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• TABLE OF CONTENTS <br />' 1 0 INTRODUCTION .. . . .... . .. ... . . .. . . .. . . . ... .1 <br /> 2.0 SITE BACKGROUND . . . .. . . ...... .. . . .. ..... .. . .. . . ... ...... . ..... .. ... .1 <br />' 3 0 QUARTERLY GROUNDWATER MONITORING--APRIL 2001 . ..... .. . .. .. . 2 <br /> 3 1 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS 2 <br /> 3 2 GROUNDWATER SAMPLING 2 <br /> 4 0 GROUNDWATER MONITORING RESULTS .. . .. .. . ... .... . . . 3 <br /> 41 GROUNDWATER ELEVATION CONTOURS 3 <br />' 4 2 LABORATORY ANALYSES 3 <br /> 4 3 SOIL VAPOR EXTRACTION SYSTEM 5 <br />' S 0 DISCUSSION OF RESULTS . . .. .. . . .. . ... . 5 <br /> 51 DISCUSSION OF GROUNDWATER ELEVATIONS 5 <br /> 5 2 DISCUSSION OF ANALYTICAL RESULTS 6 <br />' 5 2 1 DISCUSSION OF BENZENE CONCENTRATIONS 6 <br /> 5 2 2 DISCUSSION OF MTBE CONCENTRATIONS 6 <br /> 5 2 3 DISCUSSION OF OTHER ANALYTE CONCENTRATIONS 7 <br /> I6 0 RECOMMENDATIONS ... .. ... ... ... . ... .., .. .. . .8 <br />' . LIST OF APPENDICES <br /> APPENDIX A <br /> Figure 1 Vicinity Map <br /> Figure 2 Groundwater Elevation Contour Map April 10,2001 <br /> Figure 3 Hydrograph and Hydrograph Table <br /> Figure 4 MTBE Concentration Contours for April 11,2001 <br /> Figure 5 Benzene Concentration Contours for April 11, 2001 <br /> Figure 6 Benzene (MW-1) and GWE vs Time <br /> Figure 7 Benzene (MW-2) and GWE vs Time <br /> Figure 8 Concentrations of Benzene and MTBE vs Time for Soil Vapor Wells (SV-1 <br /> through SV-9) <br /> Figure 9 MTBE and GWE (MW-2) vs Time <br />' Figure 10 MTBE and GWE (MW-1) vs Time <br /> APPENDIX B <br /> Table A - Historical Groundwater Analyses (MW-1 through MW-8 and SVE wells) <br /> Groundwater Monitoring Field Forms (MW-1 through MW-8) <br /> APPENDIX C. <br /> Certificates of Analyses (MW-1 through MW-8) <br /> Chain-of-Custody <br /> APPENDIX D <br /> Soil Vapor Extraction System Log <br /> I <br /> CONDOR <br />