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S O I L S A M P L I N G P R O T O C O L <br /> I SOIL SAMPLING BY DRILLING RIG <br /> 1) Review site proposal for boring locations and special instructions . <br /> Confirm boring locations in field with client Have Underground <br /> Service Alert (USA) mark utilities in area prior to drilling. <br /> 2) Prior to initiating an exploratory boring, all equipment to be <br /> used during drilling and sampling operation is steam cleaned <br /> Such equipment includes, but is not limited to, augers, bits, <br /> drilling rod, and soil samplers Additionally, before each <br /> sampling event, the sampler and any sample liners are thoroughly <br /> cleaned with a dilute trisodium phosphate solution and rinsed with <br /> clean tap water or distilled water Additional decontamination <br /> procedures are implemented as needed by specific projects <br /> 3) Each exploratory boring is drilled with a truck-mounted drilling <br /> rig using either solid flight or hollow stem augers . The boring <br /> is advanced to the desired sampling depth and the sampler is <br /> lowered to the bottom of the hole The sampler is driven a maximum <br /> of 18 inches into the undisturbed soils ahead of the auger by a <br /> 140-pound, rig-operated hammer falling 30 inches . The number of <br /> blows required to drive the sampler the final 12 inches is recorded <br /> on the boring log When necessary, the sampler may be pushed by <br /> the drill rig hydraulics In this case, the pressure exerted (in <br /> pounds per square inch) is recorded After the sampler has <br /> penetrated the full depth, it is retrieved to the surface . <br /> 4) The samplers commonly used are either a California modified sampler <br /> (3 inch or 2 5 inch O. D ) or a standard penetrometer (2 inch O. D. ) <br /> The standard penetrometer does not contain sample liners and is <br /> used to determine soil strength characteristics and visually <br /> characterize the subsurface materials . If samples are collected <br /> for laboratory analysis, the California modified sampler, equippped <br /> with brass liners, is used except when the analysis will include <br /> copper or zinc. In this instance, the sample should be taken with <br /> is the standard penetrometer and placed in a labeled plastic bag <br />