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CNAPTERFOUR Responses to Public and Agiency Comments Letter and Comment No. Response F-4.2 The nearest Class I and sensitive Class II azeas, along with their approximate distance from the proposed project and identiification of the Federal Land Manager, aze: • Flat Tops Wildemess Area - Class I 65 km IJSFS • Dinosaur National Monument - Class II 58 km IdPS • Colorado National Monument -Class II 67 km IMPS The Mazoon Bells Class I Wildemess Area is approximat<;ly 80 km from the Pazachute Site. This has been coaected in the text. Tt~e analysis presented in the Draft EIS, and the response to Commeat F-4.1 indicate that the impact at the Flat Tops Wildemess Area is small, and it is expected that impacts would be even less at the Mazoon Bells. The Mazoon Bells is located an additional 15 km distant from the closest part of the project, in the southeasterly direction, on the other side of several mountainous temdin features, and is over 1001an from the Piceance Site. F-4.3 As indicated in the response to Comment F-4.1, the analysis using CALPUFF/CALMET has been completed using the Mt. [:irkel IMPROVE monitoring data as decided during the November ] 0, 1999 meeting. F~.4 The trona industry uses a process that oRen brings petroleum-bearing shale deposits to the surface with the trona ore. In a response from the trona industry, emissions of volatile organic compounds (VOCs) occur during the trona mining process. The trona process also can expose this petroleum-bearing material to high heat in a calciminer. Studies by the trona industry have indicated some VOC emisstons from these processing operations. BLM lease stipulations would require that oil shale hydrocarbons not be decomposed by the mining process and converted to vapors and/or liquids. Based on recent analyses, the project has quantified potential hydrocarbon (VOC) emissions from the wellheai gas separators, the stripper system, and the combustion sources to be 38._~ tpy. This level was calculated using conservative assumptions and the maximum production rate of 1.4 million tpy. The CDPHE-Air Pollution Control Division has proposed requiring quarterly monitoring of VOCs and hazardous air pollutants (HAPs), such as benzene, toluene, ethyl benzene and xylene or BTEX, from the process stream as part of their air pollutant emissions operating permit. • Based on a review of the current (but insufficient) documentation and research of potential visibility impacts in urban areas due to secondary organic aerosols, such as the Los Angeles, California, bas~m studies of Pandis, et al. (1992) and Grosjean (1984, 1985), rural western Colorado is 4-16