Difference between revisions of "EE CompliancePatternTrend"

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[[Exceptional Event Evidence|Exceptional Event Evidence]]  
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[[Evidence for Exceptional Events|Evidence for Exceptional Events]]  
 
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==What Evidence is Required to Flag an Exceptional Event? (EE)==
 
==What Evidence is Required to Flag an Exceptional Event? (EE)==

Revision as of 17:14, November 12, 2007

< Back to Exceptional Event Workspace

Evidence for Exceptional Events

What Evidence is Required to Flag an Exceptional Event? (EE)

The Exceptional Events Rule requires states that flag data to satisfy the requirements of 40 CFR 50.14 (c)(3)(iii) to provide evidence that:

  1. The event satisfies the criteria that it was not reasonably controllable or preventable
  2. There would have been no exceedances or violation but for the event.
  3. The event is associated with a measured value in excess of historical values.
  4. There is a clear casual relationship between the measured value and the event

1. Evidence: Not Reasonably Controllable or Preventable

This line of evidence needs to establish that the event is 'not reasonably controllable or preventable'. The EE Rule identifes different categories of uncontrollable events:

  • Exceedances Due to Transported Pollution (Transported African, Asian Dust; Smoke from Mexican fires; Smoke & Dust from Mining, Agricultural Emissions)
  • Natural Events (Nat. Disasters.; High Wind Events; Wildland Fires; Stratospheric Ozone; Prescribed Fires)
  • Chemical Spills and Industrial Accidents; Structural Fires; Terrorist Attack


ForestSmokePic.png DustFrontPic.png Volcano.png July4th 04 S.png

2. Evidence: The Exceedance or Violation would not Occur, But For the Exceptional Event

According to the EE Rule, observationas can be EE-flagged if the vioaltion is caused by the exceptional event.

  • The leftmost figure shows a case when the 'exceptional' concetration raises the level above the standard. A valid EE to be flagged.
  • In the next case, the concentration from controllable sources is sufficient to cause the exceedance. This is not a 'but for' case and should not be flagged.
  • In the third case, there is no exceedance. Hence, there is no justification for an EE flag.

The 'exceptional' concetration raises the level above the standard The 'exceptional' concetration raises the level above the standard The 'exceptional' concetration raises the level above the standard
Illustration Exceptional Events, EE and non-EE events by the EE Rule.

3. Evidence: The Event is in excess of the Historical Values

1999-2001

2000-2002

2001-2003

2002-2004

2003-2005

2004-2006

2005-2007

4. Evidence: Clear Causal Relationship between the Data and the Event

There are multiple lines of evidence that can support the relationship between observations and the event. In the Exploratory Study the following lines of evidence were suggested:

  • Chemical Signature
  • Observed Pollutant Source and Transport
  • Spatial Pattern of Pollutant
  • Temporal Pattern of Pollutant

However, additional lines of evidence should be considered and illusterated. Community participation would be most desirable.