The public will now have until the end of September to comment on Alcoa's request to increase by 24 percent the amount of oil/grease, chromium, zinc, cyanide and other suspended solids it is allowed to discharge into the Mississippi River each month.
The higher volumes of chemicals contained in wastewater from the Riverdale plant are generated by the recently completed expansion of the facility to serve the automotive aluminum market.
The Iowa Department of Natural Resources (IDNR) ordered the notice be republished because of a mix-up in wording in some of the initial notices. The result was another 30-day period for the public to submit comments on the proposed change. Citizens can submit comments until Sept. 30 by email to: linda.hoehn@alcoa.com, or in writing to the company at 4879 State St., Bettendorf, IA 52722.