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05/06/1996 Park Board Packet
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05/06/1996 Park Board Packet
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Park Board
Park Bd Document Type
Park Board Packet
Meeting Date
05/06/1996
Park Bd Meeting Type
Regular
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Section 4 - Reshanau Lake <br /> According to Heiskary (1985), lakes with TSIs of 0 to 40 are oligotrophic, 41 to 50 are <br /> mesotrophic, 51 to 70 are eutrophic, and greater than 70 are hypereutrophic. According to this <br /> classification, Reshanau Lake is highly eutrophic. Eutrophic lakes have high nutrient content and <br /> ' high biological productivity. <br /> Tro hic State Indices can also be us <br /> ed sed to determine suitability for recreational uses. The MPCA <br /> (1990) classifies lakes as fully supporting swimming, partially supporting, or nonsupporting. A <br /> TSI of less than 60 indicates a lake fully supporting swimming. Reshanau Lake has a TSI of 68 <br /> and would be classified as nonsupporting swimming. <br /> INFLOW/OUTFLOW CONDITIONS <br /> Inflow water quality conditions were monitored at RL-1 and RL-2 as shown in Figure 4-1. Inflow <br /> RL-2 drains the largest portion of the watershed(2,090 acres)while RL-1 drain smaller residential <br /> portions of the watershed of 512 acres, respectively. Table 4-3 presents the inflow and outflow <br /> water quality data. <br /> uiflows for RL-1 and RL-2 were increasingly dependent on wet weather as the summer <br /> _ progressed. Site RL-2 with its larger drainage area had flow during all sampling times, although in <br /> August and September this flow was supplemented by well water from an adjacent well that was <br /> being developed. <br /> l - <br /> Total phosphorus concentrations in all of the inflows were almost always above the Metropolitan <br /> Council's guidelines of 100 µg/1 during the 1995 season except on the November 8th sampling <br /> date. The highest TP concentrations observed at site RL-1 generally corresponded with peak flow <br /> dates, and the flow-weighted mean concentration was higher than the arithmetic average <br /> concentration. This means that most of the pollutant load was contributed by larger storm events. <br /> The TSS concentrations were always below the 30 mg/1 guideline recommended by the <br /> Metropolitan Council. <br /> The DO in the inflows remained above 5 mg/l during sampling except during late July and August. <br /> These periods of low DO can be attributed to elevated stream temperatures and very low flow <br /> conditions. With higher temperatures, the ability of oxygen to dissolve in water decreases. Stream <br /> T site RL-2 was also under construction during the late summer months. A well was being drilled <br /> and developed during August and September. The groundwater was pumped overland into the <br /> 'MONTGOMERY WATSON Page 4b <br />
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