SITE INFORMATION AND CORRESPONDENCE

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, I 100 Pine Street, 10th Floor San Francisco, CA 94111 (41 5) 434-9400 • FAX (415) 434-1365 GEOMATRIX 11 September 1998 Project 3958.04 Page 1 of 2 Mr. Mike Infurm San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, 3rd Floor Stockton, California 95202 Subject: Well Destruction Work Plan _ Corral Hollow and Grant Line Roads Site Tracy, California Dear Mr. Infurrna: The Regional Water Quality Control Board, Central Valley Region (RWQCB)'approved closure of 15 extraction and monitoring wells at Chevron Pipe Line Company's(CPL), Corral Hollow and Grant Line Roads site (the Site) in Tracy, California. CPL intends to begin destroying these 15 wells beginning 22 September with work completing around 25 September 1998. The wells will be destroyedin accordance with San Joaquin County standards, and under permits from your office and the City of Tracy (encroachment.permit). Destruction will be accomplished by overdrilling the casing and annular fill materials,pulling the casing from the ground, and filling the boreholes with cement grout to within 3 feet of the surface. The upper 3 feet of each borehole will be filled with soil. Enclosed with the'letter are: • two completed application forms for destruction of wells • a check for$120 ($60 per application) • well location map • 23 July 1998 Letter from CPL to the RWQCB • Letter confirming approval for well abandonment dated 11 September.1998 • .A copy of the City of Tracy Encroachment permit dated 1 September 1998 Work is scheduled to occur from-22 September to 25 September 1998.We look forward to your approval of this work plan and the well destruction permits at your earliest opportunity. We are Geomatrix Consultants, Inc. Engineers,Geologists,and Environmental Scientists