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10 TABLE OF CONTENTS <br />' 1. INTRODUCTION...........................................................................................................................1 <br /> 2. SITE BACKGROUND........................................................................................................................1 <br />' 3. QUARTERLY GROUNDWATER MONITORING—APRIL 2001 .............................................1 <br /> 3 1 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS 2 <br />' 3 2 GROUNDWATER SAMPLING 2 <br /> 4. GROUNDWATER MONITORING RESULTS..............................................................................2 <br /> 4 1 GROUNDWATER ELEVATION CONTOURS 2 <br /> 4 2 LABORATORY ANALYSES (TPH-G, BTEX, OXYGENATES/ADDITIVES) 3 <br /> 5. DISCUSSION OF RESULTS ...........................................................................................................4 <br /> 5 1 DISCUSSION OF GROUNDWATER ELEVATIONS 4 <br /> 5 2 DISCUSSION OF ANALYTICAL RESULTS . 4 <br /> 5 2 1 DISCUSSION OF BENZENE CONCENTRATIONS 5 <br /> 5 2 2 DISCUSSION OF MTBE CONCENTRATIONS 5 <br /> 5 2 3 DISCUSSION OF OTHER ANALYTE CONCENTRATIONS 5 <br />' 6. RECOMMENDATIONS....................................................................................................................6 <br /> LIST OF APPENDICES <br />' APPENDIX A <br /> Figure 1 Vicinity Map <br />' Figure 2 Groundwater Elevation Contour Map—April 12,2001 <br /> Figure 3 Hydrograph/Hydrograph Table <br /> Figure 4 MTBE Iso-concentration Contour Map—April 12 and 13,2001 <br />' Figure 5 Benzene Iso-concentration Contour Map—April 12 and 13,2001 <br /> Figure 6 Benzene and GWE in MW-2 versus Time <br /> Figure 7 Benzene and GWE in MW-5 versus Time <br /> IFigure S MTBE and GWE vs.Time <br /> APPENDIX B <br /> I Table A-Historical Groundwater Analyses (MW-1 through MW-7) <br /> Groundwater Monitoring Field Forms (MW-1 through MW-7) <br /> Groundwater Measurement Field Form <br />' APPENDIX C <br /> Certificates of Analyses (MW-1 through MW-7) <br /> IChain-of-Custody <br /> I <br /> • <br />' t, CONDOR <br />