Hollingsworth and Vose

​​​​​The Emissions Inventory provides information on all the Toxic Air Contaminant emissions from a facility, and includes information on a facility’s operations and activities, as well as fuel and material usage rates. This is often the longest step in the CAO risk assessment process as DEQ needs to verify that all activities have been accounted for, and that the most representative emissions data available are used. In some cases, DEQ will require a facility to perform source testing at this stage if insufficient data is available to estimate emissions. ​

For an introduction to emissions inventories and why they matter, please see EPA's Fact Sheet. A facility-specific emissions inventory timeline and associated documents are linked below. 

Jan. 10, 2022: Facility called in to CAO program.

• Call in letter​
  

​April 11, 2022: Facility submitted emissions inventory and supporting information.

• Emissions Inventory Cover Letter​
  

June 8, 2022: DEQ responded to the Emissions Inventory submittal with a request for revisions and additional information. 

• DEQ Response letter​​

June 21, 2022: Facility submitted Emissions Inventory extension request.

​The Modeling Protocol provides information on how the facility plans to accurately model the concentrations of Toxic Air Contaminants (TACs) that community members may be exposed to based on the TAC emissions data from the approved Emissions Inventory. A Risk Assessment Work Plan is required for more complex Risk Assessments (Level 3 or Level 4) and provides more detailed information about locations where people live or normally congregate around the facility and how risk to these community members will be evaluated.

March 25, 2025: DEQ approved the risk assessment

• DEQ Approval Letter​

July 13, 2023: Facility submitted a Modeling Protocol 

• Modeling Protocol 
  
• Crosswalk of Receptors​​​

Aug. 10, 2023: Facility submitted a Risk Assessment Work Plan

The Risk Assessment provides the summary of findings on potential risks to the surrounding community from emissions of Toxic Air Contaminants (TACs) from this facility. The assessment indicates the exposure location(s) in the community with the highest potential Cancer and Noncancer health risk, and DEQ uses this information to regulate TAC emissions from the facility. In some cases, the risk may be very low and no further action may be required, or the risk may exceed health-based standards where DEQ can require risk reductions. In most cases, permit conditions will be developed and included in a facility's air quality permit to regulate TAC emissions based on the results of the risk assessment.​

Oct. 18, 2024: Facility submitted the Risk Assessment Report

• Risk Assessment ​Report​

Jan 17, 202​5: DEQ responded to the Risk Assessment Report with a request for revisions and additional information.

• DEQ response letter​
  

Feb. 18, 2025: Facility submitted a revised Risk Assessment Report

• Cover Letter
• Risk Assessment Report ​
  

March 14, 2025: DEQ requested minor revision to the Risk Assessment Report

• DEQ request email
  

March 19, 2025: Facility submitted a revised Risk Assessment Report

• Risk Assessment Report

March 25, 2025: DEQ approved the Risk Assessment.

• DEQ Approval Letter​