DDW-2024-009219

July 29, 2024
James Waltz
Grantsville City Water System
429 East Main Street
Grantsville, Utah 84029
Subject:Operating Permit, Marshall Well and Chlorinator (WS008, TP005); Grantsville City Water System, System #23002, File #12638
Dear James Waltz:The Division of Drinking Water (the Division) received your request for the Operating Permit for the Marshall Well and Chlorinator (WS008, TP005) from your consultant,
Robert Rousselle of Ensign Engineering on July 10, 2024. The Division issued Plan Approval for drilling this well on August 2, 2011, and Plan Approval for equipping this well on October
19, 2022. Division staff conducted an onsite construction inspection of this project on May 30, 2024.
Our understanding of the project was the drilling, and developing, of 16-inch diameter drinking water well (identified as WS008 in the Division’s database) replacing the existing Johnson
Irrigation Well. The well was drilled to a depth of 630 feet below ground surface. In addition, a new well house was constructed including associated piping and fittings, SCADA control,
and appurtenances. The well was equipped with a 2,500-gallon per minute (gpm) vertical turbine oil lubricated line shaft pump.
The project also included the installation of a new gaseous chlorinator (identified as TP005 in the
Division’s database) Evoqua Model S10K. The well house is located south of the residence at 212 Box Elder Drive, Grantsville, Utah.
The Marshall Well Chlorinator (TP005) included in this project has been completed according to
the following:
1. The proposed Marshall Well Chlorinator is a gas chlorinator, Evoqua Model S10K.
2. This chlorinator will add chlorine to the water from the Marshall Well (WS008).
3. This chlorinator is intended to provide secondary disinfection.
4. The chlorinated water will go directly to the distribution system (DS001).
5. The proposed gaseous chlorine used for disinfection meets the ANSI/NSF 60 standard
6. The proposed design target dose of 0.2 mg/L or ppm (measured as free chlorine) is
based on a typical flow of 2,500 gallons per minute (gpm) from Marshall Well
(WS008).
7. The chlorine dose will be adjusted by an automatic flow-paced control adjusted
rotometer set for the constant flow from Marshall Well (WS008).
We have received the following information for Marshall Well and Chlorinator (WS008, TP005):
Design engineer’s statement of conformance with approval conditions
Documentation of valid water right(s).
Evidence of O&M manual delivery.
As-built or record drawings.
Recorded land use agreements.
Satisfactory bacteriological results as evidence of proper disinfection and flushing.
We have determined that all conditions for issuing an operating permit have been met. On this basis, an Operating Permit for Marshall Well and Chlorinator (WS008, TP005)is hereby issued
as constituted by this letter. You may now place Marshall Well and Chlorinator (WS008, TP005) in service in your water system.
Please maintain a copy of this letter with your permanent records for future reference.
The equipped well pump capacity of the Marshall Well is 2,500 gallons per minute (gpm). The safe yield of the Marshall Well is rated at 1,667 gpm, which is calculated based on two-thirds
of the constant-rate aquifer drawdown test results at 2,500 gpm. The safe yield of 1,667 gpm is the basis for determining the maximum number of connections that the Marshall Well can
serve.
Source Monitoring Requirements
Issuance of this Operating Permit changes your water system’s monitoring and reporting
requirements. The monitoring requirements for this well are given online waterlink.utah.gov and can also be found below in addendum 1. Please contact David Kruse at (385)-566-7789 or
[e-mail] for questions regarding the source monitoring and reporting requirements for your water system.
Secondary Disinfection Requirements
The Grantsville City water systemis not required to disinfect the Marshall Well (WS008) based on bacteriological source sample results currently available. The water system has elected
to install the Marshall Well Gas Chlorinator (TP005) to provide a detectable disinfectant residual in the distribution system for secondary disinfection.
Please be aware that, if any water source of the Grantsville 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 water system is required to demonstrate ongoing compliance with the secondary disinfection requirements outlined in Addendum 1 of this letter as long as the Marshall Well Gas Chlorinator
(TP005) is in operation.
There may be new changes in monitoring and reporting requirements in the future as the Division continues to improve the disinfection monitoring and reporting practices. Failure to adhere
to required monitoring and reporting will result in violations and the assessment of IPS points.
If you have any questions regarding this Operating Permit, please contact Brent Arns, of this office, at [phone], or Michael Newberry, P.E., Permitting and Engineering Support
Manager, at [phone].
Sincerely,
Nathan Lunstad, P.E.
Director
BA/LT/DK/MN/mrn/mdbcc:Brian Slade, Tooele County Health Department, [e-mail] Rousselle, P.E., Ensign Engineering, [e-mail] Waltz, Grantsville
City Water System, [e-mail] Noble, P.G., Division of Drinking Water, [e-mail] Berger, Division of Drinking Water, [e-mail] Treutel, Division

of Drinking Water, [e-mail] Kruse, Division of Drinking Water,[e-mail] Federico, Division of Drinking Water, [e-mail] Yee, Division of Drinking
Water, [e-mail] Martin, P.E., Division of Drinking Water, [e-mail] Arns, Division of Drinking Water, [e-mail] 23002 12638 OP Marshal Well WS008 TP005
Addendum 1 - Elective Monitoring and Reporting Requirements
Chlorine Monitoring & Reporting Requirements
The water system is required to meet elective 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.
Elective Disinfection Requirements and Reporting
Chlorine Residual ‒ Point of Entry (POE) to Distribution System
The POE sampling location is identified as EP005 in the Division’s database. This location is outside the well house after the meter. 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 three (3) times per week. [R309-215-
10(1)]
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)]
Source Monitoring Requirements
Issuance of this Operating Permit changes your water system’s monitoring and reporting
requirements. The monitoring requirements for this well are given below. An updated monitoring schedule can be viewed any time at waterlink.utah.gov under the Water Monitoring section.
Please contact David Kruse at (385)-566-7789 or [e-mail] for questions regarding the source monitoring and reporting requirements for your water system.Facility with new requirementsAnalyte(s)
Required# of samplesSampling FrequencyNext Due DateRule ReferenceWS008 Marshall Well Pesticides1Quarterly10/01/2024-12/31/2024R309-205-6(1)(d)Radionuclides1Quarterly10/01/2024-12/31/2024R309-205-7(1)(b)Nitrate1Yearly01/01/2024-12/31/2024R309-205-5(4)(a)Volatile
Organic Contaminants1Yearly01/01/2024-12/31/2024R309-205-6(2)Inorganics & Metals1Every three years01/01/2023-12/31/2025R309-205-5(3)(a)Sulfate, Sodium, TDS1Every three years01/01/2023-12/31/2025R309-205-5(3)(a)