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3. Fecal Coliform and Fecal Streptococci Monitoring <br /> Grab samples were collected from four locations on the Elk River and two locations in Lake <br /> Orono (see Figure 3). The samples were collected to verify reported elevated bacterial counts at <br /> the municipal swimming beach on Lake Orono as well as to identify potential bacterial source <br /> locations. The samples were collected using sterile Whirl-Pack sample containers. The Whirl- <br /> Packs were attached to a 15-foot pole to allow the samples to be collected away from the river <br /> bank. The containers were filled approximately 6-inches below the water surface. Upon filing, <br /> the Whirl-Packs were carefully sealed leaving approximately 25 percent of the container capacity <br /> as an airspace. The samples were immediately placed on ice in a cooler and were transported to <br /> the laboratory within four hours of collection. See Table 3 for a summary of the fecal coliform <br /> and fecal streptococci data. Water quality monitoring data are contained in Appendix C. <br /> C. COMPARISON OF 1970 AND 1996 DNR LAKE SURVEYS <br /> Based on fieldwork completed on May 5, 1970, the Minnesota Department of Conservation (now <br /> the DNR), mapped the depth to sediment and produced a lake map for Lake Orono. At the <br /> request of the City of Elk River, Lake Orono was remapped on August 28, 1996, for the purpose <br /> of comparing the two surveys such that any changes in lake depth could be observed for the 26- <br /> year time period between surveys (see Appendix F). <br /> The 1970 survey was scanned into a computer and, using the computer-aided design package <br /> Intergraph, the 1970 survey was compared to the 1996 survey electronically and the volume <br /> differential computed. To compare the two surveys in the above manner, the following_ <br /> adjustments were made to the survey data: <br /> 411 <br /> N:\0598 O1\ELKRIVER.RPT-NCW 7 <br />