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ETT 1 E R - YA' - Ij�C. WORK PLAN FOR ADDITIONAL SUBSURFACE ASSESSMENT at Former Unocal Service Station#0123 1034 Central Avenue Tracy, California Report No. 240073.04 INTRODUCTION At the request of Unocal Corporation (Unocal), Gettler-Ryan Inca(GR) has prepared this Work,Plan for. additional.subsurface assessment at the subject site. .-The purpose of this investigation is to,further evaluate the distribution of residual petroleum hydrocarbons in soil and groundwater downgradient of the subject site: .This work was requested by San Joaquin County Public Health Services Environmental Health Division.(SJCPHS-EHD) in a letter dated August 15, 2000. The proposed scope of work includes:. obtaining the required well installation and encroachment permits; updating the.site safety plan; installing two groundwater,monitoring wells; collecting soil sample's-for.possible chemical'analysis;,surveying the newly installed wells, developing and sampling the new wells,'analyzing selected soil and groundwater samples;and preparing a report presenting the findings of i, a investigation. The scope of work described in this.Work Plan is intend to toVcomply with the .State of California Water. Resources Control-Board's Leaking Underground.Fuel Tanks (LUFT) Manual, the California Regional Water Quality Control Board's (CAW.QCB) Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites,and SJCPHS-EHD guidelines., SFTE DESCRIPTION The site is located on the southeast corner.of the.intersection of Central Avenue and.l l�' Street in Tracy, California (Figure 1). The-.site was reportedly an operating Unocal service station-from 1920 through 1962. Two underground storage tank(UST) complexes have existed at the site. A cluster of three USTs was located at the northern property boundary adjacent to I I' Street, and a-second cluster of three tanks located to the south that was active at the time of closure in 1962.. Other.station facilities consisted of a station building, a dispenser island, and one waste oil UST. The propeity.was purchased by Bank of America in 1962. All subsurface and aboveground facilities have been demolished and removed from the site (except for one UST at the northern property boundary that was abandoned in place). The site is currently an asphalt-paved parking lot owned by and servicing the Wells Fargo Bank located immediately to the south. Pertinent site-features,are shown on Figure 2. 6747 SierraCourt , Suite J .Dublin , California 94568. •_ ( 925 ) 551 - 7555