Exhibit F Environmental Monitoring Locations Figure.pdf

This is an environmental monitoring site layout figure for the Captain Jack Superfund Site located in Ward, Colorado. The document, dated November 12, 2020, provides a comprehensive map depicting the spatial distribution of environmental monitoring locations and historical mining features across the site. The figure illustrates the locations of monitoring wells and boreholes, water quality monitoring systems, and surface water sampling points. The map also identifies historical mine workings, including the Dew Drop Mine, Big 5 Tunnel (both surveyed and assumed locations), and Niwot Crosscut, along with archaeological sites including the Switzerland Trail Archaeological Site and Camp Francis Archaeological Site. The extent of seep surveys is delineated on the map, showing both original seep locations present before valve closure and new seep locations present after valve closure. A shallow electrical resistivity tomography (ERT) array is noted with an approximate location reference to Walsh. Access roads are marked throughout the site, with a noted restriction that no vehicular traffic is permitted within the Camp Francis Archaeological Site except in cases of emergency.

The figure serves as a critical reference document for environmental remediation and monitoring activities at the Superfund site, enabling coordination of environmental sampling, geological investigation, and archaeological preservation efforts. The detailed delineation of monitoring locations and historical features provides the technical foundation necessary for ongoing environmental assessment, groundwater evaluation, and compliance with Superfund remediation requirements.