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v v FIRESTONE TIRE AND RUBBER COMPANY STOCKTON, CALIFORNIA SOIL SAMPLING RESULTS On Segcember 10, 1991, additional soil samples were taken at the Firestone facility located at 400 N. El Dorado St, Stockton, California (See Figure 1). The soil :ampling locations and analysis followed the approved workplan submitted to the Public Health Services (PHS), San Joaquin Counti. Soil samples were taken at two borings located on the north and south side of the former Tank 5 site and at former tank 6 and 16 locations. Mr. Harlin Knoll a PHS inspector and environmental health specialist was on- site during the soil sarapling activities. Mr. Harlin wit-aessed the sampling techniques and directed the number, the location, and the depths of the samples at Tanks 6 and 16. Additionally, at the conclusion of the drilling work at the Tank 5 location, Mr. Harlin assist in the decision to analyze 3 soil samples from each boring at the following depths: 15 feet, 30 feet, and 40 feet below grade. The locations of the soil sampling work is depicted on Figure I. Soil sampling results reported by the laboratory are summarized on Table 1. Laboratory data sheets and chain-of-custody forms are presented in Attachment A. Following is a brief discussion of the sample activities, results, conclusions and ecommendations for Tanks 5, 6, and 16. T=k 5 Soil samples were taken from two borings located approximately five feet south and north of the Tank 5 excavation. The drilling work was performed by Spectrum Exploration. A geologist from Kleinfelder log the borings, retrieved samples, and completed the chain-of-custody for laboratory analysis. Boring logs are presented in Attachment B. Soil samples were taken through a hollow stem auger using a split spoon. Each soil sample was sealed with teflon tape, capped, logged, and placed on ice. Both borings were completed to a depth of 41.5 feet. No free water was encountered during the drilling work. Soil samples were taken at 5 foot intervals and a PID was used to provide field information during the drilling work. Based on the boring results and after consultation with Harlin Knoll, samples from the 15, 30, and 40 foot locations were selected for laboratory analysis. The 15 foot sample provided information on potential chemical distribution near the invert of the former tanks. Thi 30 and 40 foot samples provided additional vertical and horizontal information on the potential chemical distribution throughout the soil profile. The results of the soil analysis work as reported by Curtis and Tompkins indicates no chemical migration within the soil profile sampled on September