5.2. SR 09-22-1997 - Laserfiche WebLink

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DRAFT The flowrates at ERCR 15 were obtained from the U.S. Geological Survey (USGS), Minnesota District (see Appendix E). The USGS considers flow data to be "provisional" until eventual official publication. The flowrates at TBCR 35 were monitored by the Sherbume Soil and W~iter Conservation District. Flowrates for 11 of the flow measurements were based on stream gauging data collected in the field. Flow rates for the other seven monitoring events were calculated through interpolation on a rating curve developed for the station (see Appendix E). The flowrate at the dam was assumed to be the sum of the flowrates at ERCR 15 and TBCR 35. Concentration data (mass/volume) were multiplied by the average flowrate (volume/day) for the dates samples were collected to obtain the mass inflow rates at ERCR 15 and TBCR 35 (mass/day) and the mass outflow rates (mass/day) at the dam (see Appendix D). 3. Fecal Coliform and Fecal Streptococci Monitoring Grab samples were collected from four locations on the Elk River and two locations in Lake Orono (see Figure 3). The samples were collected to verify reported elevated bacterial counts at the municipal swimming beach on Lake Orono as well as to identify potential bacterial source locations. The samples were collected using sterile Whirl-Pack sample containers. The Whirl- Packs were attached to a 15-foot pole to allow the samples to be collected away from the river bank. The containers were filled approximately 6-inches below the water surface. Upon filing, the Whirl-Packs were carefully sealed leaving approximately 25 percent of the container capacity as an airspace. The samples were immediately placed on ice in a cooler and were transported to the laboratory within four hours of collection. See Table 3 for a summary of the fecal coliform and fecal streptococci data. Water quality monitoring data are contained in Appendix C. N:\0598\0 BELKRIVER. RPT-rlb 7