Or. Admin. Code § 340-242-0140
The target auto trip rate remains constant regardless of changes in work force size. Employers experiencing an annual increase or decrease in the number of employees reporting to a work site must simply maintain the target auto trip rate.
NOTE: For example, an employer has 200 employees and 180 autos arriving at the work site. The employer's baseline auto trip rate is 180 autos/200 employees, or .90. The target auto trip rate is .90 minus 10 percent, or .81. The employer's work force increases to 300 employees. The target auto trip rate remains .81. In order to maintain the target auto trip rate, auto trips to the work site cannot exceed (300 X .81), or 243 trips. Similarly, if the employer's work force decreases to 100 employees, the target auto trip rate remains .81, and auto trips to the work site cannot exceed (100 X .81) or 81 trips.
NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.
Or. Admin. Code § 340-242-0140
Stat. Auth.: ORS 468.020
Stats. Implemented: ORS 468A.363