Roberts is a chemical distribution, repackaging, reformulating, and chemical storage company. An inspection revealed unsafe storage conditions, including, among other things, the co-location of incompatible chemicals. Roberts had four chemicals on site in amounts that exceeded the threshold at which the Risk Management Plan regulations apply. Those chemicals were chloroform, pentane, ethyl ether, and hydrochloric acid. The order requires the company to separate incompatible chemicals as a first step in complying with 40 C.F.R. 68.7, and to submit a risk management plan in accordance with 40 CFR 68.10(a) and 12(a).