DDW-2024-014669

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144830 • Salt Lake City, UT 84114-4830
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF DRINKING WATER
Tim Davis
Director
March 14, 2023

Tom Ward
Sandy City Water System
9150 South 150 East
Sandy City, Utah 84070

Subject: Plan Approval, Paradise Valley Well Chlorinator (TP038);
Sandy City Water System, System #18028, File #13188

Dear Tom Ward:

The Division of Drinking Water (the Division) received the plans and specifications for the
proposed Paradise Valley Well Chlorinator (TP038) from your consultant, Sterling Woodruff
from CRS Engineering & Surveying on November 17, 2022. Written review comments were
provided to you on November 17, 2022. The Division received additional plans and specifications
on February 27, 2023. This project has met the conditions for receiving a plan approval.

Our understanding of the project is the installation of a tablet chlorinator at the Paradise Valley
Well (WS035) to meet secondary disinfection. Paradise Valley Well Chlorinator is identified as
TP038 in the Division’s database.

The plan review of the proposed Paradise Valley Well Chlorinator (TP038) has been completed
according to the following:

1. The proposed Paradise Valley Well Chlorinator (TP038) is an ACCU-Tab PowerPro
Model 3075 (22-gallon solution tank) calcium hypochlorite tablet chlorination system
manufactured by Accu-Tab. The chlorine solution concentration varies depending on the
flow rate of the water dissolving the tablets. Accu-Tab tablets contain 65% available
chlorine, and the chlorine solution will be maintained at a maximum chlorine
concentration of 0.05%.
2. This chlorinator will add chlorine to the water from Paradise Valley Well (WS035).
3. This chlorinator is intended to provide secondary disinfection that will go directly to the
distribution system.
Tom Ward
Page 2 of 3
March 14, 2023

4.  The proposed Accu-tab calcium hypochlorite tablets used for disinfection meet the
ANSI/NSF 60 standard.
5. The proposed design target dose of 1.0 mg/L or ppm (measured as free chlorine) is based
on a typical flow of 2,200 gallons per minute (gpm) from Paradise Valley Well (WS035).
6. The chlorine dose is pumped into the pressurized system utilizing a Grundfos CR 3-21.
The dose will be adjusted manually for the constant flow from Paradise Valley Well
(WS035). The chlorinator will automatically shut off if there is no positive flow as the
power to the chlorinator is locked out unless the meter in the well room senses positive
flow past the meter.

We have completed our review of the plans and specifications, stamped, and signed by Mark
Chandler, P.E., 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
Paradise Valley Well Chlorinator (TP038) are hereby approved.

This approval pertains to construction only. An Operating Permit must be obtained from the
Director before Paradise Valley Well Chlorinator (TP038) 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 Paradise Valley Well Chlorinator (TP038) is based on providing
secondary disinfection. When this chlorinator is installed and placed in operation after the
Operating Permit issuance, the Sandy City Water System will be required to demonstrate ongoing
compliance with the following secondary disinfection requirements:  

1. Chlorine Residual ‒ Distribution System (DS001)
a. This water system will be required to maintain a detectable residual throughout the
distribution system. It is recommended to maintain the chlorine residual above 0.1
ppm in the distribution system. [R309-520-5]
b. The chlorine residual measured in the distribution system must not exceed the
maximum residual disinfectant level (MRDL) of 4.0 mg/L (measured as free
chlorine). [R309-200-5(3)(c)(iv)]
c. This water system will be required to take a minimum of three (3) chlorine
residual samples per week at varying locations throughout its distribution
system (DS001). [R309-105-10(1)(c)]
Tom Ward
Page 3 of 3
March 14, 2023

d. Take distribution system chlorine residuals in conjunction with total coliform
sampling. [R309-215-10(3) and (4)]

2. Chlorine Residual ‒ Point of Entry to Distribution System (EP035)
a. The Point of Entry (POE) sampling location for the Paradise Valley Well
Chlorinator will be the sampling tap located at the piping exiting the well house.
This POE sampling location will be identified as EP035 in the Division’s database.
b. This water system will be required to maintain a minimum of 0.2 mg/L residual
(measured as free chlorine) at the POE sampling location. [R309-215-5(3) and
R309-215-10(2)]
c. The chlorine residual measured at the POE sampling location must not exceed the
maximum residual disinfectant level (MRDL) of 4.0 mg/L (measured as free
chlorine). [R309-200-5(3)(c)(iv)]
d. This water system will be required to record and report the free chlorine residual at
the Paradise Valley Well Chlorinator POE sampling location (EP035) a
minimum of 3 days a week. [R309-210-8(3)(a)(ii)]

Please be aware if any water source of Sandy City Water System is found to require primary
disinfection in the future per R309-200-5(7)(a)(i), additional regulations will apply. 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 Sarah Romero, of this office, at
[phone], or me at [phone].

Sincerely,

Michael Newberry, P.E.
Engineering Manager

SRR/LT/mrn/mdb

Enclosures – Operating Permit Checklist

cc: Matthias Neville, Salt Lake County Health Department, [e-mail]
Fuaad Hararah, Salt Lake County Health Department, [e-mail]
Mark Chandler, Sandy City Water System, [e-mail]
Sterling Woodruff, Sandy City Water System, [e-mail]
Tom Ward, Sandy City Water System, [e-mail]
Sarah Romero, Division of Drinking Water, [e-mail]
Luke Treutel, Division of Drinking Water, [e-mail]

DDW-2023-003493  

Utah Division of Drinking Water ― Checklist for Issuing Operating Permits
Water 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 Mains
Two 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 Facilities
One or more samples, none positive
☐ ANSI/AWWA C653-13 AWWA Standard for Disinfection of Water Treatment
Plants
Two consecutive samples per unit, none positive, no less than 30 minutes apart
☐ ANSI/AWWA C654-13 AWWA Standard for Disinfection of Wells
Two 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