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Potable Water System Master Planning and Implementation
City of Chubbuck, Idaho
OVERVIEW
Keller Associates has provided master planning, design and consulting
services for the City of Chubbuck’s potable water system for
many years. These projects have involved the development of potable
water wells; design of post-tensioned concrete storage reservoirs;
creation of a new upper pressure zone; and implementation of water
treatment facilities and major water transmission pipelines.
CHALLENGE
As the City of Chubbuck has grown, the demand for potable water supply,
storage, and good quality water has become a significant challenge.
The City’s water supply consisted of three wells, two of which
were contaminated with PERC at levels above safe drinking water limits.
Also, as growth has spread up the bench area to the east and toward
the ground level reservoirs, bench area pressures during high summer
use periods typically dropped below standards.
SOLUTION
Faced with the possibility of taking two of the major water supply
wells offline because of PERC contamination, and dealing with low
pressures in the east bench area plus an overtaxed water supply system,
the City authorized Keller Associates to proceed with implementation
of master planning, concept development, and implementation of potable
water system upgrades to resolve these problems. One contaminated
2,500 gpm well was retrofitted with an air stripping tower and a
variable frequency drive booster pumping facility. In addition, a
new 3,500 gpm well facility and major transmission lines were implemented
to provide additional water supply, thus allowing the City to remove
the remaining PERC-contaminated well from the system. The east bench
area pressure problems were resolved by the design and construction
of a new 4,500-gpm booster pumping facility and the creation of new
upper pressure zone. All of the potable water system facilities are
now controlled by a SCADA control system that provides control and
monitoring of the well pumps, air stripping facilities, booster pumps,
and reservoirs. |
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