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2 Drilling and Soil Sampling Procedures <br /> Soil boring are drilled using one of the following methods <br /> • Manual or Hand Auger Drilling Manual or hand auger drilling utilizes a <br /> 2-inch-OD, hand auger manufactured by Xitech Industries, Art's Manufacturing <br /> Company, or similar equipment Soil samples are collected with a drive sampler, <br /> which is outfitted with 1 5-inch by 3-inch steel or brass sleeves The specific <br /> equipment used is noted on a soil boring log <br /> • Truck-mounted, powered drilling Truck-mounted, powered drilling utilizes <br /> hollow-stem flight auger drilling, air rotary drilling, or percussion hammer <br /> drilling, or similar technologies Soil samples are collected in steel or brass <br /> sleeves with a California-modified, split-spoon sampler or, for specific projects, a <br /> continuous sampler The specific drill system and equipment used is noted on a <br /> soil boring log <br /> • Direct push sampling Direct push sampling utilizes Geoprobes, cone <br /> penetrometer testing rigs (CPT), or similar technologies Soil samples are <br /> collected with a drive sampler, which is outfitted with steel or brass sleeves The <br /> specific equipment used is noted on a soil boring log <br /> Before each soil sampling episode, the sampling equipment is decontaminated using a <br /> . non-phosphate soap wash, a tap-water rinse, and a deionized water rinse The drill string of all <br /> systems is decontaminated with a steam cleaner between each soil boring <br /> Soil samples that are collected in steel or brass sleeves are covered with aluminum foil or Teflon <br /> tape followed by plastic caps If U S Environmental Protection Agency (USEPA) Test Method <br /> 5035 is required, then 5 to 20 grams of soil is extracted from the sample and placed in <br /> methanol-preserved containers supplied by the laboratory, or sub samples are collected using <br /> Encore samplers During the drilling process, soil samples and cuttings are field screened for <br /> volatile organic compounds (VOCs) using a photoionization detector calibrated to 100 parts per <br /> million by volume (ppmv) isobutylene Any soil staining or discoloration is visually identified <br /> Soils are classified according to the Unified Soil Classification System Specific geologic and <br /> hydro geologic information collected includes grading, plasticity, density, stiffness, mineral <br /> composition, moisture content, soil structure, grain size, degree of rounding, and other features <br /> that could affect contaminant transport All data is recorded on a soil boring log under the <br /> supervision of a geologist registered in the state in which the site is located The samples are <br /> labeled, sealed, recorded on a chain-of-custody record, and chilled to 4' Celsius in accordance <br /> with the procedures outlined in the California State Water Resources Control Board's Leaking <br /> Underground Fuel Tank Field Manual (CSWRCB, 1987) and the Arizona Department of <br /> Environmental Quality's Leaking Underground Storage Tank Site Characterization Manual <br /> Sample preservation,handling, and transportation procedures are consistent with Consultants's <br /> Main\D%nvironmental\ParmarTexaco\Workplan\042003 wpd 3 <br />