Systems Applications Inc. was retained by the National Park Service to study the potential impact of light pollution from the proposed repository sites in Davis Canyon and Lavender Canyon. In this study night sky glow resulting from nightime operation of the proposed nuclear waste repository was calculated, and the potential for human perception of these effects was estimated. The study involved the following steps: development of a mathematical model of atmospheric optics to predict the nighttime sky-glow impacts of the proposed facility; verification of the model's prediction performance to the extent possible with existing data; Application of the model to the area surrounding the proposed facility, calculating results from several viewpoints within the park; (only the Upper Davis Canyon viewpoint is discussed in this paper). Estimation of the potential for human perception of the calculated night sky glow and the potential of the night sky glow to obscure starlight.