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Applled GeoSystems 4191-E. Power Inn Road,Sacramento,CA 95826 (976)452-2901 •FREMONT i IRVINE • HOUSTON • 605TON •SACRAMENTO •CULVER CITY e SAN JOSE May 24, 1991 AGS 3804$-6W Mr. Chuck Carmel ARCO Products Company P.O. Box 5811 San Mateo, California 94402 Subject: Addendum to Work Plan for a Subsurface Investigation at ARCO Service Station No. 760, 225 South Cherokee Lane, Lodi, California. Mr. Carmel: At the request of ARCO Products Company (ARCO), Applied GeoSystems, Inc. (Applied GeoSystems) is submitting an addendum to our previous work plan No. 38048- 3W, dated April 23, 1990. Additional work includes drilling three soil borings, installing three vapor-extraction wells in the borings, and performing a vapor-extraction test. The purpose of the addition1 work is to evaluate whether remediation of hydrocarbons in native soil underlying the site is feasible by vapor extraction. The data will be used to evaluate remedial alternatives for soil in subsequent phases of work, if warranted. ARCO Service Station No. 760 is located on the northwest corner of South Cherokee Lane and Lodi Avenue in Lodi, California, as shown on the Site Vicinity Map (Plate P- 1). Applied GeoSystems was at the site in May 1990 to observe drilling of three soil borings near the former waste-oil cavity (borings B-1 through B-3). We returned to the site in October 1990 to observe the drilling of rive additional soil borings (B-4 through B-8) 1 near the existing and proposed gasoline tank cavity. Locations of borings B-.1 through B- 8 are shown on the Generalized Site flan (Plate P-2). ResuIts, of the October 1990 investigation indicated residual gasoline hydrocarbons were not present in the soil around the perimeter of the existing tank cavity or near the proposed tank cavity in concentrations that warrant remediation. However, hydrocarbons may be present in soil. underlying t.`>le existing underground-storage tanks at concentrations requiring remediation.