Exhibit F Environmental Monitoring Locations Figure.pdf

This file is an environmental monitoring locations figure for the Captain Jack Superfund Site located in Ward, Colorado. The site layout map illustrates the spatial distribution of monitoring infrastructure and historical mining features across the facility. Key monitoring elements depicted include monitoring well and borehole locations, a water quality monitoring system, surface water sampling locations, and a shallow electrical resistivity tomography (ERT) array. The map also identifies historical mining features such as the Dew Drop Mine workings, Big 5 Tunnel (both surveyed and assumed locations), Niwot Crosscut, and original seep locations, as well as new seep locations that developed following valve closure. Two archaeological sites are marked on the map: the Switzerland Trail Archaeological Site and the Camp Francis Archaeological Site, with a note restricting vehicular traffic within the Camp Francis site except in emergencies. The extent of seep surveys is indicated to span elevations between 8,944 and 9,144 feet, and access roads are delineated throughout the site. An ERT array location attributed to Walsh is shown, along with a borehole-ERT array location for subsurface characterization.

This figure serves as a reference document for the Operations and Maintenance (O&M) activities at the Captain Jack Mill Superfund Site, providing contractors with a comprehensive visual representation of monitoring locations, infrastructure placement, and site constraints necessary for executing ongoing environmental remediation and monitoring protocols at the facility.