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COMMUNITY HEALTH DEPARTMENT <br />ENVIRONMENTAL HEALTH MANAGEMENT GROUP <br />Suites 202-206 <br />HENNEPIN 32 Tenth Avenue South <br />LFUHopkins, Minnesota 55343 <br />October 3, 1983 <br />Ms: Penny Grabek <br />960 re f Arms Lane <br />Mound N 55364 <br />War Ms-Grabek: <br />L L <br />L <br />f <br />• is <br />The results of the water samples taken from Forest Bay of Lake Minnetonka on <br />September 21, 1983 at 9:30 am are as follows: <br />Location of Sample Fecal Coliform Fecal Streptococcus <br />Shore 30/100 ml 40/100 ml <br />Boat channel 980/100 ml (*} 560/100 ml <br />(*) Plates were too overgrown with bacteria to court coliform. Counts were <br />estimated. <br />The Recommended Standards for Bathing Beaches of the Great Lakes -upper <br />Mississippi River Board of Sanitary Engineers, 1975 Edition, which is used as a <br />guide by the Minnesota Department of Health states that for <br />bacteriological quality "The fecal coliform density from the last five <br />successive sets of samples collected on five different days shall not exceed a <br />geometric mean of 200 per 100 mt,'� When the fecal coliform density of any <br />sample collected exceeds 1,000 per 100 ml consideration should be given to <br />closing the bathing beach, and daily sample shall immediately be collected and <br />analyzed for fecal coliform for at least two consecutive days." <br />The coliform count was not found to be so high in the samples collected to <br />recommend that the lake not be used for swimming. There are no recommended <br />maximum levels for fecal streptococcus the presence of which is used as a <br />indicator of animal fecal material. We have no guidelines for interpreting the <br />number of fecal streptococcus found in the samples that were taken at Forest <br />Bay of Lake Minnetonka. <br />HENNEPIN COUNTY <br />an equal opportunity employer <br />