Our summer surveys have found some areas that could use treatment to continue the reduction of this noxious aquatic weed in Lake Stevens. Tomorrow August 20th we will be delivering notices to those shoreline residents that are within a quarter mile of potential treatment areas. This is a Department of Ecology requirement. The actual restrictions on water use only apply within 400 feet of the actual treatment area so these restrictions will not impact everyone notified.
The primary restriction is on the use of lake water from the treatment area for irrigation for approximately 2-5 days. This treatment will be happening after Labor Day.
We will post more information here as well as a interactive treatment map that you can view when the treatment gets closer.
The second year of the alum treatment at Lake Stevens will begin tomorrow, Tuesday May 13th. This work is expected to run through Friday. Aquatechnex will be operating two large application vessels on the lake and applying 55,000 gallons over the course of the next few days. We will be working from Wyatt Park on the West Shoreline of the Lake. The lake will be treated in blocks and completely covered over the course of the next few days.
More pictures will be posted tomorrow.
Aquatechnex biologists will be treating portions of Lake Stevens targeting remaining Eurasion Milfoil. The first plots will be off shore in the northwest bay of the lake. Signs are posted on properties where water use restrictions apply. The treatment areas and the buffer zone where water use restrictions are in place is shown here. http://bit.ly/154iGDj
The water use restrictions within the treatment area and buffer are 24 hours swimming advisory and an irrigation withdrawal restriction. There are no restrictions in place outside of the marked areas shown in orange here.
The survey work completed this past summer and in June of this year has identified a number of sites that would benefit from spot treatment for Eurasian Milfoil. This work is being performed under the direction of the Integrated Aquatic Vegetation Management Plan developed by the City of Lake Stevens and Aquatechnex, LLC as the contractor for the City.
Public notification will be delivered to residence adjacent to the treatment areas and we will post a treatment zone map that shows actual locations in a few days. The product to be used will be Renovate OTF granular and this work will be done under the direction of a permit from the Washington Department of Ecology. There will be water use restrictions for irrigating or pumping water from the treatment plots to irrigate until herbicide levels drop below label requirements, we will keep you informed of that. In addition Ecology suggests that swimming in treatment areas be avoided until 24 hours after application.
We will be working with the City to identify a treatment day that does not interfere with two key events on the lake in July, The Ironman Competition and the Aquafest. We will post treatment dates next week as they are finalized with the City.
Wind Blown Blue Green Algae Accumulating on South Shoreline in 2012
Aquatechnex Biologists applied Alum to Lake Stevens to mitigate phosphorus pollution
The Aquatechned team completed the Lake Stevens Aluminum Sulfate Application this past Friday morning. The lake was treated with this material to mitigate phosphorus pollution in the water column. Higher levels of phosphorus fuel bluegreen algae blooms and removing phosphorus lowers the carrying capacity of the lake for this problem. This work will be followed up with monitoring and the program should be ongoing for the next few years.
Aquatechnex biologists will be treating Lake Stevens with Alum this week to sequester phosphorus, the key nutrient that drives algae blooms. This operation will involve two application vessels spraying alum across the surface of the lake. The boats have to travel straight lines so cooperation of the fishing public is appreciated.
There are no water use restrictions.
There will be two major efforts on Lake Stevens this summer.
The first will be a treatment with Aluminum Sulfate. This is tentitively scheduled to begin the week of June 3rd. Alum is a technology that captures phosphorus and removes this key nutrient from the water column. This reduces the carrying capacity of the lake to produce problem algae blooms. This operation is pending approval by the City Council that is expected to work on this at their next meeting. When approved, the crews will be working to apply this material throughout the deeper portions of the lake in this time frame.
The second operation will be the continued implementation of the City’s Eurasian Milfoil Management Program. The 2011 application of Renovate Aquatic Herbicide did an excellent job of suppressing this noxious aquatic weed. Our team will be surveying the lake in June and have scheduled a treatment to some areas of the lake that showed potential for regrowth during the 2012 summer surveys. We will post more information and a map on this site as those surveys are completed.