DDW-2025-003006

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
Tim Davis Executive Director DIVISION OF DRINKING WATER Nathan Lunstad, Ph.D., P.E. Director
March 18, 2025

Wesley Vanvalkenburg Midvale City Water System 8196 S 700 W Midvale, UT 84047
Subject: Notice of Source Grouping, Change in Sampling Location for Midvale City Water System; UTAH18017

Wesley Vanvalkenburg: This letter serves as notification that due to the configuration of the Hancock Replacement Well (identified as WS008) and the Million Gallon Well (WS001), these two sources qualify for
collective chemical sampling at the outflow of the holding tanks (location identified as TP009
“PCE Blend Site”). The chemical monitoring requirements mandated under R309-205 should now be collected from the PCE Blend Site (TP009), rather than from the individual sources themselves. Chemical samples collected from the PCE Blend Site (TP009) shall be collected at times when both sources are represented.

The Hancock Replacement Well (WS008) contains elevated levels of tetrachloroethylene (PCE). A blending plan to reduce PCE concentrations entering the distribution system was approved by the Division of Drinking Water (the Division) on April 6, 2023. The plan requires quarterly volatile organic compound (VOC) monitoring at both the Hancock Replacement Well (WS008)
and the Million Gallon Well (WS001) so that if PCE concentrations increase, appropriate
operational adjustments can be made. This requirement remains in place. The updated monitoring requirements for Midvale City Water System are given below. An updated monitoring schedule can be viewed any time at waterlink.utah.gov under the water
monitoring section.

Wesley Vanvalkenburg Page 2 of 3
March 18, 2025

Facility with new requirements Analyte(s) Required # of samples Sampling Frequency Next Due Date Rule Reference
TP009 PCE Blend Site Tetrachloroethylene 1 Monthly 03/01/2025-03/31/2025 R309-205-6(2)
Nitrate 1 Yearly 01/01/2025-12/31/2025 R309-205-5(4)(a)
Pesticides 2 Every three years 01/01/2026-12/31/2028 R309-205-6(1)(f)
Radionuclides 1 Every three years 01/01/2026-12/31/2028 R309-205-7(1)(c)
Combined Uranium 1 Every three years 01/01/2026-12/31/2028 R309-205-7(1)(c)
Inorganics & Metals 1 Every three years 01/01/2026-12/31/2028 R309-205-5(3)(a)
Sulfate, Sodium, TDS 1 Every three years 01/01/2026-12/31/2028 R309-205-5(3)(a)
PFAS Collect (1) sample every 2-4 months during a 12 month period for a total of 4 samples by April 26, 2027. 40 CFR 141 (2024)
WS001 Million Gallon Well Volatile Organics 1 Quarterly 04/01/2025-6/30/2025 R309-205-6(2)
WS008 Hancock Replacement Well Volatile Organics 1 Quarterly 04/01/2025-6/30/2025 R309205-6(2)
PFAS Information and Resources The EPA rule for PFAS requires that either method 533 or 537.1 version 2 are used for testing. Please ensure that the chosen laboratory processes PFAS samples using one of these methods.
Additionally, the Division has resources to assist water systems in completing the PFAS initial
monitoring requirements. For more information on the resources the division can provide related to PFAS initial monitoring please visit ddwpfas.utah.gov. For PFAS related questions, please contact John Steffan at [e-mail] or [phone].
Thank you for your efforts in maintaining a clean drinking water system. Please contact David
Kruse at (385)-566-7789 or [e-mail] for questions regarding the source monitoring and reporting requirements for your water system. Sincerely,

Mark Berger
Monitoring and Standards Section Manager

Wesley Vanvalkenburg Page 3 of 3
March 18, 2025
Enclosure: Monitoring Schedule cc: Wesley Vanvalkenburg, Midvale City Water System, [e-mail]
Fuaad Hararah, Salt Lake County Health Department, [e-mail]
Mark Berger, Division of Drinking Water, [e-mail]
John Steffan, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]
[e-mail]