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EEC 54114 UniPirst Stockton September 17,2002 Stockpile Samples Laboratory test results of soil samples collected from the stockpiled soil for disposal characterization indicated that no TPHd or BTEX was present. Lead was detected in one of the five stockpile samples (SP2) and TPHg was detected in two of the five stockpile samples (SP-2 and SP-5). Sample SP-2 contained lead at a concentration of 170 ppm and TPHg at a concentration of 0.23 ppm. Sample SP-5 contained a TPHg concentration of 0.61 ppm. Because sample SP-2 contained a lead concentration greater than 50 ppm, a leaching test was performed on the sample to determine if the soil should be classified as a hazardous or non-hazardous waste. The leaching test indicated that the soluble threshold limit concentration(STLC) for lead was 0.36 ppm, far below the concentration of 5.0 ppm which would result in a hazardous classification. Pipe Sample All pipelines unearthed during the excavation activities were either empty or were packed with soil. EEC collected one sample of soil from within one of the pipelines. Laboratory test results indicated TPHg at a concentration of 0.49 ppm, and a xylene concentration of 0.011 ppm. Disposal On August 21, 2002 all soil with discoloration or indication of hydrocarbons were removed from the site. A total of approximately 225 tons of soil was transported under non-hazardous waste manifest to Forward Landfill of Stockton, California. Forward is a Class II landfill,permitted to accept waste materials containing petroleum. In addition, approximately 275 linear feet of pipe, and the metal waste-oil drum were removed from the site and transported to Forward Landfill under a non-hazardous waste manifest. Copies of the manifests and weight ticket are included in the Appendix. Summary The following is a summary of observations, field activities, and laboratory results for work conducted at the site between August 6, 2002 and August 19, 2002 • The site was apparently once the location of a gasoline service station. • Underground storage tanks at the site were apparently removed many years ago, the exact date is unknown. • A waste-oil drum was encountered during grading activities. Oil contained within the drum was removed and transported to an appropriate facility. • Underground piping related to the former UST's was removed during construction activities in August 2002. • Discolored soil and soil with hydrocarbon odors was encountered around the piping. This soil was removed from the site and transported to Forward Landfill in Stockton, California. • Laboratory analyses of soil samples indicate that very low concentrations of TPHg were present in the soil. No TPHd or BTEX was present. Lead was non- detectable in all samples except for sample SP-2,which contained lead at non- hazardous concentrations. 4