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SRP requested that Logan Simpson conduct a Class 111 cultural resources inventory of 1,946 acres within Mine Areas J-19, J-21, and N-11 Extension South in Peabody Western Coal Company's, Kayenta Mine Complex (KMC). This is part of a larger environmental impact study (EIS) for the continued operation of the Navajo Generating Station (NGS) and the KMC from December 23, 2019 to December 22, 2044. Reclamation is the lead federal agency, and the BIA and OSMRE are cooperating agencies. Re-permitting of the NGS-KMC is a federal undertaking and must comply with Section 106 of the National Historic Preservation Act. A cultural resources inventory is required under 36 CFR § 800 (as revised in 2004), the regulations implementing Section 106 of the National Historic Preservation Act. SRP requested that Logan Simpson conduct a cultural resources inventory of PWCC Mine Areas J-19, J-21, and N-11 Extension South and record any cultural resources encountered to current standards and prepare National Register of Historic Places (NRHP) recommendations for each site. Logan Simpson was also tasked with evaluating the NRHP of six sites recently recorded in the mine areas.