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OWN r`4 A&A Tool Rentals 2911 East Fremont Street, Stockton, California Phase II Report of Findings Soil Boring in Waste Oil Tank Area 1.0 Site History On February 19, 1993 WHF Environmental Consultants, Inc. submitted a work plan to Michael Collins of the San Joaquin County Health Department to investigate the area beneath the former waste oil tank area. The investigation was required by the County to check for the presence of soluble chromium and soluble nickel, as samples tested for those metals at the time of the tank removal indicated elevated levels using the "TTLC" testing methodology. WHF contracted with Pierson Drilling Company to perform the boring which was made on March 12, 1993. Pierson Drilling used a 8 718" hollow stem auger to make the boring to a depth of 15' form the soil surface. A single soil sample was obtained ,. using a modified California split spoon sampler containing a brass sleeve. The sample was contained in an ice chest with both crushed ice and Blue Ice, and transported under chain of custody to the Greyhound bus station in Modesto, California, who �. shipped the samples to Geo Monitor Laboratories in Hesperia, California for analysis. 2.0 Summary of f ndings The samples were tested using the "STLC" extraction procedure using de-ionized water as the extraction solution, as directed by the County Health Department. The samples were tested for chromium with results of less than 0.06 mgll being found. The nickel results were 1.22 mgll found in the sample. Sampling of the soils was witnessed by Dianne Hinson from the County, and the samples themselves were transported by Steve Furnas of WHF. No boring logs were made as previous investigations at the site *" contain sufficient geological information. The results of the previous investigation is �. contained in the appendices of this report.