DDW-2024-007426

May 2, 2024
Larry Famuliner
Farmington City Water System
720 West 100 North
Farmington, Utah 84025
Subject:Plan Approval and Exception to R309-535-11(1)(c)(ii)(D), Design for Pressure Filters, Shepard Creek Well Equipping and Chlorinator, Fluoride Addition and Manganese Treatment
Facility (WS009, TP009);Farmington City Water System, System #06004, File #11141
Dear Larry Famuliner:The Division of Drinking Water (the Division) received the plans and specifications for the proposed equipping Shepard Creek Well and construction of a chlorinator,
fluoride addition, and manganese treatment facility from your consultant, Jordan DeMann with CRS Engineers on April 17, 2023. Review comments were sent on May 4, 2023. The revised plans
were received on January 9, 2024. Additional review comments were provided on January 17, 2024. The final set of revised plans was received on March 27, 2024.The Division issued Plan
Approval for drilling the Shepard Creek Well on June 8, 2018. An exception to R309-515-6-6(i), Well Sealing Techniques and Requirements, was issued on December 22, 2020, for installing
a 98-foot grout seal (File #11141).The letter includes the following sections and addenda for the Shepard Creek Well (identified as WS009 in the Division’s database) and Chlorinator,
Fluoride Addition and Manganese Treatment Facility (TP009):Project Summary for Shepard Creek Well (WS009) and Chlorinator, Fluoride Addition and Manganese Treatment Facility (TP009)Plan
Approval for Shepard Creek Well (WS009) and Chlorinator, Fluoride Addition and Manganese Treatment Facility (TP009)Exception to R309-535-11(1)(c)(ii)(D), Design for Pressure Filter,
for Manganese Treatment (TP009)New Source Chemistry RequirementsDrinking Water Source Protection RequirementsOperating Permit ChecklistFuture Monitoring and Reporting Requirements (Addendum
1)
Project Summary
Our understanding of the project includes equipping the Shepard Creek Well (WS009) with a 900-gallon-per-minute (gpm) submersible pump and a 75 horsepower (HP) motor and the construction
of a new well house to include the wellhead and discharge piping, a sodium hypochlorite feed system, fluoride addition and manganese removal filtration (TP009).
Based on our plan review, the Division understands that the Shepard Creek Chlorinator, Fluoride Addition, and Manganese Treatment Facility (TP009) will be designed as follows:
Sodium Hypochlorite Addition
The proposed chlorinator is an adding sodium hypochlorite solution of 12.5% concentration.
This chlorinator will add chlorine to the water from Shepard Creek Well (WS009).
This chlorinator is intended to provide secondary disinfection in the distribution system.
The chlorinated water will go to the distribution system directly.
The proposed T-Chlor for disinfection meets the ANSI/NSF 60 standard.
The proposed design target dose of 0.8 mg/L or ppm (measured as free chlorine) is based on a typical flow of 900 gpm from Shepard Creek Well (WS009).
The chlorine dose will be adjusted by an automatic flow-paced control.
Fluoride Addition
The fluoride facility will be located in a separate room in the well house.
The fluoride facility will include a hydrofluorosilicic acid feed system using a solution with 19.2% fluoride concentration.
The fluoride dosing pump is a flow-paced Blue-White Flexflow M2 Peristaltic Metering Pump with interlock protection wired to the well pump so it can only operate when the well is in
operation.
The background fluoride level in the Shepard Creek Well is 0.2 mg/l and a dosing pump will supply a target dose of 0.5 mg/l. This target dose meets the Davis County requirements for
fluoride levels.
The design includes a secondary containment basin for the day tank, a double-walled bulk tank, an emergency eye-wash station, a shower, and proper ventilation.
The final fluoride levels can be verified downstream of the injection point from the Hach CA610 fluoride continuous analyzer as well as a sample tap.
Manganese Filtration
A PM-200 Manganese Dioxide Filter, supplied by Pureflow Filtration, will remove manganese in the Shepard Creek Well (WS009).
The filter media and vessel have NSF 60/61 Certification.
The backwash supply for the media will be finished water from a connection to the distribution system and will have cross-connection protection through a reduced pressure principle (RP)
backflow prevention assembly.
A filter-to-waste line will discharge into a floor drain with an air gap.
The backwash water will discharge to an underground tank with an air gap.
A sample tap downstream of the filters will be provided for finished water samples.
Plan Approval for Shepard Creek Well Equipping (WS009) and Chlorinator, Fluoride Addition and Manganese Treatment Facility (TP009)
We have received the following information for the Shepard Creek Well (WS009) and Chlorinator, Fluoride Addition and Manganese Treatment Facility (TP009):
Certification of well seal.
Well driller’s report (well log).
Aquifer drawdown test results (step drawdown test and constant-rate test).
New Source Chemical Analysis of the well water.
Plans and specifications for equipping the well.
Pump information
Wellhead discharge piping
Well house design
Chlorinator design
Fluoridator design
Manganese Filtration design
We have completed our review of the plans and specifications, stamped, and signed by Joshua Prettyman, P. E., and dated November 25, 2020, 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 equipping the Shepard Creek Well (WS009) and the Chlorinator, Fluoride

Addition and Manganese Treatment Facility (TP009) are hereby approved.
This approval pertains to construction only. An Operating Permit must be obtained from the Director before the well and treatment facility may be put into service. A checklist outlining
the well approval process, including the items required for issuing an operating permit for this well is enclosed for your information. Enclosed please also find an Operating permit
Checklist for other components of this project.Approvals or permits from the local authority or county may be necessary before beginning construction of this project. As the project
proceeds, 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. Exception to R309-535-11(1)(c)(ii)(D),
Design for Pressure Filter, for Manganese Filters (TP009)On March 26, 2024, the Division received your request for an exception to Rule R309-535-11(1)(c)(ii)(D), Design for Pressure
Filter. According to this rule, the top of the backwash water collectors shall be at least twenty-four (24) inches above the surface of the media. It is our understanding that the specified
iron and manganese filters, manufactured by Pureflow Filtration, uses a patented media that when backwashed has 100% fluidization and only 30% expansion of the filter bed. This is due
to the media being more dense than typical green sand or other media which have 50% expansion. The system is designed with 18 inches between the backwash water collectors and the top
of the media surface and with expansion during a backwash, the media comes within 2 to 3 inches of the backwash water collectors to prevent the media from being washed out of the filter.
You have indicated that the Pureflow media remains stable when backwashing, as opposed to a typical media that has a boiling effect.The basis for your request for an exception to Rule
R309-535-11(1)(c)(ii)(D) is that the Pureflow iron and manganese filter meets the intent of the rule to prevent filter media from being washed away during a backwash.
On this basis, an exception to Rule R309-535-11(1)(c)(ii)(D), Design for Pressure Filter, ishereby granted for the Manganese Filters (TP009).
This Exception may be rescinded any time if new evidence indicates that the basis of this exception is no longer valid or a public health risk exists due to this exception.
New Source Chemistry Requirements
To complete the testing requirements for new sources, please submit the following samples from Shepard Creek Well (WS009): Radium-226, Radium-228, and Gross Alpha particle activity.
These samples will be required to be collected prior to the issuance of the permanent operating permit. Please collect these pre-treatment samples from the sample tap at Shepard Creek
Well (WS009) and label them accordingly.
Additionally, prior to the issuance of an operating permit the system will be required to submit a Manganese sample of the finished water after it has undergone treatment at the treatment
facility (TP009). Please indicate that this sample was collected at TP009 on the laboratory paperwork.
Drinking Water Source Protection Requirement
The Division conditionally concurred with the Preliminary Evaluation Report (PER) in a letter dated October 11, 2017. Based on the Well Driller’s Report and information provided in the
Well Completion Report for this source, the conditions under which the PER was concurred with have been fulfilled. This source is classified as being produced from a “protected aquifer”.
As such, the sewer lines and laterals located within source protection zone two do not need to be constructed in accordance with R309-515-6. If there are sewer lines or laterals located
within source protection zone one, they will need to meet the requirements of R309-515-6 and R309-600-13(3). A full Drinking Water Source Protection (DWSP) plan was required within one
year of concurrence of the Preliminary Evaluation Report (PER). The full DWSP plan has not been received. The system is required to submit a full DWSP plan within 180 days of this source
becoming active. The system is also required to provide proof that a map of the zones has been provided to Davis County to be covered by the Davis County Source Protection Ordinance
before the well can receive an Operating Permit. If you have questions about the source protection requirements, please contact Deidre Beck at [phone] or via email at [e-mail].
Secondary Disinfection Requirements
The plan review of the proposed Shepard Creek Well Chlorinator (TP009) is based on providing secondary disinfection. When this chlorinator is installed and placed in operation after
the Operating Permit issuance, the Farmington City Water System will be required to demonstrate ongoing compliance with the disinfection requirements described in Addendum 1 of this
letter.
The Division shall be informed by telephone within eight (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 the Shepard Creek Well (WS009) 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 Julie Cobleigh, of this office, at [phone], or me at [phone].
Sincerely,
Russell Seeley, P.E.
Assistant Director
JJC/LT/DLB/SMF/mrn/mdbEnclosures─ Well Approval Checklist; Operating Permit Checklist Addendum 1- Future Elective Monitoring and Reporting Requirementscc:Jay Clark, Davis County
Health Department, [e-mail] Famuliner, Farmington City Water System, [e-mail] DeMann, CRS Engineers, [e-mail]
Cobleigh, P.E., Division of Drinking Water, [e-mail]
Luke Treutel, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]
Sitara Federico, Division of Drinking Water, [e-mail]
Deidre Beck, P.G., Division of Drinking Water, [e-mail]
Nagendra Dev, P.E., Division of Drinking Water, [e-mail]
jcobleigh 06004 11141 WS009 TP009Division of Drinking WaterChecklist for New Public Drinking Water Wells
(Per Utah Administrative Code, Rule R309-515-6)
System Name:System Number:Well Name & Description:1.Approval to Drill the Well
☐Project Notification Form (PNF)
☐Preliminary Evaluation Report (PER) concurrence
☐Well drilling specifications and plans
☐Valid Start Card or authorization to drill letter from the Division of Water Rights2.Approval to Equip the Well
☐PNF (if the well drilling and well equipping are designed by different consultants)
☐Well location data
☐Certification of well seal

☐Well driller’s report (well log)
☐Aquifer drawdown test results (step drawdown test & constant-rate test) for well yield determination
☐Chemical analyses of the well water
☐Plans and specifications for equipping the well
☐Pump information (e.g., pump specifications, pump curve & operating point, motor information, etc.)
☐Wellhead discharge piping
☐Well house design3.Operating Permit to Introduce the Well Water
☐Documentation of valid water right(s)
☐Recorded land use agreements, or documentation that the requirements for coverage under the City/County source protection ordinance have been met
☐Design engineer’s certification of conformance with plan approval conditions
☐Design engineer’s certification of rule conformance for any deviation from approved plans
☐As-built or record drawings
☐Evidence of O&M manual delivery to system owner☐Satisfactory bacteriological results as evidence of proper flushing and disinfection
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 (every 1200 feet, end-of-line, each branch, etc.)☐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: Radium-226, Radium-228 and Gross Alpha particle activity taken from well sample tap prior to treatment and a Manganese sample taken from the filter effluent.☐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 Elective Monitoring and Reporting Requirements
Chlorine Monitoring & Reporting Requirements
The water system will be required to meet elective 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.
Elective Disinfection Requirements and Reporting
Chlorine Residual ‒ Point of Entry (POE) to Distribution System
The POE sampling location is identified as EP009 in the Division’s database. The location of the entry point is the chlorine analyzer located on the discharge line leaving 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 chlorine residual concentration, measured as free chlorine, at the chlorinator POE sampling location a minimum of daily. [R309-210- 8(3)(a)(ii)]Our
records show that your water system serves 26,500 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 will be 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 elective 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 The operating permit will include requirements for monthly Escherichia Coli (E. Coli) and nitrate sampling at Shepard Creek Well (WS009), prior to any treatment, for
the months the Shepard Creek Well (WS009) is in operation or accessible for a minimum of two operating seasons. This monitoring is required to evaluate the quality of the water coming
from Shepard Creek Well (WS009) to determine whether primary disinfection treatment is required or not, as well as to support the basis for issuing an exception for the 98- foot well
grout seal (File #11141). Additional monitoring and/or disinfection requirements may be assigned depending on the results of the assessment monitoring.Take monthly bacteriological samples

for the months this source is accessibleThe source sampling requirement shall begin once the operating permit is issued and the source is in operation and extend to cover the duration
of at least 18 months, sufficient to span two (spring/summer or peak season) cycles. The sampling location of the source water bacteriological samples needs to be labeled as WS009. The
source bacteriological sampling is in addition to the monthly total coliform sampling in the distribution system (DS001) that has been in place for your water system. The required source
sampling data must be submitted to the Division for evaluation to determine whether primary disinfection is required or not.In the result of an E. coli positive sample, please contact
Sitara Federico at [e-mail] or [phone] within 24 hours of notification. Take quarterly nitrate samplesThe source sampling requirement shall begin once an operating permit
has been issued and extend to cover the duration that is sufficient to gather at least 4 consecutive quarters of nitrate sample results.The sampling location of the source water nitrate
samples needs to be labeled as WS009.