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I Il J Id FIlZES'1'QNE:TIRE AND RUBBER COMPANY STOCKTON, CALIFORNIA „ SOIL SAMPLING RESULTS O C i {' rmIJ I i ENVIRONMENTAL HEALTH � PERMIT/SERVICES On September 10 1991, additional soil samples were taken at the Firestone facility located at 400 N. EI Dorado St, Stockton, California(See Figure 1). The soil sampling locations ane' an 'clysis followed the approved workplan submitted' I to the Public Health Servicas (PHS), San Joaquin County. Soil samples were I taken at two borin'gs located on the north and south side of the former Tank 5 site and at former tank 6 and 16 locations. Mr. Harlin Knolls PHS inspector and environmental health specialist was on- site during the soil sampling activities. Mr. Harlin witnessed 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 samplixg work is depicted on Figure 1. Soil sampling results reported by the laboratory are summarized on Table 1. Laboratory data sheets and chain-of-custody formas are presented in Attachment A. Following is a brief discussion of the sample;activities, results, conclusions and f recommendations for Tanks 5, 6; and 16. lank Soil samples were taken from two borings located a k� g pproximately 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 min Attachment B. Soil samples were taken through a hollow stem auger using a split spoon. Each soil sample was sealed with teflon tape, f capped, logged, and placed on ice, I Both borings were completed to a'idepth of 41.5 feet. No free water was , encountered durimgthe 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. The 30 and.40 foot samples provided additional'vertical and Horizontal information on.the potential P 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,ori September I J it