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t FIRESTONE TIRE AND RUBBER COMPANY a STOCKTON, CALIFORNIA f SOIL SAMPLING RESULTS On September 10, 1991, additional soil samples were taken at the Firestone facility located at 400 N. EI Niado St, Stockton, California (See Figure 1). The o soil sampling locations and an*sis followed the approved workplan submitted to the Public Health Services (PHS), San Joaquin County. 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 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 E Tank 5 location, Mr. Harlin asMsi in the decision to analyze 3 soil samples from each boring at the following depth`s: 15 feet,30 feet, and 40 fent below grade. The locations of the soil sampling work is depicted on Figure 1. Soil sampling results reported by the laboratory are summarized on Table 1. Laboratory data sheets and chain-cf c-ustody forms are presented in Attachment A. Following is a brief discussion of the sample activities, results, conclusions and I recommendations for Tanks 5,''6,':and 16. ti . I Soil samples were taken from two borings located approximately five feet south and north of the Tank 5 exw vation. The drilling work was performed by Spectrum Exploration. A geologist from Meinfelder 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 PD was used to �rovide 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 prodded 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 chemical distribution throughout`,the soil profile. , The results of the soil analysis;work as reported by Curtis and Tompkins indicates no chemical migration viithin the soil profile sampled on September s