AMC (http://amitco.org) is working the SCDOT to develop a unique In-Lieu Fee (ILF) Program. When approved, the program will use guidance from RGL 18-01 to generate mitigation credits through the repair and replacement of perched and undersized culverts. TRB recently included an article about the program in one of their newsletters. Check it out here:
https://environmentalanalysis974038017.wordpress.com/2021/02/12/s-c-infrastructure-repairs-to-generate-mitigation-credit-a-story-of-rgl-18-01/