Water well testing continues near Pavillion

Water well testing continues near Pavillion

Water well testing continues near Pavillion  PAVILLION –The Wyoming Department of Environmental Quality (DEQ) and their consultants, Acton Mikelson Environmental (AME), completed the second round of domestic water well sampling in August.

This summer, DEQ and their consultants were in the Pavillion area sampling thirteen (13) selected wells.

According to Mark Thiesse, DEQ Groundwater Program Manager, the results of the second sampling event should be available to the well owners in late October or early November.

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“As with the first round, the results of the sampling will be reviewed and evaluated by DEQ and our consultants to identify any constituents that might cause health or palatability issues,” said Thiesse.   “The results will be shared with the well owners once the quality assurance and quality control analytical data has been completed.”

The quality assurance and quality control of the first round of sampling data results is nearing completion and will be provided to the well owners in the next few weeks.

Thiesse added that the water well downhole video work is planned for October 2014 and those results will also be shared with the well owners and incorporated into the Final Report.

Pavillion Water Well Background

EPA documents found on line state: In early 2008, the U.S. Environmental Protection Agency (EPA) received complaints from several domestic well owners near the town of Pavillion, Wyoming regarding sustained objectionable taste and odor problems in well water following hydraulic fracturing at nearby gas production wells. In response to these complaints, EPA initiated a comprehensive ground water investigation in September 2008 under authority of the Comprehensive Environmental Response, Compensation, and Liability Act. The area of investigation is a sparsely populated rural area in west-centralWyoming directly east of the town of Pavillion. Land use by residents consists primarily of ranching (horse and cattle) and alfalfa hay production for use by ranchers and commercial sale. Fields are periodically flooded using water obtained from canals and laterals.

Domestic wells in the area of investigation overlie the Pavillion gas field which is one of several gas fields within the Wind River Basin – a large, complex, structural, asymmetric, deep sedimentary basin covering much of central Wyoming (Figure 1). Oil and gas exploration wells were drilled in the 1950s.
Commercial natural gas extraction in the field commenced in 1960 (Single 1969) with gas production well installation activity intensifying in the late 1990s
through 2006. The field currently consists of approximately 169 vertical production wells. Ninety-seven production wells are designated as
“Tribal Pavillion” and are regulated by the U.S. Bureau of Land Management (BLM). The remaining wells are designated as “Pavillion Fee” and are regulated byWyoming Oil and Gas Conservation Commission (WOGCC).


A review of production well records indicates that hydraulic fracturing in gas production wells occurred as shallow as 372m (1220 ft) below ground surface (bgs) with associated surface casing in production wells as shallow as 110 m (361 ft) bgs. Information obtained from the Wyoming State Engineer’s Office and homeowners indicates that domestic wells (including stock wells) in the area of investigation are screened as deep as 244 m (800 ft) bgs. With the exception of two production wells, surface casings of gas production wells do not extend below the maximum depth of domestic wells in the area of investigation.