DDW-2024-009249

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144830 • Salt Lake City, UT 84114-4830
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor
Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF DRINKING WATER
Nathan Lunstad P.E.
Director

July 8, 2024

Josh Crowther
South Duchesne Culinary Water
P.O. Box 1142
Duchesne, Utah 84021

Dear Mr. Crowther,
Subject: RTCR Level 2 Assessment South Duchesne Culinary Water UTAH07067
Thank you for meeting with me on May 13, 2024, to conduct the Level 2 Assessment (L2) of your
water system. Your cooperation in facilitating this assessment is greatly appreciated.
Observations:
This assessment was triggered by two Level 1 assessments within a 12-month period, which
included routine and repeat Total Coliform Positive (TC+) samples collected in September 2023
and February 2024.
South Duchesne Culinary Water is a residential subdivision with 91 service connections. The
system includes a consecutive connection from 07001 for source supply, with 300,000-gallon and
a 30,000-gallon storage tanks, and two pump stations servicing the tanks. The system is gravity-
fed from the tanks and features an 8-inch and 4-inch mainline distribution system with fire
hydrants located throughout.
Conclusions:
1. The TC+ samples are likely due to stagnant water and aging water in both the storage
tanks and the distribution system. The large distribution system, with service connections
separated by long distances, may contribute to this issue.
2. The presence of silt and dirt in the storage tanks could also be a contributing factor.
3. The loss of chlorine residual may be attributed to the system's extensive size, long
distances, and limited water use.

Deficiencies:

No new deficiencies were assigned during this assessment.

Josh Crowther
Page 2
July 8, 2024

Recommendations:
1. Inspect and Clean Storage Tanks Regularly: Perform routine inspections and cleanings
of the storage tanks. Disinfect the tanks following AWWA C651 standards as part of your
operations and maintenance (O&M) procedures.
2. Install Chlorine Booster Station: Install a chlorine booster station at the consecutive
connection to achieve a target free chlorine residual of 0.3 to 0.7 ppm throughout the
distribution system.
3. Implement Unidirectional Flushing Program: Initiate a unidirectional flushing program
on a periodic basis, aiming for a flushing velocity of 2.5 feet per second. For assistance,
contact the Rural Water Association of Utah.
4. Follow Sanitary Sampling Protocol: Ensure proper flushing and disinfection of sampling
sites using a strong chlorine-based solution. This includes applying the solution, allowing
adequate contact time, flushing the site, and then collecting the sample.
For further technical assistance or questions about flushing and sampling procedures, please
contact Terry Smith at the Rural Water Association of Utah at 435-691-0691 or via email at
[e-mail].
For additional questions or if further assistance is required, please contact me at 385-270-7272 or
[e-mail].
For inquiries related to the work performed, please reach out to Field Services Section Manager
Ryan Dearing at 801-419-6785 or via email at [e-mail].

Sincerely,

Brian Pattee
Environmental Scientist
Utah Division of Drinking Water

Enclosures: Assessment Report
cc:
Brian Pattee, Division of Drinking Water, [e-mail]
Sitara Federico, Division of Drinking Water, [e-mail]
Nathan Hall P.E., DEQ District Engineer, [e-mail]
Cindy Austreng, Tri County Health Department, [e-mail]

Josh Crowther
Page 3
July 8, 2024