FLOOD09585

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: 1999 Flood Documentation Report ‎(SOQ)‎
• Date: 6/14/1999
• Prepared For: State of Colorado
• Prepared By: HDR Engineering, Inc.
• Floodplain - Doc Type: Miscellaneous

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WELD COUNTY

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CITY OF EVANS - WASTEWA TER TREA TMENT PLANT

HDR provided design and construction
administration services to the City of Evans for
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the upgrade and expansion of the City's
Wastewater Treatment Facility. The capacity
of the upgraded treatment facility is 1.2 mgd.
The Evans wastewater treatment facility is an
aerated lagoon type facility. The system
upgrade included addition of new surface
mechanical aeration equipment, construction of
a new headworks and pumping facility, and the
addition of a new administration/maintenance
building. The new surface mechanical aerators
supplement existing aeration equipment to
increase the oxygen supply and therefore the
organic capacity of the treatment system. The
new headworks includes flow measurement,
influent screening, and raw wastewater
pumping. The three new wastewater pumps
are mounted above the wetwell to allow easy
access for maintenance. The new headworks is
enclosed in a concrete block building and an
engine driven electric generator is provided to
assure a reliable power supply to the facility.
The administration/maintenance facility is
physically separate from the headworks building and includes offices, a lunch room/conference
room, restrooms, a water quality laboratory, and three large maintenance bays for equipment
maintenance.

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Date: June 1999
Client: City of Evans
Net Fees: $150,000
Location: Evans, CO

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1999 Flood Documentation Report
HDR Engineering, Inc.

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