DDW-2025-003941

April 25, 2025
Annalee Munsey
Metropolitan Water District
3430 Danish Road
Cottonwood Heights, Utah 84093
Subject:New Source Approval, Strawberry Reservoir Diversion (WS005) for Little Cottonwood LCWTP (TP002) and Point of the Mountain POMWTP (TP003), System #18016, File #20963
Dear Annalee Munsey:On July 25, 2024, the Division of Drinking Water (the Division) received a request to review source data as part of a potential new source to be treated by the following
surface water treatment plants:Don A. Christiansen Regional Water Treatment Plant (DACRWTP) (TP001) for Central Utah Water Conservancy District-Utah Valley (System #25112). Little Cottonwood
LCWTP (TP002) and Point of the Mountain WTP (POMWTP, TP003) for Metropolitan Water District of Salt Lake (System #18016).Jordan Valley WTP (JVWTP) (TP002) for Jordan Valley Water Conservancy
District (WCD) (System #18027)The potential new source is identified as the Strawberry Reservoir Diversion. It is identified as WS005 in the Division’s database for Metro Water District.

The Division received the following information for the project:
Map showing source flow to the LCWTP (TP002) & POMWTP (TP003).
Strawberry Reservoir new source chemistry data and historical water quality data.
Initial Evaluation of Strawberry Reservoir Technical Memorandum.
Water Rights confirmation.
Baseline LSI data from LCWTP and POMWTP finished water and distribution system.
Infrastructure timeline.
Our understanding of the project is that a new surface water source from the Strawberry Reservoir is being proposed, which is conveyed through the existing infrastructure of the Utah
Lake System (ULS) pipeline to the Alpine Aqueduct system and/or Provo River system. The project is designed to enhance the efficient use of limited water resources while strengthening
the overall resilience of the water supply system. Operational constraints will prevent Strawberry Reservoir water from being the sole source of water to the LCWWTP (TP002) Point of
the Mountain WTP (TP003). Blending ratios of 5-10 percent of total flow are anticipated.
The district anticipates that it can treat ULS CUP water at LCWTP and POMWTP. ULS CUP water quality is similar to the Deer Creek source at LCWTP and the Provo River source at POMWTP.
Higher TOC levels in ULS CUP water may require higher coagulant doses in order to meet removal requirements and DBP goals. Jar testing suggests that treatment of ULS CUP will be successful
at multiple blends with current source waters. Finished water quality when treating ULS CUP is not expected to be significantly different from current finished water quality. ULS CUP
water may slightly improve corrosiveness due to the chloride to sulfate mass ratio. Notification from CUWCD when ULS CUP is being conveyed to the system will be important so that any
needed adjustments to treatment processes can be made.
We have completed our review of the submittaland hereby approve the Strawberry Reservoir Diversion (WS005) to be treated by Little Cottonwood WTP (TP002) and Point of the Mountain
WTP (TP003) with the following conditions:
You must notify the Division when you first begin to use the new source.
You must submit seven days of operational data included in the monthly Surface Water Treatment Rule report.
You must submit new source chemistry data for the treated finished water source.
You must fulfill and comply with all of the conditions of approvalor this approval is invalid.
Monitoring RequirementFor one year, submit a monthly report stating whether the Strawberry Reservoir was introduced that month. If it was, then provide weekly LSI, chloride, and sulfate
sample data from both the Little Cottonwood LCWTP (TP002) and the POMWTP (TP003).
Facility with new requirements
Analyte(s) Required
# of samples
Sampling Frequency
TP002 & TP003
pH, Alkalinity, Calcium, Conductivity, Temperature
1
Weekly (when Strawberry Reservoir is being treated)
TP002 & TP003
Chloride & Sulfate
1
Weekly (when Strawberry Reservoir is being treated)All LT2 sampling requirements, including two separate rounds of monitoring per R309-215-15, will be completed by CUWCD. If the source
is determined to be in a bin greater than bin 1, additional treatment will be required per R309-215-15.
Drinking Water Source Protection Requirement
R309-605 states that PWSs who jointly submit an acceptable DWSP plan for one surface water source above common point(s) of diversion, will be considered to have met the requirements
of R309-605-7(1)(a). If you have any questions about the Source Protection requirements, please reach out to Melissa Noble, P.G., at [phone] or [e-mail].
If you have any questions regarding this approval, please contact Nagendra Dev, P.E., of this office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
ND/mrn/mdbEnclosures –Operating Permit Checklistcc:Ron Lund, Salt Lake County Health Department, [e-mail] Munsey, Metropolitan Water District, [e-mail]
Sorensen, Metropolitan Water District, [e-mail] Page, Ph.D., Division of Drinking Water, [e-mail] Julie Cobleigh, P.E., Division of Drinking Water, [e-mail]
Martin, P.E., Division of Drinking Water, [e-mail]
Melissa Noble, P.G., Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]

Dylan Martinez, Division of Drinking Water, [e-mail]
Nagendra Dev, P.E., Division of Drinking Water, [e-mail] PA New Source Metro 18016 20963