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s DEC 10 '97 11 27AM CLERRWATER GROUP P 214 <br /> —�, b -- <br /> k.;.-LEARWkTER <br /> • _ c R (7) 11 1 , I N t� <br /> hnvirgnrnenta! sertycies <br /> December5, 1991 <br /> Mr. Harlan Knoll <br /> San Joaquin County PUSIEHD <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 moll, <br /> This letter wO*plau fox well abAndonrnent as Written In anticipation of a favorable response by the <br /> Regional Board and SIC PHSAEHD 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 1 'vapor <br /> extraction well, the final stage of site work required at this site <br /> Scone of Word <br /> As specified above Clearwater intends to abandon 5 groundwater monitoring wells and 1 vapor <br /> extraction well. The monitoring wells are 2 inches an diameter and are between 40 - 42 feet in <br /> depth The vapor well is also 2 mcbes in daametm and 28 5 feet in depth. The well abandonment <br /> work will be ger€orrr>ed in accordance with state and county well abandonment and destruction <br /> procedures. Clearwater proposes to pressure grout these wells using a hollow stem augur drill rag <br /> and compressor system. .A►bentowte grout seal wall be infected into the well to approximately 5 <br /> feet below grade The well casing from 5 feet below grade to the surface wall be removed by <br /> overdralltng and filled to approximately b" to 12" below grade with the bentonite grout The <br /> borehole will be f-imshed with concrete to grade <br /> &Darting, <br /> The well abandonment work sW be documented in a letter report to your office The report shall <br /> contain a write up of the work performed and wall describe abandonment methods and seals used. <br />• <br /> 1120 Tlmrd Street,Sure 104 o Oakland,C7lifnrnxa 94607 8 Te1&phjme 51"%,4-5160 o Fax 5x0-893-5947 <br />