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*� y. , <br /> S I . <br /> PUBLTC HEALTH SER ICES <br /> SAN JOAQUIN COUNTY " <br /> JOGI KHANNA RD.,M.P.H, <br /> Health Officer �P . <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 4C1 Foq� <br /> (209) 468-3400 <br /> December 27, 1990 <br /> Deborah Harris n Fly Exxon Company, U.S.A. v <br /> P.O. Box 4415 <br /> Houston, Texas 77210-4415 <br /> RE: Exxon Station <br /> 574 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 UGST precision test had occurred at the former <br /> Mobil Service Station #10-NP4 at 2375 N. Tracy Blvd. , Tracy, <br /> California. Subsequently, all UGSTs were removed and soil and <br /> groundwater sampled. Analysis of these samples documented both <br /> 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-mingled: 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 the Exxon Station at 574 W. Grant Line Road, Tracy, <br /> California, to this office, by February 1, 1991. <br /> A Division of San Joaquin County Health Care Services <br />