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Mr. James L.L. Barton, P.G. December 30, 2015 Page 3 of 4 To destroy MW-7 and MW-8 by the pressure grout and mushroom cap method, V&W filled the wells from the bottom with neat cement grout using a tremie pipe, and then applied 25 pounds per square inch(psi) of pressure for ten minutes on each of the cement-filled wells. Following the pressure grouting, V&W expanded the diameters of the upper three feet of the well borings to 24- inches using a surface drill bit (i.e., cookie cutter), to install the mushroom caps. For the mushroom caps, V&W cut-off and removed the well casings six-inches above the bottoms of the excavations (i.e., 2.5 feet below surface grade). V&W then continuously poured neat cement into the excavations to create a"cap" with a vertical thickness of one foot(between two and three feet below surface grade). Finally, V&W completed the upper two feet of the boreholes with compacted soil and surface patches matching the surrounding material. Waste Management and Disposal V&W contained the waste well materials and soil in a 10 yard roll-off bin for temporary on-site storage, pending waste characterization and proper disposition. On November 18, 2015, to characterize the waste, Ramage Environmental collected four representative soil samples from the waste soil bin for laboratory analysis. Ramage Environmental transported the soil samples with chain of-custody documentation to Excelchem Environmental Labs (Excelchem), a state of California certified hazardous waste testing laboratory (Certification #2119). Excelchem combined the four soil samples into one, and analyzed the composite sample for Total Petroleum Hydrocarbons (TPH)-as-jet fuel, TPH-as-diesel, TPH-as- gasoline, benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8021B/8015M, and for total lead by EPA Method 6010B. The analytical results indicated that the waste soil did not contain concentrations of TPH-as jet fuel, TPH-as-diesel, TPH-as-gasoline and BTEX above laboratory reporting limits, and that the concentration of total lead of 3.2 milligrams per kilogram (mg/kg) was representative of natural background conditions, and well below hazardous waste thresholds. The laboratory reports are attached. Based on the composite soil sample analytical results, Republic Services profiled the waste soil as non-hazardous waste for disposal at Forward Landfill in Stockton, California, under Waste Profile #42041520309. On December 15, 2015, Republic Services transported the 6.68 tons of waste soil as non-hazardous waste to Forward Landfill for disposal. The non-hazardous waste manifest and landfill weight ticket are attached. No other investigation-derived waste remains at the site.