SITE INFORMATION AND CORRESPONDENCE

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.s i The UST system that was installed during 1995 is state of the art equipment and meets all federal UST requirements. To my knowledge,there has not been.any indication or alarm signaling the release of motor fuels from the new UST system.In addition, results of soil sampling performed at the excavation limits of the new UST complex revealed no significant source of hydrocarbons. Therefore, it is assumed that the request from your agency to assess groundwater conditions west of the UST complexes must be focusing on possible fuel releases from the former UST complex. In response to that I would point out the soil sample results obtained at 21.0 and 31.0 feet below grade from borings B-1,B-2,and B-3 which were drilled by Pacific during January, 1996.These samples were collected from within the current capillary fringe and saturated zones.There were no contaminants(or odors)detected in soil at these depths. If there were appreciable groundwater contamination migrating west from this possible source area, these samples would have identified it. Since they did not, it is reasonable to believe that there is no appreciable source of groundwater contamination in this area of the site. In addition,these data preclude the need to investigate any further west.. Considering the above information, Chevron feels that further assessment at the subject site is unwarranted. Instead,I would reiterate our previous request for case closure. Your reconsideration of this request is greatly appreciated. If you have any questions or continents, please contact me at (510) 842-8695. Sincerely, Brett L. Hunter Environmental Engineer Site Assessment and Remediation Attachment i i cc: Margaret Lagorio, San Joaquin County Public Health Services, 304 E. Weber Ave.. 3"'Floor, Stockton, CA 95202 - - Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA Sanwa Trust and Investment,Trustee For The Gwendolyn Schaffer Trust, 4400 MacArthur Blvd. Suite 240,Newport Beach, CA 92660 r