http://users.sisqtel.net/armstrng/opinion051410.html
5/14/10 Part 2 of 2, Klamath Dam
Removal
DAM REMOVAL PART 2: Recently, I
attended a briefing by the “Technical Management Team” (TMT)
involved in the process established under the Klamath
Hydroelectric Settlement Agreement (KHSA) and Klamath Basin
Restoration Agreement (KBRA.) This process will lead up to a
decision by the Secretary of the Dept. of Interior (DOI) on
whether to take down the dams. The TMT are the scientists
and technical people who are gathering data to be used and
analyzed in the NEPA (National Environmental Policy Act) and
CEQA (California Environmental Quality Act) process. This
separate public process will produce a joint EIS
(Environmental Impact Statement) and EIR (Environmental
Impact Report.) The EIS/EIR will use the science gathered in
an analysis to “inform” the Secretary in his
decision-making. http://www..sisqtel.net/armstrng/ or
http://users.sisqtel.net/armstrng/
The ScienceTeams are separated
into the Public Interest Team (comprised of sub-teams for
Economic, Cultural/Tribal and Real Estate impacts;) and Dam
Removal Team (comprised of sub-teams for Hydrology,
Engineering, Reservoir Restoration, Sediment
Contaminants/Oxygen Demand and Biological impacts focusing
on fish.) A sub-team discussed the physical aspects of dam
removal. They talked about how water would be drawn down
before actual removal and how water would be by-passed
around the structures. There will be a decision whether all
of the dam structures will be removed or removed only in
part.
They discussed possible options of
salvaging, leaving or burying debris or hauling it out with
the metals and Hazardous waste. At
Iron Gate alone, more than a million cubic
yards of material could be hauled out during a 6-8 month
period 24/7. (I questioned the capacity and condition of the
county roads as a major limiting factor in this decision,
which they hadn’t considered.) They talked about how
replacement of the Yreka pipeline for water supply would
need modifications to protect fish. They mentioned that all
the downstream bridges have been surveyed for their capacity
to withstand the sediment releases and drawdown of the
reservoirs.
Next, they discussed restoration
of the reservoir bottoms. They plan on letting the sediment
go out as “natural erosion” the first winter and the try to
stabilize over two years. The first priority will be to
restore fish habitat along the riparian zones, including
side channels and spring-fed tributaries. They may also want
to develop wetlands for nutrient filtration. Although there
is a high erosion potential in the currently inundated
“uplands,” they don’t know how much money will be available
for erosion management. Their priorities will be to treat
areas with high public visibility first. The sediment
consistency is what is called “plastic silt” and has
considerable organic material in it. They are looking at
samples to determine a “seedbank” for what plants grow in
it. There is a concern for the spread of noxious weeds such
as starthistle.
The hydrology data shows some
interesting preliminary results. The models are using flow
and stream input data gathered for the years 1997-2009. They
are assuming climate has a cycle and are choosing five year
groupings of continuous wet, dry and average years for cycle
starting points in the predictions of what will occur from
2011-2061. They are then adjusting for anticipated “climate
change.” They are running the model for “no action,”
(current flows at
Iron Gate required under the recent March 2010
biological opinions.) Then they are comparing that with a
model run for “dams out.”
The resulting graphs showed very
little annual difference in the pattern of peaks and valleys
of the flows for either option. However, the current annual
flow with dams in will be reduced from 1,478.2 acre feet to
1,454.1 acre feet, putting greater pressure on the mid-river
tributaries for a greater contribution of flow to the
Klamath River. This is due to the fact that the
KBRA creates substantially more evaporation in the Upper Basin than now. One thing the hydrologist
did note was that downstream floodplains will change over
current conditions. How that will effect landowners along
the Klamath is unknown.
Last fall, considerable sediment
sampling was done at 32 locations for coring. These are
being tested for a broad possibility of contaminants,
including dioxins, PCBs and flame retardant. The raw results
are expected to be available in August, with an
interpretation following by early fall. Since much of the
sediment is fine silt and organic matter, they are also
looking at how suspended sediment will affect oxygen in the
water. This could impact fish 5-15 miles down from
Iron Gate. We also learned that they are not
currently considering doing a nutrient
(phosphorous/nitrogen) model. This is an important omission
because of the role this has in algae and fish disease.
The Biological Impact Team is
looking at impacts to species with recreational and tribal
value. (Excluding reservoir species such as bass.) Each
tributary and the mainstem Klamath will have established
goals for maximum production. There is an emphasis on
modeling production of fall run Chinook and the new salmon
habitats that would be created from dam removal. Experts are
also incorporating fish disease factors into models to see
how particle size and flow affect disease. Several “Expert
Panels’ are being assembled to focus on Pacific/resident
non-anadromous lamprey; rainbow/redband trout;
coho/steelhead; and Chinook.
Siskiyou County does have a “Demolition Ordinance”
in place (Title 10, Chapter 13 of County Code –Demolition,
Deconstruction, Removal and Reclamation.) This will require
the dam removal entity (DRE) to obtain a permit to demolish/
and or remove the dams. As set up in the current NEPA/CEQA
process, a separate public CEQA process will be required to
identify, consider, avoid, minimize and mitigate measures to
eliminate and reduce damage to the environment and affected
people. This includes impacts to roads and traffic, air
pollution, sediment management, erosion control and
downriver homes and bridges. The currently proposed federal
legislation for the KHSA/KBRA intentionally confounds
adequate consideration of these impacts stating that the
local permitting process will be followed as long as the dam
removal schedule is kept. |