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EmC®n Associates <br /> Kaool <br /> Vwssj 1433 North Market Boulevard • Sacramento California 95834 1943 • (916)928-3300 • Fax(916)928-3341 <br /> RWAMEW- <br /> 40 September 12, 1994 <br /> Project 0805-11101 <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> PO Box 5811 <br /> San Mateo, California 94402 <br /> Re Status Report, Second Quarter 1994, ARCO Service Station No 6100, 25775 <br /> South Patterson Pass Road, Tracy, California <br /> Dear Mr Carmel <br /> i <br /> At the request of ARCO Products Company (ARCO), EMCON Associates (EMCON) is <br /> presenting this status report for work conducted during the second quarter 1994 at ARCO <br /> Service Station No 6100, 25775 Patterson Pass Road, Tracy, California The site location <br /> is shown on Figure 1, and the site configuration is shown on the Generalized Site Plan <br /> (See Figure 2) <br /> PREVIOUS WORK <br /> In June 1990, RESNA Industries ([RESNA] formerly Applied GeoSystems) observed <br /> drilling of five soil borings (B-1 through B-5) at the site (Applied GeoSystems July 16, <br /> 1990, Report 30041-1) Gasoline hydrocarbons were detected in soil samples collected <br /> from the borings <br /> i <br /> Roux Associates (Roux) conducted an investigation from November 1990 to February <br /> 1991 111 Lonlunction with the removal of five underground storage tanks and associated <br /> product-delivery lines (Roux, May 29 1991, Report AR06776W) Soil containing residual <br /> petroleum hydrocarbons within the tank cavity was excavated to 15 to 25 feet below <br /> ground surface (bgs) Soil samples collected from the limits of the enlarged tank cavity <br /> contained concentrations of total petroleum hydrocarbons as gasoline (TPHG) up to 7,400 <br /> parts per million Four new tanks were installed in the new tank cavity <br /> In October and November 1991 and June 1992 RESNA observed drilling of 20 soil <br /> borings (B-6 through B-25) and construction of 15 vapor-extractions wells Residual <br /> gasoline hydrocarbons were detected in soil samples collected beneath the dispenser <br /> Islands between the underground gasoline storage tanks and the dispenser islands, along <br /> the north and west sides of the former gasoline tank cavity, and near the southeast corner <br /> of the site (RESNA January 31 1992, Report 30041-2, and November 12 1992, <br /> snuhj(N1X05\rX0i t 110 imm-94 h,, i <br />