By Bay Stephens EBS LOCAL EDITOR
BIG SKY – At their July 16 meeting,
the Big Sky Water and Sewer District board chose the final layout for the
wastewater treatment plant upgrade. The undertaking will require excavation and
landscaping to lower and conceal the planned headworks building that will be
nearest Big Sky Community Park, diminishing the risk of it becoming an eyesore
to park goers.
“This is a critical path vote you
just did,” said Ron Edwards, BSWSD general manager during the meeting. “We can
get after design.”
With final layout approved, Advance
Environmental and Engineering Solutions, the engineering firm hired to carry
out the treatment plant upgrade, can move forward with designing many other
aspects of the new treatment plant that have been held up.
“Until you decide how to arrange
the site, you can’t do any tank or building or process design because it
affects the geometry of your facilities,” said AE2S Senior Project Manager
Scott Buecker, the lead engineer on the upgrade.
After a site walkthrough in
preceding weeks with Buecker, the board agreed on a layout for the plant that capitalizes
on the gradient provided by the slope beneath the plant, using gravity rather
than expensive and complicated pumping schemes to move waste material through
the plant and treatment process.
The layout also best takes
advantage of the property on which the plant resides, using the parkland that the
Big Sky Community Organization traded to the district late last year in return
for sewer capacity for the incoming community center. It also reserves the east
side, or down-gradient side, of the parcel for future expansion, according to
Buecker.
A headworks building, which begins
the treatment process in any wastewater treatment facility, will be the
structure nearest the community park, and will remove large course solids and
finer particles so they don’t damage pumps and mixers later in the treatment
process. The two-story headworks building, and other structures on the west
side of the plant, will be sunk 10 feet below grade and the displaced dirt will
be used to build a landscaped berm between the plant and community park to
maintain a low profile.
“We feel like we can keep it hidden
as much as it’s currently hidden,” Buecker said.
The upgrade is 30 percent designed,
according to Buecker; the next step is to finalize the preliminary engineering
report to submit to Montana DEQ. He said he’s shooting to have 50 percent
design completion for the upgrade by mid-October.
Upon voting, board member Peter Manka
added, “I just want to qualify my vote with the fact that we’re going to be
aesthetically sensitive down the road … to try to maintain support for this
project and be good neighbors.”
In other news:
- The
board entered into a contract with Evoqua Water Technologies to provide the
equipment for the membrane bioreactor filtration (MBR) technology that will be
used in the upgraded plant.
- The
board approved the drilling of an exploratory well on district property near
their water tower above Cascade Ridge near Beehive Basin, and is seeking access
to Boyne property to drill another exploratory well. This is part of the
district’s ongoing search for more water in the Mountain Village area and to
streamline the water supply system, which was not designed for its current
usage and relies heavily on few wells to supply water to many developments at
the base of Lone Mountain.
- The
district approved its indirect potable reuse study, which will clarify whether
the meadow aquifer will support a process called indirect potable reuse, a
process that involves injecting highly treated effluent into the ground to
recharge the aquifer from which the district draws its drinking water. The
process is common in municipalities in southwestern states, and is attractive
in Big Sky because of the impaired status of the North and South Fork of the
Gallatin River, which are legally protected from direct effluent discharge.
Indirect potable reuse would also conserve Big Sky’s scarce water supply.
- As
part of an ongoing rate structure assessment process, Ryan Graf and Miranda Kleven
of AE2S briefed the board on several alternative rate structures that could be
applied to better align the amount users pay with the cost of the district’s services.
- The
board directed Edwards to reach out to the utility that conducts water and
wastewater services for Firelight Meadows to learn more about the possibilities
of annexing the property into district boundaries.
