Mitigation costs may include:

1. (1) Sound walls/berms: Unless required by specific regulations, TIB will not participate in this cost.
2. (2) Superfund sites: TIB funds will not participate in the cost of cleanup.
3. (3) Bridges: Bridge designs exceeding the most cost effective are not eligible for participation.
4. (4) Wetlands: Mitigation in excess of what is required by federal or state requirements is not eligible to be reimbursed.

5. (5) Stormwater treatment: Treatment in excess of what is required by federal or state requirements is not eligible to be reimbursed.

   Transportation improvement board funds may not be used for excessive design, mitigation beyond federal or state requirements, or other unusual project features.

[Statutory Authority: Chapter 47.26 RCW. WSR 23-08-032, § 479-05-131, filed 3/28/23, effective 4/28/23; WSR 12-08-060, § 479-05-131, filed 4/3/12, effective 5/4/12; WSR 07-18-050, § 479-05-131, filed 8/30/07, effective 9/30/07.]