Exhibit F Environmental Monitoring Locations Figure.pdf

Exhibit F is an environmental monitoring site layout document for the Captain Jack Superfund Site located in Ward, Colorado, prepared for the State of Colorado on behalf of Denver County and Denver City. The document provides a comprehensive site map identifying 21 distinct monitoring locations including four groundwater monitoring wells (MW1-MW4), 11 surface water sampling stations (SW-01 through SW-11), and 21 seeps distributed across the site with specified latitude and longitude coordinates. The figure illustrates the locations of historical mine workings, including the Big 5 Tunnel, Dew Drop Mine, and Niwot Crosscut, as well as two archaeological sites (Switzerland Trail and Camp Francis). Additional features mapped include borehole and electrical resistivity tomography (ERT) array locations, a water quality monitoring system, access roads, and the extent of seep surveys across the 8,944 to 9,144-foot elevation range. The site layout incorporates a note prohibiting vehicular traffic within the Camp Francis Archaeological Site except in emergency situations.

The monitoring locations and site infrastructure depicted in this exhibit directly support the operations and maintenance contract for the Captain Jack Mill Superfund Site, which runs from May 1, 2026, through April 30, 2027. The contract, solicited on April 30, 2026, with proposals due May 13, 2026, requires contractor implementation of 12-month sampling activities, operation of permanent and temporary water treatment systems, site-wide maintenance, and technical support across all identified monitoring locations. Contractors must provide labor across 13 specified position categories at firm hourly rates with material costs reimbursed based on documented actual purchases under a hybrid fixed-price and cost-reimbursable structure. All contractors must comply with federal provisions including Davis-Bacon Act prevailing wage requirements, Byrd Anti-Lobbying Amendment certifications for contracts exceeding $100,000, and Clean Air Act and Federal Water Pollution Control Act compliance for contracts exceeding $150,000.