DDW-2024-010304

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]
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF DRINKING WATER
Tim Davis
Director
November 16, 2021
Mike Folkman
Summit Water Distribution Company
8506 Bluebird Lane
Park City, Utah 84098
Subject: System-Specific Minimum Sizing Standards
Summit Water Distribution Company, System #22059, File #11516
Dear Mike Folkman:
Based on the water use data submitted to the Division of Water Rights (DWRi), the following
system-specific minimum sizing standards have been set for Summit Water Distribution
Company water system:
Peak Day Source Demand (gal/day/ERC) – 887 gal/day/ERC
Average Annual Demand (gal/yr/ERC) – 181,560 gal/yr/ERC
Equalization Storage (gal/ERC) – 497 gal/ERC
Fire Storage (gal) – 2,205,000 gal
These standards are effective as of the date of this letter. A summary of the water use data and
calculations used to set the minimum sizing standards is attached for your reference. The
Division plans to evaluate these standards every 3 years, or upon request.
Water System Background
Summit Water Distribution Company (the System) is a public water system in Summit County
that operates the following drinking water facilities ranging from new construction to 40-year-
old infrastructure:
Eleven (11) storage tanks with a combined volume of 6-million gallons of storage
One (1) spring
Nine (9) active groundwater wells
Eight (8) lift stations
Purchases water from Weber Basin through Mountain Regional Special Service District
Mike Folkman
Page 2 of 3
November 16, 2021
The System is a shareholder owned company that provides drinking water throughout its district
in addition to Park City Mountain Resort for snowmaking, emergency water for two other water
systems and whole sales water to a third system.
Minimum Sizing Standard Background
Per Utah Code 19-4-114, the information needed for the Division of Drinking Water (the
Division) to set system-specific minimum sizing standards may be based on water use data
submitted to the DWRi, or alternatively, a community water system can 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.
Actual water use data was available through DWRi. Therefore, the Division analyzed the
submitted DWRi water use data and sent a draft summary of the resulting system-specific
minimum sizing standards to your office on October 6, 2021. The Division allowed for 30 days
for your water system to review the draft system-specific minimum sizing. Your office replied
on October 7, 2021 to verify the draft sizing standards are representative. Therefore, the Division
is setting system-specific minimum sizing standard for Summit Water Distribution Company
water system.
Water Use Data Definitions
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 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.
Fire Storage was set based on information from Park City First District on April 13, 2020 of 1,000
gallons per minute for 120 minutes. On October 6, 2021, you provided the Division with the total storage
your water system maintains for fire of 2,205,000 gallons.
Storage Capacity
Based on your systems storage facilities and the storage minimum sizing requirement established in this
letter, your system is compliant with the minimum storage capacity requirements.
Mike Folkman
Page 3 of 3
November 16, 2021
Source Capacity
The Division has documentation of established safe yields for all your system sources. Using
total system wide safe yields and the source minimum sizing requirement established in this
letter indicates your water system is compliant with minimum source capacity requirements.
If you have any questions regarding this letter, please contact Cheryl Parker, of this office, at
[phone], or Michael Newberry, Engineering Manager, at [phone].
Sincerely,
Michael Newberry, P.E.
Engineering Manager
CP/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]
Milk Folkman, Summit Water Distribution Company, [e-mail]
Julie Cobleigh, Division of Drinking Water, [e-mail]
Cheryl Parker, Division of Drinking Water, [e-mail]
Chief Mike Owens, Park City Fire Authority, [e-mail]
Coy Porter, Office of the State Fire Marshal, [e-mail]
DDW-2021-008862
Community
6,850
Phone: [phone]
Emergency Phone: [phone]
Date Standard effective
Peak Day Source Demand per ERC (gal/day)
Average Annual Demand per ERC (gal/year)
Equalization Storage per ERC (gal/day)
100.0%
0.0%
SOURCE CALCULATION
Peak Day Source Demand per ERC(gpm)0.62
Existing Source Capacity (gpm):4,475
ERCs:6,065
Required Source Capacity (gpm)3,734
Source Deficiency (gpm):0
No Source Deficiency
CAPACITY CALCULATIONS FOR SOURCES
ERCs:6,065
Required Storage w/o Fire Flow (gal)3,016,887
Required Fire Storage (gal):2,205,000
Required Storage w/ Fire (gal):5,221,887
Storage Deficiency:5,221,887
Storage Deficiency
CAPACITY CALCULATIONS FOR STORAGE
STORAGE CALCULATION
Equalization per ERC (gal):497
Existing Storage (gal):0
Mike Folkman System Type:
8506 Bluebird Ln Population:
Park City, U 84098
[e-mail]
MINIMUM SIZING STANDARD
11/4/2021
887
181,560
497
Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Summit Water Distribution Company PWS ID: UTAH22059
DWRi WATER USE DATA REPORTED
Data Year Peak Day
Source
Demand
(gal/day)
Average Annual
Demand
(gallons)
ERCs Op
Days
2020 4,726,567 988,648,227 6,065 365
2019 4,562,110 896,012,046 6,041 365
2018 4,256,084 1,023,383,943 6,213 365
Variability 3%
Data from these reporting years 2018 to 2020
Max Peak Day Source Demand per ERC (gal/day)779 x 14%=887
Max Average Annual Demand per ERC (gal/year)163,079 x 11%=181,560
Max Equalization Storage per ERC (gal/day)447 x 11%=497
ST009 RED PINE TANK 50,000 GAL WS001 NEW REST STOP WELL 800 GPM
ST010 RED HAWK TANK GAL WS003 JEREMY RANCH WELL #4 511 GPM
ST012 SPRING CREEK SPRINGS STORAGE 50,000 GAL WS005 WHITE PINE WELL 20 GPM
ST008 MOOSE HOLLOW TANK 200,000 GAL WS006 CHURCH WELL 95 GPM
ST001 LOWER HIDDEN COVE TANK 500,000 GAL WS007 STORAGE WELL 800 GPM
ST002 UPPER HIDDEN COVE TANK 500,000 GAL WS008 OLD F-7 WELL 185 GPM
ST003 PLAT 5 TANK 500,000 GAL WS009 U224 WELL 167 GPM
ST004 TOMBSTONE TANK 100,000 GAL WS012 NEW F-7 WELL 468 GPM
ST005 RANCH PLACE TANK 750,000 GAL WS010 UPPER SPRING CREEK 242 GPM
ST006 TRAILSIDE TANK GAL WS014 UTAH22137 1054 GPM
ST007 SECTION 27 TANK 750,000 GAL WS016 HI-UTE WELL REPL-1 133 GPM
Storage Totals GAL Source Totals:4,475 GPM
1,100,000
1,500,000
6,000,000
SYSTEM STORAGE AND SOURCE INVENTORY
SYSTEM STORAGE DETAILS SYSTEM SOURCE DETAILS
Equalization
Storage per
ERC
(gal/day)
779 162,278 445
14%11%11%
755 146,478 401
685 163,079 447
MINIMUM SIZING STANDARD CALCULATIONS Variability
Factor
Peak Demand
per ERC
(gal/day)
Avg Annual
Demand per
ERC
(gal/year)