Therefore, prior to the 2001 Order, WCS was required to comply with NRC regulatory requirements and obtain an NRC specific license to possess SNM in quantities greater than amounts established in 10 CFR 150.11. The 2001 WCS exemption request to NRC proposed to use concentration-based limits rather than mass-based limits at a specific location at the WCS Site. The 2001 Order granted, and the subsequent ( printed page 17889) NRC Orders (2004, 2009, and 2014) continued the use of concentration-based limits and other conditions at specific locations at the WCS Site. The TCEQ incorporated the concentration-based limits and other conditions from each respective NRC Order (2001, 2004, 2009, and 2014) into the WCS license for the specific locations at the WCS Site where the concentration-based limits instead of mass-based limits and other conditions are applicable.