5.3. SR 02-10-2003 - Laserfiche WebLink

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1.0 INTRODUCTION The City of Elk River retained Liesch Associates, Inc. (Liesch) on July 10, 2002 to assist with the evaluation of fecal coliform contamination at the Lake Orono City Beach, Elk River, Minnesota (Figure 1, Appendix A). The City conducts routine sampling at the Lake Orono Beach for fecal coliform; the City has been conducting this testing since 1993. On July 3, 2002 the City of Elk River closed the beach due to elevated levels of this constituent. The beach was re-opened on August 8, 2002 after concentrations subsided below MDH recreational use ~idelines. This report summarizes the monitoring and source evaluation activities that were completed by the City, Sherbune County and the Lake Orono Improvement Association. 2.0 SCOPE OF WORK The scope of work for this project consisted of the following major tasks: · Collection of water samples by the City of Elk River at the Lake Orono beach for analysis of fecal coliform by the City of Elk River Wastewater Treatment Plant laboratory. Collection of water samples for analysis of fecal coliform by Sherbume County Soil and Water Conservation District and Lake Orono Improvement Association upstream of Lake Orono in the Elk River Watershed. · Submittal of select split or duplicate samples to Minnesota Valley Testing Laboratories (MVTL) for fecal coliform and fecal streptococci analyses. Field inspection by City of Elk River and Sherburne County environmental representatives of the area upstream of Lake Orono in the Elk River watershed for visual signs of contaminant sources. · Preparation of th/s Preliminary Assessment Report by Liesch summarizing the findings of the above referenced work and recommendations for additional work, if necessary. 2.1 BACKGROUND INFORMATION Data presented in this report was obtained from the City of Elk River, Sherburne County, and the Lake Orono Improvement Association. All fecal coliform sample analyses, were performed immediately after sample collection at the City of Elk River wastewater treatment plant's certified laboratory, with the exception of some split or duplicate samples that were provided to Liesch and forwarded to Minnesota Valley Testing Laboratories (MVTL) in New Ulm, Minnesota. According to City officials, routine fecal coliform testing has been performed at the Lake Orono City Beach since approximately 1993. Reportedly, elevated levels of fecal coliform LIESCH ASSOCIATES, INC. · Jan-2003 - Hydrogeologists · Engineers - Environmental Scientists - Page 1 -