On February 26, 2018, Region 10 filed an administrative complaint against Wheeler Rock Products (Wapato, Washington) to resolve violations of the Clean Air Act (CAA). Wheeler Rock Products failed to obtain a preconstruction permit under the Tribal Minor New Source Review program, or an air operating permit under the Title V of the Clean Air Act. Respondent also failed to timely provide the required notifications and conduct the performance test as required by the new source performance standard for nonmetallic mineral processing plants (NSPS Subpart OOO). On August 21, 2017, the region sent an opportunity to confer letter to the company inviting the company to resolve the alleged violations prior to filing an administrative complaint. The company has refused to meaningfully engage in settlement negotiations to date.