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100 Pine Street. 1 Oth Floor <br /> San Francisco, CA 94111 GEOMATRIX <br /> C4151 434-9400 • FAX (4151 434-1365 <br /> 1 April 1998 V V `� <br /> p P,l l2 <br /> Project 4097 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Well Destruction <br /> Hanson Property <br /> Tracy, California <br /> Dear Mr. Infurna: <br /> On behalf of Chevron Pipe Line Company(CPL), Geomatrix Consultants, Inc. (Geomatrix), over- <br /> saw the destruction of groundwater monitoring well TW-1 at the subject site on 31 October 1997. <br /> The destruction was performed by Gregg Drilling and Testing, Inc. under a permit from your <br /> office. <br /> Destruction was accomplished by overdrilling the casing and annular fill materials,pulling the <br /> casing from the ground, filling the boreholes to within 3 feet of the ground surface with bentonite <br /> chips, hydrating the bentonite, and filling the upper 3 feet of the borehole with native soil. These <br /> well destruction procedures, as described in the Geomatrix Well Destruction Plan,dated <br /> 24 October 1997 (attached),were authorized by your office prior to destroying the well. <br /> Please call me if you have any questions. <br /> Sincerely, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Aartin B. Bloes <br /> r Scientist <br /> MBs/pp <br /> I:\WPDocs\4097\DESTR-LT.DOC <br /> Attachment <br /> cc: Katie Hower-Chevron Pipe Line Company <br /> Wendy Cohen-California Regional Water Quality Control Board, Central Valley Region <br /> Geomatrix Consultants, Inc. <br /> Engineers, Geologists, and Environmental Scientists <br />