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Reference: Remediation Well Destruction Work Plan <br /> February 22,2018 <br /> Attachment 1 Field and Laboratory Procedures <br /> STANDARD PROCEDURE FOR <br /> WELL DESTRUCTION BORINGS <br /> Prior to drilling,all well locations are marked with white paint or other discernible marking and cleared for <br /> underground utilities through USA.In addition,any digging to be completed in the upper five feet around <br /> each well will be done using hand tools,or cleared with an air knife,to minimize any impacts to potentially <br /> unforeseen underground structures or utilities. <br /> Once pre-drilling efforts to identify subsurface structures are complete, pre-cleaned hollow stem augers <br /> (typically 8 inches in diameter)are advanced using a hollow stem auger drill rig for the purpose of removing <br /> the well materials. Upon completion of drilling, the augers are retracted and the borehole is filled with <br /> concrete,bentonite grout,hydrated bentonite chips or pellets as required by the regulatory agency.The well <br /> box and concrete apron are removed and the surface restored to match existing grade. In areas where the <br /> borehole penetrates asphalt or concrete,the borehole is capped with an equivalent thickness of asphalt or <br /> concrete patch to match finish grade. <br /> Soil and waste generated during the well destruction activities are temporarily stored on-site in 55-gallon, <br /> DOT approved drums pending waste profiling and proper disposal.A label is affixed to the drums indicating <br /> the contents of the drum and date the waste was generated. <br /> Related Procedures: <br /> • Standard Procedure for Equipment Decontamination <br /> ® Stantec <br /> 1 <br />