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REVISED WORK PLAN ADDENDUM May 1996 Calkins Trucking 19601 North Highway 99 Acampo, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr. Les Calkins, Adval7ced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Site Investigation Work Plan for 19601 North Highway 99 in Acampo, California. The work plan includes the advancement of four soil probings and collection of soil samples from stockpiled and backfilled soil. The location of the site is illustrated on Figure I - Location Map. A plan of the site is illustrated on Figure 2 - Site Playa. This Work PIan is prepared in accordance with the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board guidelines for investigation of underground storage tank (UST) sites. 2.0. BACKGROUND 2.1. SITE DESCRIPTION The site area is located in an agricultural area of low topographic relief south of Acampo, California, near the intersection of Highway 99 and Woodbridge Road. In 1957, three underground storage tanks (USTs) were installed at the site: two 10,000-gallon diesel USTs and a 550-gallon gasoline UST. 2.2. UNDERGROUND STORAGE TANK REMOVAL On 20 December 1991, the three USTs were removed from the site. Underground Tank Closure/Abandonment Inspection reports on file with the PHS-EHD indicate that all tanks and piping were in poor conditions upon removal. Total petroleum hydrocarbons quantified as diesel (TPH-d) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTE&X) were detected in samples collected from the excavated soil at concentrations up to 1,460 mg/kg (milligrams per kilogram or parts per million: ppm). TPH-d and xylenes were detected in the grab water sample collected from the excavation at concentrations of 10,300 and 0.63 ppm, respectively. 2.4. INITIAL SITE ASSESSMENT On 06 July 1992, four soil borings were advanced at the site to a depth of 35 feet below surface grade