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�zU0E <br /> June 2, 2009 EN 1RONMNTAL <br /> Harlin'Knoll: ,: <br /> San Joaquin County Environmental Health Dept.: m8"ETE D ' <br /> 600 East Main Street <br /> Stockton, CA 95202 JU.N 0 4 20.09" <br /> RE: Monitoring Well Destruction Report, SJCEHD ase No. .194$ EWIIF�O�II��Ef�T NEALTH <br /> PERMIT/SOV ICES <br /> Tesoro Site#67080,.2448 Kettleman Road, Lod' California <br /> Dear.Mr. Knoll: <br /> This letter report is subm_ itted.to document monitoring ell destruction activities performed at <br /> the Tesoro Site#67080 (former Beacon.Station#3696) 2448 Kettleman Lane in Lodi,.California i <br /> (Figure 1). Site monitoring'wells MW-1, MW-2 and W-3 were decommissioned in accordance <br /> with No Further Action,concurrence presented in the M ay 5, 2009 letter from the RWQCB- <br /> Central Valley Region to San Joaquin County.Environ ental Health Department(SJCEHD). A <br /> description of well destruction'activities is provided be ow: <br /> WELL DESTRUCTION SUMMARY <br /> Monitoring wells MW-1, MW-2 and MW-3 weredeco missioned using the methods and . <br /> procedures described in Azure's Monitoring Well Dest;uction Workplan and Permit Application, <br /> dated May 6, 2009: 'A copy of well destruction permit 0057279'issued by.SJCEHD ori May 11, <br /> 2009 is attached to'this report.,.Well Destruction Comf letion'Reports were submitted to the <br /> California Department of Water Resources.(DWR). <br /> Well.destruction activities-were conducted on May 26, 2009 by Gregg Drilling, Inc., a C57. . <br /> licensed drilling contractor. Each well was sounded prior to well,destruction-to confirm the total <br /> depth'of the well and to check for any downhole ob_ stru ctions: Well sounding data are <br /> summarized below: <br /> Well No. .- Depth to Ground Wad Well Depth <br /> feet b s feet b s <br /> MW-1 48.91' 55.75 <br /> MW-2 50.00 : 59.00 <br /> MW-3 49.42 59.25 <br /> The wells were destroyed by the pressure,groiit method., Each well was grouted using 94-pound <br /> sack Portland cement mixed with approximately 5- to -gallons of water. After filling each well <br /> with neat cement grout by pumping through the top of he well casing, the well was sealed and." <br /> additional grout was pumped into the well under•press re. .The sealed well was held under <br /> pressure for more.than approximately.five minutes to force grout through the screen interval and <br /> adjacent,sandpack materials and effectively seal the en ire,depth of well casing. Approximately <br /> 15-to 18-gallons of cement grout was used to pressure fill each�well. <br /> 769 Center Boulevard, #123;,Fairfax,CA 94930'f 415/488-1738 Fax-4151488-1708 <br />