DDW-2024-006094

February 21, 2024
Hayden Leslie White
Enoch City Water System
900 East Midvalley Road
Enoch, Utah 84720
Subject:Plan Approval, Enoch Water System Chlorinators Project;
Homestead Well Chlorinator (TP001)
Anderson Well Chlorinator (TP002)
Ravine Road Well Chlorinator (TP003)
Iron Works Well Chlorinator (TP004)
Tank Well Chlorinator (TP005)
Norm Grimshaw Well Chlorinator (TP006)
Little Eden Well Chlorinator (TP007)
Enoch City Water System, System #11004, File #13375
Dear Hayden White:The Division of Drinking Water (the Division) received the plans and specifications for the Enoch Water System Chlorinators Project from Khevar Mcleod, Sunrise Engineering
on January 16, 2024. Written review comments were provided to you and your consultant on February 7, 2024. The Division received the revised plans and specifications on February 8,
2024. This project has met the conditions for receiving a plan approval.
The letter includes the following sections and addenda:

1.Project Summary for seven new chlorinators for the Enoch City Water System at each active well (TP001 - TP007)    
2. Plan Approval for seven new chlorinators for the Enoch City Water System at each active well (TP001 - TP007)
3.Operating Permit Checklist
4.FutureMonitoring and Reporting Requirements (Addendum 1)Project Summary
Our understanding of the project is that on May 16, 2023, the Enoch City Water System received a Notification for Groundwater Required to Disinfect to Secondary Requirements letter.
In summary, the requirement was to:
Provide continuous disinfection and demonstrate compliance with secondary disinfection requirements through ongoing monitoring and reporting.
Conduct monthly source assessment bacteriologic monitoring of each of the active sources for assessment purposes. According to that letter, this source assessment monitoring was to begin
in June 2023.
Since each well in the Enoch City water system pumps directly into the distribution system, a chlorinator has been designed for each one. The purpose of this letter is to describe each
chlorinator with its associated source of water, chlorinator type, injection parameters, and entry point sampling location. Below is a description of each chlorinator:
Homestead Well Chlorinator (TP001)
The proposed Homestead Well Chlorinator will be an AccutabPowerPro 3075 Calcium Hypochlorite Tablet Feed Chlorinator. The hypochlorite solution will be a 25.7 parts per million (ppm)
solution.
This chlorinator will add chlorine to the water from the Homestead Well (WS001).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
Accu-Tab tablets are calcium hypochlorite and meet 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 325 gallons per minute (gpm) from the Homestead Well.
The chlorine dose will be adjusted automatically.
The Point of Entry (POE) sampling location is a frost-free hydrant located just outside of the Homestead Well house, prior to the distribution system.
Anderson Well Chlorinator (TP002)
The proposed Anderson Well Chlorinator will be an AccutabPowerPro 3075 Calcium Hypochlorite Tablet Feed Chlorinator. The hypochlorite solution will be a 25.7 parts per million (ppm)
solution.
This chlorinator will add chlorine to the water from the Anderson Well (WS004).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
Accu-Tab tablets are calcium hypochlorite and meet 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 180 gallons per minute (gpm) from the Anderson Well.
The chlorine dose will be adjusted automatically.
The Point of Entry (POE) sampling location is a frost-free hydrant located just outside of the Anderson Well house, prior to the distribution system.
Ravine Road Well Chlorinator (TP003)
The proposed Ravine Road Well Chlorinator will be an AccutabPowerPro 3075 Calcium Hypochlorite Tablet Feed Chlorinator. The hypochlorite solution will be a 25.7 parts per million (ppm)
solution.
This chlorinator will add chlorine to the water from the Ravine Road Well (WS005).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
Accu-Tab tablets are calcium hypochlorite and meet 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 450 gallons per minute (gpm) from the Ravine Road Well.
The chlorine dose will be adjusted automatically.

Two Point of Entry (POE) sampling locations are needed for this source as water enters the distribution system in two directions. They are both frost-free hydrants located on the transmission
lines located just outside of the Ravine Road Well house north and south of the building and prior to the distribution system.
Iron Works Well Chlorinator (TP004)
The proposed Iron Works Well Chlorinator will be an AccutabPowerPro 3075 Calcium Hypochlorite Tablet Feed Chlorinator. The hypochlorite solution will be a 25.7 parts per million (ppm)
solution.
This chlorinator will add chlorine to the water from the Iron Works Well (WS006).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
Accu-Tab tablets are calcium hypochlorite and meet 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 850 gallons per minute (gpm) from the Iron Works Well.
The chlorine dose will be adjusted automatically.
The Point of Entry (POE) sampling location is a frost-free hydrant located just outside of the Iron Works Well house, prior to the distribution system.
Tank Well Chlorinator (TP005)
The proposed Tank Well Chlorinator will be an AccutabPowerPro 3075 Calcium Hypochlorite Tablet Feed Chlorinator. The hypochlorite solution will be a 25.7 parts per million (ppm) solution.
This chlorinator will add chlorine to the water from the Tank Well (WS008).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
Accu-Tab tablets are calcium hypochlorite and meet 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 350 gallons per minute (gpm) from the Tank Well.
The chlorine dose will be adjusted automatically.
The Point of Entry (POE) sampling location is a frost-free hydrant located just outside of the Tank Well house, prior to the distribution system.
Norm Grimshaw Well Chlorinator (TP006)
The proposed Norm Grimshaw Well Chlorinator will be an AccutabPowerPro 3075 Calcium Hypochlorite Tablet Feed Chlorinator. The hypochlorite solution will be a 25.7 parts per million (ppm)
solution.
This chlorinator will add chlorine to the water from the Norm Grimshaw Well (WS009).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
Accu-Tab tablets are calcium hypochlorite and meet 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 400 gallons per minute (gpm) from the Norm Grimshaw Well.
The chlorine dose will be adjusted automatically.
The Point of Entry (POE) sampling location is a frost-free hydrant located just outside of the Norm Grimshaw Well house, prior to the distribution system.
Little Eden Well Chlorinator (TP007)
The proposed Little Eden Well Chlorinator will be an AccutabPowerPro 3075 Calcium Hypochlorite Tablet Feed Chlorinator. The hypochlorite solution will be a 25.7 parts per million (ppm)
solution.
This chlorinator will add chlorine to the water from the Little Eden Well (WS010).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
Accu-Tab tablets are calcium hypochlorite and meet 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 720 gallons per minute (gpm) from the Little Eden Well.
The chlorine dose will be adjusted automatically.
The Point of Entry (POE) sampling location is a frost-free hydrant located just outside of the Little Eden Well house, prior to the distribution system.
Plan Approval for Homestead Well Chlorinator (TP001), Anderson Well Chlorinator (TP002, Ravine Road Well Chlorinator (TP003), Iron Works Well Chlorinator (TP004), TankWell Chlorinator
(TP005), Norm Grimshaw Well Chlorinator (TP006), and Little Eden Well Chlorinator (TP007)
We have completed our review of the plans and specifications, stamped, and signed byJoseph K. Phillips, P.E., dated January 16, 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 Homestead Well Chlorinator (TP001), Anderson Well Chlorinator (TP002,
Ravine Road Well Chlorinator (TP003), Iron Works Well Chlorinator (TP004), TankWell Chlorinator (TP005), Norm Grimshaw Well Chlorinator (TP006), and Little Eden Well Chlorinator (TP007)
are hereby approved.
This approval pertains to construction only. An Operating Permit must be obtained from the Director before these seven chlorinators described above 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
The Division has determined that theEnoch City Water Systemmust provide continuous disinfection to maintain detectable chlorine residuals throughout the distribution system. As a result,
the system will be required to comply with the secondary disinfection monitoring and reporting requirements outlined in Addendum 1 of this letter once the system’s chlorinators are in
operation.
In October 2019, a Level 1 Assessment was triggered by five total coliform positive and Escherichia coli (E. coli) absent samples in the distribution system. In July 2020, a Level 2
Assessment was triggered by four total coliform positive and E. coli absent distribution samples with two total coliform positive source samples. In March of 2021, a second Level 2 Assessment
was triggered by five total coliform positive and E. coli absent distribution samples. In May of 2022, a Level 1 Assessment was triggered by two total coliform positive and E. coli absent

distribution samples. In September of 2022, a Level 2 Assessment was triggered by four total coliform positive and E. coli absent distribution samples. In February of 2023, another Level
2 Assessment was triggered by total coliform positive and E. coli absent distribution samples.
The proposed chlorinators below are intended to provide a detectable disinfectant residual in the distribution system for secondary disinfection.
Homestead Well Chlorinator (TP001)
Anderson Well Chlorinator (TP002)
Ravine Road Well Chlorinator (TP003)
Iron Works Well Chlorinator (TP004)
Tank Well Chlorinator (TP005)
Norm Grimshaw Well Chlorinator (TP006)
Little Eden Well Chlorinator (TP007)
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 ifany of the Enoch City Water System wells 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 J. Paul Wright, DEQ Southwest District Office, at [phone], or Michael Newberry, Engineering Manager, at (385)
515‑1464.
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
JPW/LT/mrn/mdbEnclosures –Operating Permit ChecklistAddendum 1- Future Monitoring and Reporting Requirementscc:Jeremy Roberts, Southwest Utah Public Health Dept., [e-mail].
Paul Wright, P.E., DEQ Southwest District Engineer, [e-mail] White, Enoch City Water System, [e-mail] Rob Dotson, Enoch City Manager, [e-mail]
Mcleod, Sunrise Engineering, [e-mail] Phillips, P.E., Sunrise Engineering, [e-mail]
Luke Treutel, Division of Drinking Water, [e-mail]
Sarah Page, Division of Drinking Water, [e-mail]
Sitara Federico, Division of Drinking Water, [e-mail] 11004 13375 TPs PA
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 Secondary Monitoring and Reporting Requirements
Chlorine Monitoring & Reporting Requirements
The water system will be required to meet secondary disinfection requirements once these seven chlorinators are 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. 
Secondary 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 plan approval 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 chlorine residual concentration, measured as free chlorine, at the chlorinator POE sampling location a minimum of daily. [R309-210- 8(3)(a)(ii)]
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 secondary 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)]
Disinfection Byproducts Monitoring & Reporting Requirements
In addition to the chlorine monitoring and reporting described above, the system will be required to monitor disinfection byproducts as a result of introducing disinfection to the system.
According to our records, the water system serves a population of approximately 6,500 people and serves groundwater from the system’s sources. Based on this information, the water system
will be required to collect samples from two (2) Disinfection Byproduct (DBP) sampling sites every year. Each disinfection byproduct sample should be a paired sample of Total Trihalomethanes
(TTHM) and Haloacetic Acids (HAA5).
Water system staff will need to select two (2) sites to be sampled for DBPs. A sampling plan form will be enclosed with the operating permit letter and will need to be completed and
submitted to the Division within 30 days from the date of the operating permit letter. The specifics relating to the number and frequency of required samples will be provided in the
operating permit letter.