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MONITORING SUMMARY: CONTINUED <br />WHITAKER TREATMENT WETLANDS <br />The Whitaker Treatment Wetlands is a research project investigating new ways to <br />treat stormwater runoff. Completed in 2018, data will be collected until 2020 to <br />analyze how various materials treat contaminants such as phosphorus, nitrogen, <br />and E. coli bacteria. <br />Samples are gathered before (pre) and after (post) storm events and at various <br />points within the 3 treatment cells. Each cell consists of layers of gravel, sand, <br />and a unique mix of specialized sorptive media (concrete, peat, clay, tire crumb). <br />Sampling is staggered over a period of days as water moves through the system. At <br />right, E. coli levels are lower after water travels through the cells. The lowest level <br />is seen in cell 3. These results may indicate that the composition in cell 3 is the <br />most beneficial for removing E. coil bacteria. Research will continue until 2020 to <br />replicate and investigate these results, making recommendations for future water <br />treatment projects. <br />10,000 <br />1,000 <br />E <br />0 100' <br />z <br />10 <br />0 <br />0 1 <br />ui <br />0 <br />Whitaker Treatment Wetlands E. coli <br />Samples Surrounding a Storm Event: <br />9/4/2018 <br />Li I I II <br />Pre Gravel Sand Sorptive Post <br />Media <br />Material <br />■ Cell 1 <br />■ Cell 2 <br />■Cell 3 <br />VLAWMO staff monitoring <br />LAKE GRADES West Goose Lake. <br />VLAWMO uses the Trophic Status Indicator to summarize lake health. The trophic <br />status of a lake pertains to its nutrient levels, which helps assess lake health. TSI <br />is calculated from monitoring data and converted into a lake grade for familiarity. <br />VLAWMO Lake Grades: <br />Lake <br />2017 <br />2018 TSI Status <br />Amelia <br />B+ <br />B+ <br />Eutrophic <br />Birch <br />B+ <br />A- <br />Mesotrophic <br />Black <br />A- <br />B+ <br />Mesotrophic <br />Charlie <br />C+ <br />C <br />Eutrophic <br />Deep <br />C <br />C- <br />Eutrophic <br />Gem <br />B <br />B <br />Mesotrophic <br />Gilfillan <br />C <br />C <br />Eutrophic <br />E. Goose <br />D <br />D- <br />Eutrophic - Hypereutrophic <br />Eutrophic - Hypereutrophic <br />W. Goose <br />D <br />D- <br />Tamarack <br />D- <br />D- <br />Eutrophic - Hypereutrophic <br />West Vadnais <br />D- <br />D- <br />Eutrophic - Hypereutrophic <br />Wilkinson <br />C <br />C <br />Eutrophic <br />20 <br />