DDW-2024-009176

July 25, 2024
Jeff Burgess
Kolob Heights Water Users Association
1125 North Hovi Hills Drive
Cedar City, Utah 84721
Subject:Operating Permit, Kolob Heights Subdivision, System #27111
File #12585 - Kolob Heights Distribution System (DS001) and Kolob Heights Booster Station (PF001);
File # 12586 - Culinary Well (WS001) and Kolob Heights Well Chlorinator (TP001);
File #13095 - 250K Concrete Tank (ST001)
Dear Jeff Burgess:The Division of Drinking Water (the Division) received your request for an Operating Permit for the Kolob Heights Subdivision Water System including the distribution
system (DS001), Kolob Heights Booster Station (PF001, Culinary Well (WS001), Kolob Heights Well Chlorinator (TP001), and 250K Concrete Tank (ST001) from Curtis Nielson, P.E., Ensign
Engineering, on May 22, 2024. As a follow-up to that letter, because ownership and operation of the water system will be transferred to the Washington County Water Conservancy District,
coordination took place and was confirmed on June 20, 2024. Confirmation of submission of the final source protection zone delineation to Washington County for coverage under the county’s
source protection ordinance was received on July 19, 2024. J. Paul Wright, P.E., DEQ Southwest District Engineer conducted an onsite construction inspection of this project on April
4, 2024.Our understanding of the project is a new Public Drinking Water System known as the Kolob Heights Subdivision that will provide water to a total of 20 lots. The original approval
included 26 lots, but the six lots in the Carter Subdivision located south of Kolob Heights were not constructed at this time. As mentioned above, once an operating permit has been issued
and the county has issued final approval, ownership and operating of the water system will be transferred to the Washington County Water Conservancy District. Below is a description
of the project history and final construction of each facility in the water system.File #12585 - Kolob Heights Distribution System (DS001) and Kolob Heights Booster Station (PF001)The
Division received the plans and specifications on November 9, 2022. Initial review comments and a request for more information were sent to your consultant on November 9, 2022. Water
modeling results were received by the Division on December 1, 2022. Additional plan review comments were sent to you and your consultants on December 15, 2022. Final revised plans were
received by the Division on February 1, 2023, with verification of fire flows from the local fire authority. There were still questions about the sizing of the booster station for operating
purposes and those comments were given verbally to your consultant on February 16, 2023. Final booster station sizing was received by the Division on February 22, 2023. A hydraulic
model report was submitted and showed that all required pressures were able to be met. Plan approval was issued by the Division on February 28, 2023.The distribution system and water
lines consist of 4,280 linear feet of 8-inch diameter PVC C900 transmission line from the well to the tank (ST001); 5,220 linear feet of 8-inch diameter PVC C900 distribution pipe in
the Kolob Heights subdivision serving 20 lots; a pressure reducing valve (PRV) station to reduce pressure in the lower part of the system; and all fire hydrants, valves, and all other
related fittings and appurtenances. The booster station will be used to provide adequate operating pressures and peak flows throughout the water system and for fire flows. A new building
was constructed and currently contains two Grundfos vertical centrifugal pumps, 2.5 horsepower each, with the capacity to provide a peak instantaneous flow of 98 gallons per minute (gpm)
at 150 feet of head. A third 2.5 hp pump will be installed as part of the agreement with the Washington County Water Conservancy District, adding another 49-gpm capacity and for redundancy.
A variable frequency drive (VFD) is used to allow for variable flow scenarios. The booster station also includes one 1,500 gpm pump to provide the required fire flow and has also been
equipped with a VFD and can be used if larger operational flows are needed.File #12586 - Culinary Well (WS001) and Kolob Heights Well Chlorinator (TP001)The Division received the plans
and specifications for Culinary Well equipping and Chlorinator on November 11, 2022, along with the plans for other parts of the water system. At the time, the plans weren’t complete,
with all of the required submittals and comments being sent to you and your consultant on the same day requesting that information. The revised plans with most of the information was
received by the Division on June 12, 2023. Plan review comments and a request for the remainder of the new source chemistry (radiologicals) was sent to you and your consultant on June
15, 2023. Final plans for the well equipping were received by the Division on August 10, 2023, with a confirmation of radiologicals also having been received at that time. The Division
issued plan approval for drilling the Culinary Well (WS001) on June 26, 2021, and plan approval to equip the well and for the chlorinator on September 7, 2023.Culinary Well (WS001) was
equipped with a Grundfos submersible pump that pumps 55 gallons per minute (gpm). The project also included a well house with all of the required discharge piping and valves. The Kolob
Heights Chlorinator (TP001) has been completed according to the following:The Kolob Heights Chlorinator is a Regal gas chlorinator, with automatic switchover.The Regal gas chlorinator
adds chlorine to the water from the Culinary Well (WS001).The chlorinator will provide elective secondary disinfection. Chlorinated water is conveyed to the 250 K Concrete Storage Tank
(ST001) at which point it will be conveyed through the Kolob Heights Booster Station (PF001) and then to the distribution system.Chlorine gas for disinfection meets the ANSI/NSF 60 standard.The
design target dose of 2.0 mg/L or ppm (measured as free chlorine) is based on a typical flow of 55 gallons per minute (gpm) from the Culinary Well.The chlorine dose will be adjusted
manually based on the constant rate flow of 55 gpm from the well.The Point of Entry (POE) sampling location is at a sample tap in the Kolob Heights Booster Station Building (PF001),
located right after the storage tank and prior to the first customer on the system. File #13095 - 250K Concrete Tank (ST001)The Division received the plans and specifications for 250K
Concrete Tank on August 8, 2022. Written review comments were provided to you and your consultant on August 17, 2022. The Division received the revised plans and specifications on September
13, 2022. Plan approval was issued by the Division on September 19, 2022.Our understanding of the project was the construction of a new 250,000-gallon reinforced concrete tank to provide
equalizations and fire storage for the proposed Kolob Heights subdivision in Washington County. This tank has all of the necessary appurtenances including a tank access hatch, overflow,
drain, air vents, inlet and outlet piping. It is known as the 250K Concrete Tank and identified as ST001 in the Division’s database.Operating Permit
We have received the following information for the Kolob Heights Subdivision Water System including the distribution system (DS001), Kolob Heights Booster Station (PF001, Culinary Well
(WS001), Kolob Heights Well Chlorinator (TP001), and 250K Concrete Tank (ST001):
Design engineer’s statement of conformance with approval conditions and changes made during construction were in conformance with rules R309-500 through 550. Changes made involved a
different pump configuration in the Kolob Heights Booster Station (PF001) due to availability of power and the elimination of the Carter Subdivision portion of the distribution system.
Documentation of valid water rights.
Evidence of O&M manual delivery.
As-built or record drawings.
Documentation that the requirements for coverage under the Washington /County source protection ordinance have been met.
Satisfactory bacteriological results as evidence of proper disinfection and flushing.
We have determined that all conditions of operating permit issuance have been met. On this basis, an Operating Permit forthe Kolob Heights Subdivision Water System including the distribution
system (DS001), Kolob Heights Booster Station (PF001, Culinary Well (WS001), Kolob Heights Well Chlorinator (TP001), and 250K Concrete Tank (ST001)is hereby issued as constituted by
this letter. You may now place these facilitiesin 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 Culinary Well (WS001) is 55 gallons per minute (gpm). The safe yield of Culinary Well is rated at 53 gpm, which is calculated based on two-thirds of
the constant-rate aquifer drawdown test results at 80 gpm. The safe yield of 53 gpm is the basis for determining the maximum number of connections that Culinary Well can serve.
Secondary Disinfection Requirements
The Kolob Heights Subdivision Water System is a new proposed Public Water System andis not required to disinfect the Culinary Well (WS001) based on bacteriological source sample results
currently available. The water system has installed the Kolob Heights Well Chlorinator (TP001) to provide a detectable disinfectant residual in the distribution system for secondary
disinfection.
The Kolob Heights Subdivision Water System, once it has at least eight connections and is regulated as a Public Water System, will be required to demonstrate ongoing compliance with
the secondary disinfection requirements detailed in Addendum 1.
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 the Culinary Well (WS001) 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.
Drinking Water Source Protection Requirement
.
The Division received proof that a map of the final source protection zones was provided to Washington County to be covered under the Washington County Source Protection Ordinance on
July 18, 2024. All source protection requirements have been fulfilled for the Culinary Well. Concurrence of the final DWSP plan will be addressed under separate cover.
If you have any questions regarding this Operating Permit, please contact J. Paul Wright, DEQ Southwest District Engineer, of this office, at [phone], or Michael Newberry, Permitting
and Engineering Manager, at [phone].
Sincerely,
Russell Seeley, P.E.
Assistant Director
JPW/DLB/mrn/mdbcc: Jeremy Roberts, Southwest Utah Public Health Department, [e-mail]. Paul Wright, P.E., DEQ Southwest District Office, [e-mail] Nielson,
P.E., Ensign Engineering, [e-mail]
Tim Watson, Watson Engineering, [e-mail]
Jeff Burgess, Kolob Heights Water Users Association, [e-mail]
Whit Bundy, Washington County Water Conservancy District, [e-mail]
Todd Edwards, Washington County, [e-mail]
Sitara Federico, Division of Drinking Water, [e-mail]
Luke Treutel, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]
Deidre Beck, P.G., Division of Drinking Water, [e-mail]
Jennifer Yee, Division of Drinking Water, [e-mail] 27111 12585 12586 13095 OP
Addendum 1 
Elective Monitoring and Reporting Requirements 
The following requirements, included in this Addendum, will become active once the water system reaches a threshold (a minimum of 8 connections) to be regulated as a Public Water System
Chlorine Monitoring & Reporting Requirements
The water system will be required to meet elective disinfection requirements. As a part of these requirements, the water system will be 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 EP001 in the Division’s database. This location has been identified as Kolob Heights Booster Pump Station Building. 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. [R309-210- 8(3)(a)(ii)]
Our records show that your water system will serve approximately 75 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 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)]
Disinfection Byproducts Monitoring & Reporting Requirements
In addition to the chlorine monitoring and reporting described above, the system will be required to monitor disinfection byproducts as a result of introducing disinfection to the system.
According to our records, the water system will serve a population of approximately 75 people and serves groundwater from the system’s source. Based on this information, the water system
will be required to collect samples from two (2) Disinfection Byproduct (DBP) sampling sites per year. Each disinfection byproduct sample should be a paired sample of Total Trihalomethanes
(TTHM) and Haloacetic Acids (HAA5).
Water system staff will need to select two (2) sites to be sampled for DBPs. A sampling site plan template has been enclosed with this letter and will need to be completed as part of
this process. Please fill out the sampling site addresses, and include a simple map or schematic of the distribution system and where each of these sites is located. You will need to
include the following information:
A site at a maximum retention location in the distribution system, to be labeled MR001
A site at a midpoint (average retention location) in the distribution system, to be labeled MD001.
A schematic of the distribution system with a location for each proposed sampling site
A justification for the selection of the two proposed sites
This form is due back to the Division within 30 days from the date when the water system reaches the threshold to become a PWS .When the form is complete, please sign and email it to
Luke Treutel at [e-mail]. If you have any questions about selecting DBP sampling sites, please contact Luke Treutel at [phone].