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Semi-Annual Groundwater Monitoring and Quarterly Remediation Progress Report—First Quarter 20131 April 30,2013 <br /> Project#52.75118.2390 <br /> TABLE OF CONTENTS <br /> 1.0 SITE INFORMATION AND BACKGROUND....................................................... ................1 <br /> 2.0 GROUNDWATER MONITORING AND SAMPLING ...........................................{................2 <br /> 2.1 MONITORING AND SAMPLING PROCEDURES................................................. ...............2 <br /> 2.2 GROUNDWATER SAMPLE ANALYSIS................................................................................2 <br /> 3.0 REMEDIATION::....................:................................................................................................3 <br /> 3.1 OZONE INJECTION PERFORMANCE EVALUATION .........................................................3 <br /> 4.0 DISCUSSION /CONCLUSION.............................................................................I ..............4 <br /> 4.1 A-ZONE ................................................................................................................I................4 <br /> 4.2 B-ZONE ................................................................................................................................5 <br /> 4.3 C-ZONE ............................................................................................................... ................5 <br /> 4.4 PURGE AND RINSATE WATER DISPOSAL.......................................................i................6 <br /> 4.5 RECOMMENDATIONS .........................................................................................'................6 <br /> 5.0 LIMITATIONS........................................................................................................................7 <br /> I <br /> I <br /> LIST OF FIGURES <br /> Figure 1 Site Location Map <br /> Figure 2 Site Plan <br /> Figure 3 Extended Site Plan <br /> Figure 4 Potentiometric Map (A-Zone)— First Quarter 2013 <br /> Figure 5 Potentiometric Map (B-Zone)— First Quarter 2013 <br /> Figure 6 Potentiometric Map (C-Zone)— First Quarter 2013 <br /> Figure 7 Groundwater Concentration Map (A-Zone) — First Quarter 2013 <br /> Figure 8 Groundwater Concentration Map (B-Zone)— First Quarter 2013 <br /> Figure 9 Groundwater Concentration Map (C-Zone)— First Quarter 2013 <br /> LIST OF TABLES <br /> Table 1 —Current Groundwater Monitoring and Analytical Data <br /> Table 2— Historical Groundwater Monitoring and Analytical Data <br /> Table 3—Groundwater Flow Direction and Hydraulic Gradient Data—A-Zone <br /> Table 4—Groundwater Flow Direction and Hydraulic Gradient Data— B-Zone <br /> Table 5—Groundwater Flow Direction and Hydraulic Gradient Data—C-Zone <br /> Table 6—Well Construction Details <br /> LIST OF APPENDICES <br /> Appendix A— Previous Investigations and Site History <br /> Appendix B— Groundwater Monitoring and Sampling Field Data Sheets <br /> Appendix C— Certified Laboratory Analytical Report and Chain-of-Custody Documentation <br /> Appendix D— Groundwater Monitoring Data for Nearby Former Shell Service Station <br /> i <br />