DDW-2024-010097

August 19, 2024
Neal Winterton
Pleasant Grove City
70 South 100 East
Pleasant Grove, Utah 84062
Subject:Operating Permit, Gibson Well Chlorinator (TP013);
Pleasant Grove City, System #25022, File #12713
Dear Neal Winterton:
The Division of Drinking Water (the Division) received a request for an Operating Permit for Gibson Well Chlorinator from your consultant, Marvin Allen, P.E., with Hansen, Allen, and
Luce, on July 15, 2024. The Division issued a temporary Operating Permit for this facility on September 8, 2021. The Division extended the temporary Operating Permit expiration date
on July 28, 2023. This project has met all conditions for receiving an operating permit.
Our understanding of the project is that Pleasant Grove City installed an emergency gas chlorinator at the Gibson Well (WS013) in response to Escherichia coli (E. coli) positive (EC+)
samples taken from the well in August 2021. The chlorinator consisted of two (2) 150-pound chlorine gas cylinders, a new chlorine gas vacuum regulator, and a 1.5 horsepower booster pump
and ejector. That chlorinator has been moved into a new, separate room within the Gibson Well well house and is now properly heated and ventilated. A 1-inch diameter PVC line pulls water
from the Gibson Well (WS013) discharge line into the chlorine room for dosing, then returns it to the well discharge line. Outside of the well house, a ½-inch diameter HDPE supply line
pulls water to a chlorine analyzer located within the well house. The Gibson Well Chlorinator is identified as TP013 in the Division’s database.
The Gibson Well Chlorinator (TP013) included in this project has been completed according to the following:
The Gibson Well Chlorinator is a gas chlorinator intended to provide secondary disinfection.
The Gibson Well Chlorinator treats water from the Gibson Well (WS013).
The chlorine gas is added to the water at the Gibson Well well house.
The chlorinated water flows into the distribution system.
The chlorine gas used for disinfection meets the ANSI/NSF 60 standard.
A design target dose of 0.4 mg/L (ppm) of free chlorine is based on a typical flow of 2,500 gallons per minute (gpm) from the Gibson Well (WS013).
The chlorine dose is adjusted by a manually adjusted rotameter set for the constant flow rate from Gibson Well.
We have received the following information for Gibson Well Chlorinator:
Certification of Rule Conformance with plan approval conditions by a professional engineer and changes made during construction were in conformance with rules R309-500 through 550.
As-built drawings.
Satisfactory bacteriological results as evidence of proper disinfection and flushing.
Evidence of operation and maintenance manual delivery.
At least 18 months of source monitoring samples required as part of the temporary Operating Permit.
We have determined that all conditions for issuing an operating permit have been met. On this basis, an Operating Permit for Gibson Well Chlorinatoris hereby issued as constituted by
this letter. You may keep Gibson Well Chlorinator in service in your water system.
Please maintain a copy of this letter with your permanent records for future reference.
Secondary Disinfection Requirements
Pleasant Grove City is required to demonstrate ongoing compliance with the secondary disinfection requirements outlined in Addendum 1 of this letter as long as the Gibson Well Chlorinator
(TP013) is in operation.
Please be aware that if any water source of the Pleasant Grove 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.The issuance
of this Operating Permit resolves the following deficiencies for your water system:G001 UNAPPROVED FACILITY IN SERVICETD09 CHLORINE ROOM EXHAUST FAN SUCTION NOT LOCATED NEAR FLOORTD10
CHLORINE ROOM AIR INLET NOT LOCATED NEAR CEILING THROUGH WALL LOUVERSTD12 LACK SEPARATE SWITCHES FOR FAN AND LIGHTS NEAR CHLORINE ROOM ENTRANCEAn updated IPS report isavailable at https://waterlink.utah.gov.
Please contact Jennifer Yee at [phone] or [e-mail] for questions related to your water system’s IPS report or deficiencies.
If you have any questions regarding this Operating Permit, please contact Hunter Payne, of this office, at [phone], or Michael Newberry, P.E., Permitting and Engineering Support
Manager, at [phone].
Sincerely,
Russell Seeley, P.E.
Assistant Director
HP/mrn/mdbcc:Daymon Swenson, Utah County Health Department, [e-mail] Allen, P.E., Hansen, Allen, & Luce Inc., [e-mail] Winterton, Pleasant Grove
City, [e-mail] Martin, P.E., Division of Drinking Water, [e-mail] Arns, Division of Drinking Water, [e-mail] Payne, Division of Drinking Water,
[e-mail] Treutel, Division of Drinking Water, [e-mail] Sitara Federico, Division of Drinking Water, [e-mail] Yee, Division of Drinking Water, [e-mail]
25022 12713 TP013 OP
Addendum 1 
 Secondary Monitoring and Reporting Requirements 
Chlorine Monitoring & Reporting Requirements
The water system is required to meet secondary disinfection requirements. As a part of these requirements, the water system is required 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 is identified as EP013 in the Division’s database. This location has been identified as the online chlorine analyzer located in the well house. 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 (EP013). [R309-210- 8(3)(a)(ii)]
Our records show that your water system serves 40,000 people. Please be aware that R309-215-16(3)(b)(iii)(A)(I) requires water systems serving greater than 3,300 people to continuously
monitor the POE chlorine residuals. Therefore, an online analyzer to continuously monitor the POE chlorine residuals entering the distribution system is needed.
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)]