WATCH: What exactly is that giant black mound along I-5 in Tacoma?

Washington State Department of Transportation project engineer Neal Uhlmeyer provides a close-up look at the massive abutment being built adjacent to Interstate 5 in Tacoma. The wall, 45-feet-tall at its highest point, will match the existing grad
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Washington State Department of Transportation project engineer Neal Uhlmeyer provides a close-up look at the massive abutment being built adjacent to Interstate 5 in Tacoma. The wall, 45-feet-tall at its highest point, will match the existing grad