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Wyoming Water Development Commission 
Harry C. LaBonde, Jr., PE, Director 
6920 Yellowtail Rd, Cheyenne, WY 82002 
Phone: 307-777-7626 

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 25. PROJECT:Douglas Master Plan
LEVEL:New Application
SPONSOR:City of Douglas
LOCATION:Converse County
PROGRAM:New Development

The project is a Water System Master Plan for the City of Douglas and the adjacent areas served by the City of Douglas. There are currently 2,275 taps within the corporate limits of the City of Douglas and approximately 75 outside the city limits. A population of 5,800 is served. These areas include users along the Little Box Elder Spring transmission line, Sheep Mountain Well transmission line, and the Ridgewater Estates Improvement and Service District. The city currently has three sources of potable water: 1) the Little Box Elder Spring, 2) the Water Treatment Plant located along the North Platte River, and 3) the Sheep Mountain Well. The Master Plan would evaluate the existing transmission and distribution system and examine the ability of the sources in the system to meet the current demands and future demands in the anticipated areas of growth in Douglas. Hydraulic modeling would isolate the cause for low water pressure problems in two areas of the city, Riverbend Subdivision and Frontier Village. Potential system modifications would be considered to meet current and projected growth areas which are experiencing inadequate system pressures. Preliminary designs would be evaluated to determine potential solutions and costs for remedying transmission, distribution and zoning problems.

In addition to the hydraulic modeling and transmission and distribution system evaluation, treatment of the potable water sources would be evaluated. The water treatment plant was constructed in the early 1980's. Treatment and disinfection requirements have become more strict since that time by amendments to the Safe Drinking Water Act. Specifically in question is the chlorine contact time (CT) and chlorine residual at the water treatment plant. Additionally, the Disinfection Rule will require the city to meet CT requirements for the Sheep Mountain Well and the Little Box Elder Spring. There are currently over 30 domestic taps ahead of the point of chlorination on the Spring Transmission Line. Access to the spring is limited and will need to be improved if the point of chlorination is moved to the spring house.

The City of Douglas has experienced steady growth since the late 1980's. Additional potable water sources have been added to meet the increasing demands in the system. However, the entire transmission, distribution and storage system has not been evaluated or updated.

The City of Douglas' water transmission and distribution system contains cast iron pipelines which were constructed in the 1940's. These portions of the system are undersized and maintenance intensive. Portions of the distribution system do not meet the requirements for minimum operating pressure as required by the Wyoming Department of Environmental Quality. This poses a potential health risk in terms of cross connections and the potentially disastrous effects of restricted fire flows.

The water treatment plant and the Sheep Mountain well have been added to the system over the years. As they were added to the system, the impacts of each source on the entire system was never thoroughly evaluated. Currently there are several hydraulic limitations and "bottlenecks" in the transmission and distribution system caused by the three sources competing to supply the demands. All of the sources enter the system along the northwest edge of the city; consequently, the tank on this side of town is always full while the tank serving the greater area on the east side of the city is commonly less than half full.

The water treatment plant would not currently meet the EPA disinfection requirements if it was operated at full capacity. Additionally, a thorough evaluation of the treatment train and techniques needs to be performed to verify compliance with all of the rules and regulations in the Safe Drinking Water Act amendments.

The WWDC recommends the project be incorporated into the New Development Program as a Level I project with an appropriation of $100,000.

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