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;. <br /> Ultramar , <br /> Ultramar Inc. PY� <br /> P.O.box 466 Teleco 209-585-5685 Credit <br /> 525 W.Third Street 209-583-3330 Administrative <br /> Hanford,CA 93232-0466 209-583-3302 Information Services <br /> (209)582-0241 209-583-3358 Accounting <br /> � m � <br /> JAN 0'5 1998 <br /> DATE REPORT SUBMITTED: December 29, ,1997. ENVIRONMENTAL HEALTH <br /> QUARTER ENDING: December'31, 1997 PERMIT/SERVICES <br /> SERVICE STATION NO.: 474 <br /> ADDRESS: 3440 East Main Avenue,.Stockton.CA <br /> COUNTY: San Joaquin <br /> ULTRAMAR CONTACT: Kenneth R. Earnest. TEL. NO: 209-583-3271 <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. <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 aver- <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 yells 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 /> SUMMARY OF THIS QUARTER'S ACTIVITIES: <br /> Ground-water sampling of all the wells was conducted "by Doulos Environmental on <br /> November 21, 1997. <br /> BEACON <br /> A Member of the Ultramar Group of Companies #1 Quality And Service <br /> Wtramar <br />