Air Toxics Health Risk Assessment Status
Cleaner Air Oregon is a health-based permitting program that regulates emissions of toxic air contaminants from facilities based on risk to nearby communities. CAO requires facilities to report toxic air contaminant emissions, assess potential health risks to people nearby and reduce toxic air contaminant risk if it exceeds legal limits.
As part of the Cleaner Air Oregon process, each facility has a dedicated web page to provide communities access to facility information and updates on where it is in the risk assessment process.
- Each step of the CAO risk assessment process has a section that includes DEQ's communications and deliverables with the facility.
- The color-coded graphic below shows where a facility is in the Cleaner Air Oregon process.
- For additional information and history of the program, visit the Cleaner Air Oregon web page
An Emissions Inventory is a list of each toxic air contaminant regulated under the Cleaner Air Oregon rules that a facility emits in a given year. The Emissions Inventory includes the amount of each toxic air contaminant emitted from each individual emissions-producing activity.
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.
Oct. 9, 2020: STACK Infrastructure submits Emissions Inventory
April 2, 2021: STACK Infrastructure submits revised Emissions Inventory
April 7, 2021: DEQ approves revised Emissions Inventory as part of Level 3 Risk Assessment
A Modeling Protocol outlines parameters used in the dispersion modeling portion of the health risk assessment. This document identifies sensitive receptors at which risk will be assessed and outlines modeling parameters to be used in the facility's dispersion modeling.
Oct. 9, 2020: STACK Infrastructure submits Modeling Protocol and Risk Assessment Work Plan to DEQ
April 2, 2021: STACK Infrastructure submits revised Modeling Protocol and Risk Assessment Work Plan to DEQ (includes March 7, 2021 cover letter)
April 7, 2021: DEQ approves Modeling Protocol and Risk Assessment Work Plan as part of Level 3 Risk Assessment
A Risk Assessment Report shows the results of the health risk assessment following the approved emissions inventory, modeling protocol and risk assessment work plan.
March 15, 2021: STACK Infrastructure submits Risk Assessment Report to DEQ
April 2, 2021: STACK Infrastructure submits revised Risk Assessment Report to DEQ (includes March 7, 2021 cover letter)
April 7, 2021: DEQ approves Risk Assessment Report as part of Level 3 Risk Assessment
April 7, 2021: DEQ approves Level 3 Risk Assessment
About the Facility
SI PORL3, LLC.* (STACK Infrastructure) applied for a Standard Air Contaminant Discharge Permit for a prospective data center to be located at 4735 NE Starr Blvd., Hillsboro, Oregon. The facility proposes to install 49 diesel-fired emergency generators each rated at 3,000 kilowatts of electric capacity.
*STACK Infrastructure changed its name from SI PORL2 to SI PORL3 during their risk assessment process.