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r , �1 gMc®n Associates 1433 North Market Boulevard • Sacramento California 95834-1943 • (916)928-3300 • Fax(916)928-3341 April 27, 1995 Project 0805-152 02 Mr Kyle Christie ARCO Products Company 1255 South Bascom, Suite 202 Campbell,Califomia 95008 Status Report, First Quarter 1995, ARCO Service Station 6100, 25775 South Patterson Pass Road, Tracy, California Dear Mr Christie At the request of ARCO Products Company (ARCO), EMCON is presenting this status report for work conducted during the first quarter 1995 at the subject site The location of the site is shown on the Site Location Map (see Figure 1), and the configuration of the site is shown on . the Site Map (see Figure 2) PREVIOUS WORK In June 1990, RESNA Industries ([RESNA] formerly Applied GeoSystems) observed drilling of five soil borings (B-1 through B-5) at the site (Applied GeoSystems, July 16, 1990, Report 30041-1) Gasoline hydrocarbons were detected in soil samples collected from the borings Roux Associates (Roux) conducted an investigation from November 1990 to February 1991 in conjunction with the removal of five underground storage tanks and associated product delivery lines (Roux, May 29, 1991, Report AR06776W) Soil containing residual hydrocarbon within the tank cavity was excavated to 15 to 25 feet below ground surface (bgs) Soil samples collected from the limits of the enlarged tank cavity contained concentrations of total petroleum hydrocarbons as gasoline up to 7,400 parts per million Four new tanks were installed in the new tank cavity In October and November 1991 and June 1992, RESNA observed drilling of 20 soil borings (B-6 through B-25) and construction of 15 vapor extraction wells Residual gasoline hydrocarbons were detected in soil beneath the dispenser islands, between the underground gasoline storage tanks and the dispenser islands, along the north and west • 5AC1N 1P7010805108051520 2AL-94\drns 3