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Mohr-Fry Ranches 950 Industrial Drive, Stockton, California May 30, 1996 • Bioremediation Report page; 3 ' 3.1 Soil Sampling Soil samples were taken in 1" by 6" brass sleeves from relatively undisturbed,soil ' Samples were collected from within the treatment cell with a hand operated drive hammer spoon sampler All soil sampling equipment was thoroughly washed with tnsodium phosphate and then rinsed thoroughly before and between sampling to ' prevent cross contamination The soil samples did not have head space and were immediately sealed in their Inners using aluminum foil lined plastic caps The samples were then sealed in air-tight plastic bags and immediately placed in an ice ' chest cooled with Blue Ice® All samples were then transported with appropriate chain of custody documents to California Laboratory Services, a State-certified laboratory located in Rancho Cordova, California Sampling was witnessed by Mr ' Steve Sasson representing the San Joaquin County PHS/EHD on November 11, 1995 3.2 Requested Analysis Soil samples were analyzed using EPA method 3550 LLFT for Total Petroleum Hydrocarbons as Diesel, Motor Oil, and Gasoline, and EPA method 8020 for Benzene, Toluene, Xylene and Ethyl Benzene (Table 1, Table 2, & Appendix A) I3.3 Analytical Findings All samples tested "ND", None Detected, for Benzene, Toluene, Ethyl Benzene, Xylene and Gasoline (Table 1, Table 2, and Appendix A) Diesel and Motor Oil contaminants were detected in many of the soil samples (Table 1 and 2) However, these detection and/or levels are below the 1,000 mg/kg level identified in the LUFT assessment found in Appendix B of this report All sample locations are identified in Figure 3 Analytical data with chain of custody records can be Ireferenced in Appendix A- 4.0 Conclusions do Recommendations All contaminated soil from the remedial excavations was treated for a duration of twelve months The volatile aromatic compounds (BTX&E) have since been removed (Table 1 & Appendix A) coupled with the levels of Diesel and Motor Oil being significantly diminished (Table 2 & Appendix A) Satisfactory action was taken under a different contract to mitigate the acetone previously released from the two 8,000 gallon tanks ., (Section 2 0 of this report) Contamination, associated with the groundwater, has not been detected in any of the last four(4) quarterly groundwater monitoring events