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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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 40. PROJECT:Gillette Fort Union Well Field
SPONSOR:City of Gillette
LOCATION:Campbell County
Purpose Chapter Session Account Appropriation Due Date
Level III 206 1995 II $550,000* 1999
Level III 59 1996 II $925,000* 1999
Level III 38 1998 II $250,000* 2002
*50% grant

The city of Gillette has experienced considerable draw down and reduced production in their "intown" wells which tap the Fort Union and Lance/Fox Hills aquifers. In addition, the city has made major expenditures in rehabilitating wells and replacing pumps. The Gillette Area Master Plan identified the importance of improved management of the multi source Gillette water supply system in order to reduce operation and maintenance costs, maximize production from existing sources, protect the long term yield of the Fort Union formation, and insure uniformity of water quality to Gillette water users through blending of supply sources.

The 1994 project activities included pump testing and logging of existing wells, analysis of the operation and maintenance procedures for both the in-town wells and the Madison well field, and a review of overall system configuration. The 1994 study established a schedule for rehabilitating Gillette's existing Fort Union well field, for developing maximum production from the Madison well field (included as a Level III recommendation in the 1995 New Development Program), and eventually for a new Fort Union well field.

In 1995, the design for the replacement of two wells was completed and an existing well was rehabilitated. In 1996 two wells were drilled and the design of a supply pipeline was initiated. In 1997 two additional wells were replaced and the supply pipeline was designed. In 1998 the final three wells were completed and construction of the supply pipeline was completed.

No legislative action required.

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