2011-10-20_Minutes - Laserfiche WebLink

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2018, but could require two field seasons, taking us to 2019 or 2020 before we can determine how CIP, better enforcement of the existing no -wake ordinance and control of invasive plant species reduce SRP. Concurrent with initiating a comprehensive, whole -lake reduction and control program for invasive species of aquatic plants, a program should be set up to reduce carp populations in the lake. Initially the program could include trapping and removal of the largest reproducing age classes. A combined education /recreational program to encourage carp fishing and harvesting could also be developed. If these to activities do not produce the desired results, then alum treatments could be used as a follow - up implementation. Alum treatment, however, is usually not considered as a one -time SRP reduction technique, but rather would require periodic re- treatment at perhaps five to 10 -year intervals. If, in 2018 or 2019, it appears that alum treatments are necessary, it will take until 2021 or 2022 to assess the effectiveness. As a control measure for minimizing internal loading of phosphorus from deep sediments, hypolimnetic aeration can, in some situations, produce measurable results. However, the infrastructural costs, maintenance costs and security costs are very high, and may preclude this as a desirable option. I would recommend that it only be considered as a last alternative, and only if engineering models predict high probability of success. If we think of options for managing phosphorus dynamics in a comprehensive, programmatic manner, with implementation followed by assessment, I think it is only realistic that activities 1 -4 can be done over the next decade. Consequently, I would recommend that the clauses related to whole lake "no- wake zones or no motorized watercraft" do not really fit within the time horizon of the Third Generation Ten -Year Comprehensive GLWMO Plan, and I would recommend to the Board that they not be included in this document.