Pike-San Isabel National Forests, Hazardous Fuels Management

Since 2009, ERO has completed more than 70,000 acres of cultural resource inventory in support of hazardous fuels management. ERO used GIS modeling and prior experience to develop survey strategies for each project. The projects have resulted in the documentation of more than 500 cultural resources, including prehistoric archaeological sites, historic settlements, mining complexes, transportation networks, timber extraction sites, recreation sites, World War II training sites, and federal work program sites.

Ignacio Cemetery Mitigation

On behalf of the Ignacio School District and the La Plata County Coroner’s Office, ERO completed the exhumation, analysis, and reburial of 21 individuals identified within a previously unknown historic cemetery. The 21 individuals were found to have been interred in a historically abandoned cemetery within the boundaries of the Southern Ute Indian Reservation.  ERO used geophysical methods and mechanical excavation to identify unmarked graves.  All individuals and associated funerary objects were subject to analysis before being reburied under the direction of the Southern Ute.

Arkansas Valley Conduit

ERO completed an exhaustive cultural resource overview, location predictive model, and sample survey in support of an environmental impact statement prepared on behalf of the Bureau of Reclamation.  The project proposes a 240-mile water pipeline from Pueblo Reservoir to Lamar and outlying communities along the Arkansas River.  Subsequent work required survey of geotechnical locations and ERO is ready to begin the remaining work, including the cultural resource and additional geotechnical locations surveys.

Rocky Mountain National Park

ERO has assisted the National Park Service (NPS) by completing cultural resource surveys and environmental assessments in support of Section 106 and NEPA compliance. In 2014 and 2015, surveys were completed in support of: an EA analyzing the effects of trail reroutes and rehabilitation following the 2013 catastrophic floods; an EA analyzing the effects of rehabilitating Sprague Lake, including cultural resource documentation and treatment of adverse effects to original features prior to rehabilitation; 37 miles of multiple trails prior to repair work - thirty new or previously documented cultural resources were evaluated, including prehistoric archaeological sites and historic trails; conditional assessments of cultural resources affected by the Fern Lake wildland fire; a trail survey and documentation of the Flattop Mountain Game Drive - the largest known aboriginal system in the Southern Rocky Mountains.  

Douglas County Community Development

ERO assisted Douglas County by conducting an assessment and sample reevaluation of all known archaeological sites on county-owned property.  Douglas County required the inventory to assess the effects of past and current impacts and to consider measures to avoid and preserve such properties from future impacts.  A total of 56 archaeological sites were revisited and reevaluated for significance.  As part of the planning process, ERO provided recommendations for further work, including stabilization and protection measures.

Beckwourth to Clover Valley Road Project

Beginning in 2009 with a Section 106 compliance assessment and ending in 2015, ERO completed cultural resource documentation, evaluative testing, treatment plans, and archaeological data recovery in support of a Federal Highway Administration (FHWA) project on the Plumas National Forest in California.  ERO completed historic resource documentation of a railroad grade, a visual assessment of a historic working ranch, and the data recovery of a prehistoric archaeological site and a historic lumber mill.

Resilient St. Vrain Project

ERO, under contract to CH2M Hill and the City of Longmont, completed a cultural resource survey of three reaches of St. Vrain Creek that were damaged during the 2013 catastrophic flood. The project was completed in advance of FEMA funding and a U.S. Army Corps of Engineers permit to restore and enhance nearly 9 miles of river corridor.  ERO surveyed nearly 1,800 acres and documented 58 cultural resources, including segments of railroads, ditches, and transmission lines and historical buildings and structures.

The Canyons Planned Development

Since 2005, ERO has assisted Alpert Companies with navigating the Section 106 compliance process with the Corps.  In 2015, ERO completed cultural resource survey and evaluative testing within the 1,553-acre development, including a nearly 5-mile-long sanitary sewer line. ERO documented 60 historical and prehistoric archaeological sites, as well 12 sites subject to evaluative testing, to determine the horizontal extent of subsurface cultural deposits. ERO is currently developing a treatment plan for eligible and needs data sites affected by the development and sanitary sewer line.

Western Area Power Administration

Since 2013, ERO has provided cultural resource services under a blanket purchase agreement with Western. Projects to date have included cultural resource survey in Nebraska and Colorado and monitoring projects in Colorado and Arizona. Notable projects have included the North Park-Terry Ranch Road 230-kV transmission line and access road survey and the archaeological documentation and monitoring of the Kayenta-Navajo segment of the Glen Canyon-Shiprock 230-kV transmission line.