Well there are a few reasons. Firstly I know how difficult it is to remove contamination from both soils and groundwater once it is there. I have been following very closely the unsuccessful efforts here in Elmira for the last 36 years. If talk and bull were cleanup they'd have been done many years ago. The so called cleanup efforts to the best of my knowledge in and around the Safety-Kleen site in Breslau have not been even 5% of the efforts, cleanup and pumping done both on the Uniroyal site as well as those done directly below ground in Elmira.
I have seen and read past groundwater monitoring reports done on the east side of the Grand River, between Safety-Kleen's operations and the Grand River. A large part of this area was and maybe still is owned by Forwell Gravell. These monitoring wells are not solely shallow groundwater but also deeper groundwater in which the nearby pumping wells are screened. Lots of various solvents are present presumably from earlier efforts to bring in dirty oil for recycling that unfortunately contained these solvents whether unintentionally or intentionally in order to get rid of them.
With my own eyes I have seen colour photographs of various excavations done on and near the Safety-Kleen site. I have seen sub-surface soil excavations of contaminated sites before whether the two Varnicolor sites in Elmira or the Uniroyal site also in Elmira. They are not a pretty picture and just like at Uniroyal, I expect that without massive on-site source removal, the site and surrounding groundwater will never be clean much less achieve even our modest drinking water standards.
Two wells for sure are on the east side of the Grand River and the rest recently mentioned in the K-W Record are on the west side of the river. However their well screens are well beneath the river bottom and pumping will easily draw water from the contaminated side, under the river and into the wells.
All of this combined with the likely Mickey Mouse upcoming Environmental Assessment will make for very bad quality drinking water. Bon appetit !