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PARSONS ENGINEERING SCIENCE, INC. r �r <br /> 290 Elwood Davis Road,Suite 312•Liverpool, New York 13088•(315)451-958q.•;F <br /> ��UPI 23 AN 10: 53 <br /> June 18, 1997 <br /> Mr. Michael Infurna, Jr. <br /> Senior REHS <br /> LOP/Site Mitigation Unit N <br /> Public Health Services - San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE: Greyhound Terminal <br /> Stockton, California <br /> Location 8969 <br /> Monitoring Well Abandonment <br /> Dear Mr. Infurna: <br /> Parsons Engineering Science, Inc. (Parsons ES), on behalf of Greyhound Lines, Inc. <br /> (Greyhound), is pleased to provide the Public Health Service-Environmental Health <br /> Division of San Joaquin County (PHS-EHD) with this work plan detailing procedures, <br /> materials and schedule for abandoning four monitoring wells at the Greyhound Terminal in <br /> Stockton, California. This work plan has been prepared as required in your letter of <br /> June 3, 1997 from PHS-EHD. The following scope of work has been prepared to meet the <br /> well abandonment requirements of the PHS-EHD. <br /> SCOPE OF WORK <br /> In accordance with PHS-EHD requirements, Parsons ES will abandon three 4-inch <br /> diameter monitoring wells and one two-inch diameter monitoring well located at the <br /> Greyhound facility in Stockton. Each monitoring well is 55 feet in depth and will be <br /> abandoned by pressure grouting with a cement/bentonite slurry. <br /> As required by PHS-EHD, the upper three feet of the well borehole will be enlarged by <br /> overdrilling to one foot diameter beyond the originally-drilled hole. The PVC well casing <br /> will then be cut off at a depth of 2.5 feet below grade. The well will then be pressure <br /> grouted from the bottom of the well using a tremie pipe. The cement/bentonite slurry will <br /> be permitted to spill out over the well to form a one foot thick cap above the well pipe. <br /> The annulus above the cap will be filled with clean soil or cement/bentonite grout to within <br /> six inches of grade. A six-inch thick asphalt or concrete cap will then be placed over the <br /> grouted borehole to restore the paved surface to its original condition. All cuttings and <br /> excavated well materials will be stored in Department of Transportation-approved 55-gallon <br /> drums and staged on-site for future disposal by Greyhound. <br /> FARFSSYR011VOL1:W A730844189691\89691 L05.DOC <br /> PARSONS <br />