Underground Infrastructure - May 2023 - 29

REHABTECHNOLOGY
Ice Pigging Offers Low-Risk, High-Performance
Option for Water System Cleaning
Jeff Awalt | Executive Editor
Park City, Utah, site of the 2002 Winter Olympics, is a
7,000-foot-high scenic wonder known for its sweeping mountain
vistas, luxury homes and ski resorts, but its origins are literally
more down to earth.
A century and a half ago, Park City was the site of a silver
mining boom that made fortunes for some of its earliest residents
as more than 300 mines were burrowed into the craggy
Wasatch mountains surrounding the small town.
Reminders of those early days are evident on Park City's
historic Main Street, but not all the remnants of its mining heritage
are visible on the surface. Today, its 8,500 residents rely
on seven different sources of drinking water supply, including
deep tunnels excavated in the late 19th and early 20th centuries
to drain working mine shafts.
" When the miners went in to drill for ore, they kept getting
flooded out by water. They eventually drilled horizontal tunnels
and drained the water out, and that became the city's first
drinking water source, " said Michelle De Haan, water quality
and treatment manager for Park City Water Corporation. " And
those sources had a myriad of different metals in them, as you
would expect from a mining area. "
Those mineral-laden water supplies from sources such as
Spiro Tunnel create unique challenges for the team that manages
the municipal systems, from specialized filtration to pipe
cleaning. Substrates such as iron and manganese, common in
water systems, would accumulate on the interior of the pipe
walls, and then other metals that were part of Park City's mining
legacy - arsenic, lead and thallium - adhered on top of those.
" We work very hard to do things like our corrosion control
practice that helps keep those firm metal scales on the pipe
walls, " De Haan said. " We also have had a strategy of routinely
conducting high-velocity unidirectional flushing (UDF) in our
UndergroundInfrastructure.com | MAY 2023 29

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Underground Infrastructure - May 2023

Table of Contents for the Digital Edition of Underground Infrastructure - May 2023

Underground Infrastructure - May 2023 - 1
Underground Infrastructure - May 2023 - 2
Underground Infrastructure - May 2023 - 3
Underground Infrastructure - May 2023 - 4
Underground Infrastructure - May 2023 - 5
Underground Infrastructure - May 2023 - 6
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Underground Infrastructure - May 2023 - 18
Underground Infrastructure - May 2023 - 18A
Underground Infrastructure - May 2023 - 18B
Underground Infrastructure - May 2023 - 18C
Underground Infrastructure - May 2023 - 18D
Underground Infrastructure - May 2023 - 19
Underground Infrastructure - May 2023 - 20
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