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ATTACHMENT C <br /> SECOR INTERNATIONAL INCORPORATED <br /> FIELD AND LABORATORY PROCEDURES <br /> STANDARD PROCEDURE FOR <br /> HOLLOW STEM AUGER DRILLING <br /> Prior to drilling, all boring locations are marked with white paint or other discernible marking and <br /> cleared for underground utilities through Underground Service Alert(USA). In addition,the first <br /> five feet of each borehole are drilled with a hand auger or posthole digger to evaluate the <br /> presence of underground structures or utilities. <br /> Once predrilling efforts to identify subsurface structures are complete, precleaned hollow stem <br /> augers(typically 8 to 10 inches in diameter)are advanced using a rotary drill rig for the purpose <br /> of 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, <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 finish 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 /> USCS. <br /> All soil cuttings are temporarily stored on-site in 55-gallon DOT approved drums pending <br /> 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 /> • Standard Procedure for Equipment Decontamination <br /> STANDARD PROCEDURE FOR <br /> EQUIPMENT DECONTAMINATION <br /> All equipment that could potentially contact subsurface media and compromise the integrity of <br /> the samples is carefully decontaminated prior to drilling and sampling. Drill augers and other <br /> large pieces of equipment are decontaminated using high pressure hot water spray. Samplers, <br />