SGM Expands Environmental Services through MountainWest Acquisition

SGM is excited to provide enhanced environmental services to Western Slope clients and communities through the acquisition of MountainWest, LLC. Principal MountainWest staff Eric Petterson and Alex Nees have strong reputations for providing high-quality wetland delineation, 404 Clean Water Act permitting, biological assessments, NEPA evaluation, and Endangered Species Act (ESA) compliance consulting to a variety of public and private entities, including oil & gas and mining companies, federal agencies, ski resorts, counties, municipalities, and private developers. We think you’ll find their dedication to high-quality service and long-term client relationships is right in line with the SGM way of doing business.

“We really see the addition of Eric Petterson and Alex Nees as a huge win for SGM clients,” says SGM President Warren Swanson, PE. “The need for environmental analysis, permitting and consulting services in our opinion will continue to grow as Western Colorado faces greater environmental pressure from future growth and regulatory changes. Eric and Alex’s skillsets are a great complement to our current environmental team and will allow SGM to continue to provide engineering and consulting services to match our clients’ ever-changing needs.”

Get to Know Eric and Alex

Eric Petterson

Eric Petterson, MS has 18 years of environmental and ecological consulting experience in addition to 10 years of experience with the US Forest Service. Eric specializes in ecological consulting, NEPA, natural resource planning and management, habitat management for multiple resource benefits, and targeted impact assessments. Eric is a certified USACE Wetland Delineator with extensive wetland permitting experience. He can be reached at 970.384.9017 or




Alex NeesAlex Nees, MS is a senior ecologist with a decade of experience in the private and public sectors, focusing on infrastructure and development projects on federal lands. He has extensive experience with multi-agency coordination for the design and approval of trails and recreation-based projects, specializing in biological assessments, wetlands and NEPA compliance. Alex also has experience from his time at the Bureau of Land Management, where he focused on lands and realty programs and fluid minerals projects. He can be reached at 970.384.9004 or


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