Twin City Concrete Products Company (TCC) manufactures and supplies cement-based construction products such as patching cement, anchoring cement, concrete crack filler, and non-shrink grout to home improvement stores. TCC has ten facilities in the Midwest and employs over 300 people. Two Minnesota facility locations ? Twin City Concrete Products at 1351 Troutbrook Circle, St. Paul, MN and Akona Manufacturing LLC at 1570 Halgren Road, Maple Plain, MN ? were inspected on August 15, 2012. Both facilities stored hazardous chemicals greater than the reporting thresholds, and both failed to timely submit complete Tier II inventory forms under EPCRA 312 for calendar years 2009 through 2011. A notice of Intent to file a Civil Administrative Complaint was issued on April 4, 2014. USEPA originally calculated a $76,840 proposed penalty, which was reduced for cooperation and settling before the complaint was filed. TCC agreed to pay a civil penalty of $12,487 to the U.S. Treasury within thirty days of the effective date of this CAFO, and conduct Supplemental Environmental Projects (SEPs) totaling $46,824, for a total settlement of $59,311. The SEPs include the installation of two bag houses to be used as a central vacuum to recover dust from floors and equipment, the installation of a rapid entry/exit door, and negative pressure system to reduce dust penetrating outside or into other areas of the facility, and install a tote, auger, and vacuum system in their batch mixing process to redu