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Quarterly Summary Report <br /> Second Quarter 1998 <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 t� the 11`h street 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 anki the service station was demolished in i <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 Publilc 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 11 th street sidewalk. A report documenting the soil and groundwater <br /> investigation was submitted to Unocal and San.Joaqum 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 remolval 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 plllace by grout injection. One groundwater <br /> monitoring well was installed in December 1996 in the location of he removed UST's to <br /> evaluate soil and groundwater quality. <br /> RECENT QUARTER ACTIVITIES <br /> The Second Quarter 1998 groundwater monitoril g event was performed in June. <br /> • The First Quarter 1998 Quarterly Summary Report (QSR)was submitted in May. <br /> • A Work Plan proposing the installation of two groundwater monitoring wells and one - - <br /> continuous soil boring was submitted to the app ilopriate agencies on July 15, 1998. <br /> 3100971BNQSR298 1 August'7, 1998 <br />