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Equipment Decontamination <br /> Equipment that could potentially contact subsurface media and compromise the integrity of the <br /> samples is carefully decontaminated prior to drilling and sampling. Drill augers and other large pieces <br /> of equipment are decontaminated using high-pressure hot water spray. Samplers, groundwater pumps, <br /> liners and other equipment are decontaminated in an Alconox scrub solution and double rinsed in clean <br /> tap water rinse followed by a final distilled water rinse. <br /> The rinsate and other wastewater are contained in 55-gallon DOT-approved drums, labeled(to identify <br /> the contents,generation date and project)and stored on-site pending waste profiling and disposal. <br /> Soil Cuttings and Rinsate/Purge Water <br /> _- Soil cuttings and rinsate/purge water generated during drilling and sampling are stored on-site in DOT- <br /> approved 55-gallon steel drums pending characterization. A label is affixed to the drums indicating the <br /> contents of the drum,suspected contaminants,date of generation,and the boring number from which the <br /> waste is generated. A licensed waste disposal contractor removes the drums from the site to an <br /> appropriate facility for treatment/recycling. <br /> Workplan for Decommissioning Monitoring Well MW-4 <br /> SOMA Environmental Engineering, Inc. <br />