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' Updated Site Conceptual Model and First Quarter 2002 Monitoring and Remediation Report <br /> Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 <br /> TABLE OF CONTENTS <br /> Page <br /> 10 INTRODUCTION............ ......................................... . ............... .. ... .... ............. 1 <br />' 11 Background I <br /> 1 1 1 Wards Site I <br /> 1 1 2 Unocal Site I <br />' 1 1 3 Robinhood Irrigation Well (RIW) 2 <br /> 1 1 4 Cleanup and Abatement Order 3 <br /> 2.0 SITE CONCEPTUAL MODEL UPDATE ................ ........... ............. ........... ... 4 <br /> 3 0 GROUND WATER MONITORING................................... ................................. 6 <br />' 3 1 Ground Water Sampling 6 <br /> 3 2 Effluent Handling 6 <br /> 3 3 Analytical Testing 6 <br /> 4 0 REMEDIATION SYSTEM STATUS REPORT.............. .. ........................ .. 7 <br /> 41 Remediation System Restart—Montgomery Ward Site Only 7 <br />' 4 2 Trenching and Piping Installation on Unocal Site 7 <br /> 4 3 Joint Wards and Unocal Remediation System Start-Up 7 <br /> 4 4 Remediation Results 8 <br /> 4 5 Relocation of Remediation Compound 8 <br /> 5.0 DISCUSSION............. ... ............ ..... . . ............... ..... . .................... . ......... .. 9 <br />' 5 1 Ground Water Elevation Contour Maps 9 <br /> 5 2 Ground Water Flow Direction and Magnitude 9 <br /> 5 3 Monitoring Well Hydrographs 9 <br /> 5 4 TPH-G and Benzene Isoconcentration Maps 9 <br /> 5 5 Analytical Testing Results 10 <br /> 5 5 1 Units A and B Wells 10 <br /> 5 5 2 Units C and D Wells (MW-8D, MW-23S/D and MW-24S/D 10 <br /> 5 5 3 Well MW-9 and Other Perimeter Wells 10 <br /> 6 0 RECOMMENDATIONS .............. . . ..... ................................. . .. .......... ............ 11 <br /> 7.0 LIMITATION.................... ................................ . .. ... ........ ....... .. .................... 12 <br /> BHM 1212RO233 -t- <br /> ENVIRONMENTAL AUDIT, INC <br />