DDW-2024-005988

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
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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

September 12, 2023
Clint Mcaffee
Park City Water System
P.O. Box 1480
Park City, Utah 84060

Subject: REVISED UTAH22011 Divide Well (WS010) TDS Blend

Dear Clint Mcaffee:

In response to the May 31st submitted blending plan, the Permitting Section determined that
this source has already been approved for blending, and an Operating Permit is not needed
(see Division File# 10586).

As mentioned in the proposal, the Divide Well (WS010) sample results have exceeded
1,000 mg/L. Per R309-200-5 Primary Drinking Water Standards, Table 200-1 Primary
Inorganic Contaminants, Total Dissolved Solids (TDS) Note 3 states:

If TDS is greater than 1000 mg/L, the supplier shall satisfactorily demonstrate to the
Director that no better water is available. The Director shall not allow the use of an
inferior source of water if a better source of water (i.e. lower in TDS) is available.

A better source is available through source blending involving Park Meadows Well (TP004)
water at the Creekside WTP and 3 Kings WTP (TP015). Please note, the submitted TDS
Blending Plan is subject to the following conditions and monitoring schedule changes:

1. Compliance with the Total Dissolved Solids (TDS) standard will be based on TDS
sample results at the Boothill Tank TDS Blend (TP016) sampling point. The selected
location of TP016 is at the pipeline prior to the Boothill Tank, located in the Boothill
Vault. The intent of this sampling is to determine the quality of the water delivered to the
consumers within the distribution system. If at any time the running annual average of the
System’s TDS levels exceeds the TDS MCL of 2,000 mg/L (ppm), the Park City water
system will be issued a water quality violation in accordance with Utah Administrative
Code R309-205-5(1).

Clint Mcaffee
Page 2 of 2
September 12, 2023

a. The Water System must take source TDS samples at the Divide Well
(WS010) (e.g., the well head) on an annual basis. The annual sample should be
collected in the second quarter when TDS levels have historically been the
highest.

b. The System must take a TDS blend compliance sample at the Boothill Tank
TDS Blend (TP016) sampling point, at the pipeline prior to the Boothill Tank,
annually. The annual sample should be collected during the second quarter of
the year when TDS levels are highest at the Divide Well.

For any questions regarding TDS monitoring and reporting, please contact David Kruse
at [phone] or [e-mail].

Sincerely,

Mark Berger
Monitoring and Standards Section Manager

Enclosures: Monitoring Schedule

cc: Clint Mcaffee, Park City Water System, [e-mail]
Michelle DeHaan, Park City Water System, [e-mail]
Nathan Brooks, Summit County Health Department, [e-mail]
Julie Cobleigh, Division of Drinking Water, [e-mail]
Mark Berger, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]