Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 243 - Animal Feeding Operations › Subchapter II - Requirements for Large Concentrated Animal Feeding Operations › Section NR 243.141 - Manure stacking

Current through June 24, 2024
(1) STACKING TO AVOID SURFACE APPLICATIONS IN
				  FEBRUARY AND MARCH. For solid manure with a solids content of 16% or greater,
				  the department may approve stacking of the manure outside of a department
				  approved manure storage facility where a permittee chooses to stack solid
				  manure in accordance with s.
				  NR 243.14(6)
				  (d). Permittees choosing to stack solid
				  manure under s.
				  NR 243.14(6)
				  (d) shall land apply all stacked manure from
				  a site within 8 months of the date when stacking first began at the
				  site.
(2) OTHER STACKING
				  ALLOWANCES. For periods when the ground is not frozen or snow-covered, the
				  department may approve stacking of solid manure with a solids content of
				  greater than 32% outside of a department approved manure storage facility on a
				  case-by-case basis as allowed under a WPDES permit. Factors the department
				  shall consider when approving stacking of solid manure on a case-by-case basis
				  include the potential for leachate or runoff from the stack causing exceedances
				  of surface water or groundwater quality standards or impairments to wetland
				  functional values, information submitted or proposed to be submitted by the
				  permittee outlining leaching and runoff characteristics of the manure, and
				  practices to be implemented by the permittee to minimize the potential for
				  leachate or runoff from the stack such as limiting the frequency, volume of
				  manure to be stacked and length of stacking period.
(3) STACKING CONDITIONS. All proposed
				  stacking sites shall be reviewed and approved by the department and identified
				  in the permittee's nutrient management plan. Stacking approvals may be
				  rescinded based on documented impacts to waters of the state at or from the
				  stacking site. Stacking may only be approved provided the following
				  requirements are met:
(a) When piled in a
				  stack, the solid manure stack must be able to maintain its shape with minimal
				  sloughing such that an angle of repose of 45 degrees or greater is maintained
				  when the manure is not frozen.
(b)
				  Stacking of solid manure outside of a department approved manure storage
				  facility shall, at a minimum, meet the specifications in NRCS Standard 313,
				  Table 9, dated December 2005. Alternatively, stacks may be placed on sites with
				  soils in the hydrologic soil group D provided the manure has a solids content
				  of greater than 32% and all other criteria in NRCS Standard 313, Table 9, dated
				  December 2005, are met. NRCS Standard 313, dated December 2005, is incorporated
				  by reference in s.
				  NR
				  243.07.
Note: Copies of NRCS Standard 313, dated December 2005 and
					 documents referenced in this standard may be inspected at the offices of the
					 department, DATCP, NRCS, county land conservation departments and the
					 legislative reference bureau, Madison, Wisconsin.
(c) The permittee shall implement any
				  necessary additional best management practices to ensure stacking areas
				  maintain compliance with the production area requirements in s.
				  NR
				  243.13. Best management practices may include upslope
				  clean water diversions or downslope containment structures.
Note: Manure with a solids content of approximately 20% or
					 less may not meet the stacking criteria either because it cannot be stacked or
					 is prone to runoff. This manure may require storage in a constructed facility
					 during the months of February and March.
Note: Manure stacks are considered to be part of the animal
					 production area and are subject to production area discharge restrictions in s.
					 NR
					 243.13. For CAFOs, if a manure stack is not placed in
					 a containment or storage structure or the runoff from the stack is not
					 contained in a structure, discharges to navigable waters are not allowed under
					 any circumstance or storm event.
(d) The stacked manure shall have minimal
				  leaching so that leachate from the stack is contained within the designated
				  stacking area and does not cause an exceedance of groundwater quality
				  standards.
(e) Solid manure may not
				  be stacked in a water quality management area.
(f) Stacks may only be placed on
				  cropland.