Addendum No. 1 to Canyon Lake Hybrid Treatment Process -- Phase 1; Consideration of the Lake Elsinore and Canyon Lake TMDL Task Force, inclusive of the Lake Els

Addendum No. 1 to Canyon Lake Hybrid Treatment Process -- Phase 1; Consideration of the Lake Elsinore and Canyon Lake TMDL Task Force, inclusive of the Lake Els

In 2013 the City prepared an Initial Study that evaluated the proposed in-lake management activities that were designed to reduce excessive algae growth by reducing phosphorus concentrations in Canyon Lake. Too much algae tends to deplete dissolved oxygen levels in the water column that, in turn, can lead to significant fish kills in the lake. Excess algae are also unsightly and interfere with recreation in and on the lake. Phosphorus is an essential nutrient that acts like a fertilizer for growing algae. Alum forms a chemical bond with phosphorus that renders it inert and no longer able to grow algae. This addendum is being prepared in response to the stakeholders desire to extend the pilot alum application program in the lake for the next 10 years. After considering the available options for complying with the CEQA regarding this proposed extension of the alum treatment at Canyon Lake, the City and stakeholders concluded that compiling an Addendum to the 2013 MND would be the most appropriate way to comply with CEQA for the proposed extension of the alum treatment into the future.

Canyon Lake

Riverside