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INTER-ITIONAL TECHNOLOGY CORPORATION <br /> L. <br /> The four samples were collected using a modified California Split Spoon Sampler enclosing three <br /> (3) decontaminated brass tubes which are six (6) inches in length by two (2) inches in diameter. <br /> Following sample collection, the deepest tube was screened for volatile organics using a photo- <br /> ionization detector, the reading recorded in parts per million, and the middle tube was then <br /> removed and sealed with aluminum foil covered in plastic end caps. The brass tube containing <br /> L' the soil sample was then affixed with an adhesive label, placed in a plastic bag and stored in an <br /> insulated container with ice. The container was secured with sample tape until delivery to the <br /> analytical laboratory on February 3, 1992 under chain of custody control. The four samples <br /> `' (SB1-4, SB2-4, SB3-2, and SB4-4) were analyzed for TPH (gasoline, diesel) and BTEX using <br /> E.P.A. Test Methods modified 8015 and 8020, respectively, by Pace Inc., located in Novato, <br /> California. Chemical analysis of the four soil samples indicate all samples analyzed tested below <br /> the method detection limits for TPH (gasoline, diesel) and BTEX, see attached reports of <br /> laboratory analysis. <br /> The method of soil logging utilized by the field geologist was the Unified Soil Classification <br /> System (USCS), as described in United States Bureau of Reclamation document No. 5005-86. <br /> The area over the tankfield is covered by a six (6) inch layer of asphalt underlain by 0.5 feet <br /> of sand and gravel fill material. The soils underneath the near surface fill layer consist of brown <br /> to light brown silty sand to twenty feet below ground surface, the total depth investigated. <br /> Following completion of the soil boring drilling and sampling, the four borings were backfilled <br /> to surface with neat cement and allowed to cure. Soil cuttings excavated while drilling the four <br /> borings were placed in four (4) 55-gallon H-type steel drums that were properly labelled, and <br /> the drums were stored on site. <br /> IT continues to value and appreciate Yellow Freight System, Inc. business. If you have any <br /> bw questions or comments regarding this report, please do not hesitate to call at: (510) 372-5296. <br /> Sincerely <br /> bw Cary Bean <br /> Project Manager <br /> Groundwater Field Services <br /> r <br />