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z' <br /> Date, May 4,2004 <br /> Quarter 11`Quarter,2004 <br /> • Based on the review of the analytical and hardcopy data (chain-of-custody records blanks dilutions holding times, <br /> Y PY { Y � g <br /> LCS/LCSD results,MS/MSD results, and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> with the following Iimitations <br /> • The reported results for gasoline range organics (GRO) in samples MW-1, MW-2, MW-3, MW-4,MW-5, and <br /> MW-6 are due to a discrete peak at C5 (probably MtBE) <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte(s) <br /> DISCUSSION: <br /> GRO and methyl tert-butyl ether (MtBE) were reported above method detection limits in groundwater samples <br /> collected from site monitoring wells this quarter MtBE concentrations decreased in monitoring wells MW-1,MW-3, <br /> and MW-4 this quarter In MW-2,MtBE concentrations decreased to the Iowest level reported historically In MW- <br /> 5, MtBE increased to the highest level reported since sampling began in April 2003 A low concentration of GRO <br /> was reported in MW-7 for the first time since sampling began in April 2003 <br /> Groundwater elevations in site monitoring wells decreased relative to the previous monitoring event The inferred <br /> direction of groundwater flow across the site was to the south-southwest at an average gradient of 0 001 feettfoot <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 Elevation 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-3) <br /> APPENDICES <br /> Appendix A Field Data Sheets <br /> Appendix B Sampling and Analysis Procedures <br /> Appendix C Analytical Reports and Chain-of-Custody Records <br /> Appendix D GeoTracker Upload Confirmation <br /> KNWPr cssV5BPARC01I119I1Quaner1yl1QTR04V1191GWMR1Q04doc Page <br />