By Dick Rieman
Icicle Creek Watershed Council
The Leavenworth National Fish Hatchery is at the epicenter of opposing forces poised to collide. The U.S. Fish & Wildlife Service has two options; the reactive approach or the proactive alternative.
Three challenges face the Hatchery:
¬ Increasing Water Demands with Decreasing Supply Forecasts
¬ Elevated Phosphorous Loads in Hatchery Discharge Water
¬ A Deteriorating Water Supply Pipeline
Increasing Water Demands with Decreasing Supply Forecasts
Total water measured annually at the Peshastin USGS Gage Station has declined about 16% since 1966. Total water for key months of July, August, September and October has declined approximately 34 % since 1937 at the Peshastin Gage station. Center Time, the time when half of the annual flow has passed the Peshastin Gage Station, has moved from late May to mid April. The same Center Time movement is evident for Icicle Creek but it is less certain because of a 22-year gap in data from 1971 to 1993.
As has already been pointed out on the Watchery, the Hatchery is competing with other jurisdictions for water while at the same time being faced with an apparent trend toward less water. For example the following table shows the average minimum flows established by the Washington State Legislature during two different times in history for the summer and early fall months:
1983 2001
July 400 cfs 550 cfs
Aug 180 cfs 370 cfs
Sept 130 cfs 275 cfs
Oct 130 cfs 267 cfs
What is interesting about 1983 and 2001 instream flow minimums is that they have actually been raised since 1983 to 2001, reflecting the quantity of water the public and scientists think should be flowing for a healthy Icicle Creek. The recent Section 401 Certification order No. 7192, required by the Clean Water Act so the Hatchery can discharge into Icicle Creek, allows the Hatchery four (4) years to recommend minimum flows for Icicle Creek.
The process outlined by the state DOE through the 401 Certification process to determine the recommended flows is called an Instream Flow Incremental Methodology (IFIM study). It turns out to be a combination of science and politics. However, with 1983 and 2001 historical precedence in place, it’s entirely probable that recommended flows for Icicle Creek could be so high that the Hatchery would have to reduce its productivity to abide by the state’s directive. If that came about, it might conflict with the fish-production treaty obligations the Federal Government has with tribes.
Added to the state’s instream flow requirement will be a minimum instream flow assigned under the Endangered Species Act, following consultation with NOAA Fisheries. The minimum flows linked to the ESA are not negotiable and will be enforced.
What happens if the Endangered Species Act and the Clean Water Act conflict with the Tribal Trust Doctrine and the 1855 Treaties signed between the United States and the Tribes? Is the Federal Government still obliged to try and mitigate for the loss of fish because of Grand Coulee Dam?
In other words, we have several trains steaming toward an epicenter, all scheduled to arrive at the same time.
Elevated Phosphorous Loads in Hatchery Discharge Water
The Department of Ecology’s October 2009 Wenatchee River Watershed Dissolved Oxygen and pH Total Maximum Daily Load draft Water Quality Implementation Plan (p. 33) points out the following:
“The Leavenworth National Fish Hatchery (LNFH) currently discharges approximately 25 to 30 million gallons per day and 1.27 kg/d of phosphorous to Icicle Creek. The target phosphorous Waste Load Allocation (WLA) for LNFH is 0.48 kg/d, a 62% reduction. This WLA is equivalent to a 5.2 ug/L total phosphorus concentration and phosphorus removal technology limits will not allow LNFH to meet this WLA. In fact, LNFH’s current phosphorus discharge concentration of approximately14 ug/L is already below the limits of technology. As a result, alternative effluent management will be required by LNFH. Such alternatives might include effluent phosphorus trading or reclaimed water use; however, these activities would likely only relieve LNFH of the phosphorus WLA to a small degree, since LNFH’s discharge flows are so high.”
The language may be dry, but the point is clear. The Hatchery is at an impasse when it comes to meeting phosophorous limits.
The recent Draft Section 401 Certification Order No. 7192 referred to above allows the Hatchery five (5) years to meet a discharge limit of 5.7 ug/L total phosphorous — which DOE admits cannot be attained.
Small towns along the Wenatchee River and a couple of fruit packing houses are also being required to meet phosphorous discharge limits. If the Hatchery continues to discharge high phosphorous loads into Icicle Creek it will place a heavier burden on small jurisdictions along the Wenatchee River, due to the confluence of Icicle Creek and the Wenatchee River being above the towns. The Department of Ecology’s ultimate goal is to address low dissolved oxygen levels in the Wenatchee River itself, further increasing the burdens on the small towns if the Hatchery can’t meet its Waste Load Allocation.
The amount of water discharged from sewage treatment plants along the Wenatchee River is dwarfed by the amount of water discharged from the Leavenworth National Fish Hatchery. The Leavenworth National Fish Hatchery discharges between 25 million and 27 million gallons of waste water from fish raceways into Icicle Creek each day. During the summer and early fall months most of the water volume in Icicle Creek below the Hatchery is made up of Hatchery discharge water.
There appears to be no economical way to reduce phosphorous. Reverse Osmosis works but costs around $350,000 to treat just 1,000 gallons. The Clean Water Act does not allow the Hatchery to solve its phosphorous problem by mixing clean water with discharge water (to dilute their phosphorous load). Even if this was allowed, the Hatchery doesn’t have access to enough clean water to bring the load down to acceptable limits.
One answer to the phosphorous problem is for the Hatchery to seriously consider radically reducing the volume of discharge — which would mean substantially less water flowing through the Hatchery, resulting in fewer numbers of fish. Such an action would conflict with the Tribal Trust Doctrine and Treaty obligations and the Federal Government’s Grand Coulee Dam fish mitigation agreement.
The Department of Ecology is serious about enforcing phosphorous Waste Load Allocations.
Here we have three more trains steaming toward the same epicenter referred to previously.
A Deteriorating Water Supply Pipeline
It has been known for at least 10 years that the water supply pipeline to the Leavenworth Hatchery is falling apart. The day will come when a piece of concrete liner will break loose and instead of being discharged into the Hatchery’s sediment settling chamber will lodge in the pipe, blocking water to the Hatchery’s raceways.
The last two times it attempted to fix the pipeline, the Hatchery tried to combine the repair with the restoration of Icicle Creek — unfortunately resulting in more negative impacts to the stream. The fact of the matter is that water supply to the Hatchery is intermingled with the flow of Icicle Creek so that the water supply pipeline cannot be fixed without negatively impacting the stream — and vice versa.
Diverting water from Icicle Creek using dams and pumps or using dams and gravity impacts stream flow and native fish migration in the Icicle. This quandary is magnified by more frequent and increasingly lower stream flows.
If the water supply pipeline is allowed to become an emergency, there won’t be time to fully vet solutions. The result will likely be unintended consequences — a situation most managers wish to avoid.
This is one train steaming ahead with the rails missing from an unknown mile of track.
To summarize; The Leavenworth National Fish Hatchery is on a collision course with the Endangered Species Act and the Clean Water Act, as well as Mother Nature. Coming into compliance with these two flagship pieces of legislation could place the Hatchery in conflict with the Tribal Trust Doctrine and the treaties signed between the Tribes and the United States Government. Additionally, the Hatchery appears to be on a collision course with Climate Change and an educated public that knows the difference between a healthy river and one that is severely compromised. And finally, the Hatchery is exposed to an increased risk of a failed water supply line.
Two alternative technologies already being used might help the U.S. Fish and Wildlife Service Leavenworth National Fish Hatchery avoid the collisions pointed out above:
¬ Partial Reuse Aquaculture Systems (PRAS)
¬ Recirculating Aquaculture Systems (RAS).
Partial Reuse Aquaculture Systems (PRAS)
Partial Reuse Aquaculture Systems use water treatment processes to allow a portion of the culture discharge water to be recycled back into the culture tanks. For aquaculture facilities — including hatcheries — faced with limited water resources (Leavenworth), reuse technology is the next step in the technological evolution of modern aquaculture systems.
Compared to the “flow–through system” that the Leavenworth Hatchery uses, PRAS offer significant reductions in water consumption, effluent discharge volumes and potential energy consumption.
Partial Reuse Systems focus on the use of a few simple treatment technologies to provide significant reductions in water use. These typically include gas-balancing and oxygenation, may also include solids removal and disinfection, but do not normally include ammonia removal through biofiltration. (The main reason reuse culture systems are not as efficient at reusing water as recirculating systems is because harmful accumulations of ammonia need to be removed — which requires using additional water to flush ammonia out of the system.) Water quality where treatment is not provided is maintained within acceptable limits by flushing along with replacement of a portion of the system water. Water temperature is dependant on influent water, which may be more economically altered than in a flow-through system, due to the lower flow rate.
With reduced water use, influent treatment and effluent treatment become more economical.
Partial Reuse Systems use 50% to 75% less water than flow-through systems. For example, the Chelan County PUD Eastbank Hatchery uses 324 gpm in its water reuse system to raise 120,000-250,000 Chinook salmon. In contrast, traditional raceways use 1,206 gpm of water flow to raise that many fish.
Lower flow requirements would have a huge impact on the configuration of water to the Hatchery. The reduction in water use would enable capturing waste more effectively in an effluent total four times smaller than from flow-through systems like the one the Hatchery is using.
Recirculating Aquaculture Systems (RAS)
Recirculating aquaculture systems incorporate additional treatment technologies beyond those used in PRAS, permitting reuse of significantly greater quantities of water. Recirculation systems afford a level of control well beyond any other technology application in aquaculture and provide significant production and economic benefits.
Recirculation systems are typically used where new water supplies are limited or expensive (e.g. high pumping costs). Also, recirculation is typically used where the risk of introducing pathogens is high, where effluent disposal capacity is limited or where operators require strict control over water temperature within the fish culture system.
Recirculation Systems have high initial capital costs. However, in a well-designed RAS, benefits will outweigh additional costs, resulting in a lower net cost of production.
Full recirculation culture systems remove ammonia using bio-filtration. (Remember, ammonia is the reason reuse systems conserve water at rates no higher than 75%.) Bio-filtration provides a suitable environment for colonizing autotrophic bacteria to metabolize ammonia as the system water passes through the filter vessel. Bio-filters enable hatcheries to operate in a near closed loop, where the only water losses are through evaporation, and solid waste removal. Makeup water then is reduced to a relatively small fraction of the total system volume. Just enough makeup flow (< 2%) is required to maintain acceptably low concentrations of trace minerals and salts which could otherwise accumulate to harmful levels.
It might even be possible for the Leavenworth Hatchery to produce the same number of fish it produces today using only Nature-provided, sustainable well water — no need for surface water from Icicle Creek. Imagine the environmental good such a system would bring to the Leavenworth Hatchery. Most of all, imagine the reduction in conflict over fish and water resources!
Europe has been the leader in recirculation system development because of mature water markets and because Europe has some of the most rigorous pollution abatement standards applied to aquaculture effluent discharges anywhere in the world.
The July/August 2006 edition of Hatchery International points out that:
“In North America, commercial salmon hatcheries began adopting recirculation systems technologies over a decade ago. Publicly funded hatchery systems, frequently with an aging infrastructure dominated by raceways, are seizing development opportunities to take advantage of water reuse technologies in the greater public interest of water conservation and to improve the effectiveness of hatchery operations. There is a growing trend to consider water reuse as a central element of integrated and sustainable water resources worldwide, aquaculture industry leaders recognize their responsibility and are responding with appropriate, productive, and sustainable solutions.”
Australia’s Tassal Group Ltd., is building a new Hatchery on the Huon River which will raise 4 million smolts a year. Tassal, a privately owned company, conducted a world -wide tendering process and selected a state-of-the-art RAS technology provided by Aquatec Solutions (AQS) of Denmark for the new Huon River Hatchery. The key reason AQS was selected was because their system provided for the least water usage along with the highest quality discharge.
The AQS RAS system includes technology for temperature control, pH balancing, and oxygen addition, water filtration via micro screens, carbon dioxide removal, ammonia removal, disinfection, de-nitrification and phosphorous removal elements.
Project capital cost is budgeted at $18.5 million. Remember, this project is designed to produce 4 million smolts. It is reasonable to assume that since the Leavenworth Hatchery produces between 1.2 million and 1.625 million smolts, the installation of an AQS RAS system would be less than $18.5m. In fact, the Bureau of Reclamation is considering spending $10 million on a dam and pumping water supply line system on the Icicle, with no associated improvements to the fish rearing capabilities of the Hatchery.
It is hard for me to believe that over the past few years we have been designing dams and fish ladders to squeeze the last drop of water from Icicle Creek and Snow Lake when RAS and PRAS technology exists. It is more difficult for me to understand why recirculating or reuse systems were not recommended by the Bureau of Reclamation and the Fish and Wildlife Service to solve river restoration and Hatchery productivity problems in an era when this type of technology has been and is being implemented in Canada, Australia, Denmark, Europe and more progressive parts of the United States.
It’s like being told to build a log home with an axe and a crosscut saw when chainsaws and electricity are only 50 miles away. It’s like being required to hang a deer skin over a window opening when glass is readily available.
At Leavenworth our governmental leaders need to propose a solution that capitalizes on the new technologies described above. If our leaders won’t do it, local citizens certainly know how to carry this ball. We who live here should never settle for a degraded river, a compromised river or threatened aquatic life when technological solutions are only a click of the mouse away.