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I EER TTL RYAN INC. _ • REQUEST FOR CLOSURE - at Former Unocal Service Station No 0123 1034 Central Avenue Tracy, California Report No 240073 06 INTRODUCTION At the request of Unocal Corporation (Unocal), Gettler-Ryan Inc (GR) has prepared this report requesting regulatory closure for former Unocal service station #0123 located at 1034 Central Avenue in Tracy, California This closure report presents a chronology of the investigations performed at the site to • date, followed by a rational for why closure should be granted for this site by presenting the data requested in the Central Valley Regional Water Quality Control Board's Appendix A Tri-Regional Board Staff Recommendations For Preliminary Investigation And Evaluation of Underground Tank Sites, No Further Action Requests, dated October 1996 SITE DESCRIPTION The site is located on the southeast corner of the intersection of Central Avenue and 11`i' Street in Tracy, California (Figure 1) The stte 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'h 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 property was purchased by Bank of America in 1962 In 1965, all subsurface and aboveground facilities were demolished and removed from the site, except for the northern most UST cluster, which was located beneath the sidewalk In 1996, two of the three remaining USTs were removed, and the remaining UST was properly abandoned in place The site is currently an asphalt-paved parking lot owned by and servicing Ayers and Ward Real Estate Investment Services, located immediately to the south Pertinent site features are shown on Figure 2 SUMMARY OF ENVIRONMENTAL WORK A limited subsurface investigation,was conducted by L M Swift for Wells Fargo and is detailed in a Phase I Report dated March 29, 1994 The investigation included an underground electronic survey of the parking lot to determine if any abandoned USTs existed beneath the site, and exploratory borings to collect soil and groundwater samples The underground survey detected no large metal anomalies, and 6747 Sierra Court , Suite J Dublin , California 94568 - ( 925 ) 551 -7555