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INTERNATIONAL <br />TECHNOLOGY <br />CORPORATION <br />PACIFIC BELL <br />345 North San Joaquin <br />Stockton, California <br />SAMPLING METHODOLOGY <br />In order to achieve representative soil samples from beneath the <br />300 and 500 Gallon Diesel Storage tanks in the basement at 345 N. San <br />Joaquin, it will be necessary to hand or power auger 2 -four inch <br />diameter borings under each tank. The borings will begin approximately <br />2 feet from the edge of each tank on one side and will proceed downward <br />at an angle to culminate under the approximate centerline of the tank. <br />Two borings will be executed for tank. One boring on one end and <br />the second on the other end. <br />Soil samples will be collected at the interface of fill and native <br />soil and approximately 2 feet into the native soil. During the augering <br />procedure the boiing will be carefully measured and a boring log kept <br />noting types of soils, moisture content, etc. When the fill/native soil <br />interface is noted the augering will be stopped and a decontaminated <br />brass tube will be driven into the base of the boring utilizing a soil <br />coring device with a sliding hammer. The brass tube will be withdrawn and <br />capped with aluminum foil, a plastic cap, and labeled and placed into <br />an ice chest containing blue ice to keep the sample cool. The augering <br />will then recommence for an additional 18 inches toinches where a <br />similar sample technique will be used to obtain the final sample for <br />the boring. <br />If at any time during the augering activity groundwater is <br />encountered the augering will be stopped, and a soil sample will be <br />obtained. A clean coliwasa sampler will then be used to collect a <br />sample of the water from the boring. The water will be brought to the <br />surface and immediately placed into a 40 ml VOA vial leaving no void <br />space in the top, the lid tightly placed, and placed in to the <br />ice chest. The sample will of course be labeled as'to time, date, <br />and collection point. <br />Regional Office <br />4585 Pacheco Boulevard • Martinez, California 94553.415-372-9100 <br />IT Corporation is a wholly owned subsidiary of International Technology Corporation <br />