The Oregonian recently ran two articles (here and here) about the Zidell Marine site in Portland's South Waterfront area. The site is on the west side of the Willamette, bisected by the Ross Island Bridge and abutting the north edge of all those new towers down there.
The issues raised in this and this article involve at least two complex and longstanding themes that reflect society's changing values. One theme is the conflict that often arises as land uses change over time, pitting long-established uses with more economically lucrative development opportunities. The other is the need to clean up environmental hazards based on previous land uses. It's here at the pivotal moments of these changes & conflicts that we historians like to poke around a bit, write up some things, and, thereby, try to make some sense of.