Underground Construction - August 2020 - 20

With the goal of a centralized wastewater
system, the city of Prescott chose Hobas pipe
for its corrosion resistance and long life.

Contributing to Prescott's year-round
appeal are a vibrant pioneer history,
which began before the city became
a territory capital in 1864; outdoor
attractions from lakes to golf courses;
temperate climate; seasonal festivals;
and unique shopping venues.
With watchful eyes on the future,
city leaders have taken significant measures to update an essential part
of Prescott's infrastructure.

Growth spurs project need

Poised for Progress:
Prescott One Step Closer to
Centralized Wastewater System
Kimberly Paggioli, P.E. | Hobas Pipe USA

The popular adage "out with the old, in
with the new" is often associated with enthusiasm and fanfare. Yet, in the world of
sewer replacement and expansion, the true
test of a successful project is having the
work go almost unnoticed by the public.
Such is the case in Prescott, a central
Arizona desert city with a population of
more than 43,000, just 96 miles northwest
20

AUGUST 2020 | UConOnline.com

of Phoenix and a scenic, two-hour drive
from the Grand Canyon.
Prescott, the seat of Yavapai County, has
experienced a surge of residents, as well as
visitors, in recent years. According to the
World Population Review, the city is growing at a rate of 0.93 percent annually and
its population has increased 10.75 percent
since the most-recent census in 2010.

"The Airport Water Reclamation Facility
(WRF) Trunk Main Project was needed to
support the city's growth and is part of its
overall plan for centralization of the wastewater system to one treatment plant," said
Richard Poynor, P.E., vice president of
Lyon Engineering. "The project affects at
least 15 different properties - industrial,
residential and ranch land - and goes
through an existing right-of-way, underneath State Route 89A."
"We currently have two wastewater
treatment facilities," added Craig Dotseth,
director, City of Prescott Public Works.
"This pipeline will allow us to continue
on the centralization path to reduce
operations and maintenance costs for our
wastewater treatment system."
The selection of materials, made by
city engineers several years ago, included
Hobas centrifugally cast, glass-fiber-reinforced polymer mortar (CCFRPM) pipes.
"Hobas pipe was chosen because of its
corrosion-resistance capabilities, superior
joints to prevent infiltration and root
intrusion, and its life-cycle cost," noted Eric
Bay, P.E., manager, Prescott Utilities. "Over
the past three years, we've been installing
Hobas pipe in different phases of the
overall Airport Trunk Main Project."
Dotseth, a Grade 4 certified operator
in water treatment, water distribution,
wastewater treatment and wastewater
collection, pointed out the value of using
durable materials.
"When we are asked about the project,
what we've considered is that 100 years from
now, anyone who follows us in our jobs, in
our profession, will find this system will still
be there taking care of the city," he said. "The
entire gravity system that we're building is
completely corrosion-resistant - from pipe
to composite riser rings and covers."
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Underground Construction - August 2020

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