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C <br />El <br />1) Review site proposal for boring locations and special instructions. Confirm <br />boring locations in field with client. Have Underground Service Alert (USA) <br />mark utilities in area prior to drilling. <br />2) Prior to initiating an exploratory boring, all equipment to be used during <br />drilling and sampling operation is steam cleaned. Such equipment includes, <br />but is not limited to, augers, bits, drilling rod, samplers, and brass sampler <br />liners. Additionally, between sampling intervals, the sampler is thoroughly <br />cleaned with a dilute trisodium phosphate solution and rinsed with clean tap <br />water or distilled water. <br />3) Each exploratory boring is drilled with a truck -mounted drilling rig using <br />either solid flight or hollow stem augers. The boring is advanced to the <br />desired sampling depth and the sampler is lowered to the bottom of the hole. <br />The sampler is driven a maximum of 18 inches into the undisturbed soils <br />ahead of the auger by a 140 -pound, rig -operated hammer falling 30 inches. <br />The number of blows required to drive the sampler the final 12 inches is <br />recorded on the boring log. When necessary, the sampler may be pushed by <br />the drill rig hydraulics. In this case, the pressure exerted (in pounds per <br />square inch) is recorded. After the sampler has penetrated the full depth, it is <br />retrieved to the surface. <br />4) The samplers commonly used are either a California modified sampler (3 <br />inch or 2.5 inch O.D.) or a standard penetrometer (2 inch O.D.). The <br />standard penetrometer does not contain sample liners and is used to determine <br />soil strength characteristics and visually characterize the subsurface materials. <br />If samples are collected for laboratory analysis the California modified <br />sampler, equipped with brass liners, is used except when the analysis will <br />include copper or zinc. In this instance, the sample should be taken with the <br />standard penetrometer and placed in 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 />EXCELTECH, INC. <br />Soil Sampling Protocol <br />Latest Revision: March 28, 1990 <br />