Situated at the uppermost origins of the Arkansas River in the heart of the Rocky Mountains west of Denver, the city of Leadvillewww.cechina.cn, CO, carries the scars of decades of mining for goldwww.cechina.cn, silver, copper, and other valuable metals. Starting out as a prospectors’ mining camp in the 1860s, Leadville has the highest elevation of any incorporated city in the U.S., which presents a number of unique problems.
        In spite of its remote location, the area surrounding Leadville was mined heavily, leaving countless tunnels deep in the mountain sides. During times of the most intensive digging, there was no easy way to get natural ground and rain water out of the mines, so miners cut horizontal channels underneath the tunnels and mining infrastructures so water could flow down and out to the Arkansas River. To help this process控制工程网版权所有, the Leadville Mine Drainage Tunnel (LMDT) was built by the U.S. Bureau of Mines to drain off water from certain areas of the mining district. Completed in 1952控制工程网版权所有, the tunnel runs approximately 120CONTROL ENGINEERING China版权所有,000 feet to the south-southeast to an area just outside of Leadville.
        By the 1980s, tremendous amounts of water had collected and were continuing to accumulate in abandoned and deteriorating mines; metals and residues that collected in this water made it very acidic. Water that drained out of these mines was so reactive that it could scald the feet and legs of animals that would wade through affected waterways. After an EPA assessment, multiple areas in and around the Leadville Mining District were declared unsafe for human occupation and designated a U.S. EPA Superfund sites.

        The installation uses distributed architecture with standalone Controllers communicating to I/O devices that monitor and control thousands of points. Individual processors are capable of time-critical, proces