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0 SECOR INTERNATIONAL. INCORPORATED <br /> STANDARD PROCEDURE FOR <br /> HOLLOW STEM AUGER DRILLING <br /> Prior to drilling g, boring locations are marked with white paint or other discernible marking and <br /> cleared for underground utilities through USA In addition, the first five feet of each borehole are <br /> drilled with a hand auger or posthole digger to evaluate the presence of underground structures <br /> or utilities <br /> Once pre-drilling efforts to identify subsurface structures are complete, precleaned hollow stem <br /> augers (typically 8 to 10 inches in diameter) are advanced using a drill rig for the purpose of <br /> collecting samples and evaluating subsurface conditions Upon completion of drilling and <br /> sampling, the augers are retracted, and the borehole is filled with concrete, bentonite grout, or <br /> hydrated bentonite chips or pellets as required by the regulatory agency In areas where the <br /> borehole penetrates asphalt or concrete, the borehole is capped with an equivalent thickness of <br /> asphalt or concrete patch to match finished grade <br /> During the drilling process, a physical description of the encountered soil characteristics (i e <br /> moisture content, consistency, odor, color, etc ), drilling difficulty, and soil type as a function of <br /> depth are described on boring logs The soil cuttings are classified in accordance with the <br /> Unified Soil Classification System (USCS) <br /> Soil cuttings are temporarily stored on-site in 55-gallon DOT approved drums, or are stockpiled, <br /> 10 pending laboratory analysis, waste profiling and proper disposal A label is affixed to the drums <br /> indicating the contents of the drum, suspected contaminants, date of drilling, borehole number, <br /> and depth interval from which the contents were generated <br /> Related Procedures <br /> Standard Procedure for Soil Sampling - Split Spoon Sampling <br /> o Standard Procedure for Equipment Decontamination <br /> 1 <br />