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2.OS APPLICATION FCI2 PII21~T F(1t SIIItFACE OR iII10I[ID MII~II~ ACIZVITIffi - MII~@S@I Rt7QDmIIgNPB ECR OPERATION ADID RDCLAFfATION PLAF~. i 2.OS.6 Mitigation o! sisfaoe Oxl Mining operation izppacts. (Cont'd.) (3) (b) (iii) (Cont'd.) Surface Water Monitoringt -Orchard Valley and Orchard Valley West Mine Sites Surface water monitoring at WVCC's orchard Valley and Orchard Valley West Mines includes quality and quantity measurement for dischaarges from disturbed lands. Specific parameters are measured in accordance with COVCC's NPDFS Discharge Permit at six NPDFS discharge points upon release of flows from the disturbed areas to a natural water course. The surface runoff from disturbed areas at the portals and support facilities throughout the property is totally contained within the existing sedimentation systems. Surface water is discharged and monitored at s~limentation porri #4 (outfall 002), the timber storage area car~i,~ntation pond (outfall 003) , the coal stockpile sedimentation pond (OUtfall 004), the train loadout sedimentation porn (Outfall 005), and the Orchard Valley West Mine sedimentation pond (Outfall 006). Refer to the NPDES Appendix in Volume 8A for specific information on the NPDES permit. Sedimentation pond #4 is equipped with a stilli~ well. Discharges over the spillway, in the case of flows in excess of a l0-year 24-hour event, are measured automatically in this well. Voluntary discharges from this pond are sampled and analyzed in accordance with the NPDFS Permit. The storage capacity of the sedimentation ponds at discharge points 003, 004, 005, and 006 results in infrequent discharges. Appropriate sampling analyses are cotxYucted in the event discharge occurs. Required NPDFS parameters include flow, total iron, total dissolved solids, total susperxled solids, and pH. Conditional analysis for oil and grease are also required if a visible sheen is evident on the discharge. Discharge Monitoring Reports (OMB's) are filed quarterly with the Division in accordance with Rule 4.05.13 (2) (a) (iii), and are available for inspection by the Regulatory Authority at the ~VCC mine site office. Any sanq~les which indicate a permit violation will be reported immediately to the Regulatory Authority. Surface water discharge monitoring will continue for such time as is deemed necessary after cessation of use of underground mine workings and after surface disturbed areas have been regraded and stabilized. All equipment for monitoring will be removed when it is no longer required for monitoring. Grourxhrater Monitoringt -Orchard Valley and Orchard Valley West Mine Sites The Orchard Valley and Orchard Valley West Mines are located several hundred feet above the water table of the area. The mines are designed to prevent toxic materials or leachates from contacting water sources. 'iR 93-24 Revised 12/10/93 114