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Ultramar
<br /> TelecoPY` 209-585-5685 Credit
<br /> Ultramar,Inc. 209-583-3330 Administrative
<br /> P.O.Box 466 209-583-3302 Information Services
<br /> 525 W.Third Street 209-583-3358 Accounting
<br /> Hanford,CA 93232.0466
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<br /> DATE REPORT SUBMITTED: January 25, 1999
<br /> QUARTER ENDING: December 31 1998
<br /> FORMER SERVICE STATION NO.:
<br /> F 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 soilsamples collected from borings drilled during the j
<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-l6, 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.
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<br /> I
<br /> BEACON
<br /> 1
<br /> A Member of the Ultramar Group of Companies #1 Quality and Service
<br /> Ultramar
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