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