"the I-99 site has many of the characteristics exhibited at the...

"the I-99 site has many of the characteristics exhibited at the Gilt Edge mine site
in South Dakota (Superfund site) where BauxsolTM Technology was tested by USEPA
Region 8 and a single application of treatment reagents has continued to produce
outstanding water quality results over the five year period since the treatment
was carried out."

This sounds fairly permanent. The treatment may last much longer than 5 years and even if they repeat the treatment every 10 to 20 years it is probably the best approach to solving the problem.