Weekly
Update
-or More Information:
Russ Forba, EPA
457-5042
forba.russ@epa.gov
Diana Hammer, EPA
457-5040
hammer.diana@epa.gov
Keith Large, MT DEQ
841-5039
klarge@mt.gov
Doug Martin, MT NRDP
444-0234
dmartin@mt.gov
Peter Nielsen, Missoula Co.
258-4968
Nielsen Pİ ho.missoula.mt.us
Websites:
http://www.epa.gov/
regionS/superfund/sites/
mt/milltown
http://www.cfrtac.org
Milltown Reservoir
Community Office
^(315 Anaconda St., Milltown, MT)
Office hours:
Tuesdays 12:30-3:30 pm
EPA and DEQ staff are available
stop by to talk or just say hi!/
Milltown Reservoir
Sediments
Superfund Site ^
Status: The Milltown Reservoir cleanup project is going well on schedule
for dam removal in spring 2008. Project personnel have now logged 54,096 hour
without time lost to injury.
Currently.
Excavation of the bypass channel continues. Last week work crews removed 30,000 yd3 of
sediments from the bypass channel. The total volume removed to date is 269,000 yd3. Excava-
tion continues in two locations, working towards the center of the site. When complete, the by-
pass channel will be 4100 feet long, 200 feet wide at the top and 100 feet wide at the base. Con-
tinue to stockpile sediments on site. The bypass channel should be complete in September 2007.
Work on the Bypass channel berm continues.
Begin staking in preparation for work on the rail spur from behind the Banner School onto the
project site. Once the area is staked out, work on the rail spur sub-grade can begin. Railroad
grade construction should take about 1 week to complete. Due to this work, access to the pro-
ject area will now be the Rustic Road (upper) entrance. The entrance will be gated and posted.
Begin preparing the site for construction of the railroad bridge over the bypass channel.
Dewatering of the sediments continues to going well. Envirocon is currently pumping from 19
dewatering wells on-site, down from 22 active wells last week and 29 the week before (some on-
site wells dried up and have been shut down). The wells produce approximately 3420 gallons per
minute (gpm). Continue to monitor the water level in the sediments using piezometers. Most of
the pumped water continues to come from the upstream wells. Current discharges are 3400 gpm
to the Clark Fork River and 770 gpm to the Blackfoot River. The discharges are monitored for
arsenic, copper, manganese, and iron.
Sedimentation pond will be finished this week. The headgate and discharge pipes from the
sedimentation pond to the river have been installed. Now completing the concrete work on the
outlet. The sedimentation pond will collect storm water from the site and temporarily hold it,
allowing any suspended solids to settle out before the water is discharged.
US Army Corps of Engineers will begin removing logs and timber crib piers in the Blackfoot
River upstream from the Stimson Lumber Mill this week.
USACE is finishing up the outer slurry wall 1-90 bridge mitigation. This will aid in keeping the
grout injected at high pressure from entering the river. A floating walking bridge has been in-
stalled across the Blackfoot River for the slurry wall work; it will also be use to carry the jet-
grout hose across the river and allow pedestrian access.
US Army Corps of Engineers and bridge engineers are designing an articulating wall that will allow
the high pressure jet-grouting work to continue.
These weekly updates are intended
to provide you with the latest
information about remediation,
restoration and redevelopment
activities at the Milltown Reservoir.
US EPA Montana Office
10W.15thSt.,Ste.3200
Helena, Montana 59626
1-800-457-2690
SAFETY REMINDER
DURING CONSTRUCTION. THE CLARK FORK AND BLACKFOOT RIVERS ARE CLOSED TO RIVER
RECREATION ABOVE AND BELOW THE MILLTOWN DAM AND RESERVOIR AREA.
Clark Fork River users must exit at the Turah fishing access; Blackfoot River users must
exit at the Weigh Station access point. VIOLATORS WILL BE FINED.
For more information, please call MT FWP at (406) 542-5500.
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Upcoming
Meetings
Tuesday, July 24
Community Health and
Safety Committee mtg. 10
am; Piltzville Fire Station.
Tuesday, July 24
Milltown- Banner
Community Council Site
Tour; 11am
Tuesday, July 24
Milltown Reservoir Rede-
velopment Working Group
meeting at the Banner
Lutheran Church;
6:30-9:00 pm.
Saturday, July 28
2007 Blackfoot River
Cleanup Day! Everyone is
welcome. Meet at 8 am at
Rainbow Bend Drive. For
more info., contact
George (244-4622) or
Marietta (244-5442).
Wednesday, August 1
Milltown Cleanup Project
open house (5:30-6:30
pm) and public meeting
(6:30-8:30 pm) in the
Banner School Gym.
Learn about the cleanup,
well monitoring, Trustee's
restoration plan,
and tnorek
i Upcoming work:
Continue bypass channel excavation
Continue bypass channel berm construction
Finish sedimentation pond this week
Continue rail spur construction from the main
rail line to the BP/ARCo repository
Continue pedestrian trail construction along
Highway 210 E from Fire Station to School
Begin building the railroad bridge next week
Work on the abutment underpinning is ex-
pected to resume next week.
2007
Compacting the base
of the bypass channel
Low flows on the Clark
Fork expose large logs
PROJECT SCHEDULE
Build haul roads
Build flood berms
1-90 bridge mitigation
MRL bridge mitigation
Build bypass channel
Build pedestrian trail
Construct rail lines
Rail hauling sediment
Stage 2 drawdown
Build coffer dam
Spillway removal
Spillway removal
Sediment removal
Replace Hwy 200 bridge
Dam removal
Powerhouse removal
Restoration
Redevelopment
09 Restoration Kfe
Redevelopment
2010 Restoration
Redevelopment
2011 Restoration
Redevelopment
2008
Bridge over the Blackfoot
River for jet-grouting
, work and pedestrian access
:A
Logs and stumps dug out of
bottom of the bypass channel.
Note the size of this conifer!
Bypass Channel
Clark Fork River
\
Blackfoot River
-
I Overview of the Project Area : July 17, 2007
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