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Updates on Standards

This document outlines significant revisions to the Agricultural Waste Management Field Handbook (AWMFH) Appendix 10D, which includes updated design and construction guidelines for waste impoundments lined with clay or amendment-treated soil. The acceptable specific discharge has been updated from 1 x 10^-5 cm/s to 5000 gallons per acre per day. Additionally, it discusses achieving optimum compaction for low permeability, the importance of undisturbed sampling, and changes in soil test usage based on manure application history for risk assessments.

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Updates on Standards

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  1. Updates on Standards Jennifer Zwicke NRCS Environmental Engineer

  2. Revision to AWMFH • Revision to Ag Waste Management Field Handbook Appendix 10D - Design and Construction Guidelines for Waste Impoundments Lined with Clay or Amendment Treated Soil • In cases where manure sealing is occurring: Acceptable specific discharge is changing from 1 X 10-5 cm/s (9,240 gallons per acre per day) to 5000 gallons per acre per day. • different units for specific discharge and coefficient of permeability because terms are often confused • gallons per acre per day for specific discharge • feet per day or centimeters per second for permeability

  3. Revision to AWMFH (cont) • Expanded discussion on: • importance of achieving compaction wet of optimum to achieve the lowest possible permeability in a compacted clay • bentonite treated and soil dispersant treated liners • perimeter drains • properties of completed structure, including obtaining undisturbed samples, performing density/water content measurements during construction, and whole lagoon seepage measurements • concept of progressive design

  4. Waste Treatment Lagoon 359 • Updated January 2006 • Very similar to previous (1999) version. When Appendix 10D is finalized, this practice will be affected

  5. Solid Liquid Waste Separation 632 • Updated January 2006 • Add more specific separator efficiencies

  6. Pond Sealing or Lining - Flexible Membrane 521A

  7. Proposed changes to 590 • For the risk assessment (P Index) and the annual nutrient budget where there is no history of animal waste application on the unit, a soil test less than 5 years old can be used • For the risk assessment (P Index) and the annual nutrient budget where there is a history of animal waste application on the unit, a soil test no more than 1 year old will be used. • Time between manure test date and application date will be no more than one year • allow rotational P205 manure application equal to recommended P or crop uptake for the crop rotation (or multiple years of the rotation) only on sites with a P Index rating of low or medium

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