Notes
A memorandum from Jerald LaVassar of the Washington State Department of Ecology to Tom Luster evaluating construction techniques for a mechanically stabilized earth wall near Miller Creek related to the Third Runway at Sea-Tac International Airport. The memo addresses concerns about adverse foundation conditions that might require disturbing additional wetlands beyond the permitted footprint, concluding that techniques such as tied-back walls, bored piles, soil nailing, and ground freezing could restrict disturbance to the current proposed footprint. The author endorses the proponents’ conceptual scheme while recommending monitoring devices be incorporated into the wall and backfill.