DDW-2024-013114

November 6, 2024
Maegan Belmont
Diamond Valley Acres
8354 North Sapphire Drive
St George, Utaj 84770
Subject:Plan Approval, Topaz Well #1 Chlorinator (TP001), Whittaker Well Chlorinator (TP002); Diamond Valley Acres, System #27065, File #16873
Dear Maegan Belmont:The Division of Drinking Water (the Division) received the plans and specifications for Topaz Well #1 Chlorinator (TP001) and Whittaker Well Chlorinator (TP002) from
your consultant, Riley Vane, PE with Jones & DeMille Engineering on October 11, 2024. This project has met the conditions for receiving a plan approval.
The letter includes the following sections and addenda:

1.Project Summary forTopaz Well #1 Chlorinator (TP001) and Whittaker Well Chlorinator (TP002)
2. Plan Approval for Topaz Well #1 Chlorinator (TP001) and Whittaker Well Chlorinator (TP002)
3.Operating Permit Checklist 
4.FutureMonitoring and Reporting Requirements (Addendum 1)Project Summary
Our understanding of the project is that due to the history of positive total coliform and E. Coli tests, tablet chlorination treatment plants will be installed for Topaz Well #1 (WS008)
and Whittaker Well (WS005) to provide secondary disinfection. The corresponding chlorination treatment plans will be known in the Division’s data base as Topaz Well #1 Chlorinator (TP001)
and Whittaker Well Chlorinator (TP002).
The plan review of the proposed Topaz Well #1 Chlorinator (TP001)has been completed according to the following:
The proposed Topaz Well #1 Chlorinator (TP001) is a tablet chlorinator, using calcium hypochlorite tablets of NSF 60 certification. The tablet chlorinator is an Accu-tab 2075P.
This chlorinator will add chlorine to the water from Topaz Well #1 (WS008).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go to the Booster Pump Tank (ST002).
The proposed calcium hypochlorite for disinfection meets the ANSI/NSF 60 standard.
The proposed design target dose of 2 ppm (measured as free chlorine) is based on a typical flow of 700 gallons per minute (gpm) from Topaz Well #1.
The estimated chlorine usage is 0.70 lbs/hr.
The chlorine dose will be adjusted by an automatic flow-paced control.
The Point of Entry (POE) sampling location will be at TP001.
The plan review of the proposed Whittaker Well Chlorinator (TP002) has been completed according to the following:
The proposed Whittaker Well Chlorinator (TP002) is a tablet chlorinator, using calcium hypochlorite tablets of NSF 60 certification. The tablet chlorinator is an Accu-tab 2075P.
This chlorinator will add chlorine to the water from Whittaker (WS005).
This chlorinator is intended to provide secondary disinfection in the distribution system. 
Chlorinated water will go directly into the distribution system.
The proposed calcium hypochlorite for disinfection meets the ANSI/NSF 60 standard.
The proposed design target dose of 2 ppm (measured as free chlorine) is based on a typical flow of 200 gallons per minute (gpm) from Whittaker Well.
The estimated chlorine usage is 0.20 lbs/hr.
The chlorine dose will be adjusted by an automatic flow-paced control.
The Point of Entry (POE) sampling location will be at TP002.
Plan Approval for Topaz Well #1 Chlorinator (TP001), Whittaker Well Chlorinator (TP002)
We have completed our review of the plans and specifications, stamped, and signed byRiley Vane, P.E., dated October 10, 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 Topaz Well #1 Chlorinator (TP001) and Whittaker Well Chlorinator (TP002)are hereby
approved.
This approval pertains to construction only. An Operating Permit must be obtained from the Director before Topaz Well #1 Chlorinator (TP001) and Whittaker Well Chlorinator (TP002)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 plan review of the proposed Topaz Well #1 Chlorinator (TP001) and Whittaker Well Chlorinator (TP002) is based on providing secondary disinfection. When this chlorinator is installed
and placed in operation after the Operating Permit issuance, the Diamond Valley Acres 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 Topaz Well #1 or Whittaker Well is found to require additional disinfection 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 Cameron Draney, PE, of this office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager

CLD/mrn/mdbEnclosures –Operating Permit ChecklistAddendum 1- Future Monitoring and Reporting Requirementscc:Jeremy Roberts, Southwest Utah Health Department, [e-mail]
Vanes, PE, Jones & DeMille Engineering, [e-mail] Belmont, Diamond Valley Acres, [e-mail] Draney, PE, Division of Drinking Water, [e-mail]
Luke Treutel, Division of Drinking Water, [e-mail] (disinfection & DBP)
David Kruse, Division of Drinking Water, [e-mail] (arsenic, inorganics, organics, nitrate, rads)
Paul Wright, PE, Department of Environmental Quality, [e-mail] 27065 16873 PA Diamond Valley Acres Chlorinators
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 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.
Secondary Disinfection Requirements and Reporting
Chlorine Residual ‒ Points of Entry (POE) to Distribution System
The POE sampling locations will be identified in the Division’s database. The locations 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 locations. [R309-215-16(3)(b)(iii)(A)(I) and (II)]
The chlorine residual concentration measured at the POE sampling locations 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 (EP001 & EP002). [R309-215-10(1)]Our records show that your water system
serves 1,340 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 secondary disinfection requirements, the water system must complete monthly operational reports for each active chlorinator using a template approved
by the Division.
The monthly operational reports are submitted quarterly. The reports are due to the Division by the 10th day following the end of each reporting quarter (i.e., January 10th, April 10th,
July 10th and October 10th). The reports can be submitted by hardcopy, fax, or by uploading them to the Division’s chlorine residual reporting form which can be found at MRDL.utah.gov.
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 1,340 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 per 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.