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Ultramar <br /> Ultramar,Inc. Telecopy: 209-585-5685 Credit <br /> P.O.Box 486 209-583-3330 Administrative <br /> 525 W.Third Street 209-583-3302 Information Services <br /> Hanford,CA 93232-0466 209-583-3358 Accounting <br /> (209)582-0241 <br /> w y » » <br /> DATE REPORT SUBMITTED: July 21, 1997 <br /> QUARTER ENDING: June 30, 1997 <br /> JUL 3 0 1997 <br /> SERVICE STATION NO.: 474 <br /> ADDRESS: 3440 East Main Avenue, Stockton CA ENVIRONMENTAL HEALTH <br /> COUNTY: San Joaquin <br /> PERMIT/SERVICES <br /> ULTRAMAR CONTACT: Kenneth R. Earnest TEL. NO: 209-583-5571 <br /> BACKGROUND: <br /> In March, 1991, a limited soil investigation was conducted at the site as part of a divestment <br /> project. Analytical results of selected soil samples collected from borings drilled during the <br /> investigation indicated the presence of trace levels of gasoline hydrocarbons beneath the site. ri <br /> Removal of the three existing UST's was performed in September 16, 1993. Analytical <br /> results of soil samples collected from the tank basin and the fuel islands indicated the presence <br /> of trace levels of gasoline range hydrocarbons in these areas. The tank basin was over- <br /> excavated to a depth of 30 feet in an effort to remove the impacted soil- The highest benzene <br /> in the samples collected from 30 feet was 0.12 ppm with no detection of TPHg. <br /> Based on the analytical results from the drilling and the UST removal, San Joaquin Co. <br /> Environmental Health required that Ultramar install three ground-water monitoring wells at <br /> the site to assess ground-water conditions beneath the site. These wells were installed in <br /> December, 1993. Analytical results of water samples collected from the wells indicate that <br /> ground water beneath the site is impacted with gasoline hydrocarbons. Quarterly monitoring <br /> of the wells was initiated in the first quarter of 1994. <br /> Two more up-gradient groundwater monitoring wells (MW-4 and MW-5) were installed <br /> during the third quarter 1996 <br /> SInMARY OF THIS QUARTER'S ACTIVITIES: <br /> Ground-water sampling of all the wells was conducted by Doulos Environmental on June 13y1_X <br /> 1997. <br /> BEACON <br /> #1 Quality and Service <br /> A Member of the Ultramar Group of Companies <br /> U . mar <br />