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f Minnesota Pollution Control Agency Feedlot Program Feedlot Rule Summary, February 2001 A new manure storage area may not be constructed Depth to the seasonal high water table: The within 1,000 feet of a community water-supply well thickness of the soil layer(s) above the water table or wells serving a public school,private school also is a factor in site selection. Saturated soils do not (excluding home sites)or a licensed child care center treat pollutants nearly as well as unsaturated soils. where the well is vulnerable according to Minnesota Saturated soils also allow much more rapid Department of Health standards. Unless, the percolation compared to unsaturated soils. The Minnesota Department of Health has approved a percolation time and contaminant treatment of the drinking water supply management area for the well, effluent through the soil depends on the soil type and the manure storage area is not within the drinking total depth of the unsaturated soil profile. Thicker water supply area, and the manure storage area is not unsaturated soil profiles lessen the risk of ground- within 200 feet of the well. water contamination. In addition, stockpile sites may not be located in rock Karst topography and other fractured bedrock: quarries, gravel pits, sand pits, or any other mining The depth to bedrock is another important excavation sites. consideration. Ground-water vulnerability is increased by fractured bedrock which provides a A manure storage area may not be located: direct conduit from the soil layer to the deeper ground • Shoreland water. Sinkholes also provide a direct conduit to • Floodplain ground water, allowing little to no contaminant • 300 feet of a sinkhole treatment. Therefore,manure must not be stockpiled • Within 100 feet of a private well with at least 50 within 300 feet of a sinkhole. feet of watertight casing Agronomic Need of the Crop In general, manure stockpiling sites must be located The size of a short-term stockpile is limited to what and constructed such that manure-contaminated the crop will need. The largest allowed stockpile is runoff from the site does not discharge to surface the volume needed to fertilize crops on a 320-acre water and ground water. field. Stockpile Site Selection Based on Soils Requirements for Short-Term Manure To prevent a pollution problem from developing, Stockpiling manure cannot be stockpiled in rock quarries, gravel The MPCA has developed the following requirements or sand pits, on bedrock or on any mining excavation beginning October 2001, for the stockpiling of all sites. Other considerations include: manure and/or bedding material containing manure: Soil permeability and soil layer profile: The Manure may not be stockpiled for more than one permeability of the soil,a measure of how fast water will year. The same stockpile site cannot be used from percolate through the soil,is an important consideration year to year. All of the accumulated manure is in determining if a site is suitable for stockpiling manure. required to be removed from the site at least once per Sandy soil has a high permeability and will allow water- year and spread on cropland at agronomic rates as borne pollutants to leach quickly through the soil layers fertilizer. A vegetative cover must then be to the ground water. On the other hand,denser soil or established on the site for at least one full growing clay will prevent the leachate from flowing through the season before the site can have manure stockpiled on soil profile at such a rapid rate,and will hold the effluent it again. longer allowing more contaminant detention and treatment. Stockpiling of Manure Page 2