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y <br /> K <br /> a <br /> f� <br /> ' SCT SAMPLING PROTOCOL <br /> I. SOIL. SAMPLING BY DRILLING RIG <br /> y 1} Review site proposal for boring locations and special instructions. Confirm <br /> boring locations in field with client. Have Underground Service Alert(USA) <br /> r' mark utilities in area prior to drilling. <br /> i <br /> 2) Prior to initiating an exploratory boring,all equipment to be used during drilling <br /> and sampling operation is steam cleaned. Such equipment includes, but is not <br /> Iimited to, augers, bits, drilling rod, samplers, and brass sampler liners. <br /> Additionally,between sampling intervals,the sampler is thoroughly cleanzd with <br /> r, a dilute trisodium phosphate solution and rinsed with clean tap water or distilled <br /> water. <br /> 3) Each exploratory boring is drilled with a truck-mounted drilling rig using either <br /> solid flight or hollow stem augers. The boring is advanced to the desired <br /> f sampling depth and the sampler is lowered to the bottom of the ho',e. The sampler <br /> r is driven a maximum of 18 inches into the undisturbed soils ahead of the auger by <br /> a 140-pound, rig-operaied hammer falling 30 inches. The mamber of blows <br /> required to drive the sampler the final 12 inches is recorded on the boring log. <br /> When necessary, the sampler may be pushed by the drill rig hydraulics. In this <br /> case, the pressure exerted (in pounds per square inch) is recorded. After the <br /> i- sampler has penetrated the full depth,it is retrieved to the surface. <br /> 4) The samplers commonly used are either a California modified sampler (3 inch or <br /> 2.5 inch O.D.) or a standard penetrometer (2 inch O.D.). The standard <br /> " penetrometer does not contain sample liners and is used to determine soil strength <br /> characteristics and visually characterize the subsurface materials.If samples are <br /> collected for laboratory analysis the California modified sampler,equipped with <br /> brass liners,is used except when the analysis will include copper or zinc. In this <br /> instance,the sample should be taken with the <br /> P standard penetrometer and laced in <br /> Pe P <br /> a labeled plastic bag. <br /> Upon retrieval, the sampler is disassembled into its component parts. One or <br /> more of the liners is selected for chemical analysis. The ends of the selected <br /> liner(s)are sealed with aluminum foil or teflon tope,capped with plastic caps <br /> EXCELTECH,INC. <br /> Soil Sampling Protocol <br /> Latest Revision: March 28, 1990 <br />