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Quarterly Summary Report <br /> Third Quarter 1998 <br /> F <br /> Former Unocal Service Station 0123 <br /> 1034 Central Avenue <br /> Tracy, California <br /> BACKGROUND <br /> The site was reportedly an operating Unocal service station from 1920 through 1962 Two <br /> underground storage tank(UST) complexes have existed at the site A cluster of three UST's <br /> located at the northern property boundary adjacent to the I Ith street site were identified as <br /> "abandoned" and a second cluster of three tanks to the south were identified as active UST's <br /> The property was purchased by Bank of America and the service station was demolished in <br /> 1962 <br /> The site is currently an asphalt-paved parking lot owned by and servicing the Wells Fargo <br /> Bank located immediately to the south A limited subsurface investigation was conducted by <br /> LMS As requested by the an Joaquin County Public Health Services, Unocal submitted a <br /> work plan to perform a soil and groundwater investigation Nine soil borings and three <br /> groundwater monitoring wells were installed in may 1995 Exploratory test pitting was <br /> performed and two abandoned UST's were encountered at the northern property boundary, <br /> beneath the I 1 th street sidewalk A report documenting the soil and groundwater <br /> investigation was submitted to Unocal and San Joaquin County in December 1995 <br /> On September 6, 1996, Unocal submitted a corrective action plan to,address hydrocarbon <br /> impacted soils that may be encountered during removal of the UST's Two abandoned 550- <br /> gallon UST's were removed in November 1996 A third UST was encountered during the <br /> removal activities and was properly abandoned in place by grout infection One groundwater <br /> i <br /> monitoring well was installed in December 1996 in the location of he removed UST's to <br /> evaluate soil and groundwater quality Two groundwater monitoring wells (U-5 and U-6) <br /> were installed on October 6, 1998 In addition, one continuous core soil boring was <br /> advanced in efforts to delineate the lateral and vertical extent of hydrocarbon solvents in soil <br /> and groundwater + <br /> i <br /> 310-0971 BL3QSR98 1 December 4, 1998 <br />