ARCHIVED REPORTS XR0001811 - Laserfiche WebLink

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�S Date June 1,2004 Quarter 2°d Quarter,2004 SBased on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, LCS/LCSD results, MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory with the following limitations • The elevated reporting limits in the Method 8260B analysis of sample MW-3 were due to the presence of high level non-target analytes in this sample • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a target analyte(s) DISCUSSION: Gasoline range organics (GRO), total xylenes, methyl tert-butyl ether (MtBE), and 1,2-dichloroethane (1,2-DCA) were reported above method detection hniits un groundwater samples collected from site wells this quarter 1,2-DCA concentrations increased in MWA,MW-2, and MW-3 this quarter but remain within historic ranges In MW-2,GRO and MtBE concentrations increased and total xylenes was reported at the highest concentration hnstorncally Groundwater elevations in site wells decreased relative to the previous momtonng event The inferred groundwater flow direction was to the southwest at an average hydraulic gradient of 0 004 feet/foot 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 tune frame TABLES Table I 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 4WP—cssV5 BP ARCM007601QuarurlyU QTR 04760 GWVA 2Q04 doe Page 2