DDW-2024-006035

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
Tim Davis
Director

November 21, 2023

John O’Brien
Summit County Service Area #3
629 Parkway Dr
Park City, UT 84098

Subject: Notice of Increased Monitoring for Summit County Service Area #3, UTAH22105

John O’Brien:

According to the Division of Drinking Water’s (the Division) records, the District Well (listed as
WS001 in the Divisions database) detected Gross Alpha Particle Activity at levels of 25 pCi/L on
August 18, 2023. The Maximum Contaminant Level (MCL) for this contaminant is 15 pCi/L. As a
result of this, this source is now subject to increased monitoring in accordance with R309-205-
7(c)(v). Compliance with the Gross Alpha Particle Activity MCL will be determined by the
Running Annual Average (RAA) of the samples collected at the District Well (WS001). If at any
point the RAA is greater than 15 pCi/L, a MCL violation will be issued, and public notice will be
required.

The District Well (WS001) is now required to be sampled each calendar quarter that the facility is running
for Radium 226, Radium-228, Gross Alpha Particle Activity, and Combined Uranium. Presented below are
the complete monitoring requirements for this facility.

Facility with new
requirements
Analyte(s)
Required
# Of
samples
Sampling
Frequency Next Due Date Rule
Reference
WS001
District Well
Combined
Uranium 1 Quarterly 01/01/2024-
03/31/2024 R309-205-7

Gross Alpha
Particle
Activity
1 Quarterly 01/01/2024-
03/31/2024 R309-205-7
Radium-226 1 Quarterly 01/01/2024-
03/31/2024 R309-205-7
Radium-228 1 Quarterly 01/01/2024-
03/31/2024 R309-205-7
John O’Brien
Page 2 of 2
November 21, 2023
Nitrate 1 Yearly 01/01/2024-
12/31/2024 R309-205-5
Pesticides 1 Every Three
Years
01/01/2026-
12/31/2028 R309-205-6(1)
Sulfate,
Sodium, TDS 1 Every Nine
Years
01/01/2029-
12/31/2037 R309-205-5
Volatile
Organics 1 Every Six
Years
01/01/2026-
12/31/2031 R309-205-6(2)
Inorganics and
Metals 1 Every Nine
Years
01/01/2029-
12/31/2037 R309-205-5
You will find a current copy of your complete monitoring schedule enclosed and online at
waterlink.utah.gov by selecting your system and then selecting Water Monitoring under Water
System Reports. Thank you for your efforts in maintaining a safe drinking water system. If you
have questions concerning your sampling requirements, please contact David Kruse at 385-566-
7789 ([e-mail]).
Sincerely,
Mark Berger
Monitoring and Standards Implementation Manager
Enclosure – Monitoring Schedule
cc: John O’Brien, Summit County Service Area #3, [e-mail]
Nathan Brooks, Summit County Health Department, [e-mail]
Mark Berger, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]