The Bureau of Indian Affairs Navajo Region awarded a purchase order to DDC 4C, LLC for $421,464.84 on September 24, 2026, to conduct a vegetation survey and rangeland inventory of District 10 South. The order is set aside for Indian Small Business Economic Enterprises; DDC 4C is a tribally-owned, SBA 8(a)-certified small business. Performance occurs in Chinle, Arizona, covering 458,435 acres across Sub-Units 10-1 (Cottonwood) and 10-4 (Nazlini) on BIA Navajo Partitioned Lands. The contractor will collect and compile vegetation data from 534 study plots using double sampling methodology, deliver a technical report with GIS analysis using ArcGIS Pro 10.4.1, and provide field data, spreadsheets, and shapefiles. The period of performance runs September 28, 2026, through December 31, 2027. Service Contract Act wage determination 2015-5477 (Arizona) applies.