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Eagle River Water & Sanitation District
Edwards Wastewater Treatment Plant
Facility Plan & Expansion

Tetra Tech RTW produced an updated 201 facility plan for expansion to the existing plant. Work included existing treatment capacity analysis and an environmental Edwards Wastewater Treatment Plant Facility assessment including wetlands, floodplain, and water quality issues. Tetra Tech RTW coordinated with Eagle County, the Northwest Colorado Council of Governments, and the Colorado Department of Public Health & Environment (CDPHE) for plan approval. Tetra Tech RTW assisted CDPHE Outreach & Assistance Unit in the FONSI preparation and approval of the Water Pollution Control Revolving Fund Loan for the District. This involved presentations to the Eagle County Planning Department and the County commissioners with public comment response.

Construction of Edwards Wastewater Treatment Plant Facility A $16 million expansion of this 2.95-mgd nitrifying activated sludge facility began with a detailed predesign evaluation study, with considerable District staff input during several tours and workshops. Facilities included a 6.0-mgd raw wastewater lift station using two 54"-diameter screw pumps; a headworks building with advanced odor control, state-of-the-practice mechanical filter screens, grit classification, and grit dewatering; two new primary clarifiers; conversion of two existing aerobic digesters and two existing secondary clarifiers to aeration basins and modifications to the existing aeration basins; two new 60'-diameter secondary clarifiers; rotary drum thickening and polymer facilities; and ATAD biosolids processing and high-solids centrifuge and dewatered cake conveyance system.

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Engineering Services