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Work Plan Limited Phase II Soil Sampling Reilla West Ott Road and South Wolfe Road French Camp, California Tetra Tech EM, Inc. (Tetra Tech) proposes the following scope of work to conduct a Limited Phase II Environmental Site Assessment (ESA) of the Reilla property (target property), located southwest of the corner of West Ott Road and South Wolfe Road, in French Camp, San Joaquin County, California. The property currently consists primarily as agricultural land and a rural residence. Tetra Tech's review of regulatory information while performing a Phase I ESA of the target property identified potential environmental issues associated with a former underground storage tank (UST) at an adjacent property. The adjacent property, the Raymond Muller residential and dairy property, is located at 9251 South Wolfe Road. According to Mr. Rick Riella, the current property owner, the UST was located approximately 25 feet north of the target property boundary, west of the house and in the area of the two existing aboveground storage fuel tanks. The tank was installed in 1980 and removed within 2 to 3 years from the installation date. Records reviewed at the San Joaquin County Environmental Health Department (SJCEHD) indicate that a 10,000 gallon diesel UST was installed on the property in 1985 and removed in 1989. Records on file with the SJCEHD were limited due to the farm tank exemption status and those reviewed did not indicate spills, leaks or inspection during the time of the UST removal. Tetra Tech will advance three soil borings along the northern boundary of the target property adjacent to the location of the former UST using direct push drilling technology to assess possible impacts from the UST. The three direct push borings will be advanced to groundwater (estimated to be 30' bgs) for collection of grab groundwater samples. Groundwater samples will be analyzed for Total Petroleum Hydrocarbons (TPH) — purgeable, benzene, toluene, ethylbenzene, and xylenes (BTEX) and oxygenates. Each soil boring will be backfilled with grout. The results of the investigation will be documented in a Phase 11 ESA report.