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The average 1,000 pound horse produces 56 pounds of manure per day (U of MN <br />extension). 25 horses may produce 511,000 pounds of manure in a year. The <br />volume of soiled stall bedding and manure for one horse can be estimated at 2.4 <br />cubic feet/day (Penn State extension). 25 horses would produce approximately <br />21,900 cubic feet/year. <br />The existing 8'X4'X4' box on site is 128 ft3. It would fill up 178 times in a year. Three <br />such boxes on site would fill up about 60 times each in a year. <br />Once the temporary bin(s) are filled the applicant is proposing to store the excess <br />manure in a permanent storage box, spread it on site, or make it available to the <br />public for private use. <br />Analysis: <br />In MN State rule 7020.2005, it is stated that a new manure storage area must not be <br />constructed within a floodplain. Also, an existing manure storage area located in a <br />floodplain may not be expanded. <br />MN State rules state that for manure application, a minimum setback of 300 feet from <br />protected wetlands is required. A 50 foot non-manured vegetated buffer can be used <br />in place of the 300 foot setback during non -winter months. <br />MPCA prohibits manure spreading on floodplains. <br />U of MN extension guidelines recommend against spreading on pasture with more <br />than one horse per two acres. <br />No well location was noted on site plan. Manure storage should be located a <br />minimum of 100' from a domestic well. <br />Recommendation: <br />There is very limited storage capacity on site, due to setback requirements from both <br />the protected wetland and floodplain. Feasibility of spreading on site will also be <br />quite limited for the same reasons. As noted by the applicant's narrative, disposal is <br />more difficult during winter months. This leads to the need to provide for up to 6 <br />months of storage on site or other permanent removal solution. <br />The majority of the manure produced on this site will have to be removed. A more <br />detailed plan for hauling that volume off site should be required before any expansion <br />of animals units is considered. <br />• Page 2 <br />• <br />• <br />• <br />