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R <br /> 1 <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY N <br /> JOGI KHANNA M.D.,M.P.H. X <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) Stockton,California 95201 <br /> c4�iFo'd*'`P <br /> (209) 468-3400 <br /> December 27, 1990 <br /> Clint Rogers <br /> Chevron U.S.A. , Inc. C,(Opy <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583 <br /> Ria: Chevron Station <br /> 575 W. Grant Line <br /> Tracy, CA <br /> On June 11, 1986, this office received an Underground Storage Tank <br /> (UGST) Unauthorized Release (Leak) Contamination Site Report which <br /> indicated a failed underground storage (UGST) tank precision test <br /> had occurred at the former Mobil Service Station #10-NP4, 2375 <br /> Tracy Blvd. , Tracy, California. Subsequently, all UGSTs were <br /> removed and soil and groundwater sampled. Analysis of these <br /> samples documented both soil and groundwater contamination. <br /> The Mobil Oil Corporation then began a site assessment in order to <br /> determine the full extent of soil and groundwater contamination <br /> associated with the facility. A number of borings and groundwater <br /> monitoring wells have been completed both on-site and off-site but <br /> zero lines have never been defined. <br /> In a report prepared by Mobil 's consultant, Alton Geoscience, Inc. , <br /> they stated, "Based on the hydrogeologic conditions in the area and <br /> results of the field activities and laboratory analysis, there are <br /> potentially three (3) hydrocarbon contaminant plumes in the <br /> vicinity of the site that have co-mingles: one on-site on the <br /> northeast corner of the former Mobil property; one adjacent to the <br /> Exxon property; and one adjacent to the Chevron property. <br /> In order to fully define the extent of groundwater contamination, <br /> this office is seeking the cooperation of the involved parties to <br /> characterize each contamination plume. Please submit a Preliminary <br /> Report (PR) for 575 W. Grant Line Road, to this office, by February <br /> 1, 1991. <br /> A Division of San Joaquin County Healhh Care Services <br />