2010-09-13_HYDROLOGY - M1981185 (2)

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Inspection Report Page 4 of 5 c. New portal at approximate location of historic "Chief" portal The date industrial activities commenced at this location is not definitively known, but prior to the 6/3/2010 inspection conducted by the Division of Reclamation, Mining and Safety (see Attachment Q. Specific industrial activities observed during the inspection included a newly constructed access road and portal, which serves as a secondary escape way for May Day No. I (Level 1). Material generated from this activity was deposited adjacent to, and in, Little Deadwood Gulch (see attached photographs 9, 10, and 11). (See also photographs 8, 9, 10, 13, and 14 in Attachment C [DRMS inspection report]). The new access road and portal is located immediately adjacent to Little Deadwood Gulch. Stormwater runoff from the access road and portal disturbance flows downgradient to Little Deadwood Gulch (State waters - tributary to the La Plata River). 4. It was noted during the inspection that BMPs were not implemented to manage stormwater runoff from pollutant sources, including disturbed areas, associated with the May Day No. 1 (Level 1); May Day No. 2 (Level 2); and the Chief portal industrial activities. Specific locations and deficiencies are identified below. a. May Day No. I (Level 1) site i. It was noted during the inspection that BMPs were not implemented to prevent transport of pollutants from a waste rock pile at the site to Little Deadwood Gulch or to the La Plata River. Water contacting the waste rock was observed moving downgradient toward the road entrance to the facility (see attached photograph 1). Stormwater that contacts waste rock is subject to Federal Effluent Limitation Guidelines, and cannot be discharged under a stormwater discharge permit. Stormwater runoff from this site flows downgradient off the edge of the site, along the path of the access road, or off the edge of the access road, to either Little Deadwood Gulch (State waters - tributary to the La Plata River) or to the La Plata River (State waters). As a result, there was a potential for the transport of pollutants from the waste rock pile to Little Deadwood Gulch and the La Plata River. The Division expects Wildcat Mining Corporation to implement BMPs to prevent contact of stormwater with this pollutant source (i.e., run-on control and cover), or discharge this water in accordance with the requirements, terms and condition of an individual CDPS permit for this facility. ii. It was noted during the inspection that BMPs were not implemented to prevent transport of pollutants from equipment at the site to Little Deadwood Gulch or to the La Plata River. Specifically, the ground under the compressor at the site was stained with fluid from the equipment (see attached1)hotograph 2), and BMPs were not implemented to prevent contact of stormwater with this pollutant source, or to remove the stained area. Stormwater runoff from this site flows downgradient off the edge of the site, along the path of the access road, or off the edge of the access road, to either Little Deadwood Gulch (State waters - tributary to the La Plata River) or to the La Plata River (State waters). As a result, there was a potential for the transport of pollutants from the stained ground area to Little Deadwood Gulch and the La Plata River. The Division expects Wildcat Mining Corporation to implement BMPs for this pollutant source (i.e., run-on control and spill response BMPs) to prevent the discharge of the spilled material from the site to State waters. iii. It was noted during the inspection that BMPs were not implemented to prevent erosion and sediment transport from disturbed areas associated with the site (cut slopes, fill slopes and site surfaces), to Little Deadwood Gulch and the La Plata River. Specifically, BMPs were not implemented to prevent run-on to the cut and fill slopes, to stabilize the slopes, or to prevent the discharge of sediment from the disturbed slopes to State waters. Additionally, BMPs were not implemented for disturbed surfaces within the site to stabilize the surfaces or prevent the discharge of sediment mobilized from site surfaces to State waters (see attached photographs 3 through 5). Stormwater runoff from this site flows downgradient off the edge of the site, along the path of the access road, or off the edge of the access road, to either Little Deadwood Gulch (State waters - tributary to the La Plata River) or to the La Plata River (State waters). As a result, there was a potential for the transport of sediment from the site