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n IEmcon <br /> 1433 North Market Boulevard .Sacramento Californio 95834-1943• (916)928-3300• Fax(916)928-3341 <br /> • <br /> November 21, 1995 <br /> Project 0805-152.02 <br /> Mr. Kyle Christie <br /> ARCO Products Company <br /> P.O. Box 612530 <br /> San Jose, California 95161 <br /> Re: Thud Quarter 1995 Status Report for ARCO Service Station No 6100, Located at <br /> 25775 South Patterson Pass Road, Tracy, California <br /> Dear Mr Christie. " <br /> At the request of ARCO Products Company (ARCO), EMCON is presenting this status <br /> report for work conducted during the third quarter 1995 at ARCO Service Station <br /> No 6100, located at 25775 South Patterson Pass Road, Tracy, California. The site <br /> location is shown on Figure 1, and the site configuration is shown on Figure 2. <br /> s� <br /> PREVIOUS WORK <br /> In June 1990, at the request of ARCO, RESNA, Industries (RESNA [formerly Applied <br /> GeoSystems]) observed the drilling of five soil borings (B-1 through B-5) at the site <br /> (Applied GeoSystems, July 16, 1990, Report No. 30041) Gasoline hydrocarbons were <br /> detected in soil samples collected from the borings <br /> Roux Associates (Roux) conducted an investigation from November 1990 to February <br /> 1991 in conjunction with the removal of five underground storage tanks (USTs) and <br /> associated product delivery Ines (Roux, May 29, 1991, Report No AR06776V). The <br /> presence of hydrocarbons in soil within the tank cavity necessitated the excavation of the <br /> cavity to depths ranging from 15 to 25 feet below ground surface (bgs) Soil samples <br /> collected from the limits of the overexcavated tank cavity contained concentrations of total <br /> petroleum hydrocarbons as gasoline (TPHG) up to 7,400 parts per million (ppm) Four <br /> new tanks were installed in the new tank cavity <br /> In October and November 1991 and June 1992, RESNA observed the drilling of 20 soil <br /> borings (B-6 through B-25) and construction of 15 vapor extraction wells. Residual <br /> gasoline hydrocarbons were detected in soil beneath the dispenser islands, between the <br /> gasoline USTs and the dispenser islands, along the north and west side of the former <br /> gasoline tank activity, and near the southeast corner of the site (RESNA, January 31, 1992, <br /> • Report No. 30041-2, and November 12, 1992, Report No 30041-3) The lateral extent of <br /> residual gasoline hydrocarbons in soil was delineated at the site, except for the area near <br /> sAON\,PJ0MO"8051520 2a-95\p u 1 <br />