The Iowa Department of Natural Resources may be taking action against Hy-Vee after it released 800 gallons of milk from its store at 410 N. Ankeny Blvd. The DNR first reported the incident Wednesday morning when the Fourmile Creek in Ankeny was being impacted by the release of milk. Authorities traced it back to the Hy-Vee store where the company said an employee chose to dump the milk after the power outage caused by the derecho Monday. Hy-Vee has released the following statement, "A Hy-Vee employee at our Ankeny store made an uninformed decision when instructing others on how to dispose of milk that had gone bad due to the recent power outages caused by Monday’s storms. The moment this was brought to our attention, we immediately began working with the City of Ankeny, DNR and a third-party environmental cleanup company to address any potential issues. We are covering all costs related to the cleanup. We also have enrolled the employees involved in environmental education training with the DNR so this does not happen again in the future."The third-party environmental firm worked Wednesday night, constructing small dams so they could soak up the milky water. Furthermore, DNR Supervisor Ted Peterson said, "Materials that we think are harmless can actually be very toxic to the environment. When disposing of a liquid into the municipal collection system, it's important to check with local water waste treatment plant or DNR field office prior to disposal."On Thursday, the DNR announced that fish are appearing at the surface, dead in a span of a half of a mile in the Fourmile Creek. As of right now, the dead fish consists of minnows and small game fish, according to the DNR. The DNR is still investigating the incident, but said it "will consider appropriate enforcement action, which may include fish kill restitution."