5900 WEST GREEN LAKE WAY N

Feb. 4, 2016: Seattle Parks and Recreation proposes to manage phosphorus and cyanobacteria in Green Lake by applying aluminum sulfate (alum). Alum treatments inactivate the internal cycling of inorganic and organic phosphorus. The alum is applied near the water surface and it removes phosphorus from the water column as it flocculates and settles. It then covers the bottom sediments to further prevent the internal release of phosphorus from the sediments.

The alum treatment will be applied to the entirety of Green Lake at 8.2 milligrams per liter (mg/L as aluminum) on a lake-volume basis.

The alum application is planned to occur between March 21 and April 22, 2016. The treatment is expected to occur in 6 days within a 10-day period.

The alum treatment will be conducted in accordance with Ecology's Aquatic Plant and Algae
Management General Permit.

No structures are proposed.

Canceled.

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