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TABLE OF CONTENTS INTRODUCTION... ..... .... . .... .... ..... ........... ........ .............. ...............1 Background 1 Wards Site Unocal Site 2 Robinhood Irrigation Well (RIW) 2 Cleanup and Abatement Order 3 FIELDINVESTIGATION...... .. . ..... . ...... ..... .... ...... ...... . ..... .... ....... ........................................3 Groundwater Sampling 3 ANALYTICALTESTING ... . ... ..... ... . .... ..... .. . ... .............. .................................................4 DISCUSSION . . ..... . .... . .. ....... ............. .. .......... ................. ...... ......... ................................... Groundwater Elevation Contour Maps 4 Groundwater Flow Direction and Magnitude 4 Shallow and Deep Monitoring Well Hydrographs 5 TPH-G and Benzene Isoconcentration Maps 5 Analytical Testing Results 5 Future Activities 5 LIMITATIONS..... ............... ... ........ ....... ................ ... . .. ........ ..... ...........................................5 • TABLES Table I Well Details Table I Groundwater Monitoring Data and Analytical Results Table 2 Groundwater Analytical Results—Oxygenate Compounds Table 3 Groundwater Analytical Results FIGURES Figure 1 Vicinity Map Figure 2 Extended Site Plan Figure 3 Shallow Groundwater Elevation Map Figure 4 Deep Groundwater Elevation Map Figure 5 Well Construction Details Figure 6 Groundwater Flow Direction and Gradient Diagram Figure 7 Shallow Well Hydrograph Figure 8 Deep Well Hydrograph Figure 9 Shallow Zone TPHG Isoconcentration Map Figure 10 Deep Zone TPHG Isoconcentration Map Shaul.,. ?one Benzene isoconcantration Map Figure 1111 S11 IIV.+ Figure 12 Deep Zone Benzene Isoconcentration Map APPENDICES Appendix A Standard Operating Procedure--Groundwater Sampling Appendix B Field Data Sheets, Chain-of-Custody Records, and Analytical Reports