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Well Destruction Groundwater monitoring wells MW-1 through MW-5 were over-drilled with eight Method: (8) inch diameter hollow stem auger drilling equipment. Over drilling of the monitoring well was accomplished by centering the drill rig tooling directly over the center of the monitoring well casing, using a special guide tool that also grinds up the well casing, maintaining a level and consistent drilling out of the existing well annular space, and then confirming that the well construction materials were present in the drill cuttings. The well caps and locks were removed from each well prior to the over drilling. The borehole was measured to ensure total depth had been achieved and then neat cement grout was tremied through the drill augers from the bottom of the borehole to approximately 3 feet below ground surface. Native material from the site was used to backfill the remaining void in the borehole to the surface. Grout volumes and materials used to complete the well destructions are summarized in the Table below: RvuT Well ID Cement(bags) Bentonite PDut-Volume bas allons MW-1 34 1/2 310 MW-2 31 1/2 310 MW-3 28 1/2 280 MW-4 24 1/2 240 MW-5 31 1/2 300 Waste Disposal: Drill cuttings that contained ground up PVC well casing generated from the November 2013 well destruction activities were placed in a covered roll off soils bin. The bin was locked and secured each night and until delivery to the landfill for disposal. Representative soil samples were collected for the purpose to characterize the waste for acceptance with a local landfill. Analytical results are presented in Appendix C. On November 21, 2013, the soils bin was picked up by Belshire Environmental Services, Inc. (Belshire)for transportation and disposal at Potrero Hills Landfill, located in Suisun, California. The soils bin was transported under an executed Bill of Lading/Manifest(for soils). Disposal location is documented on the manifest and is included with the analytical report in Appendix B. No groundwater was generated during these well destruction activities. GEOTRACKER DATA ENTRY AND DWR FORMS Required documents have been uploaded into the GeoTracker database. GHD will also upload a PDF copy of this report to the GeoTracker database upon completion. A State Department of Water Resources (DWR) Form 188, Well Completion Reports, have been completed and submitted to the appropriate agencies for the destroyed wells. A copy of the completed DWR 188 Forms with soil boring logs are presented in Appendix D. SUMMARY • Five groundwater monitoring wells(MW-1 through MW-5) have been destroyed by over-drilling; • Waste generated from the well destruction activities have been off-hauled and disposed of at Potrero Hill Landfill by Belshire a licensed hazardous waste company; 03009-10016 Blue Star 2 of 3 December 2013