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Visibility Impacts for Class II Areas - An Assessment of Regulatory Obligations and Best Practices

机译：II类区域的可见性影响-监管义务和最佳实践的评估

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The additional impact analyses requirement of the Federal PSD Rules [40 CFR 52.21 (o)] is an often overlooked component of PSD applications. The additional impacts language in the PSD rules is very brief and unspecific, especially with respect to the requirement to analyze visibility impacts related to the PSD project. Over the years, regulatory authorities and applicants have addressed the visibility portion of this requirement by assessing project visibility impacts using "plume blight" models such as VISCREEN. However, this approach presents some issues. First, the language in paragraph (o) only states that an analysis should be provided, and does not specify any standards or thresholds with which to assess impacts. The use of models designed for use in Class I areas such as VISCREEN, and the visibility thresholds internal to that model, can mischaracterize the relevance of a project's visibility impact when applied for Class II areas. Second, regulatory authorities and applicants alike are often faced with a decision on where the assessment should be conducted: public lands such as parks and recreational areas are routinely chosen, but should these areas automatically be afforded what amounts to special protection during the PSD permitting process? This paper assesses a source's regulatory obligation to conduct visibility analyses to satisfy the unspecific requirements of paragraph (o). Recommendations are provided, including how to appropriately select an area for analysis and a review of available literature is documented to suggest alternative visibility criteria for plume perceptibility in Class II areas.
机译：联邦PSD规则[40 CFR 52.21（o）]的其他影响分析要求是PSD应用程序中经常被忽略的组成部分。 PSD规则中的附加影响语言非常简短且不明确，尤其是在分析与PSD项目相关的可见性影响的要求方面。多年以来，监管机构和申请人已经通过使用“虚拟枯萎”模型（例如VISCREEN）评估项目可见性影响来解决此要求的可见性部分。但是，这种方法存在一些问题。首先，（o）段中的措词仅规定应提供分析，没有规定评估影响所依据的任何标准或阈值。设计用于VISCREEN等I类区域的模型以及该模型内部的可见性阈值，在应用于II类区域时，可能会误判项目的可见性影响的相关性。其次，监管机构和申请人都经常面临在何处进行评估的决定：常规选择公园和休闲区等公共土地，但是在PSD许可过程中是否应自动为这些区域提供相当于特殊保护的保护？本文评估了源头进行可见性分析以满足（o）段非特定要求的监管义务。提供了建议，包括如何适当地选择要进行分析的区域，并记录了对现有文献的回顾，以为II类区域中羽流可感知性提出替代的可见性标准。

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