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Attachment TP4SDN1 <br /> Page No. TP4SDM -4 <br /> Permit No. CO-0044768 <br /> Description of Protect <br /> —The existing drainage path and ponding area will be shaped and graded to accept an invert liner <br /> (40 mil PVC) and to drain to\�ards an outlet culvert. This liner material %ill be covered with subsoil <br /> material to protect it and to allow vegetation to grow. Any disturbed areas will also be vegetated to <br /> muninuie erosion and sediment transport. <br /> —A 24 inch ADS (or other material acceptable to CDOT)will be placed to CDOT specifications to <br /> allow anv surface drainage collected to drain freely under Colorado Highway 110 to existing drainage <br /> paths. <br /> —Temporan sediment control measures will be used as necessary to minimize sediment transport <br /> from the site <br /> Anak sis <br /> Installation of structures and control of drainage to minimize the potential for water to contact <br /> tailings and mine waste material is a Best Management Practice. Any reduction in contact of mine <br /> waste or tailings All flowing water has the potential for reduction in metals loading to the Animas <br /> River <br /> The existing drainage and holding configuration is a remnant from the original design of Tailings <br /> Pond No. 4 \Nhen tailings sand was used for used for embankment material. Any runoff from this <br /> area had contacted tailings material and containment was a Best Management Practice for the <br /> configuration at that time. The pond embankment has since been capped with subsoil and vegetated <br /> thereby eliminating contact of surface runoff with tailings material. Allowing surface runoff to leave <br /> the area prior to percolation into the capped tailings material will serve to minimize contact of <br /> tailings material with flowing water and reduce any metals loading that may occur as a result of the <br /> contact Implementation of the work plan will not materially alter the land or create any land use <br /> changes or potentiol uses <br /> Monitors nQ <br /> Due to the close proximity to other Animas River monitoring stations and the high flows that occur <br /> in the Animas River. no additional monitoring is contemplated for this project. Improvements would <br /> be reflected in the monthh monitoring results from A-08 <br /> Budget <br /> SGC mll fund this protect <br />