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100 Pine Street, 1 Oth Floor <br /> San Francisco, CA 94111 <br /> C4153 434-9400 • FAX C415] 434-1365 GEOMATRIX <br /> 12 January 1995 <br /> Project C2677 <br /> Mr. Don Culbertson <br /> Chevron Pipe Line Company <br /> 5080 California Avenue, Suite 400 <br /> Bakersfield, CA 93309 <br /> LSubject: Groundwater Monitoring Well Installation and Destruction Work Plan <br /> and Evaluation of Site Characterization <br /> ' Dividend Property, Tracy, California <br /> Dear Mr. Culbertson: <br /> This work plan has been prepared b Geomatrix Consultants, Inc. Geomatrix on behalf of <br /> P P P Y (Geomatrix) <br /> Chevron Pipe Line Company (CPL) and Texaco Trading and Transportation, Inc. (TI'TI). <br /> This work plan presents monitoring well destruction and installation procedures; it also <br /> presents an evaluation of the lateral and vertical extent of petroleum hydrocarbons in soil and <br /> groundwater at the subject site with respect to the current and proposed locations of the site <br /> groundwater monitoring wells. This work plan was requested by California Regional Water <br /> Quality Control Board, Central Valley Region (RWQCB-CV) in a letter to CPL dated 1 <br /> December 1994 and during discussions held during a meeting among representatives of <br /> RWQCB-CV, CPL, TTTI and Geomatrix on 14 December 1994. The field procedures and <br /> an evaluation of site characterization are presented below. Well destruction and installation <br /> will be performed under the direction of a California Certified Engineering Geologist. <br /> Required permits will be obtained,by Geomatrix on behalf of CPL prior to beginning field <br /> work. <br /> WELL DESTRUCTION <br /> A total of seven site monitoring wells (MW-2, MW-3, MW-4, MW-7, MW-8, M)NI-11, and <br /> MW-12) are damaged to an extent that makes them unsuitable for groundwater monitoring. <br /> The subject monitoring wells will be destroyed using the following procedure in accordance <br /> with Geomatrix protocols (Appendix A). Using a hollow-stem auger drill rig equipped with <br /> 8-inch diameter augers, well casing and annular fill materials will be drilled out at each well <br /> to the total depth of the well. The resulting borehole will subsequently be grouted from the <br /> bottom up with neat cement. <br /> Geomatrix Consultants, Inc. <br /> Engineers,Geologists,and Environmental Scientists <br />