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ARCADIS Mr. Steven W. Meeks <br /> October 6, 2011 <br /> a"mushroom cap" of neat cement above the casing to seal the borehole. Native soil <br /> will be used to backfill the excavation to natural grade. <br /> Well Destruction by Over-Drilling <br /> The remaining 30 wells (see Table 1) located in areas of known groundwater <br /> contamination will be destroyed by removing the casing and sand pack material within <br /> the original borehole in accordance with SJCEHD's Well Standards Sub-Section <br /> 13.17.6. The material will be removed by over-drilling the borehole with an auger <br /> casing larger than the original borehole. The over-drilled boring will be filled completely <br /> with neat cement grout pumped into the borehole via a tremie pipe placed near the <br /> bottom of the borehole. <br /> Investigation Derived Waste <br /> Investigation derived waste such as waste water or soil will be placed temporarily on <br /> site in properly labeled Department of Transportation approved 55-gallon drums or <br /> roll-off bins. The waste water and/or soil will be characterized then transported off site <br /> for disposal by a licensed waste hauler. Sanitary waste will be disposed of in an <br /> appropriate sanitary waste receptacle. <br /> Reporting and Schedule <br /> A brief summary letter will be prepared and submitted to the RWQCB and SJCEHD <br /> after completing the well destruction activities. The letter will include a summary of the <br /> conducted field activities and copies of well destruction logs. <br /> ARCADIS will begin coordinating well destruction activities following approval of this <br /> work plan by the RWQCB. Approval of this work plan is required to obtain the well <br /> destruction permits from the SJCEHD. The field effort associated with destroying the <br /> wells is anticipated to take approximately 20 to 25 working days. <br /> Page: <br /> tracy ca_maint facil_well dest wp(10-06-11).doc 4/5 <br />