Ashley Valley Water Reclamation            
                                                       
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Background

HISTORY AND BACKGROUND

The Ashley Valley Sewer Management Board began operating a 5-cell facultative lagoon system with an area of 250 acres. After the facility began operating, seeps began to form on the bluff below the lagoon. The intercepted portion of the seepage traveled along the Mancos Shale layer and day lighted out the side slopes of the bluffs and eventually into Ashley Creek. As the seepage flowed to Ashley Creek, it picked up selenium (Se) as well as other naturally occurring minerals and transported them to the creek elevating the TDS and Se levels. When the lagoon system was built it was neither known nor anticipated that seepage from the lagoons would result in the elevated levels of Se in the creek.

On September 30, 1996 the Ashley Valley Sewer Management Board was issued a Notice of Violation for water quality violations. The discharges from the lagoon system contributed to Ashley Creek’s exceeding the numeric water quality criterion for Se. this affected the water quality of Ashley Creek and ultimately the wildlife that lived there.

On June 23, 1997 the Ashley Valley Sewer Management Board was issued a Stipulation and Consent Order by the Utah Division of Water Quality. The Consent Order established a time line for the Ashley Valley Sewer Management Board to correct the water quality issues posed by the lagoon system. The Sewer Management Board decided on building a new mechanical treatment plant. The treatment process would be an extended aeration oxidation ditch with ultra-violet light for final disinfection. The new facility would use state of the art technology. The facility is computer monitored with alarm call out capabilities.

CH2M Hill engineering of Salt Lake City, Utah was hired as the lead engineering firm. Ch2M Hill teamed with Bowen Collins and Associates of Draper, Utah for the design of the new 4.7 MGD treatment facility. Alder Construction Company of Salt Lake City constructed the new facility and the plant went into operation on April 23, 2001. The new treatment facility was designed for expected growth in the area and at the start up was only utilizing 50% of the plant capabilities.

The Ashley Valley Water Reclamation Facility will discharge into the Ashley Creek and was designed to achieve water quality standards required for the protection of the environmentally sensitive water habitat. The oxidation ditch process was selected as a result of its cost effectiveness and ability to provide a high quality effluent. Disinfection of the wastewater is accomplished through ultra-violet light, thus eliminating the need for chlorine, which could have a detrimental impact on the endangered species in Ashley Creek and the Green River.

 

SPECIAL THANKS TO:

The Ashley Valley Sewer Management Board would like to thank the following individuals and agencies for helping in the funding, design, construction and start-up of the Ashley Valley Water Reclamation Facility:

  • Senator Bob Bennett of Utah
  • Don Ostler, Director of the Utah Division of Water Quality
  • Lee Baxter, Bureau of Reclamation
  • Mohammad Razzazian, Project Manager – USEPA Region VIII
  • Michael Mickelson, Project Manager – CH2M Hill Engineering
  • Farris Baggett, Construction Manager  - CH2M Hill Engineering
  • Larry Bowen, Bowen Collins & Assoc. Engineering
  • Bill Herotis, Alder Construction Company of Salt Lake City, Utah

 

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