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83 WEST MARCH LANE <br /> SUITE 12 <br /> STOCKTON,CA 95207 <br /> PHONE:(209)476-1635 <br /> MANAGERS OESIGNERSMWULTANTS July 18 , 1989 <br /> Mr. Richard Callistro <br /> Capital Project Division <br /> San Joaquin County <br /> 222 E. Weber Ave. <br /> Courthouse, Room 670 <br /> Stockton, CA 95202 <br /> Dear Mr. Callistro, <br /> At the request of the San Joaquin County Captial Project <br /> Division, ROY F. WESTON, INC. (WESTON) will abandon monitor well <br /> MW-1 by removal or destruction. The resultant borehole will be <br /> filled with grout. The abandonment of MW-1 is necessary because <br /> as presently located the well interferes with the planned <br /> construction of the new Human Services Building for San Joaquin <br /> County at this site. Figure 1 and Figure 2 depict the site and <br /> monitor well location. <br /> The actual abandonment will be accomplished in one of two ways. <br /> 1. Initially, an attempt will be made to remove the PVC casing <br /> intact by pulling it from the ground. If the casing can <br /> indeed be pulled intact from the ground, the hole will then <br /> be grouted from the bottom up using a 5% bentonite cement <br /> grout pumped into place through a trim line. <br /> 2 . If the PVC casing cannot be removed intact, the well will be <br /> drilled out using a 10 inch hollow stem auger. This <br /> drilling procedure will completely destroy the PVC well <br /> casing. A set of AW rods will be placed within the well <br /> casing and will act as a centralizer thus ensuring that the <br /> destruction is complete and that the drill hole does not <br /> deviate from the well . The borehole will be grouted as <br /> described above, using a 5% bentonite cement grout pumped <br /> into place through a trim line. Grout placement will be <br /> done under the supervision of a San Joaquin County <br /> Environmental Health Inspector. <br /> Sincerely, <br /> ROY F. WESTON, INC. <br /> Jeffrey F. Herrick <br /> Associate Geologist <br /> JFH/akw <br />