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I <br />A ACTON • L I� <br />MICKELSON • <br />van DAM INC. <br />`XPi, p1j",2,qtis,ig Scientists, Engineers, and Geologists <br />April 8, 1994 <br />6 <br />Mr. Kenneth Earnest <br />Ultramar Inc. F <br />525 West Third Street <br />Hanford, CA 93230 19042.01X <br />Subject: Conductor Casing Installed During Underground Storage Tank Removal Activities <br />Beacon Cardlock Station No. 610 <br />3300 Waterloo Road, Stockton, California <br />Dear Mr. Earnest: k <br />This letter has been prepared to describe the installation of two conductor casings at the Beacon Cardlock <br />Station No. 610 (site) located at 3300 Waterloo Road, Stockton, California (Figures 1 and 2). Two <br />conductor casings were installed at the site within the former tank basin (Figures 2 and 3) during backfill <br />activities associated with underground storage tank removals. ��hree' underground storage tanks were <br />removed from the site on October 14, 1994. After soil had been overexcavated to a depth of <br />approximately 33 feet below grade on October 18, 1994, two 24L inch diameter, solid polyvinyl chloride <br />(PVC) casings were suspended from an excavator and lowered until one! end of each casing was in contact <br />with the bottom of the excavation. Approximately 1 foot of native soil was implaced around the bottom <br />of each conductor casing. Backfill operations of the tank basin excavation then continued normally with <br />pea gravel to grade around the two conductor casings. A traffic -rated, 30 -inch diameter well box was <br />installed with an approximate two -foot surface seal of concrete after backfill operations were completed. <br />If you have any questions regarding the installation of the conductor casings, please contact either of the <br />undersigned at (916) 939-7550. <br />.r <br />Sincerely, <br />ACTON • MICKELSON • wan DAM, INC. ' <br />I/DvD:maf <br />e to Dale A. van Dam, R.G. <br />logist Vice President <br />i <br />Enclosures <br />i <br />. .t ISf2D'L.jfm <br />l <br />4511 Golden Foothill Parkway, Suite 1 k <br />(916)939-7550 <br />El Dorado Hills, California 95762 I� Fax (916) 939-7570 <br />I ;� <br />