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Drilling Methods <br /> Before drilling began, Underground Service Alert was notified of our intent to drill so that <br /> approximate locations of underground utility lines and structures could be marked The soil <br /> borings were started by hand-augering to a depth of 5 feet to minimize the possibility of <br /> damaging underground utilities <br /> The borings were drilled with a Mobile B-61 drill rig equipped with 10-inch-diameter, <br /> continuous-flight, hollow-stem augers The augers were steam-cleaned before use in each <br /> boring to rrunimize cross-contamination between borings The drill cuttings were stored at <br /> the site on and covered with plastic <br /> Soil Sampling in Borings <br /> Soil samples for analysis and identification were collected at approximately 5-foot intervals <br /> from the borings during drilling Soil samples were collected by advancing the boring to a <br /> point dust above the sampling depth, and then driving a California-modified, split-spoon <br /> sampler containing clean brass sleeves through the hollow center of the auger into the soil <br /> The sampler is driven 18 inches with a standard 140-pound hammer repeatedly dropped 30 <br /> inches The number of blows needed to drive the sampler each successive 6 inches is <br /> counted and recorded to evaluate the relative consistency of the soil Sampling equipment <br />• was cleaned between each use with an industrial soap and clean tap water <br /> The samples selected for laboratory analysis were removed from the sampler and promptly <br /> sealed in their brass sleeves with aluminum foil, plastic caps, and duct tape The samples <br /> were labeled and promptly placed in iced storage for delivery to a laboratory certified by <br /> the State of California <br /> Loamy-of Borari�s <br /> Soil cuttings and samples were logged using the Unified Soil Classification System Samples <br /> not selected for chemical analysis and the soil sampler shoe are extruded in the field for <br /> examination The texture, color, moisture, plasticity, and consistency of soil, the blow <br /> counts, and subjective evidence of hydrocarbons, such as soil staining, obvious product odor, <br /> and photoionizatton detector (or similar instrument) readings were noted in the field on the <br /> Logs of Borings <br /> Sampling Drill Cuttings <br /> Soil samples were collected from the stockpiled soil by driving a hand-operated percussion <br /> sampler fitted with a clean brass sleeve into the stockpiled soil The sleeve was removed <br /> from the sampler and promptly sealed with aluminum foil, plastic caps, and duct tape The <br /> 30055-5 <br />