RESOURCE PLANNING
As part of our client-focused approach to environmental planning and compliance processes, ERO provides successful solutions to biological resource issues faced by our public and private sector clients. We conduct resource inventories and impact assessments, negotiate with regulators, develop mitigation plans, and monitor post-project conditions. Our knowledge of natural resource systems, and the associated regulatory processes, results in objective and defensible science-based solutions that we deliver with integrity.
Areas of Expertise
Natural resource management planning
Trail and recreation planning
Baseline inventory and assessment
ERO has completed dozens of baseline inventories and rapid resource assessments in support of conservation easement documentation and open space management planning. ERO’s biologists are well versed in mapping, categorizing, and managing vegetation communities and wildlife habitats.
Regional conservation planning
Management policy development
Public process and facilitation
Resource Planning Leads


Bill has a broad background in natural resource and open space planning, natural resource assessments, National Environmental Policy Act documentation, and water resource studies throughout Colorado and the intermountain West. He has a sound understanding of environmental and land use planning, natural resource policy, biological sciences, and GIS mapping. This interdisciplinary background of technical and professional skills has enabled Bill to effectively coordinate diverse project teams. Bill’s comprehensive approach to natural resource problems and issues enables him to develop workable and sustainable solutions.
"In presenting this Certificate of Appreciation we would like to thank Ron Beane and Bill Mangle of ERO for their hard work and diligence in writing and completing the HCP document. Without them the successful completion of this HCP would not have been possible."
- Steve Vandiver, General Manager, Rio Grande Water Conservation District, and Terry Ireland, U.S. Fish and Wildlife Service
Email: bmangle@eroresources.com


Aliina joined ERO in 2017, bringing with her considerable experience with the National Environmental Policy Act (NEPA). Aliina’s NEPA experience includes the preparation of categorical exclusions (CatExs), environmental assessments (EAs), and environmental impact statements (EISs) for transportation and energy development projects, including socioeconomic assessments. She also has experience with transportation studies, including long-range transportation plans and pre-NEPA planning efforts. Aliina is adept at working with a range of stakeholders, including multidisciplinary teams, the public, and governmental organizations.