5.3. SR 02-10-2003 - Laserfiche WebLink

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o (manure). Findings of the investigated complaint revealed strong manure odors and much algae growth within 100 yards of a large feedlot as they canoed the river. At lease two active pastures were open to direct contact with the Elk River with large bank cuts at both sides were also observed. The memorandum also notes that the County Ditch Inspector has observed at least one area where cattle are also entering County Ditches which discharge into the Elk River. Lake Orono Association representatives reportedly have photographs of cattle wading in the water. Chlorophyll A, total phosphorus, total suspended solids and volatile suspended solids data for Lake Orono This data is not discussed or attached to this report. The City and Lake Association test routinely for these parameters but is not a fecal coliform contamination matter. 4.0 CONCLUSIONS Based on the information gathered and provided to Liesch foi- review, the following conclusions are presented for consideration by the City of Elk River regarding the fecal coliform contamination that occurred at the Lake Orono City Beach during the summer of 2002. 1. Fecal matter has a relatively short life-span of 3 to 4 days. The fact that it was present at the beach at elevated levels for a relatively lengthy period of time indicates on-going source(s). Elevated concentrations of fecal coliform were identified at various locations and time intervals tested through-out the Elk River Watershed and Lake Orono. This data indicates there are multiple sources in the area. The highest concentrations of fecal coliform were identified downstream of a feedlot located upstream of Lake Orono. The elevated concentration downstream of an active feedlot area indicates that it is likely one of the main contributor's of the fecal contamination. o Near record high precipitation ~occurred in the area during the summer of 2002. Based on information reViewed, it is likely this condition had a effect on the occurrence and magnitude of the contamination. 5. The data indicates that fecal coliform test results can be highly variable and thus should only be used as general indicators or trends of contamination. The results of fecal streptococci testing to differentiate between human or animal waste origin were inconclusive but suggests that the contamination at Station 27 (downstream of the feedlot) and Lake Orono Beach is associated with animal waste impacts. LIESCH ASSOCIATES, INC. Hydrogeologists · Engineers · Environmental ScientistS · Jan-2003 · · Page 6 ·