Laserfiche WebLink
Standard Operating Procedure <br /> 1 . Pile Quantification/Qualification <br /> The extents of each pile will be determined prior to excavation. <br /> 1) Determine pile volume, horizontal footprint, and underlying natural grade. <br /> 2) Collect one sample per 10,000 tons of identified material for lab testing <br /> a. Test samples for ABA and SPLP <br /> b. First sample should be taken at a depth of at least 2-ft within the pile. <br /> c. Multiple samples should separated by at least 2-ft of distance. <br /> 3) Material that has an ABA> 20 will be considered inert. Material that tests with an ABA< 20 <br /> will be considered non-inert. <br /> 4) Produce short report of material quantity and quality and keep for records and for regulators <br /> Prior to any onsite disturbance, a surety will be placed with Park County for$28,000 per acre of <br /> anticipated disturbance. This amount is based on the approved CDRMS bond at the London Mine <br /> 110D. Park County will hold this surety until revegetation steps are complete. Then the surety will <br /> be reduced to$7,000 per acre, which will be maintained with Park County until revegetation <br /> success has been certified by Park County staff. <br /> 2. Excavation Procedures <br /> Material handling and sediment control are the priority environmental challenges. <br /> 2.1. Sediment Control <br /> 1) Prior to any material excavation, sediment control will be established around the perimeter <br /> of the pile. <br /> 2) Uphill of the pile a runoff diversion structure will be installed. This structure may be a ditch or <br /> berm. Ditch and berm will combine to provide at least 2-ft of depth from the top of structure <br /> for runoff. Runoff diversion structures will be capable of diverting the 10-YR 24-HR event <br /> around the waste pile. <br /> 3) Silts fences or similar sediment control structures will be placed around the downhill <br /> perimeter of the waste pile area. <br /> 4) Up to two entry/exit points may exist within the sediment control perimeter. <br /> Abandoned Pile SOP 1 0 Lewicki&Associates <br />