golf vs. landfill

Today I learned that it's not economically feasible to build houses on an old golf course because there's too much arsenic in the soil from herbicides and pesticides. Here's the article from the Reading Eagle, but here's the quote if they move the article:

Before becoming a golf course, the site was a municipal landfill operated by Sinking Spring in the 1940s and 1950s, said borough engineer Robert B. Ludgate Jr. That facility closed in 1959.

“The results showed that the dump was not a great concern,” Ludgate said of the environmental testing. “They (Belovich Group) were concerned that they would have to remove 6 inches to 3 feet of the site that was treated with arsenic.”