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原文传递 FINAL PROGRAMMATIC ENVIRONMENTAL ASSESSMENT: NATIONWIDE DIFFERENTIAL GLOBAL POSITIONING SYSTEM.

题名：	FINAL PROGRAMMATIC ENVIRONMENTAL ASSESSMENT: NATIONWIDE DIFFERENTIAL GLOBAL POSITIONING SYSTEM.
作者：	Chamberlain-JA; Burns-PL
关键词：	Alternatives-analysis; Environmental-impact-analysis; Global-Positioning-System; Land-use; Location-; Mitigation-measures; National-Environmental-Policy-Act-of-1969; Nationwide-Differential-Global-Positioning-System; Programmatic-Environmental-Assessment; Socioeconomic-factors; United-States
摘要：	As required under the National Environmental Policy Act of 1969 (NEPA), the Federal Highway Administration (FHWA) has prepared this Programmatic Environmental Assessment (PEA) to evaluate the potential environmental effects of a proposed U.S. Department of Transportation Nationwide Differential Global Positioning System (NDGPS). This PEA evaluates potential individual and cumulative impacts of the proposed action and alternatives on environmental, land-use, and socioeconomic resource areas. This PEA represents the first tier of environmental impact analysis. Subsequent NEPA analyses tiered to this PEA may be prepared when site-specific impacts cannot be avoided or mitigated as specified herein. A draft PEA was distributed to parties listed in Appendix D and was made available on the Internet for public review. A Notice of Availability was listed in the Federal Register between March 4 and April 2, 1999. Comments received regarding the draft PEA and FHWA responses to comments are provided in Appendix E. To expand existing DGPS capabilities nationwide, the installation of at least 67 additional reference stations with low-frequency transmit antennas is required. Three NDGPS deployment alternatives were considered. Alternative A would consist of the conversion of 32 Ground Wave Emergency Network (GWEN) relay nodes to NDGPS reference stations, transfer of GWEN equipment from remaining GWEN relay nodes or spare GWEN equipment sets to 28 new NDGPS site locations, and installation of 7 additional NDGPS sites using new equipment, for a total of 67 NDGPS sites. Alternative B would consist of installation of new equipment at 32 existing GWEN relay node sites and at 35 new sites; each reference station would be physically similar to those described under Alternative A. Alternative C would consist of installation of 80 to 100 new reference station sites using equipment similar to that at U.S. Coast Guard local area DGPS stations. The environmental impact of the no-action alternative was also considered. The potential for significant environmental impacts has been identified for each deployment alternative, including the no-action alternative. Under any of the proposed action alternatives, no significant environmental impacts will result provided that specific site-selection criteria and, if necessary, mitigation measures discussed in this PEA, are applied to each site proposed for installation of an NDGPS reference station. If, for some unforeseen reason, mitigation to reduce potentially significant impacts cannot be implemented at a specific site or a type of impact was not anticipated and addressed in this PEA, then additional NEPA analysis and documentation will be prepared for installation of an N$600
总页数：	1999/09. pp174 (22 Fig., 11 Tab., Refs., 5 App.)
报告类型：	科技报告