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(2) Minnesota Pollution Control Agency Feedlot Program Feedlot Rule Summary, February 2001 Exceptions to establishing a vegetative cover between the county feedlot officer may review them by stockpiling use is made for cattle at open lots with request. The records should include information on: 100 animal units or less and where the stockpile is • Location of each stockpile land-applied in fewer than 10 days. The latter • Date it was piled exception is only allowed six times per year. • Volume of manure in the stockpile • Nitrogen and phosphorus content of the manure Short-term stockpiles cannot be located within: • Date when the stockpile was land-applied 1. 300 feet of flow distance and at least 50 feet horizontal distance to surface water, sinkholes, Permanent Stockpile Sites rock outcroppings, open tile intakes, and any Manure stockpiled for more than one year needs to be uncultivated wetlands which are not seeded to placed on a pad. The owner may need to install a annual farm crops or crop rotations involving liquid manure storage area to collect the runoff if perennial grasses or forages. necessary to prevent manure-contaminated runoff 2. 300 feet of flow distance to any road ditch that from discharging to surface and ground water. The flows to the features identified in Number 1 above owner must apply for a construction short form permit or 50 feet of any road ditch where Number 1 does if the manure results from 300 to 999 animal units or, not apply. apply for a NPDES/SDS permit for manure from 3. 100 feet of any private water supply or unused- 1,000 or more animal units. unsealed well and 200 feet from any private well with less than 50 feet of watertight casing and that Cohesive Soil Pads is not cased through a confining layer at least ten Soils Investigation feet thick. A soils investigation to determine the depth to ground 4. 100 feet from field drain tile that is three feet or water and the estimated depth to the seasonal high- less from the soil surface. water table must be completed prior to construction. The seasonal high-water table is determined from soil A minimum distance of two feet between the base of color readings conducted by a qualified soils analyst. the stockpile and the seasonal high-water table or Interpretation of soil colors to determine seasonally saturated soils must be maintained. The most recent saturated conditions should be done in accordance USDA/NRCS Soil Survey Manual can be used or a with soil taxonomy(United States Department of site-specific soils investigation can be done. Agriculture). Stockpiles are also prohibited: A minimum of two soil borings must be taken(within • On land with greater than six-percent slope. the boundaries of the proposed site) for the first 1/2- • On land with slopes between two and six percent, acre of stockpile surface area. A minimum of one except where clean-water diversions and erosion- additional soil boring must be taken for each control practices are installed. additional one acre of stockpile surface area. These • On soils where the soil texture to a depth of five borings must be performed on a pattern which feet is coarser than a sandy loam as identified in represents the range of soil conditions throughout the the most recent USDA/NRCS Soil Survey Manual stockpile site. The elevation and location of each soil or based on a site-specific soils investigation. boring, relative to the site must be recorded. Recordkeeping for Short-Term Stockpile Construction of Cohesive Soil Pad Sites When constructing the pad, it is very important to The owner of the feedlot where the manure was remold and compact the soil so that voids and lift produced must keep records on file for each manure interfaces are eliminated. The goal during cohesive stockpile site for at least three years. MPCA staff or Stockpiling of Manure Page 3