DDW-2024-011539

September 30, 2024
Zachary Root
North Logan City
2525 North 600 East
North Logan, Utah 84341
Subject:Plan Approval, Disinfection Contact Basin, Green Canyon WTP (TP004);
North Logan City, System #03015, File #13650
Dear Zachary Root:The Division of Drinking Water (the Division) received the plans and specifications for the proposed Disinfection Contact Basin in the Green Canyon WTP from your consultant,
Nathan Hall, with Hazen and Sawyer on August 5, 2024. This project has met the conditions for receiving a plan approval.
The Green Canyon WTP was constructed in 1986 to treat 2 MGD. The plant has had minimal upgrades since then and does not provide sufficient contact time for the required disinfection.
The system worked with Hazen and Sawyer in 2022 to develop a solution. It was determined that adding a disinfection contact basin was the best solution.
Our understanding of the project is the addition of a disinfection contact basin to the existing Green Canyon WTP. The basin will hold 454,000 gallons with 5 baffles in a single cell.
The predicted baffle factor is 0.7 with a CT ratio of no less than 1.4. The plant flow design is 2.0 MGD with a maximum summer plant flow of 2.7 MGD. This contact basin addition will
be identified as part of the existing under TP004. A new reporting template will be required for Green Canyon WTP, to be issued with the Operating Permit.
We have completed our review of the plans and specifications, stamped, and signed byPerry Osborn, P.E., dated September 19, 2024,and find they basically comply with the applicable portions
of Utah’s Administrative Rules for Public Drinking Water Systems in R309. On this basis, the plans for Disinfection Contact Basin, Green Canyon WTPare hereby approved.
This approval pertains to construction only. An Operating Permit must be obtained from the Director before Disinfection Contact Basin, Green Canyon WTP may be put in service. A checklist
outlining the items required for operating permit issuance is enclosed for your information.Approvals or permits from the local authority or the county may be necessary before beginning
construction of this project. As the project proceeds, notice of any changes in the approved design, as well as any change affecting the quantity or quality of the delivered water, must
be submitted to the Division. We may also conduct interim and final inspections of this project. Please notify us when actual construction begins so that these inspections can be scheduled.
This approval must be renewed if construction has not begun or if substantial equipment has not been ordered within one year of the date of this letter.
If you have any questions regarding this approval, please contact Cameron Draney, P.E., of this office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
CLD/mrn/mdbEnclosures –Operating Permit Checklistcc:Ben Harker, Bear River Health Department, [e-mail] Hall, Hazen and Sawyer, [e-mail] Osborn, Hazen
and Sawyer, [e-mail] Root, North Logan City, [e-mail] Draney, P.E., Division of Drinking Water, [e-mail] Zebelean, P.E., Division
of Drinking Water, [e-mail] Page, Phd, Division of Drinking Water, [e-mail]
Luke Treutel, Division of Drinking Water, [e-mail] 03015 13650 PA Green Canyon CT Basin
Utah Division of Drinking Water ― Checklist for Issuing Operating PermitsWater System Name:System Number: Project Description:File Number:
Items 1 through 8 below must be submitted to the Division and found to be acceptable prior to operating permit issuance (unless a water line project meets the requirements of R309-500-7
and is not required to obtain an Operating Permit).
Distribution lines (not including in-line booster pump stations) requiring Plan Approval may be placed into service prior to submitting all of the following items and receipt of Operating
Permit if the water system has received items 1 and 4 below.☐1.Certification of Rule Conformance by a professional engineer (P.E.) that all conditions of Plan Approval were accomplished,
and if applicable, changes made during construction were in conformance with rules R309-500 through 550☐2.As-built or record drawings incorporating all changes to approved plans and
specifications (unless no changes were made to the previously approved plans during construction)☐3.Confirmation that as-built or record drawings have been received by the water system☐4.Satisfactory
bacteriological samples as evidence of proper disinfection and flushing in accordance with the appropriate ANSI/AWWA standards:
☐ANSI/AWWA C651-14 AWWA Standard for Disinfecting Water MainsTwo consecutive sample sets at least 16 hours apart, none positive (e.g., every 1,200 feet, end-of-line, each branch)☐ANSI/AWWA
C652-11 AWWA Standard for Disinfection of Water-Storage FacilitiesOne or more samples, none positive☐ANSI/AWWA C653-13 AWWA Standard for Disinfection of Water Treatment PlantsTwo consecutive
samples per unit, none positive, no less than 30 minutes apart☐ANSI/AWWA C654-13 AWWA Standard for Disinfection of WellsTwo consecutive samples, none positive, no less than 30 minutes
apart☐5.Water quality data, where appropriate [For example, include raw and finished water data that demonstrate satisfactory performance of the treatment facility; sample should be
taken from a storage tank for residual volatile organic compounds after tank interior re-coating; etc.]☐6.If applicable, all other documentation that may have been required during the
plan review process☐7.If applicable, confirmation that the water system owner has received the O&M manual for the new facility☐8.If applicable, location data of new storage tank, treatment
facility, or source