Aquatechnex is pleased to announce that we have launched a new company web site. The focus of this site will be to provide interested parties with information on our company, our capabilities and our projects. We will also be able to consolidate our news blog here so people will no longer have to go to multiple sites to get the news. Thanks and please give this a look, bookmark and come back often as content will be updated.
Over the past three years, Aquatechnex biologists have been assisting agencies in Washington State management the invasive aquatic weed Eurasian Milfoil. Two of these major projects have reduced the Eurasian Milfoil populations from in excess of hundreds of acres to scattered plants that divers can easily remove.
Lake Tapps is a 22oo acre reservoir off the White River in suburban Seattle Washington. This shallow system was established to produce hydro power, but relicensing costs prompted the utility to sell the system to the Cascade Water Alliance. The lake has for years been fully developed with lake front homes. Eurasian Milfoil had been introduced and expanded to the point of dominating the entire littoral area of the lake.
The key to targeting this infestation was to develop and implement a plan using two aquatic herbicide formulations that focus on Eurasian Milfoil. In 2010, our team implemented a treatment program with Sonar Precision Release aquatic herbicide. We made three applications at two week intervals and monitored the levels present to ensure exposure over 6-8 weeks. That treatment focused on all of the infested bays on the lake system. http://www.theolympian.com/2010/08/21/1342878/chemical-to-fight-milfoil-at-lake.html provides a summary of this program. In 2011, our team switched our focus to areas that were smaller and more exposed to dilution. We selected Renovate OTF, a granular controlled release formation of Triclopyr, this product is selective for Eurasian Milfoil. At the start of 2012, the lake is free of this noxious weed, levels are so low that diver removal will be adequate to move forward. http://www.theolympian.com/2010/08/21/1342878/chemical-to-fight-milfoil-at-lake.html provides more background.
The second system is Lake Stevens north of Seattle. This 1200 acre lake system had approximately 135 acres of solid Eurasian milfoil at the start of the 2011 summer season. The plan developed for this project called for the use of Renovate OTF. Aquatechnex team targeted this growth using precision application systems. At the mid point in the 2012 season, survey efforts have shown that only scattered plants remain and diver actions again will be used to remove the remaining plants.
These technologies were used by our firm on Lake Pend Oreille through work performed for Bonner County and funded by the ISDA program. Many Sonar areas treated in 2006 remain free of Eurasian Milfoil to this day, and other sites are just now starting to show signs of increased impact. Renovate OTF is also a preferred formulation of triclopyr herbicide because it can control Eurasian Milfoil using lower amounts of herbicide, something that new NPDES permits require.
Aquatechnex biologists have deployed a new technology to combat phosphorus pollution in lake and river systems in the Western United States. Phosphorus is the limiting nutrient and excessive phosphorus loading in lake systems can lead to toxic algae blooms. Phoslock is a technology that allows us to remove and sequester phosphorus. See http://www.king5.com/news/environment/New-weapon-used-in-blue-algae-battle-in-Federal-Way-158508465.html
There are a number of new tools to combat Eurasian Milfoil that our team is deploying around the Pacific Northwest and there is a new permit program that allows homeowners associations to take on the mission of protecting their waterways. For more information go to www.pomilfoil.wordpress.com
Last week’s aquatic herbicide treatments at Bear Creek and Priest Lake Marina were performed with liqud triclopyr. There are restrictions placed on water use for potable and irrigation uses until levels are below labeled levels within the treatment area.
The Idaho Department of Agriculture has sampled these treatment sites and the herbicide levels have dropped to the point where water use restrictions have been removed.
Aquatechnex will be assisting the Idaho State Department of Agriculture target Eurasian Milfoil in Priest Lake this week.
Our biologists plan to treat two locations in the lake that have experienced Eurasian Milfoil Growth in the past and continue to have some plants present at a level higher than can be addressed with divers. We will be applying Ecotriclopyr to portions of Bear Creek and to a marina on the West side of the lake. The application is planned for the afternoon and evening of Wednesday August 24 weather permitting.
As Priest Lake is a large water body, wind driven water currents can be a factor in maintaining contact of the herbicide with the target weed communities. As such, we target portions of the day for treatment when wind conditions are very low. If there are issues, the treatment may be delayed.
There is an irrigation restriction for those that might draw water from the treatment area. The State will be sampling this and will let us know with the levels are below those the label requires be met. We will post additional articles here this week as the treatment progresses.
The Idaho State Department of Agriculture has asked our firm to conduct Eurasian Milfoil treatments on Priest Lake in August of this year. The target dates will be the week of August 22 with the fall back dates of the week of August 29th.
We will be treating portions of Bear Creek Bay where some Eurasian Milfoil plants have remained, and we will be treating one marina area. The exact treatment dates and treatment maps will be posted near the end of next week as the weather forecasts become available.
Weather is a key consideration on this project. A very large lake such as this where the prevailing winds push from the south over the 40 mile length of the lake can move considerable amounts of water. As the winds die off, water pushed to the north flows back. In smaller lake systems this is generally not an issue or noticeable, but in this case we have noted extreme currents following wind events even when conditions were flat calm. This can affect the herbicide application if treated water is pushed out of the treatment areas and contact time is limited.
As we did last year, we will be using weather conditions as one of the key parameters in setting the application date and time. So check back often.
ISDA personnel will be delivering notification to those home near the treatments, if you do not receive one you are probably well outside the treatment areas.