There’s a sort of amusing story about them wanting to reuse the land over a couple of warmish areas by putting a shopping center there, and then when people pointed out that it might be a bit of a risk of exposure they changed the plan to be a golf course. The plan got trash-canned. By golfers.
I lived in the Tri Cities area for 38 years and can’t recall that story.
Areas with any detectable levels of radiation are well inside the boundaries of Hanford proper and not subject to any commercial development. The closest golf course and residential area would be Horn Rapids, about 20 miles from the nearest former disposal or contaminated area.
I have lived here for 50 yrs. or more. Never heard of that plan. They DID however build a golf course and now there are hotels etc; over what used to be the sewage treatment plant, which was called the Rose Bowl, because it was painted a pinkish color. That is just as you enter into Richland on George Washington Way.