From Rob Zisette, Principal Scientist, Herrera, Inc.
  and the Seattle Parks Department
Photos by Richard Flemimg

The 2016 Green Lake alum treatment will start at about 7:30 am on Tuesday April 5. Conducted by HAB Aquatic Solutions, the treatment is expected to be conducted from 6:30 am to 7 pm for five straight days ending on Saturday April 9. The treatment will be monitored on a full-time basis in accordance with the water quality monitoring plan and permit conditions. The monitoring plan is an appendix of the treatment plan that can be found at the project website.

The barge ready to be refilled. It will spread the alum treatment 12 hours a day for several days.

The alum will be applied near the water surface. It removes phosphorus from the water column as it forms small clumps and settles. It then covers the bottom sediments to further prevent the internal release of phosphorus from the sediments. The alum treatment is effective immediately upon application.

The tanker truck filling the storage tanks on the shore.

The alum treatment is intended to reduce phosphorus levels in the lake, limiting cyanobacteria (blue-green algae) blooms and improving recreational use of the lake. The alum treatment is applied from a barge on the lake. The treatment is pumped from a truck staged in the parking lot through hoses that will run over the Green Lake path to the barge. These hoses will require a small ramp to allow Green Lake path users to travel safely over them.

Algal scum on the lake, before the treatment.

Previous lake-wide alum applications in 1991 and 2004 effectively limited algae blooms and improved water quality. The alum treatment is expected to be effective for up to 10 years. The alum treatment plan was developed as part of the 2016 Green Lake Phosphorous Management Plan.

If you have additional questions about the project please contact Chris Mueller, Seattle Parks and Recreation project manager at chris.mueller@seattle.gov or 206-684-0998.

Room opens for socializing and conversation at 6:45 PM

• Introductions
• Prof. Mark Jordan, Biology, College or Science and Engineering, Seattle University
  • Wildlife in Seattle Parks
• Richard Fleming
  • Recent Activities and Happenings at Green Lake
  • “Punch List for Green Lake” At our meeting with the Parks Department in January, they asked if we would provide them with a list of projects or tasks that FOGL felt needed to be done or would be desirable to be done in the park. A major portion of our April meeting will address this task.
  • FOGL will no longer be doing or coordinating the open water sampling for King County’s Lake Stewardship Program.
• Ellen Hewitt
  • Webmaster’s Report
• Gayle Garman
  • Treasurer’s Report
• Next Meeting – April 26, 2016: Punch List for Green Lake Park
• Adjourn

Friends of Green Lake (FOGL) is a non-profit group in Seattle, Washington, whose mission is to ensure a healthy Green Lake for wildlife and recreation, for today and tomorrow.

Green Lake Alum Treatment Public Meeting will be in the Large Meeting Room, The Hearthstone, 7:00 to 8:30 p.m. on Tuesday, February 23

• Welcome and Introductions
  • Richard Fleming, President
• Alum Treatment: Project Overview and Schedule
  • Chris Mueller, Seattle Parks and Recreation
• Project Presentation
  • Rob Zisette, Herrera Environmental Consultants, Inc.
• Questions and Comments
• FOGL’s Next Meeting – March 22, 2016 – Prof Mark Jordan, Seattle University, wildlife in Seattle Parks.
• Adjourn.

Friends of Green Lake (FOGL) is a non-profit group in Seattle, Washington, whose mission is to ensure a healthy Green Lake for wildlife and recreation, for today and tomorrow.

Click here for a printable PDF of February 23 Alum Treatment Meeting Announcement Flyer

Seattle Parks and Recreation and the Friends of Green Lake invite the community to a meeting to learn about the alum treatment planned for Green Lake in the spring of 2016. At this meeting Seattle Parks and Recreation and Herrera Environmental consultants will present information about the implementation of the alum treatment and answer community questions.

The 2016 alum treatment is intended to reduce phosphorus levels in the lake, limiting cyanobacteria (blue-green algae) blooms and improving recreational use of the lake. Previous lake-wide alum applications in 1991 and 2004 effectively limited algae blooms and improved water quality. In order to preserve the health and safety of Green Lake, Seattle Parks and Recreation is treating the lake with alum again this spring.

This meeting is an opportunity to learn more about the alum treatment. Seattle Parks and Recreation would like to thank the Friends of Green Lake for their continued stewardship of the lake. Friends of Green Lake (FOGL) is a non-profit group in Seattle, Washington, whose mission is to ensure a healthy Green Lake for wildlife and recreation, for today and tomorrow. For more information please visit https://friendsofgreenlake.org/

FOR MORE INFORMATION
http://seattle.gov/parks/projects/
email: chris.mueller@seattle.gov
phone: 206-684-0998, Chris Mueller
http://green_lake/alum.htm

Room opens for socializing and conversation at 6:45 PM

• Call to Order and Introductions
  • Richard Fleming, President
• Seattle Department of Parks and Recreation – Planning and Maintenance activities at Green Lake Park and the funding process for these activities
  • Dan Johnson, Director Parks Division
  • Patrick Merriam, Parks Resource Manager
  • Colleen Hacket, Crew Chief NW District
  • Michael Shiosake, Director Planning and Development
• Rob Zisette, Herrera Environmental Consultants –
  • Status of the Spring 2016 Alum Treatment scheduled for Green Lake
  • Phosphorous in the Sediments
  • Green Lake Water Budget and Recording Surface Elevations
• Richard Fleming
  • December Rainfall, Meridian Outlet and Surface Level of Green Lake
  • FOGL will cease water quality sampling following the Alum Treatment
  • Gift Certificate for Paul Hewitt for development of FOGL’s excellent Web Site
• Ellen Hewitt – WebMaster’s Report
• Gayle Garman – Treasurer’s Report
• Adjourn
• Next Meeting – February 23, 2016 – Joint meeting, FOGL and Seattle Department of Parks and Recreation. The co-hosted meeting will lprovide an opportunity for the public to learn about and comment on the proposed Alum Treatment. The meeting is planned for the Chapel if it is available.

Friends of Green Lake (FOGL) is a non-profit group in Seattle, Washington, whose mission is to ensure a healthy Green Lake for wildlife and recreation, for today and tomorrow.