In response to the NOV/FOVs and continued U.S. EPA pressure on Republic Engineered Products, Inc to bring its steel mill into compliance with environmental regulations, Republic spent a large sum of money upgrading and replacing the primary and secondary pollution control devices controlling emissions from its BOP vessels N and L. The exact amount of all the expenditure submitted to U.S. EPA was over $18 MM. Republic implemented a $6 MM project upgrading the BOP vessel L pollution control device. Another $2 MM was spent by May 2006 on pollution control devices for BOP vessel N, with an additional $4 MM project completed by the end of 2006. Amongst an extensive number of upgrades to the pollution control devices were: 1) Replacement of carbon vessel skirt, trough, and blades with aluminum-bronze. This is because aluminum-bronze is more durable and lasts longer, and is less prone to breakage; 2) installation of relief door panel; 3) installation of new repair door with better seal on the vessel; 4) replacement of various sections of hood system such as C1 panel, G1 East & West panels, and shaft panels; 5) replacement of Section 2 hood system; 6) Change out vessel L Lower G2 panel; 7) replacement of Section 3, Section 1, east and west walls of shafts, north and south heavy walls, C2 panel, G2 East & West panel, B panel, and transition section; 8) New reverse osmosis system for hood system, with a 30,000-gallon storage tank available for both vessels L &