DDW-2024-012100

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144830 • Salt Lake City, UT 84114-4830
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper.
State of Utah

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF DRINKING WATER
Nathan Lunstad, PhD, P.E.
Director

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor

August 28, 2024

Via Email: [e-mail]
Andy Garland
Mountain Regional Water Special Service District
P.O. Box 982320
Park City, Utah 84098

Subject: 2024 System-Specific Minimum Sizing Standards—Final Determination
Mountain Regional Water Special Service District, System #22137, File #11517

Dear Andy Garland:

DETERMINATIONS

Based on the findings set forth below, the Division of Drinking Water (the Division) hereby
establishes the following system-specific minimum sizing standards for Mountain Regional Water
Special Service District (the System):

Peak Day Source Demand (gallons/day/ERC) – 1,384
Average Annual Demand (gallons/year/ERC) – 184,808
Equalization Storage (gallons/ERC) – 506
Fire Storage (gallons) – 2,842,000

Introduction

Pursuant to Utah Code Section 19-4-114, the Director of the Division (Director) is required to
establish system-specific minimum sizing standards based on, among other factors, water use data
submitted to the Division of Water Rights (DWRi). The Director’s determinations may also be based
on engineering analyses and other evidence if this is available. This final determination letter is
addressed to you in your capacity as the Administrative Contact for the System. The Director has
delegated the responsibility for making system-specific minimum sizing standards under Utah Code
Section 19-4-114 to the Engineering Manager for the Division.

Prior to issuing this final determination letter, the Division analyzed applicable DWRi water use data
and sent a draft summary of the Division’s proposed 2024 system-specific minimum sizing standards
to the System on July 9, 2024. The System provided comments on July 30, 2024, and worked with the
Andy Garland
Page 2 of 4
August 28, 2024

Division and DWRi to update applicable data which was completed on August 26, 2024. The Division
has taken these comments into account in reaching this final determination of the system-specific
minimum sizing standards for the System. A summary of the water use data and calculations the
Division used to make these determinations is attached as part of the administrative record.

Water Use Data Definitions

As used in this Final Determination, the following terms have the following meanings:
Peak Day Source Demand is the total flow into a public water system to meet the demand of the water
system on the day of the highest water consumption in a calendar year.

Average Annual Demand is the total quantity of drinking water flowing into a public water system
within a calendar year.

Total Equivalent Residential Connections (ERCs) term represents the number of residential service
connections and the number of equivalent residential connections for non-residential connections
(commercial, industrial, institutional connections).

Minimum Equalization Storage requirement is a volume that is equivalent to the amount of water
needed to meet the average day culinary demand for public water systems. Equalized storage per ERC
is calculated by dividing the Average Annual Demand per ERC data by the number of operational
days in a year.

Water System Background Facts

Mountain Regional Water Special Service District is a community water system serving a population
of approximately 9,500 and 6,783 ERCs.
System-Specific Minimum Sizing Standards—Background
Under Utah Code Section 19-4-114, the legislature required that the Director establish minimum
sizing standards on a system-specific basis instead of statewide, as the Division has done in the past.
System-specific determinations need to be based on system-specific information. The code allows the
Director to rely on water use data submitted to DWRi. Alternatively, a community water system may
perform and submit an engineering study to the Division if the water system’s water use data is not
representative of future use or the water system does not yet have actual water use data. In this matter,
actual water use data was available through DWRi, and an engineering study was not submitted to the
Division for review. Therefore, the Division has relied upon DWRi information and other relevant
data.

Additional System-Specific Basis for Determinations

The Division established Fire Storage requirements based on information provided from the System
on August 21, 2024.

The System requested the Division to use a variability factor for the Peak Day Demand of 20%.

Andy Garland
Page 3 of 4
August 28, 2024

Storage Capacity

Based on the System’s storage facilities and the storage minimum sizing requirement established in
this letter, the Director hereby determines that the System is compliant with the minimum storage
capacity requirements.

Source Capacity

The Division has adequate documentation of the established safe yields for all wells, capacity of the
Signal Hill Filter Plant and the maximum daily purchase rate from the consecutive connection with
Summit Water Distribution Company. Using total system-wide source capacities and the source
minimum sizing requirement established in this letter indicates that the System is compliant with
minimum source capacity requirements.

Effective Date

The determinations made in this letter are effective immediately and will become final 30 days from
the date of this letter unless the System files a contest as provided below.

Notice of Right to Contest

The Director has determined this determination made under Section 19-3-114 qualifies as a “permit
order” within the meaning of Utah Code Section 19-1-301.5(1)(f). See Utah Code § 19-1-301.5(1)(e)
(defining “permit” to include a “plan” or “other administrative authorization”).

The System may contest any determinations made herein by delivering a notice of contest to the
Director. The notice of contest must be in writing and must be delivered to the Director on or before
30 days after the date this letter is signed. There is no particular form for the notice of contest, but it
must include the System’s reasons and rationale for the contest. The Director’s address for purposes of
submitting a notice of contest is as follows:

U.S. Mail

Division of Drinking Water
Attention: Director
P.O. Box 144830
Salt Lake City, UT 84114-4830

Email

A notice of contest may be submitted to the Director by email, provided, however, that the
Director confirms receipt of the email. The Director’s email address is: [e-mail].
The email submission must be received by the Director before the expiration of the contest
deadline.

If the System files a timely notice of contest, the Director will evaluate the matter and attempt to
resolve the matter through negotiations. If the Director is not able to resolve the matter, the Director
Andy Garland
Page 4 of 4
August 28, 2024

will issue a final agency action regarding the contest. At that point in the process, the System shall
have the right to seek further internal agency and judicial review pursuant to Utah Admin. Code R305-
7 and Utah Code Section 19-1-301.5.

Right to Request Reconsideration

The Director plans to evaluate the determinations made herein every three years. However, this
requirement is not mandatory. At any time, a water system whose system-specific minimum sizing
standards have been established by the Division under Section 19-4-114 may request reconsideration
of the Director’s determinations by submitting a written request. A request for reconsideration shall be
submitted to the Director in the same manner as a notice of contest provided above.

Conclusion

If the System management has any questions regarding this letter, please contact Julie Cobleigh, of
this office, at [phone], or me at [phone].

Sincerely,

Michael Newberry, P.E.
Permitting and Engineering Support Manager

JJC/mrn/mdb

Enclosures
1. Utah Department of Environmental Quality Division of Drinking Water Minimum Sizing Standards
Summary Report

cc: Nathan Brooks, Summit County Health Department, [e-mail]
Andy Garland, Mountain Regional Water SSD, [e-mail]
Sam Grenlie, P.E., Mountain Regional Water SSD, [e-mail]
Jessican DiCaprio, Mountain Regional Water SSD, [e-mail]
Julie Cobleigh, P.E., Division of Drinking Water, [e-mail]
Hunter Payne, Division of Drinking Water, [e-mail]
Mike Owens, Park City Fire Department, [e-mail]
Ted Black, Office of the State Fire Marshal, [e-mail]

DDW-2024-010393

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Date Standard Effective: Mon Aug 26 10:03:25 MDT 2024
Peak Day Source Demand per ERC (gal/day): 1,385
Average Annual Demand per ERC (gal/year): 184,809
Equalization Storage per ERC (gal/day): 507
MOUNTAIN REGIONAL WATER SSD PWS ID: UTAH22137
Admin Name: ANDY GARLAND
Address:
City, State, Zip: Park City, UT 84098
Phone: [phone]
Email: [e-mail]
System Type: Community
Population: 9,500
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS VARIABILITY
Data from these reporting years: 2021, 2022, 2023
Peak Day Source Demand per ERC (gal/day): 1,154
Average Annual Demand per ERC (gal/year): 137,917
Equalization Storage per ERC (gal): 378
x
x
x
(1 + 0.2)
(1 + 0.34)
(1 + 0.34)
=
=
=
1,384
184,808
506
DWRi WATER USE DATA REPORTED
6421 N Business Park Loop Rd Suite A
Equalization per ERC (gal): 507
Existing Storage (gal): 12,297,512
ERCs: 6,783
Required Storage w/o Fire Flow: 3,438,981
Required Fire Storage (gal): 2,842,000
Required Storage w/Fire (gal): 6,280,981
Storage Deficiency: 0
Storage Deficiency (%): 0.0
No Storage Deficiency
Peak Day Source Demand per ERC (gpm): 0.96
Existing Source Capacity (gpm): 6,679
ERCs: 6,783
Required Source Capacity (gpm): 6,512
Source Deficiency: 0
Source Deficiency (%): 0
No Source Deficiency
Year Peak
Day
Source
Demand
(gal/day)
Average
Annual
Demand
(gallons)
ERCs Peak
Demand
per ERC
(gal/day)
Avg
Annual
Demand
per ERC
(gal/year)
Equaliza
tion
Storage
per ERC
(gal/day)
OP
Days
2023 5,764,304 942,566,378.13 6,783 850 103,074 282 365
2022 5,177,772 910,183,305.75 6,110 847 105,609 289 365
2021 5,829,474 1,083,070,070.82 5,053 1,154 137,917 378 365
Variability:0.342 0.2 0.34 0.34
Year Peak Month Average
(gal/day)
Peak Month Average
per ERD (gal/day)
Ratio of PD/ERC to
Peak Month Avg/ERC
2023 4,060,629 599 1.42
2022 3,689,369 604 1.4
2021 4,102,569 812 1.42
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
HD001 SUMMIT BOOSTER HYDRO
ST002 SUMMIT PARK TANK 2 100,000
ST003 SUMMIT PARK TANK 3 700,000
ST004 TIMBERLINE TANK 120,000
ST006 BLACKHAWK TANK 350,000
ST007 GLENWILD TANK 650,000
ST008 RED HAWK TANK 400,000
ST009 ATKINSON TANK 700,000
ST010 SPORTS PARK TANK 1,000,000
ST011 BEAR HOLLOW TANK 160,000
ST012 SPRING TANK 500,000
ST013 MCDONALD DRAW TANK 250,000
ST014 WHITE PINE TANK 500,000
ST015 DUTCH DRAW TANK 250,000
ST016 SNOWSLIDE TANK 1,000,000
ST017 WEST HILLS TANK 800,000
ST018 SIGNAL HILL TANK 447,512
ST019 PRESERVE TANK 350,000
ST020 MIDDLE VALLEY TANK 1,050,000
ST021 STAGECOACH TANK NORTH 100,000
ST022 STAGECOACH TANK SOUTH 80,000
ST023 SILVER CREEK TANK 2,000,000
ST024 COLONY PHASE 5 TANK 300,000
ST026 CANYONS TANK 1 240,000
ST027 SUMMIT PARK TANK 1 - RPL 250,000
Storage Totals: 12,297,512 GAL
Source ID Source Name Flow Rate (GPM)
WS001 ATKINSON WELL 2 800
WS002 JAILHOUSE WELL 3 120
WS003 SILVER CREEK WELL 10 300
WS004 STAR POINTE WELL 15B N/A (The safe yield is 817 gpm; however,
15B and 15C cannot operate simultaneously therefore only 15C will be counted for capacity purposes.)
WS005 3 MILE WELL 115
WS008 BLACKHAWK WELL 2R 100
WS009 GORGOZA WELL 6 472
WS010 NUGGETT WELL 350
WS013 LAKE WELL 1 220
WS014 SUN PEAK WELL 2 67
WS015 SUN PEAK WELL 3 99
WS016 SUMMIT PARK WELL 2 48
WS018 SUMMIT PARK WELL 5 120
WS019 SUMMIT PARK WELL 7 230
WS024 BISON BLUFFS WELL 15C 1,000
WS025 ROCKPORT RESERVOIR INTAKE/ TP002 2,083.32
WS027 TANK WELL NO. 16 39.3
WS029 UTAH22059 SWDC 400
WS030 WAGON TRAIL#2 WELL 16
WS031 GULCH NO 1 WELL 100
Source Totals: 6,679 GPM