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Site Characterization-Second Event Page 4 Former Karlson Trucking Facility Project No. 191.2 April 27, 2000 presence of overhead obstructions in the originally proposed boring location. • MW-7, approximately due north of the eastern edge of the pole barn building. These borings were drilled using a 8.0 inch outside diameter hollow stem auger owned and operated by V & W Drilling Inc., of Rio Vista, CA (C-57 License #720904). Soil samples were collected for geological and analytical evaluation at five foot intervals using a 2.0 inch diameter by 1.5 foot long hammer driven California Split Spoon sampling device fitted with three 2 by 6 inch stainless steel liners. Soil cuttings and drilling decontamination water were containerized in D.O.T. approved containers awaiting analysis to determine appropriate disposal of this material. 2.1.3 Soil Sampling and Analyses The soil sample collection procedure was as follows: The end of each stainless steel or plastic tube removed from the split spoon or coring device and possibly submitted for laboratory analysis was sealed with tTeflon sheets, capped with plastic end caps, secured with tape, labeled and placed in a cooler at 4° Celsius for transport to the laboratory using Chain of Custody protocol. Chain of Custody (CofQ forms are documents used to track the handling of samples All dates, times, persons and companies handling the samples were listed from the time the sample was collected to its ultimate disposal. All soil sampling equipment was decontaminated between uses by washing using Tri-Sodium Phosphate or Alconox soap in a three bucket wash system. Nitrile gloves were worn during sample collection and changed between the collection of each sample. All sampling equipment was thoroughly cleaned before and between uses. Drilling decontamination water was containerized in appropriate DOT containers for later profiling to determine the proper disposal method of disposal. Soil cuttings were likewise containerized on-site until the analytical data was obtained and the proper disposal method determined Soil samples were shipped to Sherwood Labs (DHS #1400), of Hilmar, California, for analysis. Not all soil samples collected were submitted for laboratory analysis. Field observations, as recorded in the boring logs, and the purpose of the investigation suggested which samples were appropriate for analysis. 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, Ca 95356 Fax: (209) 569-0295