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Updates on Standards

Updates on Standards. Jennifer Zwicke NRCS Environmental Engineer. 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

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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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