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To: <br />Fro <br />Ron Moorse, City Administrator <br />Michael P. Gaffton, Assistant Planning & Zoning Administrator <br />Date:January 18, 1994 <br />Subject: MCWD - Long Lake Improvement Project <br />List of Exhibits <br />A - <br />B - <br />C - <br />D - <br />E - <br />Feasibility Study Excerpt: <br />Feasibility Snidy Excerpt: <br />Feasibility Study Excerpt: <br />Proposed Schedule <br />Cost Estimate <br />Public Information Program <br />County Road 6 Basin <br />Aeration System <br />Diagnostic Study <br />The diagnostic smdy found that: <br />. summing and fishing in Long Lake are impaired due to water quality degradation. <br />Fish surveys indicate mainly rough species (bullheads and suckers), with substandard <br />counts of giinc fish (bass and northern pike). <br />The watershed contributing to the lake is primarily woodland, cropland and horse <br />pasture. <br />• Blue-green algae blooms in the summer detract from swimming and are directly <br />related to Long Lake’s phosphorus loading. <br />• Dissolved oxygen is generally too low to support game fish. Reduemg the <br />phosphorus load wiU raise the oxygen levels and enhance game fish populations. <br />. The lake’s internal phosphorus load (from bottom sediments) and exte^ <br />^d (enterSg from the tributaries) are about equal, and account for 90% of the total <br />phosphorus inputs to the lake. <br />. Hydraulic residence time is short (1.3 years, compared to 25 years for ^e <br />InLieionka); therefore phosphorus load reductions should show immediate water <br />quality improvements.