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1 Mohr-Fry Ranches ' 950 Industrial Drive, Stockton, California Phase II Remedial Report II.0 Project Identification' ' This project has been developed to further investigate a former underground storage tank facility at the Mohr-Fry Ranches property located at 950 industrial Drive in Stockton, California (Figure 1). The Phase H work explored the vertical and lateral ' extent of Toluene disclosed in the Phase I Investigation. ' 2.0 Site Description and History On February 8, 1991 SEMCO, under permit, removed Mohr-Fry's fuel facility, which consisted of four underground storage tanks Three of the tanks (550 gallon capacity), were used for diesel fuel oil and the other (4,000 gallon capacity), for diesel fuel. Soil samples taken under each of the three smaller tanks disclosed concentrations of diesel ' and Toluene, Xylene, and Ethyl Benzene Concentrations of diesel, only, were present in soil samples taken under each end of the 4000 gallon tank. ' The Phase I site investigation, conductea in February, 1992, by WHF Environmental Consultants, included two soil borings, to ground water, drilled through each of the two former tank excavations. Water samples were checked for floating product and analyzed for the constituents previously found during the tank removal. ' All soil samples were non detect for diesel, benzene, ethyl benzene, and xylene. However, the soil sample taken at 40 feet in depth under the three smaller tanks, B1- 40, disclosed 9.8 p,g/kg toluene. This sample was taken at the top of the ground water ' aquifer. Water in boring B1 was encountered at approximately 51 feet in depth All soil samples taken from boring B2 disclosed toluene in varying concentrations. The ' two water samples were non detect for diesel, benzene, toluene, ethyl benzene and xylene Water in boring B2 was encountered at a depth of approximately 53 feet. The top of the aquifer appeared to be at 50 feet in depth