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Removal begins of the right (north) abutment wall of the Milltown Dam Structure, 1/15/08,
Weekly
Update
For More Information:
Russ Forba, EPA
457-5042
forba.russ@epa.qov
Diana Hammer, EPA
457-5040
harnmer.d iana@epa.gov
Keith Large, MT DEQ
841-5039
klarae@mt.gov
Doug Martin, MT NRDP
444-0234
dmartin@mt.gov
Peter Nielsen, Missoula Co.
258-4968
NielsenP@ho.missoula.mt.us
Websites:
http://www.eDa.gov/
region8/superfund/sites/
mt/milltown
http://www.cfrtac.org
Milltown Reservoir
Sediments
LJ
Superfund Site
Issue #43
Milltown Reservoir
Community Office
(315 Anaconda St., Milltown, MT)
Winter Off ice Hours:
Tuesdays 1:00-3:00 pm
VEPA and DEQ staff are available.
Stop by to talk
or just say hi!
These weekly updates are intended
to provide you with the latest infor-
mation about remediation, restora-
tion and redevelopment activities at
the Milltown Reservoir.
US EPA Montana Office
10 W.I 5th St., Ste.3200
Helena, Montana 59626
I -800-457-2690
Status. The Milltown Reservoir cleanup is on schedule for powerhouse removal this winter;
diversion of the Clark Fork River into the bypass channel and breaching of the Powerhouse
coffer dam in early spring. Personnel have worked 117,527 hours without time lost.
Currently.
• Yesterday, workers
began removing the
right abutment wall
of the Milltown Dam
structure. This
marks another im-
portant project
milestone and the
first step in the
structural removal
of the Milltown
Dam. Workers are
creating a large
opening in the north
wall of the Power-
house so the genera-
tors can be removed
this week. Demoli-
tion will take about two
weeks to complete. Workers plan to begin demolition of the Powerhouse in February.
The Milltown Redevelopment Working Group is working with Northwestern and Envirocon to
preserve one of the generators and many other historic items from the Powerhouse. Demolition
is being documented with photos and video.
Continue loading rail cars with excavated sediment for transportation to the repository at
the Anaconda Smelter Superfund Site. 351,856 tons (305,962 cubic yards) of sediment have
been hauled to the Anaconda Smelter Superfund Site for disposal.
Resumed work on the bypass channel berm; Only approximately 10,000 cubic yards of mate-
rial are needed to complete the berm; construction should be completed in the next few weeks.
Continue to line the Bypass Channel. Installation of the reno mattress and TRM are about
70% complete. The lining should be completed in the next few weeks.
Trucks continue to haul rock per day to supply materials for lining the bypass channel and rip
rap for the upstream coffer dam. Rock will be hauled for another month from the east and west.
Excavation continues at the bypass channel outlet (see photo on page 2). Metal beams
("walers") brace the sheet piling during excavation; Excavation should be completed this week.
Twenty four dewatering wells are producing 2455 gallons per minute (gpm), of which, 2195
gpm are discharged into the Clark Fork River and 260 gpm are discharged to the Blackfoot River
directly. These numbers include the discharge from three new wells in the inlet coffer dam. The
other wells in the inlet structure are being abandoned so excavation of those contaminated sedi-
ments can begin. Pumping of wells to the sedimentation pond in the lower bypass channel has
been discontinued. This water is now discharged directly to the Blackfoot River.
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Upcoming
Events
Tuesday, January 22
Milltown Redevelop-
ment Working Group
monthly meeting,
6:30-9:00 pm at Our
Savior's Lutheran
Church in Bonner.
Monday, February 4
Missoula County will
host an open house to
discuss possible de-
signs for a pedestrian
loop trail from Bonner
to Turah. 4-7 pm at
the Bonner School.
Tuesday, February 5
Design Review Team
Site Tour
Tuesday, February 26
Milltown Redevelop-
ment Working Group
monthly meeting,
6:30-9:00 pm at Our
Savior's Lutheran
Church in Bonner.
EPA/DEQ Project Up-
date Open House and
Public Meeting, March.
Date/location TBD.
Design Review Team
meeting on Stage 3A
Preliminary Design
Report, mid-March.
AJpdate on Area Bridges
1-90: USACE and its contractors have poured the
inal concrete cap on the west bound center pier.
Next week, USACE will remove the sheet piling from
around the center piers.
Highway 200: MDT and its contractors continue to
make good progress; workers have begun removing the
decking on the old bridge. Traffic is now routed com-
pletely on the detour bridge. Speed limit is 25 MPH.
The new bridge should be in place this fall.
Pedestrian Bridge: Missoula County and its contrac-
tor have installed the work bridge and are now remov-
ing the concrete deck from the old pedestrian bridge.
The new "hybrid" bridge should be in place this fall.
Upcoming work:
Continue bypass channel berm construction
Continue reno mattress and TRM installation
Continue hauling rock for the "reno mattresses"
to line the bypass channel
Continue opening up the Powerhouse north wall
Install two grade control structures
USACE begins removing center pier foundation
forms and coffer dam
USACE begins removal of "flexi-float" barges in
Blackfoot River week of January 21.
USACE will re-configure the slope along the 1-90
embankment this summer
MDT continues work on the Hwy 200 bridge
County continues work on the Pedestrian bridge
PROJECT SCHEDULE
2008 Build coffer dam
MRL bridge mitigation
Powerhouse removal
Stage 2 drawdown
Sediment removal
Rail hauling sediment
Replace Hwy 200 bridge
Replace walking bridge
2009 Spillway removal
Sediment removal
Raul hauling sediment
2010
2011
Restoration
Redevelopment
Restoration
Redevelopment
Restoration
Redeveloi
Area residents: If you have
questions or concerns about
your well, please call Tony
Berthelote at 207-5856
or EPA at 457-5000.
¦ The Highway
™ 200 and
Pedestrian
Bridges in Bonner are active
construction zones.
For your own safety,
please obey posted signs.
f
L
Excavation adjacent to the
Sheet Piling at the Bypass
Channel Outlet.
Note the "walers" (metal
beams) at the base of the
sheet piling to provide struc-
tural support as soil is
excavated away.
EPA plans to open the Bypass
Channel in March 2008.
Final concrete cap on the center pier on the west
bound lanes of 1-90, January 11, 2008.
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