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1 <br /> 1.0 INTRODUCTION <br /> The purpose of this workplan is to outline a scope of work to perform additional <br /> ' assessment of the occurrence of hydrocarbons and volatile organic compounds <br /> beneath the former Unocal Station at 3788 Tracy Boulevard, Tracy, California (Figure <br /> ' 1 ) Mittelhauser Corporation (Mittelhauser) has prepared this workplan in response <br /> to the letter from San Joaquin County Public Health Services/Environmental Health <br /> ' Division (SJCPHS/EHD) Technical Review Committee (TRC) dated December 28, <br /> 1994, expressing concerns regarding delineation of residual contamination at the site <br /> 20 SITE HISTORY <br /> ' The former Unocal station was originally constructed b Unocal in 1972 I <br /> g Y Y It operated <br /> as a "full service" station until 1976, when it was converted to a "self service" <br /> facility In 1991 , Mittelhauser Corporation installed a series of four monitoring wells <br /> in order to determine groundwater flow direction, and to investigate hydrocarbon- <br /> impacted soil and potential groundwater contamination The station was closed to <br /> ' business in 1992 In January of 1993, the underground storage tanks (USTs), fuel <br /> dispensers, subsurface piping, and the automobile hoist were removed At the time <br /> ' of removal, the USTs appeared to be in good condition Monitoring well MW-3 was <br /> removed during the tank excavation and was subsequently replaced with MW-3A <br /> Demolition of the station was undertaken in 1993 Soil closure was granted by San <br /> Joaquin County in a letter dated July 18, 1994 <br /> 30 SCOPE OF WORK <br /> 1 <br /> This workplan includes a scope of work, sampling protocol, and site location figures <br /> Also, included in this workplan are preparing of a Site Safety Plan and obtaining <br /> drilling permits from San Joaquin Local Health District The workplan addresses the <br /> 2168VVPOI wpUanuwy 1996 1 /�ittelhauser <br /> C 0 R P 0 9 A T 1 0 N <br />