DDW-2024-011199

September 24, 2024
Christopher Robinson
Oquirrh Mountain Water Company
7780 North Buckhorn Road
Stansbury Park, Utah 84074
Subject:Plan Approval, Well Equipping, Hole in the Rock Backup Well (WS008), Hole in the Rock Backup Well Chlorinator (TP003); Oquirrh Mountain Water Company, System #23076, File #15783
Dear Christopher Robinson:The Division of Drinking Water (the Division) received the plans and specifications for the proposed Hole in the Rock Backup Well (WS008), Hole in the Rock
Backup Well Chlorinator (TP003) from your consultant, Jacob Nielsen and Hansen, Allen & Luce Engineers on July 18, 2024. The Division issued an After-the-Fact (ATF) Plan Approval for
drilling the Hole in the Rock Backup Well (WS008) on May 5, 2022, File #12942. Written review comments were sent to your consultant on July 31, 2024. Final response was received from
your consultant on August 26, 2024.
Our understanding of the project is the equipping of the Hole in the Rock Backup Well (identified as WS008 in the Division’s database), with a 1,400 gallon per minute (gpm) vertical
turbine pump, 250 hp motor, with a total dynamic head (TDH) of 468 feet. Construction of a new well house with associated valving and piping. Installation of the Hole in the Rock Backup
Well Chlorinator (identified as TP003 in the Division’s database) is included in the wellhouse design and will be housed in a separate chlorine treatment room.
We have received the following information for Hole in the Rock Backup Well (WS008), Hole in the Rock Backup Well Chlorinator (TP003):
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/plans/specs
The plan review of the proposed Hole in the Rock Backup Well Chlorinator (TP003): has been completed according to the following:
The proposed Hole in the Rock Backup Well Chlorinator is a gas chlorinator, Model Evoqua / Wallace & Tiernan S10K Sonic Chlorinator, with a Model CR 1s-4 Grundfos chlorine booster pump.
This chlorinator will add chlorine to the water from Hole in the Rock Backup Well (WS008).
This chlorinator is intended to provide secondary disinfection in the distribution system where the chlorinated water will go to the distribution system directly.
The proposed gaseous chlorine for disinfection meets the ANSI/NSF 60 standard.
The proposed design target dose of 0.2 mg/L or ppm (measured as free chlorine) is based on a typical flow of 1,400 gallons per minute from Hole in the Rock Backup Well.
The chlorine dose will be adjusted by an automatic flow-paced control.
The Point of Entry (POE) sampling location will be at the Hole in the Rock Backup Well house.
We have completed our review of the plans and specifications, stamped, and signed by Jacob K. Nielsen, P. E., and dated June 18, 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 equipping Hole in the Rock Backup Well (WS008), Hole in the Rock Backup
Well Chlorinator (TP003)are hereby approved.
This approval pertains to construction only. An Operating Permit must be obtained from the Director before Hole in the Rock Backup Well (WS008), Hole in the Rock Backup Well Chlorinator
(TP003) 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.
If you have any questions regarding this approval, please contact Brent Arns, of this office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
BA/DK/LT/mrn/mdbEnclosures─ Well Approval Checklist; Operating Permit Checklistcc:Bryan Slade, Tooele County Health Department, [e-mail] Robinson, Oquirrh
Mountain Water System, [e-mail] Nielsen, Hansen, Allen & Luce, [e-mail] Treutel, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]
Hunter Payne, Division of Drinking Water, [e-mail]
Melissa Noble, P.G., Division of Drinking Water, [e-mail]
Chris Martin, P.E., Division of Drinking Water, [e-mail]
Brent Arns, Division of Drinking Water, [e-mail] 23076 15783 HITR2 Well Equip PADivision 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, where appropriate [For example, water quality data showing MCL compliance; raw and finished water data that demonstrate satisfactory performance of the new
treatment facility.]☐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 will be identified in the Division’s database. The location is located within 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 (EP003) when the chlorinator is operating. [R309-215-10(1)]Our records show
that your water system serves 2,020 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 elective 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)]