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CLEARWATER <br /> t, I: () U P, INC <br /> Entirrrinarcrtlal Sertiitta <br /> December l2, 1947 <br /> Mr Harlan Knoll <br /> San Joaquin County PHS/EHD <br /> PO Box 388 <br /> Stockton, CA 95201-0388 <br /> Re Workplan for Well Abandonment <br /> 4555 North Pershing Ave Stockton CA <br /> Dear Mr Knoll, <br /> This letter workplan for well abandonment is written in anticipation of a favorable response by the <br /> Regional Board and SJC PHS/EHD of our recent petition for closure of the referenced site This <br /> workplan describes the work required to destroy and abandon 5 monitoring wells and I vapor <br /> extraction well,the final stage of site work required at this site <br /> Scops of Work <br /> As specified above Clearwater intends to abandon 5 groundwater monitoring wells and I vapor <br /> extraction well The monitoring wells are 2 inches to diameter and are between 40 - 42 feet 1n <br /> depth The vapor well is also 2 inches in diameter and 28 5 feet in depth The well abandonment <br /> work will be performed in accordance with state and county well abandonment and destruction <br /> procedures Clearwater proposes to pressure grout these wells using a hollow stem auger drill rig <br /> and compressor system A bentonite grout seal will be infected into the well to approximately 5 <br /> feet below grade using a tremie system The well casing from 5 feet below grade to the surface <br /> will be removed by oveldrilling and filled to approximately 6" to 12" below grade with the <br /> bentonite grout The borehole will be finished with concrete to grade <br /> Renard= <br /> The well abandonment work shall be documented in a letter report to your office The report shall <br /> contain a write up of the work performed and will describe abandonment methods and seals used <br /> Once documentation of proper well abandonment is provided to your office Clearwater and our <br /> client would appreciate your timely response and final closure documentation <br /> 520 Third Stieet Suite 104 + Oakland CalifomLa 94507 • Tcfepl-,one 51(1-893.5160 • Fax 510-893-5947 <br /> b it d dnoa5 631HMdU3-3 WUEV TT L6. eT D3Q <br />