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Air Toxics Monitoring and Analysis: Laboratory Performance Evaluation. Van Shrieves, Chief Monitoring & Technical Support Section. Background/Issues.

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air toxics monitoring and analysis laboratory performance evaluation

Air Toxics Monitoring and Analysis: Laboratory Performance Evaluation

Van Shrieves, Chief

Monitoring & Technical Support Section

background issues
Background/Issues
  • In 2006, Sonoma Technology Inc. completed a one year study focused on analyzing air toxics monitoring data collected by Region 4 state and local agencies from 1990 – 2005
  • Some of the key findings included:
    • Key risk drivers are not measured well enough to determine risk
    • Large differences in sampling and analysis methodology and MDLs among reporting agencies
    • MDLs in the Southeastern region are higher than in other areas of the nation
goals for addressing key issues
Goals for Addressing Key Issues
  • Conduct interlaboratory comparisons to establish consistency in the analysis methodology and MDLs between reporting agencies
  • Provide resources to regional laboratories such as training/information exchange and funding for analytical equipment upgrades
completed tasks
Completed Tasks
  • Regional air toxics workgroup formed with representatives from SC, Hillsborough County, FL, and EPA Region 4
  • MDL air toxics survey distributed by EPA Region 4; results showed a significant number of VOC MDLs are higher than benchmark MDLs provided by the NATTS TAD
  • Laboratory equipment survey distributed by EPA Region 4 showed some variations in systems used to analyze VOCs and carbonyls
next steps for 2008
Next Steps for 2008
  • Development of a Region 4 Organic Chemists Workshop – 1 to 2 day workshop primarily to allow for the exchange of information regarding methods used for VOC and carbonyl analyses and correlations to the MDLs
  • Performance studies – regional labs will participate in the NATTS proficiency testing in 2008
  • Assess equipment needs for laboratory upgrades and determine funding sources
state local agency support
State/Local Agency Support
  • Long-term Funding Commitment to address sampling and analytical needs and workshop/training participation
slide7

RL

RL

MDL

MDL

Health-based concentration

(e.g., Concentration = Risk of 1E-06)

Possible Analytical Sensitivity Points of Departure for Exposure Assessment (i.e., “risk-based DQOs for method sensitivity)

Concentration

ATRA indicates you should do it this way

zero