The U.S. Army Corps of Engineers (USACE) Baltimore District is considering a re-procurement of an indefinite-delivery indefinite-quantity (IDIQ) for two chemical requirements: Aluminum Sulfate and Pol... The U.S. Army Corps of Engineers (USACE) Baltimore District is considering a re-procurement of an indefinite-delivery indefinite-quantity (IDIQ) for two chemical requirements: Aluminum Sulfate and Polyaluminum Hydroxychlorosulfate.