DDW-2025-005806

June 27, 2025
Sent via Email Only
Garry Heinze
Arches National Park Headquarters
2282 Southwest Resource Boulevard
Arches National Park
Moab, Utah 84532
[e-mail]
Subject:Plan Approval, Nitrate Ion Exchange Filter Addition to Water Softener/Post-Filter/Pre-Cl Water Treatment Plant (TP002);
Arches National Park HQ, System #10021, File #22382
Dear Garry Heinze:The Division of Drinking Water (the Division) received the plans and specifications for adding nitrate ion exchange filters to the Water Softener/Post-Filter/Pre-Cl
Water Treatment Plant (TP002) from Christen Glime, P.E. and Brad Larsen, P.E. on June 9, 2025. Written review comments were provided on June 24, 2025. The Division received the revised
plans and specifications on June 25, 2025.
Our understanding of the project is adding ion exchange filters to the Water Softener/Post-Filter/Pre-Cl Water Treatment Plant (TP002). The ion exchange resin selected is the Purolite
A520E to target nitrate removal. This also consists of building an evaporation basin to contain the backwash water. Detailed project description and the Division’s decision to issue
Plan Approval for the ion exchange addition to the Water Softener/Post-Filter/Pre-Cl treatment plant are summarized in the Project Overview Addendum.
We have completed our review of the plans and specifications of the proposed nitrate ion exchange filter addition to the Water Softener/Post-Filter/Pre-Cl Water Treatment Plant (TP002),
stamped and signed by Bradley Larsen, P. E., and dated June 25, 2025, 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 construction of nitrate ion exchange filter addition to the Water Softener/Post-Filter/Pre-ClWater Treatment Plant (TP002) are hereby approved.
This plan approval pertains to construction only. An Operating Permit must be obtained from the Director before the ion exchange filters may be put into service. A checklist outlining
the items required for issuing an Operating Permit for this treatment plant is enclosed for your information.Approvals or permits by 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 Dani Zebelean, P.E., of this office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
DZ/mrn/mdbEnclosuresOperating Permit ChecklistAddendum 1 – Project OverviewAddendum 2 - Future Monitoring and Reporting Requirementscc:Jeremy Roberts, Southwest Utah Public Health Department,
[e-mail] Page, P.E., DEQ Southwest District, [e-mail] Glime, National Park Service, [e-mail] Larsen, National Park Service, [e-mail]
Swenson, National Park Service, [e-mail] Tate, National Park Service, [e-mail] Heinze, National Park Service, [e-mail] Heinze, National
Park Service, [e-mail]
Dani Zebelean, P.E., Division of Drinking Water, [e-mail]
Nathan Lunstad, P.E., Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]
Dylan Martinez, Division of Drinking Water, [e-mail]
DZebelean 10021 22382 PA TP002 Ion Exchange Addition
Utah Division of Drinking Water ― Checklist for Issuing Operating PermitsWater System Name:Arches National ParkSystem Number: 10021Project Description: Adding IX to TP002File Number:
22382
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).☐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 (e.g., every 1,200 feet, end-of-line, each branch)☐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 — two sets of pre and post treatment nitrate and BacT samples for a total of four nitrate and four BacT samples. Sample sets shall be collected at least two weeks
apart. The second set of samples shall be representative of at least two weeks of treatment plant operation. ☐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 sourceADDENDUM 1 Project Overview
Arches National Park HQ Water System (UTAH#10021)
Water Softener/Post-Filter/Pre-Cl Water Treatment Plant (TP002)
Our understanding of the project is that the proposed nitrate ion exchange filter addition to the Water Softener/Post-Filter/Pre-Cl treatment plant will treat the Well #1 (WS001). The
Water Softener/Post-Filter/Pre-Cl treatment plant (TP002) was permitted after-fact in August of 2021 under Plan Review File #12073. The Water Softener/Post-Filter/Pre-Cl treatment plant
(TP002) currently has cartridge filters, a water softener, and is then treated by the Headquarters Chlorinator (TP001). The Headquarters Chlorinator (TP001) is a liquid hypochlorite
chlorinator. The two treatment plants currently treat the Well #1 (WS001) to provide water to the distribution system at the Arches Headquarters area of the Arches National Park.

Starting in 2020, the Well #1 (WS001) was required to monitor quarterly for nitrate due to rising levels in the well. Recent samples indicate the well is close to the maximum contaminant
level (MCL) of 10 mg/L of nitrate. Nitrate is an acute contaminant and high levels of the contaminant can decrease the oxygen carrying capacity of hemoglobin. Most notably leading to
Blue Baby Syndrome.
The ion exchange resin, Purolite A520E, was selected based on an online calculator from Ecolab. All the sizing was also based on the online calculator. The new ion exchange filters will
be downstream of the existing cartridge and water softener. This project also involves the construction of an evaporation basin for the backwash water. The proposed ion exchange filters
being added to the Water Softener/Post-Filter/Pre-Clwater treatment plant will add a media absorption process. The proposed ion exchange filters have a design capacity of 30gallons per
minute (gpm). The design includes 2train(s) of media absorption process, and each train of 30 gpm. Thetreatment plant consists of the following processes in sequence:One-stage pre-filter
– Cartridge Filters, GTCHB-Series Multi cartridge, as a pre-filter;
First-stage media absorption water softening – Culligan Brand;
Second-stage media adsorption ion exchange – Pentair Brand or equivalent, reinforced fiberglass pressure vessel, 24-inches diameter and 72-inches tall. The resin used will be the Purolite
A520E. The pressure vessel and ion exchange resin will be NSF/ANSI 61 certified;Post-chlorination – liquid sodium hypochlorite injection.
Addendum 2
Future Monitoring and Reporting Requirements
Source Chemical Monitoring Requirements
Upon this issuance of an operating permit Arches National Park HQ (the system) will be required to collect one monthly nitrate sample from the Water Softener/Post-Filter/Pre-Cl Water
Treatment Plant (TP002) each month that the facility supplies water to the distribution system. This requirement will last for a minimum of six operating months, After six months, if
all results are less than the nitrate Maximum Contaminant Level (MCL) of 10mg/L the facility will qualify for a reduced monitoring schedule in which one nitrate sample will be required
in each calendar quarter. Please contact David Kruse at [e-mail] or 385-566-7789 to request this reduction or with any questions related to this system's source chemical monitoring
requirements. Lead and Copper MonitoringThis new treatment has the potential to alter the water chemistry and cause release of lead or copper. As a result, the system’s lead and copper
monitoring requirements will change. The system will be required to collect 10 lead and copper samples every six months. If you have any questions about lead and copper sampling, please
contact the Division Lead and Copper Rule Manager, Dylan Martinez, at [phone] or [e-mail] with new requirementsAnalyte(s) Required# Of samplesSampling FrequencyNext
Due DateRule ReferenceDS001 Lead & Copper10Every Six Months (for one year)TBDR309-210-6(3)(d)(iv)(G)