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Ultramar <br /> Ultramar,Inc. Telecopy: 209-585-5685 Credit <br /> P0.Box 466 209-583.3330 Administrative <br /> 525 W.Third Street 209-583.3302 Information Services <br /> Hanford,CA 93232-0466 209.583.3358 Accounting <br /> t (209)582-0241 <br /> DATE REPORT SUBMITTED: August 3, 1999 <br /> QUARTER ENDING: June 30, 1999 <br /> FORMER SERVICE STATION NO.: 474 <br /> ADDRESS: 3440 East Main Avenue, Stockton CA <br /> COUNTY: San Joaquin <br /> ULTRAMAR CONTACT: Joseph A. Aldridge TEL. NO: 559-583-3231 <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 over- <br /> excavated to a depth of 30 feet in an effort to remove the impacted soil. The highest benzene <br /> concentration detected was 0.12 ppm from the sample collected at a depth of 30 feet. TPHg <br /> was not detected in this sample. <br /> Based on the analytical results from the drilling and the UST removal, San Joaquin Co. <br /> Environmental Health required that Ultramar install three groundwater monitoring wells to <br /> assess groundwater conditions beneath the site. These wells were installed in December 1993. <br /> Analytical results of water samples collected from the wells indicate that groundwater beneath <br /> the site is impacted with gasoline hydrocarbons. Quarterly monitoring of the wells was <br /> 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 /> MW-6 through MW-9 were installed in September 1997. <br /> f <br /> f <br /> BEACON <br /> A Member of the Ultramar Group of Companies #1 Quality and service <br /> uitrarr"iar <br />