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4 �� Cardno® <br /> January 17,2014 ATC <br /> Eggiman Well Destruction Report <br /> .Shaping the Future <br /> The grout was brought to grade and the area surrounding.the well box was resurfaced to match the.surrounding <br /> surface completion. <br /> Wells Abandoned by Pressure Grouting <br /> Groundwater monitoring wells MW8 and MW11 were destroyed by pressure grouting. This process began with <br /> removal of the well box and locking plug and advancingra 24-inch diameter borehole to a:depth of approximately 36 <br /> inches around the well casing using.an.air knife. The well casing was.cut off 30.inches_below grade and removed. : <br /> Then a specialized pressure-grouting tool was affixed to the well casing to deliver and emplace a neat cement grout <br /> slurry under pressure into the well until the slurry was injected into the sand filter pack and filled the remaining <br /> - casing. When the grout extended to the top of the well casing,sair-pressure of 25 PSI was applied to the well•I <br /> casing for approximately five minutes: Additional grout was then poured into the top of the well casing as was <br /> necessary. Following the.pressure procedure, additional grout was,made to overflow into the excavation and form a <br /> minimum 24-inch diameter"mushroom cap" like seal, with at least 12 inches of neat cement grout poured 6 inches <br /> `above and 6 inches below the top of the cut-off casing'Any-remaining soil-voids were backfilled compacted and_ .,_--_-_,y <br /> resurfaced to match the surrounding.surface completion. a <br /> Well Completion/Destruction Reports <br /> In accordance with California State Law, WellPompletion/Destruction Reports of the destroyed wells have been <br /> prepared and submitted to the EHD by Cascade Drilling.,Due.to;regarding the-confidential,natu re of welf.data,:the <br /> information:submitted.to.the,DWR:is.not_attachedto-this.report. <br /> Investigative Derived Waste Disposal <br /> The removed well boxes, sand pack and grout were placed in roll off bins and drums and the groundwater that was <br /> displaced to the surface during grout emplacement was pumped out of the excavation, collected, placed into DOT <br /> approved drums until profiling was complete. <br /> The wastes were removed by American Integrated Services, Inc. of Fairfield, California in November 2013 and <br /> disposed at the Recology Hay Road Landfill in Vacaville, California and Crosby &Overton, Inc. in Long Beach, <br /> California. Manifests associated with the roll-off bin and drums are included in Attachment 1. <br /> www.cardnozitc.com <br />