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West Jefferson County Metro District
Wastewater Facility Masterplan & Treatment Plant Expansion

Tetra Tech RTW worked with the District to determine the most feasible expansion scenario for the existing extended-aeration activated sludge plant. Advanced treatment comprised chemical feed for phosphorus removal and deep-bed filtration. Plant site area and access was limited and factored heavily in the alternatives analysis. Work included preparing a facility masterplan, performing a CPE on the plant, outlining a phased expansion program, and assisting with the site application process and public information program.

Tetra Tech RTW designed expansion of the plant to a peak-hour capacity of 1.6 mgd. Features included a UV disinfection system, modification of the existing package plant to provide anoxic zones and contact stabilization capabilities, two new dome-covered secondary clarifiers, a RAS/WAS pumping chamber, new blowers for the aeration basins, a nonpotable water system, and operations building upgrades. The biosolids handling facilities expansion included new sludge pumps, a rotary drum thickener, and two-cell aerobic digesters with aeration equipment located under a District vehicle maintenance facility. Tetra Tech RTW also designed an earthen biofilter to control odors from both the headworks and biosolids buildings.

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Consulting Services
water, wastewater, environmental, civil, electrical, engineering, engineer, consulting, consultants, Colorado, Denver, Tetra Tech RTW, Rothberg, Tamburini, Winsor, West Jefferson County Metro District Wastewater Facility Masterplan, Treatment Plant Expansion, District, extended-aeration activated sludge plant, chemical feed, phosphorus removal, deep-bed filtration, UV disinfection system, anoxic zones, secondary clarifiers, RAS/WAS pumping chamber, blowers, nonpotable water system, biosolids handling, sludge pumps, rotary drum thickener, two-cell aerobic digesters, earthen biofilter, odors, headworks, biosolids buildings,