Laserfiche WebLink
Prince Albert Mine 110(d) Permit Application Exhibit U - EPP <br />construction plan will be reviewed and certified by a professional engineer and submitted for approval to <br />the DRMS prior to the modification being implemented. Additional quality assurance / quality control <br />measures are discussed in the SWMP included as Attachment U.8.1 to Exhibit U, Appendix A. <br />U (8.c.1) Surface Water Containment and Diversion Structure Construction - Critical Phases <br />The following construction phases and review criteria are considered critical to the proper performance of <br />all surface water containment and diversion structures: <br />✓ Diversion Swale bank height and channel width (review at completion). <br />✓ Rip -rap size and placement (review of rip -rap during material and size gradation and at <br />completion of placement). <br />✓ Pond bank height and width (review of footing installation and bank at completion). <br />✓ Pond overflow and spillway construction (review of erosion - control geotextile during <br />installation and rip -rap at completion). <br />✓ Silt fence and excelsior installation practices (review of installation procedure and initial <br />installation process, final review at completion of each segment installed). <br />U (8.d) Reclamation of Surface Water Diversions and Detention Ponds <br />The surface water run -on and runoff diversion swales and the three detention ponds will be recontoured <br />during final reclamation, with post - reclamation maximum side slopes that will not exceed 3H:1V for the <br />ponds and 4H:1 V for the diversion swales. The surface water diversion swales will be covered with <br />topsoil and seeded after re- grading, remaining in place to divert surface water around to reclaimed waste <br />piles and ore stockpile area after reclamation is complete. The ponds will remain in place after the initial <br />phase of mine closure and reclamation to control runoff in the vicinity of the reclaimed waste piles. The <br />ponds will then be graded to conform to the surrounding surface contours, covered with growth medium, <br />and seeded once vegetation has been established on the reclaimed waste piles and ore stockpile area. <br />U (8.e) Surface Water Quality and Monitoring Plan <br />All of the surface water drainages in the vicinity of the mine site are ephemeral. The nearest receiving <br />water then becomes the San Miguel River, which lies approximately one mile to the north. The water <br />quality standards (Regulation 35 Table Values) for the applicable river segment are listed in Table U.8.1 <br />"San Miguel River Segment 5 Water Quality Standards," which will be used as the comparative standards <br />for any surface water monitoring that may be performed at the mine site. <br />The surface water monitoring plan is included as Attachment SWM to the SWMP, which is Exhibit U, <br />Appendix A, Attachment U.8.1 "Prince Albert Stormwater Management Plan" to the EPP. The <br />monitoring plan is a requirement under Stormwater Discharge Permit COR040247, issued by the State <br />Water Quality Control Division. <br />Rimrock Exploration & Development Page 30 of 39 <br />