DDW-2024-012972

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
October 17, 2024

Chance Baxter Bear River WCD 102 W Forest St Brigham City, UT 84302

Dear Mr. Baxter,
Subject: RTCR Level 2 Assessment Bear River WCD – Tremonton Booster Station UTAH02070
Mr. Baxter, thank you for meeting with me on September 24th, 2024, for the Level 2 assessment of
the BRWCD Tremonton Booster Station.
Observations:
This Level 2 Assessment was triggered by multiple TC+/EC- samples in March and June 2024.

The BRWCD Tremonton Booster Station consists entirely of a transmission line which conveys
water from the city of Tremonton to the UKON water system UTAH02014. The line itself is
approximately 6500 feet long with a meter vault at the connection with Tremonton and a meter
vault at the connection with UKON. The actual booster pumps have been removed as system
changes in the Tremonton system eliminated the need for them. There are no service
connections. The meter vaults were dry at the time of the inspection and did not appear to be a
possible cause of the positive samples.

Because this is merely a passthrough system, the water quality is entirely dependent on the
water coming from Tremonton. It was reported that the total coliform positive events coincided
with the failure of the Tremonton chlorinator which feeds this line. Chlorine residual reporting
provided by BRWCD shows incoming chlorine residuals below 0.1 mg/L in January, February,
March and June. Chlorine residuals appear to be more stable in the 3rd quarter. This data does
appear to confirm that the TC+ samples are associated with a lack of chlorine from Tremonton,
and not a water quality issue within the BRWCD transmission line itself.

Chance Baxter Page 2
October 17, 2024

Conclusions:
1. The most likely cause of the unsatisfactory samples appears to be poor source water
quality from Tremonton combined with a disinfection failure which sent untreated water to
the BRWCD UTAH02070 pipeline.
Recommendations:
1. Recommend continuing the practice of testing the chlorine residual before taking a routine bacteriological sample to insure adequate levels of chlorine.
2. Recommend additional chlorine residual testing to determine if another chlorination failure has occurred.
4. Recommend setting up a communication SOP with Tremonton so that notification is made in
the event of a future chlorination failure.
Please contact me at 801-419-6785 or [e-mail], with any questions or if we can be of further assistance.

Sincerely,
Ryan Dearing Field Services Manager 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]