DWQ-2024-008968

December 23, 2024

To:

Daniel Griffin
Utah Division of Water Quality
195 N 1950 W, SLC, UT 84116
[phone]

Subject:

Nebo Power Plant Annual Report on TDS

Dear Daniel,

This letter is the annual report required in the Nebo Power Plant discharge permit
UT0025518. Each year UAMPS is required in the permit to submit a report on its
progress towards the final TDS limit in the permit that is required to be met by January
1, 2028. The ”Interim Limits” the Nebo Power Plant is currently required to meet is
higher than the final limit for the permit due to receiving tertiary water from the Payson
Wastewater Treatment Plant (Payson WWTP). The Payson WWTP is currently
undergoing upgrades / construction in efforts to meet new requirements set forth by
the state of Utah. While Payson Wastewater Treatment Plant is undergoing upgrades /
construction,. the facility has swings and unreliable discharge levels that will affect
Nebo Power Plant’s discharge directly. In efforts for meeting TDS discharge limits, the
Nebo Power Plant is limiting its cycles / turns in the cooling systems that the plant uses
from the wastewater treatment plant, which results in lower concentration of TDS and
other discharge items. Also, the Nebo Power Plant continues to monitor incoming
water from the wastewater facility adjusting blowdown rates and using the city’s
culinary water system to help supplement during extreme upset conditions.

Data:

November 1 – December 12, 2024

TDS Daily Max: 2770

TDS Average: 2020

Sincerely,

Eric Hutchinson
Compliance Specialist
[e-mail]
[phone]