Micropile and Rock Anchor Walls Jaime Boris Irahola, M.S., P.E.,; Andy McCook, P.E., California DOT, Irvine, CA Cantilever Soldier Pile Wall Steel Design: AASHTO LRFD vs. AASHTO 17th Edition Jim Schettle, P.E., S.E., Jacobs Engineering, Bellevue, WA Tired Derived Aggregate Backfill for Retaining Walls Dana N. Humphrey, Ph.D, P.E., University of Maine, Orono, ME James L. Foster, Jr., P.E., Quincy Engineering, Inc., Sacramento, CA