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The client will decide if additional uncovering by hand is required If it is confirmed that the <br /> UST system has been encountered,tightness tests are performed The hole is backfilled only <br /> with client approval <br /> 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 2-inch-OD,hand <br /> auger manufactured by Xitech Industries, Art's Manufacturing Company, or similar equipment <br /> Soil samples are collected with a drive sampler, which is outfitted with 1 5-mch by 3-mch steel <br /> or brass sleeves The specific equipment used is noted on a soil boring log <br /> • Truck-mounted, powered drilling Truck-mounted, powered drilling utilizes hollow-stem flight <br /> auger drilling, air rotary drilling, or percussion hammer drilling, or similar technologies Soil <br /> samples are collected in steel or brass sleeves with a California-modified, split-spoon sampler <br /> or, for specific projects, a continuous sampler The specific drill system and equipment used is <br /> noted on a soil boring log <br /> • Direct push sampling Direct push sampling utilizes Geoprobes, cone penetrometer testing rigs <br /> (CPT), or similar technologies Soil samples are collected with a drive sampler,which is <br /> outfitted with steel or brass sleeves The specific equipment used is noted on a soil boring log <br /> Before each soil sampling episode,the sampling equipment is decontaminated using a non-phosphate soap <br /> wash, a tap-water rinse, and a deionized water rinse The drill string of all systems is decontaminated with <br /> 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 tape <br /> followed by plastic caps If U S Environmental Protection Agency(USEPA)Test Method 5035 is <br /> required,then 5 to 20 grams of soil is extracted from the sample and placed in methanol-preserved <br /> containers supplied by the laboratory,or sub samples are collected using Encore samplers During the <br /> drilling process, soil samples and cuttings are field screened for volatile organic compounds(VOCs) using <br /> a photoionization detector calibrated to 100 parts per million by volume(ppmv) isobutylene Any soil <br /> staining or discoloration is visually identified <br />. Soils are classified according to the Unified Soil Classification System Specific geologic and hydro <br /> geologic information collected includes grading, plasticity,density, stiffness, mineral composition, <br /> H m\DIEnvnronmentWTannarTexaco\Reports1SAR1203 wpd <br />