(1) "Benchmark for excess lifetime cancer risk" means:

(a) For a new or reconstructed air contamination source, an excess lifetime cancer risk level of 10 in one million.

(b) For an existing air contamination source, an excess lifetime cancer risk level of 50 in one million.

(2) "Benchmark for excess noncancer risk" means:

(a) For a new or reconstructed air contamination source, a benchmark equal to a Hazard Index number of 1.

(b) For an existing air contamination source, a benchmark equal to a Hazard Index number of 5.

(3) "Hazard Index number" means a number equal to the sum of the hazard quotients attributable to toxic air contaminants that have noncancer effects on the same target organs or organ systems.

(4) "Hazard quotient" means a calculated numerical value that is used to evaluate noncancer health risk from exposure to a single toxic air contaminant. The calculated numerical value is the ratio of the air concentration of a toxic air contaminant to the noncancer risk-based concentration at which no serious adverse human health effects are expected to occur.

(5) "Reconstructed" means an individual project constructed at an air contamination source that, once constructed, increases the hourly capacity of any changed equipment to emit and where the fixed capital cost of new components exceeds 50 percent of the fixed capital cost that would have been required to construct a comparable new source. [2018 c.102 §2]

Note: The amendments to 468A.335 by section 10, chapter 102, Oregon Laws 2018, become operative January 1, 2029. See section 9, chapter 102, Oregon Laws 2018. The text that is operative on and after January 1, 2029, is set forth for the user’s convenience. As used in ORS 468A.335 to 468A.343 and section 7, chapter 102, Oregon Laws 2018:

(1) "Benchmark for excess lifetime cancer risk" means:

(a) For a new or reconstructed air contamination source, an excess lifetime cancer risk level of 10 in one million.

(b) For an existing air contamination source, an excess lifetime cancer risk level established by the Environmental Quality Commission by rule, but no less than 25 in one million.

(2) "Benchmark for excess noncancer risk" means:

(a) For a new or reconstructed air contamination source, a benchmark equal to a Hazard Index number of 1.

(b) For an existing air contamination source, a benchmark equal to a Hazard Index number established by the commission by rule.

(3) "Hazard Index number" means a number equal to the sum of the hazard quotients attributable to toxic air contaminants that have noncancer effects on the same target organs or organ systems.

(4) "Hazard quotient" means a calculated numerical value that is used to evaluate noncancer health risk from exposure to a single toxic air contaminant. The calculated numerical value is the ratio of the air concentration of a toxic air contaminant to the noncancer risk-based concentration at which no serious adverse human health effects are expected to occur.

(5) "Reconstructed" means an individual project constructed at an air contamination source that, once constructed, increases the hourly capacity of any changed equipment to emit and where the fixed capital cost of new components exceeds 50 percent of the fixed capital cost that would have been required to construct a comparable new source.