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r MOHR-FRY RANCHES 950 Industnal Drive, Stockton, California r Phase I Remedial Report 1.0 PROJECT IDENTIFICATION This project has been developed to 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 I work explored the vertical extent of diesel fuel, benzene, toluene, xylenes, and ethyl benzene (BTX&E) having been released to the soil ' and groundwater in the vicinity of the former underground storage tanks i 1.1 Site Description and History On February 8, 1991 , SEMCO, under permit, removed Mohr-Fry's fuel facility, which consisted of four (4) underground storage tanks Three (3) 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 (3) smaller tanks disclosed concentrations of diesel, toluene, xylene and ethyl benzene Concentrations of diesel, only, were present in soil samples taken under each end of the 4,000 gallon tank (Appendix A) Contaminated soils have been stockpiled on site Composite sampling was con- ducted at the time of tank removal and the results are included in Appendix A The disposition of this soil is pending the results of the subsurface investigation 2.0 OBJECTIVE The objective of this project was to determine if significant soil and groundwater con- tamination exists by conducting borings and hydropunch sampling through the two (2) former tank excavations The information obtained from soil and groundwater sampling would be used to determine whether additional investigation will be necessary 3.0 SCOPE OF WORK The Phase I site investigation included two (2) soil borings, to groundwater, drilled through each of the two (2) former tank excavations (Figure 2) Soil sampling began at a depth of five feet (5') below the tank removal sampling depth, 15 feet for the smaller