Underground Construction - April 2021 - 26

Collaboration Secures the Success of Rehab Bypass Project
The three pump locations each had a
specific number of pumps and pump sizes to
allow the bypass to achieve the correct flow
rate. Each pump was set in containment
berms to lower the risk of environmental
impact, and they were connected via an
auto dialer capable of calling PWC, Crowder
Construction and Sunbelt Rentals in the
event of an emergency.
Pump Location One included six, 18inch Quiet Flow Diesel pumps, three of
which were primary and three backups,
to accomplish the required flow rate of
18,750 gpm. There was also one standby
pump. Each pump was self-contained with
environmental skids to contain 120 percent
of the on-board fluids. Combined, the
primary pumps were capable of producing
25,000 GPM, above the GPM required.
Pump Location Two was set up similar
to location one, with the exception of
smaller pumps and fewer backup pumps.
It included four 18-inch Quiet Flow
Diesel pumps designed to provide a flow
rate of 12,500 gpm, with two backups. A

standby pump was also added.
Both pump locations one and two included a suction location with independent
HDPE SDR 17 suction tubes, 24-inch HDPE
SDR 17 for location one and an 18-inch
HDPE SDR 17 for location two, placed in
the manholes. Each pump utilized independent HDPE SDR 26 discharge piping, which
will be connected through a 36-inch barrel
manifold with 18-inch flanges in and 24inch flanges out, exiting into the 24-inch
HDPE SDR 26 main discharge line.
Each manifold connection included an
18-inch knife gate valve to allow for independent isolation of each of the pumps. In
case of pump failure, the pumps could be
removed while under bypass and a backup
one set up. At the suction location, the
pumps were discharged into 24-inch HDPE
SRD 26 discharge piping.
Pump Location Three was located at a
manhole, where it was necessary to install
a 12- to 24-inch sewer plug in the downstream invert to create a wet well. There
were also two, 6-inch diesel trash pumps

installed to achieve 2,083 gpm, with one as
the primary and the other as backup.
The teams also installed a backflush line,
so the pump station could back flush waste
that was not collected back into the sewer
line. This allowed it to be regenerated to
clean drinking water.
The path to success with the Cross Creek
WRF Influent Pump Station rehabilitation was thoroughly a group effort. It
required ongoing communications between
stakeholders and plan revisions to ensure
every scenario was covered to complete
a safe bypass. The result was a relatively
short timeline for completing the project.
Planning began in February 2019 and the
project was completed, including breakdown, in October 2019.
With these improvements, the station is
now functioning effectively and safely. *
FOR MORE INFORMATION:
Crowder Construction, (800) 849-2966,
crowderusa.com/
Sunbelt Rentals, (800) 667-9328,
sunbeltrentals.com

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Underground Construction - April 2021

Table of Contents for the Digital Edition of Underground Construction - April 2021
