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No additional impacts are anticipated to the eagle nest in the area or upon wintering bald eagles in the valley. No impacts to endangered or threatened wildlir`e species are projected. Aquatic Biology There vrould be no additional impacts upon aquatic or riparian habitats, other than the possibility that increased temporary sedimen- tation could result if a large ston,~ occurred before the crainaae system was completed for the vent shaft, access road, and refuse disposal area. Cultural Resources • Prior to any surface disturbing activities, an archeological clearance is required in potential impact areas (as supported by 1G66 Historic Preservation Act as amended, 36 CFR 800, and FE0 11593) to identify, evaluate and nitigate possible damace to er,istinc cultural values. Should siies rea,ain undetected by the survey, sui-face dis- turbance from construction, subsidence, and other mine related activities could result in the displacement and da~-aoe of cultui"al values. Should C41I be ar.~arded the lease, i.6 acres ti•:ould be distr.^-bed by ~25 cu° to the construeion of an access road and vent shaft. Subsidence, as it could affect 20J acres, couid create surface disturbanczs '+;hich could displace and destroy cultural resources. The presence of nine-associated ti•rorkers on the lease area ~,vould expose cultural resources to public passage, increasing the potential for vandalism and illegal collecting. Transportation There r,~ould be no additional transportation impacts ether than these te~~~porary i~~~pacts due to hawing vent shaft refuse to a refuse disposal area. Use of Stevens Gulch road and Highway 133 by mine-related traffic would be extended fora period of 8 years. Employee traffic is not expected to increase during that period, but as production increases from 435,000 tons in 1978 to 700,000 tons per year in 1980 and L 85, truck traffic would increase from 17,000 truck trips per year to 23,000. In addition, the proposed action would increase truck traffic along the Stevens Gulch road temporarily as 45,000 cubic yards of waste is hawed from the ventilation shaft to the refuse disposal area. Visual Resources There would be no additional visual impacts since most of the necessary facilities are in-place. The vent shaft wo w d not be visible from major high.,ays near the site and the access road t•rould be extended from already existing exploratory drilling roads. •