2019-12-05_HYDROLOGY - M1999058 (4)

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Overview On Wednesday, October 16, 2019, the Pride of America Mine (PAM) operated by CSQ reported a spill of—5,500 gallons of dyed off-highway diesel fuel from its operating above-ground storage tanks. This release resulted in contamination of the road fill material (-169,000 CY) of CSQ's haul road within the permit boundary. The timeline of discovery events, explanation of factors contributing to the spill, mitigation procedures, and remediation plans are provided below. As to potential impacts associated with the spill, based on currently available information: • NO diesel appears to have left the site and the full spill appears to be contained within the road fill material and the sump at the toe of the fill material. • NO detectable amounts of diesel entered Yule Creek and the terminal berm and booms with the sump provide adequate redundancy within the sump at the toe of the fill material. • NO detectable discharge of contaminated water occurred at any time during the initial spill and through mitigation and the start of remediation. • Discharge of clean water via seepage through the terminal berm occurred and this water was sampled and yielded no detectable diesel limit values. • NO damage to persons or off-site properties occurred during any phase of the spill and resultant mitigation and remediation efforts. Site Description CSQ is located in Marble, Colorado between 9,100 — 9,700 feet in a sub-alpine environment. The DRMS permit boundary and mine access gate is 3.1 miles south along County Road 3c from the bridge over the Crystal River. Drone flight images of the site are included in Appendix A as a spill map and long section maps. Relevant surface mine site locations are labeled on the 2019 drone image long section map. Quarrying operations at the site utilize mechanical cutting techniques —rock and wire saws — rather than drilling and blasting. Similar techniques are utilized both underground in the galleries and outside in the quarries. Finished blocks are hauled on flatbed trucks to the historic mill site for transloading onto highway trucks. Waste marble either is utilized as blocks for erosion protection or is broken to create stable waste rock landforms. Marketable and waste marble blocks are transported throughout the mine site by loaders that are supported by various other heavy equipment such as excavators and smaller loaders. All heavy equipment use the same routes as the SUVs and trucks that transport CSQ staff and operators. Heavy equipment regularly moves between the underground galleries and surface quarries, while only diesel vehicles may access the underground working areas. All moving surface equipment and vehicles are fueled at the main fueling area included in the primary generator pad located at the Franklin Pad. All heavy equipment and vehicle maintenance along with lubricant storage occurs at the maintenance 2