DDW-2025-001652

February 11, 2025
Kasey Dean Carpenter
Salt Lake County Service Area No 3 - Mid-Gad
PO BOX 920067
Snowbird, UT 84092
Subject:Plan Approval, Mid-Gad Chlorinator 2 (TP002), Mid-Gad System Pressure Tank (HD001), and Mid-Gad System Pressure Pumps (PF001); SL County Service Area No. 3 - Mid-Gad, System
#18015, File #15056
Dear Kasey Dean Carpenter:The Division of Drinking Water (the Division) received the plans and specifications for the proposed new Mid-Gad restaurant from you on May 30, 2024. The project
included plans and specifications for:Mid-Gad Restaurant 20K Indoor Tank (ST003)Mid-Gad Chlorinator 2 (TP002)A hydropneumatic system which includes Mid-Gad System Pressure Tank (HD001)
and Mid-Gad System Pressure Pumps (PF001)Written review comments and revised plans were exchanged between June 19, 2024 and January 21, 2025. On December 4, 2024, the Division sent an
After-the-Fact Plan Approval for the Mid-Gad Restaurant 20K Indoor Tank (ST003). This letter addresses the Mid-Gad Chlorinator 2 (TP002), Mid-Gad System Pressure Tank (HD001), and Mid-Gad
System Pressure Pumps (PF001). This project has met the conditions for receiving a plan approval.
The letter includes the following sections and addenda:

Project Summary for Mid-Gad Chlorinator 2 (TP002), Mid-Gad System Pressure Tank (HD001), and Mid-Gad System Pressure Pumps (PF001)    
Plan Approval for Mid-Gad Chlorinator 2 (TP002), Mid-Gad System Pressure Tank (HD001), and Mid-Gad System Pressure Pumps (PF001)
Operating Permit Checklist 
Future Monitoring and Reporting Requirements (Addendum 1)
Estimated Disinfection CT & Summary Table (Attachment 1)
Disinfection CT Calculation Sheet (Attachment 2)Project Summary
Our understanding of the project includes the following facilities:Mid-Gad Chlorinator 2 (TP002)
The chlorinator will dose a sodium hypochlorite solution of 12.5% concentration.
This chlorinator will add chlorine to the water from Mid Gad Spring (WS001).
This chlorinator is intended to provide secondary disinfection in the distribution system.
The chlorinated water will flow to the Mid-Gad Restaurant 20K Indoor Tank (ST003).
The proposed sodium hypochlorite for disinfection meets the ANSI/NSF 60 standard.
The proposed design target dose of 0.3 mg/L or ppm (measured as free chlorine) is based on a typical flow of 1.4 gallons per minute (gpm) from the Mid Gad Spring (WS001).
The chlorine dose will be adjusted by an automatic flow-paced control.
The Point of Entry (POE) sampling location will be on the tank drain line.Hydropneumatic system which includes the Mid-Gad System Pressure Tank (HD001) and Mid-Gad System Pressure Pumps
(PF001)The Mid-Gad Restaurant 20K Indoor Tank (ST003) is located on the lower level of the Mid-Gad Restaurant and uses a hydropneumatic system to pressurize flow to the distribution
system.The hydropneumatic system consists of a 53-gallon pressure tank and Grundfos Hydro MPC-2020 pumps which pressurizes flow to the distribution system.
Plan Approval for Mid-Gad Chlorinator 2 (TP002), Mid-Gad System Pressure Tank (HD001), and Mid-Gad System Pressure Pumps (PF001)
We have completed our review of the plans and specifications, stamped, and signed byPaul Feser, P.E., dated December 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 Mid-Gad New Building are hereby approved.
This approval pertains to construction only. An Operating Permit must be obtained from the Director before Mid-Gad New Building 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, a 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.
Secondary Disinfection Requirements
SL County Service Area No 3 - Mid-Gadis not required to disinfect the Mid Gad Spring (WS001) based on bacteriological source sample results currently available. The water system is electing
to install the Mid-Gad Chlorinator 2 (TP002) to provide a detectable disinfectant residual in the distribution system for secondary disinfection.
The plan review of the proposed Mid-Gad Chlorinator 2 (TP002) is based on providing secondary disinfection. When this chlorinator is installed and placed in operation after the Operating
Permit issuance, SL County Service Area No 3 - Mid-Gad will be required to demonstrate ongoing compliance with the secondary disinfection requirements that are outlined in Addendum 1
to this letter.
The Division shall be informed by telephone within 8 hours by a water supplier ofthe malfunction of any disinfection facility such that a detectable residual cannot be maintained at
all points in the distribution system per R309-105-18(1)(a).
Please be aware if the Mid Gad Spring (WS001) is found to requireadditionaldisinfection in the future per R309-200-5(7)(a)(i), further regulations will apply. For example, if primary
disinfection is required this will include submitting disinfection CT information showing compliance with 4-log virus inactivation in accordance with the Ground Water Rule in R309-215-16.
If you have any questions regarding this approval, please contact Rebecca Yoo, P.E., of this office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
RY/mrn/klmEnclosures –Operating Permit ChecklistAddendum 1 - Future Elective Monitoring and Reporting Requirementscc:Matthias Neville, Salt Lake County Health Department, [e-mail]
Hararah, Salt Lake County Health Department, [e-mail] Foser, Spinnaker-Land LLC, [e-mail] Dean Carpenter, Salt Lake County Service Area No 3 - Mid-Gad,
[e-mail], [e-mail] Shafer, Snowbird Resort LLC, [e-mail] Yoo, P.E., Division of Drinking Water, [e-mail]
Luke Treutel, Division of Drinking Water, [e-mail] (disinfection & DBP)
Sitara Federico, Division of Drinking Water, [e-mail] (if involving RTCR/bact. sampling)PA - Basic & GW Secondary Disinfection 20200407[Right click. Select “Update Field” to
update file name]
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
Addendum 1
Future Elective Monitoring and Reporting Requirements
Chlorine Monitoring & Reporting Requirements
The water system will be required to meet elective disinfection requirements once this facility is installed and operating. As a part of these requirements, the water system will need
to continuously maintain a minimum free chlorine residual at each chlorinator Point of Entry (POE) into the system and demonstrate a detectable chlorine residual in the distribution
system.
Elective Disinfection Requirements and Reporting
Chlorine Residual ‒ Point of Entry (POE) to Distribution System
The POE sampling location will be identified in the Division’s database. The location will be identified during the operating permit process. Maintain a minimum of 0.2 mg/L residual
(measured as free chlorine) at the POE sampling location. [R309-215-16(3)(b)(iii)(A)(I) and (II)]
The chlorine residual concentration measured at the POE sampling location shall not exceed the maximum residual disinfectant level (MRDL) of 4.0 mg/L (measured as free chlorine). [R309-200-5(3)(c)(iv)]Record
and report the lowest daily value of chlorine residual measured as free chlorine at the POE sampling location (EP002). [R309-215-10(1)]Our records show that your water system serves
400 people. Please be aware that R309-215-16(3)(b)(iii)(A)(II) requires water systems serving 3,300 people or fewer to monitor the POE chlorine residuals and take daily grab sample(s).
Alternatively, instead of taking daily grab samples, a groundwater system serving 3,300 or fewer people may choose to use an online analyzer to continuously monitor the POE chlorine
residuals entering the distribution system.
Chlorine Residual ‒ Distribution System (DS001)
This water system must maintain a detectable residualthroughout the distribution system. It is recommended to maintain the chlorine residual above 0.1 ppm in the distribution system.
[R309-520-5]
The chlorine residual measured in the distribution system shall not exceed the maximum residual disinfectant level (MRDL) of 4.0 mg/L (measured as free chlorine). [R309-200-5(3)(c)(iv)]
This water system must take a minimum of three (3) chlorine residual samples per weekat varying locations throughout its distribution system (DS001). [R309-105-10(1)(c)]
Distribution system chlorine residuals must be taken in conjunction with total coliform sampling. [R309-215-10(3)]
Disinfection Report Submission
To demonstrate ongoing compliance with elective disinfection requirements, the water system must complete monthly operational reports for each active chlorinator using a template approved
by the Division.
Operational reports are submitted quarterly. The reports are due to the Division by the 10th day following the end of each reporting month or quarter (i.e., January 10th, April 10th,
July 10th and October 10th for quarterly reports). The reports can be submitted by hardcopy, fax, or email at [e-mail]. Please contact Luke Treutel at [phone] or [e-mail]
to schedule training regarding proper reporting.
In addition to monthly disinfection reporting, this water system must submit the monthly average of chlorine residual samples taken in the distribution system. Distribution system chlorine
residual monitoring results are due quarterly by the same compliance dates as the monthly disinfection report and can be submitted via an online form found at mrdl.utah.gov.
Records must be maintained for a minimum of 5 years. [R309-105-17(1)]
Source Bacteriological Monitoring
Please continue to sample assessment monitoring at Mid Gad Spring (WS001) each month prior to chlorination as stated in the increase monitoring letter sent in September 2024. The source
assessment monitoring results will be used to determine if the water system will be required to disinfect, as well as the level of disinfection required. The system may be subject to
additional treatment if future water quality sampling results indicate any of the system's sources require primary disinfection.