzene, total xylenes, methyl tert-butyl ether(MtBE),and I,2-dichloroethane (1,2- DCA) were detected above laboratory reporting limits in groundwater samples collected from site monitoring wells MW-1 through MW-3 this quarter In MW-2, benzene was detected dust above laboratory reporting limits (0 71 pg/L) for the first time since July 2003 Other analyte concentrations were generally consistent with the historic data Groundwater elevations in site wells generally increased relative to the previous monitoring event The inferred groundwater flow direction was toward the southwest at an average hydraulic gradient of 0 02 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 I Groundwater Elevation and Analytical Data . Table 2 Fuel Oxygenates Analytical Data Table 3 Groundwater Gradient Data FIGURES Figure I Groundwater Elevation Contours Figure 2 Groundwater Analytical Summary APPENDICES Appendix A Field and Laboratory Procedures Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets Appendix C GeoTracker Upload Confirmation K 1WprocessU5 HP ARC0\00760Qua 1cr1y1200511 QTR 055760GWMR 1Q05 dU Page 2