The 2015 Lake Stevens Alum Treatment Project was completed yesterday without a hitch. This program removes phosphorus from the lake. Phosphorus is the limiting nutrient for blue green algae species, these single celled organisms can pose a health threat and degrade water quality. Removing phosphorus reduces the carrying capacity of the lake to product problem algae blooms.
Aquatechnex will be treating Lake Stevens with Aluminum Sulfate to target and sequester phosphorus the week of March 9th. We will staging from the County boat ramp on the west shore of the lake. The City of Lake Stevens will be posting signage at access sites, and there are no restrictions on the use of the lake during the application period.
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.