DDW-2024-012625

October 28, 2024
Zachary Renstrom, Manager
Washington County Water Conservancy District
Washington County WCD – Cottam
533 East Waterworks Drive
St. George, Utah 84770
Subject:Plan Approval, Well Equipping, Cottam Well #3 and Cottam Well #3 Chlorinator (WS006, TP004); Washington County WCD – Cottam, System #27071, File #12871
Dear Zachary Renstrom:The Division of Drinking Water (the Division) received the plans and specifications for the Cottam #3 Well Equipping including the Cottam Well #3 Chlorinator from
Russ Vernon, Alpha Engineering, on August 22, 2024. The Division issued Plan Approval for drilling Cottam Well #3 on January 28, 2022. Plan review comments were sent to you and your
consultant for the well equipping and chlorinator portion of the project on September 19, 2024. The Division received revised plans and a response to the comments on September 24, 2024.

Our understanding of the project is to equip Cottam Well #3 with a 125-horsepower vertical turbine pump that can deliver 1,000 gallons per minute (gpm) of water at 286 feet of head.
The well and pump will be housed in a new well house that has all the required discharge piping and valves. Included as part of the discharge piping will be a sand separator with auto
flush. The project also includes 1,000 linear feet of 10-inch PVC C900 DR 18 pipe as transmission pipe to connect to the existing transmission pipe and to deliver water to the tanks.
A chlorinator is part of this project and includes the following sections and addenda describing the Cottam Well #3 Chlorinator (TP004):

1.Project Summary for Cottam Well #3 Chlorinator (TP004)    
2. Plan Approval Cottam Well #3 (WS006) and Cottam Well #3 Chlorinator (TP004) 
3.FutureMonitoring and Reporting Requirements (Addendum 1)Project Summary for Cottam Well #3 Chlorinator
The plan review of the proposed Cottam Well #3 Chlorinator (TP004)has been completed according to the following:
The proposed Cottam Well #3 Chlorinator (TP004) will be a Regal gas chlorinator automatic flow-paced Regal smart valve proportioning system with ECS 400 series scale, and a 216-vacuum
regulator 
This chlorinator will add chlorine to the water from Cottam Well #3 (WS006).
This chlorinator is intended to provide secondary disinfection in the distribution system. The water system is already chlorinating both of its active water sources (WS002 and WS003).

The chlorinated water will go directly to the Cottam Storage Tank (ST001) and Cottam 3MG Tank (ST002).
The gas chlorine being used for disinfection meets the ANSI/NSF 60 standard.
The chlorinator is designed to provide a dose of 3.0 mg/l (ppm) based on design flow of 1,000 gallons per minute (gpm) from Cottam Well #3.
The chlorine dose will be adjusted by a manually adjusted rotometer set for the constant flow from Cottam Well #3.
The Point of Entry (POE) sampling location will be in the Cottam Well #2B (TP003) chlorinator building and is a Hach continuous chlorine analyzer and takes samples after the system’s
two tanks (ST001 and ST002). This location is already identified as EP002 in the Division’s database.
We have received the following information for equipping Cottam Well #3 (WS006) and the Cottam Well #3 Chlorinator (TP004):
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
Well head discharge piping.
Well house design
Chlorinator design
We have completed our review of the plans and specifications, stamped, and signed by Todd Brent Gardner, P. E., and dated October 22, 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 the Cottam Well #3 and the Cottam Well #3 Chlorinatorare hereby
approved.
This approval pertains to construction only. An Operating Permit must be obtained from the Director before Cottam #3 and the Cottam Well #3 Chlorinator 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.
Secondary Disinfection Requirements
The Washington County WCD - Cottam water systemis not required to disinfect. The water system proposes to voluntarily install the Cottam Well #3 Chlorinator (TP004) to provide a detectable
disinfectant residual in the distribution system for secondary disinfection.
The plan review of the proposed Cottam Well #3 Chlorinator (TP004) is based on providing secondary disinfection. When this chlorinator is installed and placed in operation after the
Operating Permit issuance, the Washington County WCD - Cottam will continue to be required to demonstrate ongoing compliance with the secondary disinfection requirements that are outlined
in Addendum 1 to this letter.
The Division shall be informed by telephone within 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 Cottam Well #3 (WS006) or any of the other water system’s sources are found to require additional disinfection 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.
New Source Chemistry
Please note that the initial chemical analysis found aluminum above the secondary maximum contaminant level of 0.2 mg/L. Water with aluminum concentrations above 0.2mg/L may result in
discolored water customer complaints.
If you have any questions regarding this approval, please contact J. Paul Wright, P.E., DEQ Southwest District office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
JPW/mrn/mdbEnclosures─ Well Approval ChecklistOperating Permit Checklist Addendum 1- Future Monitoring and Reporting Requirementscc:Jeremy Roberts, Southwest Utah Public Health Dept.,
[e-mail] Gardner, P.E., Alpha Engineering, [e-mail] Vernon, P.E., Alpha Engineering, [e-mail] Renstrom, Washington
County WCD, [e-mail] Stout, Washington County WCD, [e-mail]. Paul Wright, P.E., DEQ Southwest District Engineer, [e-mail]
David Kruse, Division of Drinking Water, [e-mail] 27071 12871 WS006 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.)
☐Well head 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
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 will be identified during the plan approval process. 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 (EP002). [R309-215-10(1)]Our records show that your water system serves
120 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)]