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Microbial Air Sampling Results —Centerville Irrigation System <br />Summary <br />The Minnesota Department of Health (MDH) has received preliminary results for microbial air <br />sampling of the Centerville stormwater irrigation system. While some microbes were detected, the <br />results are not unusual for water that is accessed by water fowl and other wildlife. Based on the data <br />collected during this one -day sampling event (described below), we currently recommend continuing <br />to operate the sprinklers during the overnight hours when the park is not in use. <br />Introduction <br />Microbial air sampling during operation of stormwater irrigation sprinklers was completed on <br />October 4, 2016 in Laurie LaMotte Park in Centerville, MN. Dr. Mark Borchardt and staff from the U.S. <br />Department of Agriculture and U. S. Geological Survey in Marshfield, WI, and Dr. Tim La Para from the <br />University of Minnesota in Minneapolis conducted the sampling and analyses. <br />A complete description of the sample methods will be published at a later time. A general summary is <br />as follows: Samples were collected from one sprinkler head on the southeast side of the park. Three <br />trials were run during daylight hours, with each trial lasting roughly one hour. Five button samplers <br />(to collect material for genetic analysis) and five Andersen samplers (to collect material for lab <br />cultures) were set at distances of 275, 325, 425, 525, and 625 feet from the sprinkler. A control <br />sampler (to sample air without the irrigation spray) was set up to the side of the running sprinkler, <br />out of the trajectory of the irrigation spray. Water samples directly from the pond which supplies the <br />sprinkler were also collected, in addition to a sample directly from the sprinkler head. <br />The researchers tested for the following microbes: <br />Organism name <br />Type of <br />Example of common symptoms in humans caused <br />Microbe <br />by an infection with the microbe <br />Adenovirus <br />Virus <br />Dermal, Respiratory, Gastrointestinal <br />A; B; C, D, F <br />Avian influenza <br />Virus <br />Usually respiratory symptoms in birds; occasionally <br />infects humans, resulting in influenza <br />Enterovirus <br />Virus <br />Dermal, Respiratory, Gastrointestinal, Paralysis <br />Human <br />Virus <br />Cancer (long term) <br />Polyomavirus <br />Minnesota <br />Department of Health <br />100 <br />