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DRAFT <br /> <br />IV. <br /> <br />Conclusions <br /> <br />o <br /> <br />o <br /> <br />o <br /> <br />Sedimentation rates within Lake Orono appear to be in the range of 1,700 to 6,900 tons per <br />year, equivalent to 0.004 to 0.017 feet per year over the whole lake area. <br /> <br />Total phosphorus and total suspended solids concentrations in the Elk River are within the <br />typical range for minimally impacted streams within the same part of the state. <br /> <br />Total phosphorus concentrations in Tibbits Brook are 25 percent higher than in the Elk River <br />and are on the high end of the typical range for minimally impacted streams within the same <br />part of the state. <br /> <br />In-lake total phosphorus concentrations in Lake Orono are very high compared to minimally <br />impacted lakes within the same part of the state. Based on total phosphorus data Lake Orono <br />is classified as hypereutrophic. <br /> <br />Poor water quality in Lake Orono is largely due to a very high watershed drainage area to <br />lake volume ratio, resulting in average water residence times of approximately three days. <br /> <br />Monitoring in the swimming area of the city beach indicated high levels of fecal coliform <br />bacteria above national public health association guidelines. <br /> <br />N :\059s\01 ~ELKKIVEK. KPT-rlb 17 <br /> <br /> <br />