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• <br />AGENDA ITEM 6.A. <br />STAFF ORIGINATOR: Marty Asleson <br />MEETING DATE: April 13, 2009 <br />TOPIC: Consideration of Resolution No. 09 -20, Approving <br />Cost -Share in Reshanau Lake Water Quality Efforts <br />VOTE REQUIRED: 3/5 <br />BACKGROUND <br />Over the last three years property owners living on Reshanau Lake have been <br />working with Rice Creek Watershed District (RCWD) to address lake water quality <br />problems. The residents have worked with RCWD on the creation of a management <br />plan for Reshanau Lake. Lakeshore property owners and the Watershed District <br />have been cost - sharing remediation recommendations of the plan. Initial results of <br />the work done have been positive. Treatment of the lake is proposed to be <br />continued in 2009. The City owns 1,600 feet of lake shore and given our <br />responsibilities as a Municipal Seperate Stormwater Sewer System (MS4) City, we <br />are proposing to contribute to this process. <br />ANALYSIS <br />In compliance with the Federal Clean Water Act, the Minnesota Pollution Control <br />Agency (MPCA) assesses the health of lakes and streams in the state. Waterbodies <br />that do not meet basic use standards designated by MPCA are placed on the state <br />303(d) "Impaired" list. Use standards are defined descriptively in the Clean Water Act <br />(i.e. Fishable /Swimmable), but have been assigned numeric criteria by the MPCA. <br />These criteria were developed to recognize inherent differences in waterbodies <br />caused by factors such as location (ecoregion), geologic substrate, and depth. The <br />MPCA considers several parameters when determining whether or not a lake is <br />meeting its designated uses. Reshanau Lake is classified as a Recreational Lake <br />and a Shallow Lake. <br />For Shallow Lakes (lakes less than 15 feet deep), a lake is determined to be <br />impaired for recreational use if a lake exceeds the following numeric standards: <br />Total Phosphorous 60 micro grams per liter <br />Chlorophyll a 20 micro grams per liter <br />Secchi Disk 1 meter <br />41111 Reshanau Lake, is classified as an impaired water by the MPCA because it has <br />exceeded total phosphorous standards through out the period of recorded records <br />