Establishing Air Cleanup Levels Under WAC 173340750

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Establishing Air Cleanup Levels Under WAC
173-340-750

• Pete Kmet, P.E.
• Department of Ecology
• Toxics Cleanup Program
• [phone] pkme461_at_ecy.wa.gov

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Establishing Air Cleanup Levels under WAC
173-340-750
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Establishing Air Cleanup Levels under WAC
173-340-750

• Sites needing to establish air cleanup levels
• SSRA for nonpotable groundwater
• SSRA for soil
• Emission limits
• Required by Ecology
• Note Concentrations caused by process emissions
  and off site sources do not need to be addressed.

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Establishing Air Cleanup Levels under WAC
173-340-750

• Cleanup Standard Concentration
• Point of Compliance
• ARARs
• Must use reasonable maximum exposure
• (defined as residential for most sites)

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Establishing Air Cleanup Levels under WAC
173-340-750
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Establishing Air Cleanup Levels under WAC
173-340-750
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Establishing Method B Air Cleanup Levels under
WAC 173-340-750(3)
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Establishing Method B Air Cleanup Levels under
WAC 173-340-750(3)
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Establishing Method B Air Cleanup Levels under
WAC 173-340-750(3)
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Establishing Method C Air Cleanup Levels under
WAC 173-340-750(4)

• Method C can be used for industrial properties
  and manholes and utility vaults.
• Method C can also be used where all practicable
  methods of treatment have been used
  institutional controls established and one of
  the following conditions exist
• Method A or B below technically possible
  concentrations
• Method A or B below area background
• Method A or B poses greater overall threat

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Establishing Method C Air Cleanup Levels under
WAC 173-340-750(4)

• Essentially the same as Method B except for
• Somewhat less stringent assumptions are used in
  the calculation of a cleanup level
• The allowable cancer risk is higher
• (1 X 10-5)

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Establishing Air Cleanup Levels under WAC
173-340-750

• TPH Mixtures
• Must evaluate noncarcinogenic effects of TPH
  Mixture as a whole
• Must evaluate ARARs, noncarcinogenic and
  carcinogenic effects for individual TPH
  components
• Need either measured or predicted air composition
  including TPH fractions and components

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Establishing Air Cleanup Levels under WAC
173-340-750

• Point of Compliance
• Throughout the site for most sites
• Industrial properties--up to property boundary

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Establishing Air Cleanup Levels under WAC
173-340-750

• Compliance Monitoring
• Soil vapor testing
• Indoor/outdoor air monitoring
• Stack testing
• If no ARAR
• Noncarcinogens use 24 hour average
• Carcinogens use annual average

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Establishing Air Cleanup Standards under WAC
173-340-750

• Summary
• Highlighted key differences
• Described what sites need to establish air
  cleanup levels
• No Method A air cleanup levels
• Establishing cleanup levels under
• Methods B and C.
• Special considerations for TPH mixtures
• Point of Compliance options
• Compliance monitoring requirements