DDW-2024-005994

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

DIEDRE HENDERSON
Lieutenant Governor
Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF DRINKING WATER
Tim Davis
Director

October 3, 2023

Zachery Renstrom
Washington County WCD – Sand Hollow
533 Waterworks Dr
St George, UT 84770

Subject: Notice of Decreased Monitoring for Washington County WCD – Sand Hollow;
UTAH27073

Zachery Renstrom:

According to the Division of Drinking Water’s (the Division) records, Washington County WCD
– Sand Hollow is operating four wells which were previously on a quarterly radionuclide
monitoring schedule. It was requested that the Division evaluate radionuclide levels at the
following four wells to determine if they qualify for reduced monitoring in accordance with R309-
205-7(1)(c): Sand Hollow #18 (identified as WS008 in the Division’s database), Sand Hollow
Well 11 (WS021), Sand Hollow Well 12 (WS022) and Sand Hollow Well 13 (WS023).

Reduced radionuclide monitoring eligibility is determined by taking the running annual average
(RAA) of the combined radium-226 & radium-228 and Gross Alpha Particle Activity levels
gathered through quarterly monitoring. The RAAs are then compared to their respective
maximum contaminant levels (MCLs). The running annual average for each source is presented in
the table below.

Source Combined Radium 226 and Radium 228 RAA1 Gross Alpha Particle
Activity RAA1
WS008 3 3.4
WS021 4 7.3
WS022 5 4.7
WS023 3 3.0
1-units presented in pCi/L
Combined Radium 226 and Radium 228 MCL = 5 pCi/L
Gross Alpha Particle Activity MCL = 15 pCi/L

Zachery Renstrom
Page 2 of 2
October 3, 2023

Based on the data available WS008, WS021, WS022 and WS023 all qualify for reduced monitoring,
and their monitoring schedules have been changed. The monitoring frequency for each source is
different and is specified in the enclosed monitoring schedule. You can also find a current copy of
your complete monitoring schedule at waterlink.utah.gov. Thank you for your efforts in maintaining
a safe drinking water system. Please contact David Kruse at [phone] or [e-mail]
if you have any questions or need assistance.

Sincerely,

Mark Berger
Monitoring and Standards Section Manager

Enclosure: Monitoring Schedule

cc: Zachery Renstrom, Washington County WCD – Sand Hollow, [e-mail]
Brandon Robinson, Washington County WCD – Sand Hollow, [e-mail]
Jeremy Roberts, Southwest Utah Health Department, [e-mail]
Paul Wright, Department of Environmental Quality, [e-mail]
Mark Berger, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]