OdorWorksheet

Odor Score CalculationWorksheet No. 2: 

Odor Score Calculation Worksheet No. 2 WI Department of Agriculture, Trade & Consumer Protection

What you learned in Workshop 1: 

What you learned in Workshop 1 Reasons for the siting law. How the siting law can affect individuals and their community. The limitations of the siting law and the need for other local planning. The reasons for the five siting standards. How to calculate animal units.

What you learned in Workshop 2: 

What you learned in Workshop 2 Why there is an odor standard How to fill out or review the following worksheets: Waste and Nutrient Management Waste Storage Runoff Management Standards

Learning objectives:: 

Learning objectives: Learn how to calculate the odor standard Increase awareness and understanding of what is involved with implementing the law Learn how to assist owners and operators with managing odors on their farms

Odor 101: 

Odor 101 What smells and why? What constitutes a nuisance? How is odor measured and evaluated? Practices: How can odors be mitigated? What are the health and safety effects of odors? How are odors related to air emissions?

What smells and why?: 

What smells and why? Odors made up of 200 compounds Worst odors from anaerobic decomposition Major livestock sources Manure storage Animal housing Animal lots Odors are a nuisance, but also have health impacts Toxicity Irritants Stress

What factors contribute to smell?: 

What factors contribute to smell? Source Weather Topography Other Odor events Management Dust Control Moisture

How is odor measured and evaluated?: 

How is odor measured and evaluated? Olfactometry Dilution to detection threshold N-Butonal Comparison to stinky substance to establish intensity Modeling Weather component Dispersion

What constitutes an odor nuisance?: 

What constitutes an odor nuisance? Character Intensity Frequency Duration

Control practices: How can odor be mitigated?: 

Control practices: How can odor be mitigated? Source reduction Dissipation Masking

What are the health effects of odor?: 

What are the health effects of odor? Varies due to sensitivity to odors and intensity of odors Stress Headaches and dizziness Eye, nose, throat irritation Drowsiness Mood and memory

How are odors related toair emissions?: 

How are odors related to air emissions? Related, but not the same Air Emissions = odor, gases, and dust Example: Hydrogen sulfide and ammonia are independent chemical compounds released into the air and may be regulated separately Odor is how compounds such as ammonia and hydrogen sulfide interact with each other, and then impact the human olfactory sense

Odor standard basics: 

Odor standard basics Predictive Standard Enforcement = compliance with practices, not “sniff tests” Some level of odor is acceptable Considers odor from structures only Does not consider odor from land spreading

Who must meet the odor standard?: 

Who must meet the odor standard? Only those applying for a siting permit REQUIRED (within 2,500 feet of neighbor) Expanding operations over 1,000 AU New operations over 500 AU OPTIONAL Expanding operations under 1,000 AU New operations under 500 AU Operations farther than 2,500 feet from neighbor

Odor score elements: 

Odor score elements Type of operation Surface area and location of structures Location, density, and type of nearby neighbors Management of the operation

Example Odor Score CalculationFarm AManitowoc County: 

Example Odor Score Calculation Farm A Manitowoc County

Slide18: 

Proposed Expansion

Slide25: 

Find your nearest affected neighbor.

Slide26: 

Measure distance from each housing, storage, and animal lot to the nearest affected neighbor

Slide27: 

You will need: the occupied area of the housing structures and surface area of storage and lots. Calculate predicted odor from all non-exempt structures. Take credit for odor control practices.

Odor control practices: 

Odor control practices 8 Housing practices 12 Storage practices 4 Feedlot practices

Slide29: 

You will need: the occupied area of the housing structures and surface area of storage and lots. Calculate predicted odor from all non-exempt structures. Take credit for odor control practices.

Slide30: 

How to Measure Size of Manure Storage

Slide31: 

Determine the compass direction of your nearest affected neighbor, looking from your facility towards the neighbor. West

Slide32: 

Determine the density of neighbors within 1,300 feet of each structure. 5 or fewer and no high use buildings = low density 1 2

Management plans: 

Management plans Required (worth 80 points) Employee training Incident response Optional (worth 20 points) Advanced odor management plan

Odor score: 

Odor score 500 points or more = Pass If under 500 points: Add more practices Consider other options Relocate structures Make management changes Ask for 30 points - local discretion

Future expansions: 

Future expansions Use same reference point Density also “locked in” Add structures strategically Consider odor standard when making decisions

Slide36: 

N Nearest affected neighbor Fixing the future reference point Photos courtesy of USDA NRCS. Future reference point