2021-12-07_REVISION - M2012032 (16)

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Part 4: Major Spill/Release Response 4.1 Response to a Major Spill/Release Due to the containment of unloading pad, tunnel slope and sump, the possibility of a major chemical spill/release outside of the Mill Area is very unlikely. However, the possibility is addressed below. A "major" spill/release is defined as one that exceeds a Reportable Quantity in accordance with (40 CFR Part 302) for a given chemical and cannot be safely controlled or cleaned up by facility personnel, such as when: • The spill/release exceeds a Reportable Quantity (RQ) • The spill/release is large enough to spread beyond the immediate spill/release area. • The spill/released material enters water. • The spill/release requires special equipment or training to clean up. • The spill/released material poses a hazard to human health or safety. • The spill is more than reportable quantities; or • There is a danger of fire or explosion. In the event of a major spill/release from the site, the following guidelines apply: • If there is a chance of an ignition or any other condition that would put site personnel at risk, all workers must immediately evacuate the spill/release site via the designated access road. • If the General Manager is not present at the facility, the senior on-site person notifies the General Manager of the spill/release and has authority to initiate notification and response. Certain notifications are dependent on the circumstances and type of spill/release. For example, if chemical reaches a sanitary sewer, the publicly owned treatment works (POTW) should be notified immediately. A spill/release that threatens Sneffels Creek may require immediate notification to downstream users such as the Ouray town drinking water plant. The General Manager (or senior on-site person) must call for medical assistance if workers are injured. • The General Manager (or senior on-site person) must notify the Fire Department or Police Department. • The General Manager (or senior on-site person) must call the spill response and cleanup contractors listed in the Emergency Contacts list in this section. • The General Manager (or senior on-site person) must immediately contact the CDPHE Colorado Office of Emergency Management: 303-273-1778 and the National Response Center (888-424-8802). • The General Manager (or senior on-site person) must record the call on the Spill/release Notification form in this section and attach a copy to this MCP Plan. • The General Manager (or senior on-site person) coordinates cleanup and obtains assistance from a cleanup contractor or other response organization, as necessary. If the General Manager is not available at the time of the spill/release, then the next highest person in seniority assumes responsibility for coordinating response activities. Materials Containment Plan (MCP) Page 25 of 33 May 2021