Delivering total client satisfaction is the foundation of all of our projects. Browse this section to learn about projects we have completed to help our clients achieve their site and portfolio goals. Narrow your search by service, market, or region to view our experience on sites similar to yours.

Solid Waste Management

Eden Valley Landfill and Transfer Station
Sweetwater County, Wyoming

Services Provided


Regulatory Agency Involved
Wyoming Department of Environmental Quality
Trihydro has been the prime consultant assisting the Eden Valley Solid Waste Disposal District (EVSWDD) with various solid waste management projects since 2006. Changes to their solid waste management system have been driven by Wyoming Department of Environmental Quality (WDEQ) concerns with existing groundwater monitoring data and limited remaining permitted disposal capacity at their unlined landfill. Additionally, the results of the integrated solid waste management (ISWM) plan prepared by Trihydro demonstrated that the continued operation of the landfill is not economically feasible.  

Initial project activities included a groundwater investigation and expansion of the groundwater monitoring network for the unlined landfill. Once a final decision was made to close the landfill, Trihydro designed, permitted, and constructed a new transfer station, and is assisting the EVSWDD with the operations contract. Most recently, Trihydro designed and permitted a water balance cover system for the 20 acre unlined landfill footprint. The water balance cover project included identification and characterization of a suitable borrow source, a vegetation survey, and extensive unsaturated flow modeling of various climatic conditions to demonstrate cover system performance. In conjunction with the closure permit application process, Trihydro facilitated negotiations with the WDEQ for a deferred closure schedule that will accommodate a large amount of debris from an upcoming school construction and demolition project.
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"The quality of Trihydro's work matches the exemplary nature of the individuals performing them."
- Guillermo J. Silva-Wiscovich, Partner, Morell Bauza Cartagena & Dapena LLC

Trihydro’s success is based on working safely, maintaining high quality, and having strong project managers on the front line. Our considerable technical and regulatory expertise allows us to anticipate challenges, recognize opportunities, and strategically work with you to reach well-defined milestones and clearly defined end-state visions.

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