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AZURE May 6,2009 ENV]RONMENTAL - Harlin Knoll San Joaquin County Environmental Health Dept.' 600 East Main Street . Stockton,CA 95202 RE: Monitoring Well Destruction Workplan and-Permit Appli ation, SJCEHD Case No. 1948 . Tesoro Site#67080,2448 Kcttleman Road,Lodi,Califoniia Dear Mr.Knoll: This Monitoring Well Destruction Workplan(Workplan)and enclosed well destruction application and permit fee ($60)are submitted on behalf of Tesoro Environmental Resource Company(Tesoro)for.the Tesoro Site#67080 (former Beacon Station#3696)at 2448 Kettleman Road in Lodi,. alifoinia. The well destruction is planned in accordance with'No Further Action concurrence in the May 5,-200) letter from the RWQCB=Central Valley Region _to San Joaquin County Environmental.Health Department(SJCEH ). F,y The wells planned for destruction are wells MW-1,MW-2,and M -3 located on the service.station property. A site map and well boring diagrams are attached. The wells are propose d to be destroyed using the pressure grouting method by Gregg Drilling,Inc.,a,licensed drilling contractor: Nez t cement grout will be pumped into the well casing under pressure greater than 25 psi and held for more than fi e minutes to force grout through the screen interval and adjacent sandpack materials and effectively seal the entire depth of well casing and sandpack. The wells will be inspected and any obstruction removed,from the well casing prior to pressure grouting. After pressure grouting each well,the surface well'box will be removed. The top 3-feet of well borehole will be over drilled using 10-inch diameter augers,and approximately the top 2.5-feet of well casing will be removed. The bottom of the overdrill-borehole will be filled with approximately ne-foot of cement to establish a cement base and a 2.5-foot bgs"mushroom cap". The cap will be covered with clean fill and the ground surface at each well location will be restored to surface grade using replacement materials(i.e., asphalt or cement patch). Following completion of well destruction activities,Azure-will submit a report documenting completion of such activities to the SJCEHD. The report will include descriptions ofhe methods and procedures used to destroy the wells. In addition,DWR well destruction completion forms will b- submitted to the SJCEHD and the California Department of Water Resources. The SJCEHD will be notified prior to conducting the well destruction work. Please feel free to call rrie at 4151488-1738 if you have any questions. Sincerely, . . �pNAL CE�Z ri'- -,r•. �. - .. ...._. .. ...- w O� ��lt�'..�f� O/1 ..r y. rwwa...a�+.F'�" �r-� - w w•+ « .- ..`.e- ,r. .Y- * No 4605 Jeff Hennier,PG,CHg. �rFOF CA��F� Principal Hydrogeologist cc w/o attachments: Jeff Baker,Tesoro Chuck Miller,USA Petroleum Brian Kelleher,Kelleher&Associates 769 Center Boulevard, #123,Fairfax; CA 94930 1 415/488-1738 Fax 415/4.88-1708 V