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i Y Applied GeoSystems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 • FREMONT • IRVINE • HOUSTON • BOSTON • SACRAMENTO • CULVER CITY • SAN JOSE RECEIVE JUN 1 9 1"n3 June 14, 1990 ENVIRONMENTAL HEALTH 0606ERAT PERMIT/SERVICES AGS 30041-1 Ms. Eleanor Ratliff San Joaquin Public Health Service P.O. Box 2009 Stockton, California 95201 Subject: Confirmation of telephone conversation concerning guidelines for installation of underground gasoline tanks and associated environmental investigations at ARCO Station No. 6100, 25775 South Patterson Pass, Tracy, California. Ms. Ratliff: Applied GeoSystems is sending this letter to confirm our telephone conversation of May 30, 1990, in response to our letter dated May 15, 1990, regarding San Joaquin Public Health District (SJPHD) Guidelines for installation of underground tanks and associated environmental investigations. ARCO Products Company (ARCO) proposes to install new underground storage tanks at the subject site. We understand if results of laboratory analyses of soil samples collected from two soil borings drilled in the proposed tank cavity indicate the soil in this area has not been impacted by hydrocarbons, ARCO can install the new underground storage tanks without further sampling after excavating. If results of analyses of soil samples from the borings indicate the soil in the new tank cavity area does contain hydrocarbons levels which require mitigation, the tanks can be installed in the new tank cavity providing ARCO (1) commits to a date to submit a "Soil Contamination Work Plan" and (2) installs vapor-recovery wells where appropriate if hydrocarbons exist in the soil below the bottom of the new underground tanks. After the hydrocarbons are delineated, a commitment to submit a "Soil Remediation Plan" will be made. ARCO will provide the SJPHD with quarterly updates throughout the process. The work will be performed in accordance with the Central Valley Regional Board Staff