020-20 Wyo. Code R. § 20-36

Current through April 27, 2019

Section 20-36 - Application Controls

The animal waste management plan is part of the permit for a confined swine feeding operation and shall address storage, treatment, and land application of all animal waste produced at the feeding operation including liquid animal waste, manure slurry, solid manure, and sludge. The animal waste management plan shall demonstrate the use of best available technology (BAT) to control odors for all aspects of the operation. The use of animal waste generated by a confined swine feeding operation including liquid animal waste, manure slurry, solid manure, and sludge shall meet the following minimum standards:

(a) Animal waste that is land applied shall be applied at such rates and in a manner to prevent surface and groundwater contamination.

(b) Animal waste shall not be applied at a rate or in any manner that shall allow any surface runoff from the application site.

(c) Buffer zones shall be established for land application areas. Buffer zone requirements for land application are independent of the setback requirements as set forth in Sections 24, 25 and 26. In conjunction with other measures required by these regulations, buffer zones help provide pathogen and odor management.

(d) Animal waste applied at agronomic rates is exempt from the requirements of Chapter 3, Section 17, Wyoming Water Quality Division Rules and Regulations.

(e) The method for determining the required land treatment area for application of animal wastes shall be based upon the determination of the "agronomic rate" of the crops or vegetation present on the site. The application rate for animal waste constituents shall be limited to appropriate plant uptake values to protect surface and groundwater. The ratio used for this determination is expressed as:

Required Land Treatment Area = L/U

Where:

L= the yearly amount of the controlling constituent to be applied for land treatment. L is expressed in kilograms per year (kg/yr) or pounds per year (lbs/yr).

U= plant assimilative capacity = the yearly amount of the controlling constituent that can be assimilated by plant uptake. U is expressed in kilograms per hectare per year (kg/ha/yr) or pounds per acre per year (lbs/ac/yr).

(f) The following list of constituents shall be evaluated by the permittee to determine the controlling constituents. The method of selecting the controlling constituents shall be documented in the permit applications.

• (i) Organics.

• (ii) Nitrogen.

• (iii) Phosphorus.

• (iv) Metals.

• (v) Salts, acids, and bases.

(g) The initial selection of the constituents of concern shall be made by the permittee by estimating chemical make up of animal wastes based on published data or data available from similar operations and by sampling soils at proposed application sites. The constituents of concern selected once land application begins shall be derived from analyses of representative animal waste product samples and soil samples from the application sites.

(h) The permittee shall maintain records to demonstrate compliance with the animal waste management plan and monitoring and reporting requirements as specified:

• (i) Animal waste management plans shall be reviewed annually by the permittee and updated as necessary to reflect changes in procedures and management. Permittees shall notify the Division of any changes or updates to the plan and submit changes and updates for review and approval. A representative sample of the animal waste to be land applied shall be collected not more than thirty (30) days before every land application event. The permit shall identify the required sampling parameters. After a sufficient number of samples have been collected and analyzed, the Administrator may adjust the frequency of sampling or the parameters analyzed.

• (ii) The soils at each application site shall be sampled and analyzed at least annually before application of the animal waste. The analysis shall include the controlling constituents and phosphorus, potassium, nitrogen, copper, and zinc. The soil samples shall be taken at a minimum rate of one (1) for each ten (10) acres, or as required by variations in soil type. If the soil type is the same on adjacent ten (10) acre tracts, the samples from up to 40 acres may be composited for a single analysis. Soil samples shall be taken in the root zone and below the root zone before repeated seasons of application of animal waste.

• (iii) Written records shall be kept of all animal waste applied to the land. Records shall include:
  • (A) Date of application.
  • (B) Amount of animal waste applied.
  • (C) Identification of the application sites.
  • (D) Acreage of application sites.
  • (E) Method of application.
  • (F) Application rate.
  • (G) Crop or vegetation on the application sites.
  • (H) Plant assimilative capacity for controlling constituents.
  • (I) Concentration of controlling constituents in the animal waste.
  • (J) Amount of controlling constituents of concern applied to the site and soil samples to monitor controlling constituents of concern in the soil.

• (iv) All records shall be kept at the facility and made available to a representative of the Division upon request. All records shall be compiled in a format identified in the permit and shall be included in a report submitted to the Division annually.

• (v) The permittee is required to provide immediate oral notification and follow-up written notification to the Division of any violations or non-compliance with the terms and conditions of the permit including the animal waste management plan.

020-20 Wyo. Code R. § 20-36

Amended, Eff. 6/29/2018.