DDW-2025-000518

January 21, 2025
Robert Thomas
Wolf Creek Water and Sewer ID
P. O. Box 658
Eden, Utah 84310Subject:Safe Yield Evaluation, Warm Spring Artesian Well (WS002) and East Well (WS006);Wolf Creek Water and Sewer ID, System #29013, File #18488
This is not Plan Approval for construction.Dear Robert Thomas:The Division of Drinking Water (the Division) received a copy of the Drilling, Construction & Aquifer Testing, for the Eden
Crossing Well 5, withEmphasis on Potential Interference with Surrounding Sources on August 5, 2024summarizing the aquifer test of the Eden Crossing (UTAH29132) Well #5 (UTAH29132 WS005)
and its impacts on the Warm Spring Artesian Well (WS002). The Division then received a request from Shane Dunleavy onNovember 19, 2024 requesting clarification on the safe yield of Wolf
Creek Water and Sewer ID’s (the System) East Well (WS006) and other drinking water sources. A safe yield memorandum was sent from the Division dated June 1, 2022 for the East Well. A
mitigation agreement for the well was entered into on October 19, 2022 which impacts the maximum flow rate the System can pump the East Well (WS006). This letter serves to clarify the
safe yield of the Warm Spring Artesian Well (WS002) and the East Well (WS006).Based on updated metering data and mitigation agreements the Division concludes that the safe yield of the
Warm Spring Artesian Well (WS002) is 128 gpm and the East Well (WS006) is 150 gpm. Once the East Well is granted an operating permit the System’s source capacity will total 278 gpm.
The total of the System’s source capacity is the basis for determining the maximum number of connections that the System can serve.Warm Spring Artesian Well (WS002)This water source
is currently the only active drinking water source for the System. The Division does not have documentation on when the water source was constructed but it is assumed it was most likely
constructed prior to 1993. The Division updated the safe yield of the Warm Spring Artesian Well (WS002) from 400 gallons per minute (gpm) to 193 gpm as summarized in a letter sent to
the Division from Miranda Menzies received on June 30, 2020. Not included in the letter is the documentation of the mitigation agreement with the Wolf Creek Irrigation Company (WCIC)
where 0.8 cubic feet per second (cfs) (358.4 gpm) should be put into their system from the Warm Spring Artesian Well (WS002) and the Warm Spring springs (not a drinking water source)
during the irrigation season. The letter did outline the System owns 182.16 of the 791 shares of WCIC. As of the date of this letter, the System owns 237 of the 791 shares of WCIC. The
Warm Spring Springs is credited with a flow of 70 gpm, also corroborated by the Eden Crossing Report. Taking into account the flow of 400 gpm of the Warm Spring Artesian Well (WS002),
70 gpm of the Warm Spring springs, and the System’s shares in the irrigation company, resulted in the adjusted 193 gpm safe yield in 2020. During the construction and testing of the
Eden Crossing Well #5 (UTAH29132 WS005) a flow meter was installed on the discharge piping of the Warm Spring Artesian Well (WS002) to watch the flows during the aquifer testing. As
a result of the aquifer testing, the report dated August 2024 concluded that the base artisanal flow of the Warm Spring Artesian Well (WS002) is closer to 310 gpm than the 400 gpm used
prior. Using the same logic as before to calculate the safe yield of the Warm Springs Artesian Well (WS002):Safe Yield = 128 gpmEast Well (WS006)The East Well (WS006) is currently listed
as a proposed water source on the System’s inventory. Plan Approval for drilling the East Well (WS006) was issued on January 26, 2022. Plan Approval for Equipping was issued on February
16, 2023, and was renewed on February 26, 2024. The Division’s current understanding of this project is the System is waiting for power before being able to perform start-up operations
and request an Operating Permit. A constant rate test was received on May 26, 2022, with a request to set the safe yield for the East Well (WS006). The safe yield letter dated June 1,
2022, concluded the well would be credited with 284 gpm. Further, a mitigation agreement dated October 19, 2022, between the System and Eden Water Works states that the system may pump
up to a maximum of 150 gpm. Therefore, the safe yield for the East Well will be revised to 150 gpm. This will be reflected in the System’s available source capacity once the operating
permit for the East Well is granted.
If you have any questions regarding this letter, you can contact Dani Zebelean, P.E., of this office, at [phone], Michael Newberry, P.E., Permitting and Engineering Manager, at
[phone].
Sincerely,
Nathan Lunstad, Ph.D., P.E.
DirectorDZ/mrn/mdbcc:Scott Braeden, Weber-Morgan Health Department, [e-mail] Thomas, Wolf Creek Water and Sewer ID, [e-mail] Lunstad, Ph.D, P.E.,Division
of Drinking Water, [e-mail] Seeley, P.E.,Division of Drinking Water, [e-mail] Newberry, P.E., Division of Drinking Water, [e-mail] Zebelean,
P.E., Division of Drinking Water, [e-mail] Draney, P.E., Division of Drinking Water, [e-mail] Payne, Division of Drinking Water, [e-mail]
DZebelean 29013 18488 System Safe Yield Evaluation