and mini-waterfall grace front entrance gate.
view of plant from the west; I-5 is in background.
batch reactor (SBR) basin #3 with aeration blowers operating.
EnVessel pasteurization system in development, prior to wall
left: Conveyor belt of RDP EnVessel pasteurization system.
building, chemical feed building, and sludge holding tank under
batch reactor (SBR) basin wall under construction.
batch reactor (SBR) basin under construction.
W. H. Reilly & Co.
assists in development of
new Chehalis wastewater treatment plant
Gibbs & Olson, Inc., a Washington-based civil engineering
firm, relied on Wm. H. Reilly & Company to supply equipment and
provide ongoing support for the design and construction of a new wastewater
treatment plant for the city of Chehalis.
Reilly supplied the primary biological process systems and many of
the major treatment plant components, including:
Tech three-tank sequencing batch reactor (SBR) system, which
was selected over technologies that utilized fine-bubble diffusers
and floating mixers.
tertiary filter system, an innovative upflow continuous backwashing
sand-filter, with a strong, proven track record.
An RDP EnVessel
pasteurization system, in which dewatered sludge is blended with
lime and heated, creating an end product that meets Class A biosolids
standards. These biosolids are virtually pathogen free and may
be applied to land in the same way as commercial fertilizer.
Reilly also supplied a Siemens/RJ Environmental odor
control system, Swaby lobe pumps, and a Siemens/Stranco polymer system.
A careful, thorough selection process
The wastewater treatment plant equipment was selected after thorough
present-worth analyses that took into account capital costs, low long-term
operating costs, and durability. Plant operators also played a significant
role in selecting the appropriate equipment.
The new plant is capable of treating up to 3.5 mgd of wastewater to
Class A reclaimed water for irrigation and groundwater augmentation
and up to 13 mgd to secondary treatment standards for discharge to
the Chehalis River.
Initial planning for the plant began more than a decade ago; Reilly
was brought onto the project in 2002. The facility was completed in
October 2007 and has performed admirably. The plant was constructed
above the Chehalis River floodplain and remained fully operational
during floods in December 2007 and January 2009.
Reilly rated a 9 on a 10-point scale
Patrick Wiltzius, wastewater superintendent for
the city of Chehalis, says, “Reilly is far better than a lot
of other equipment suppliers we deal with. If I have to go to anyone,
I trust Reilly.
Tom Gower, Gibbs & Olson project engineer, says, “We’ve
established a relationship with Reilly over the years on a number of
projects, and having that relationship makes it nice. We call them,
they know us, and they’re able to pick right up on things. They
assisted us throughout the project start-up phase. They also worked
with us during the design phase.
“Their follow-up and responsiveness is
“On a scale of 1 to 10, I’d rate Reilly a 9,” says
Mike Marshall, Gibbs & Olson project manager. “We can always
call on them whenever we have issues. When we’re facing a problem,
they have many products and technologies to help us with.”
Gibbs & Olson earns statewide award
Gibbs & Olson maintains offices in Longview
and Olympia, and provides clients in western Washington and northern
Oregon with civil engineering, land surveying, and planning services.
The company was honored with an award--best in state for exceeding
client expectations—for its work on the Chehalis wastewater treatment
Gibbs & Olson was established in 1950 and has a long history
of improving quality of life and promoting economic development through
the planning and provision of essential infrastructure.