DDW-2024-010250

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

GARY R. HERBERT
Governor

SPENCER J. COX
Lieutenant Governor
Department of
Environmental Quality

L. Scott Baird
Executive Director

DIVISION OF DRINKING WATER
Marie E. Owens, P.E.
Director

June 24, 2020

Jason Helm
Granger-Hunter Improvement District
P.O. Box 701110
West Valley City, Utah 84119

Subject: System-Specific Minimum Sizing Standards
Granger-Hunter Improvement District, System #18007, File #11573

Dear Mr. Helm:

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 Granger-Hunter Improvement
District:

Peak Day Source Demand – 1,116 gal/day/ERC
Average Annual Demand – 121,083 gal/year/ERC
Equalization Storage – 573 gal/ERC
Fire Storage – 5,000,000 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

Granger-Hunter Improvement District is a community water system which provides culinary
water for both indoor and outdoor use to a population of approximately 121,083 people.

Jason Helm
Page 2 of 3
June 24, 2020

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 and an engineering study was not submitted
to the Division for review. Therefore, the Division analyzed the submitted DWRi water use data
and sent a draft summary of the resulting system-specific minimum sizing standards to you on
March 6, 2020. The Division allowed time for your water system to review the draft system-
specific minimum sizing. You replied on May 26, 2020 to inform the Division that you had
updated the water use data with DWRi. The Division sent you an updated draft summary of the
resulting system-specific minimum sizing standards on May 29, 2020 and you verified they are
representative; therefore, the Division is setting system-specific minimum sizing standard for
Granger-Hunter Improvement District.

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 provided from West Valley City Fire on June 22,
2020.

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.

Jason Helm
Page 3 of 3
June 24, 2020

Source Capacity

The Division has documentation of established safe yields for all of 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 Julie Cobleigh, of this office, at
[phone], or Nathan Lunstad, Engineering Manager, at [phone]. 

Sincerely,

Nathan Lunstad, P.E.
Engineering Manager

JJC/nl/mdb

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

cc: Jorge Mendez, Salt Lake County Health Department, [e-mail]
Jason Helm, Granger Hunter Improvement District, [e-mail]
Todd Marti, Granger Hunter Improvement District, [e-mail]
Julie Cobleigh, Division of Drinking Water, [e-mail]
Gavin Moffat, West Valley City Fire Department, [e-mail]
Coy Porter, Office of the State Fire Marshal, [e-mail]

DDW-2020-014685
UTAH18007 GRANGER-HUNTER IMPROVEMENT DISTRICT PWS ID:
HELM, JASON
PO BOX 701110
WEST VALLEY CITY, UT 84119
Phone: [phone]
Emergency Phone: [phone]
Population:121,083
System Type:Community
[e-mail]
Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Peak Day Source Demand Per ERC (gal/day):1,116
Average Annual Demand Per ERC (gal/year):209,147
Equalization Storage Per ERC (gal/day):573
Date Standard Effective:05/29/2020
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS
Max Peak Day Source Demand Per ERC (gal/day):1,094
Max Average Annual Demand Per ERC (gal/day):183,462
Max Equalization Storage Per ERC (gal/day):503
Data from these reporting years:2016 to 2018
2%
14%
14%
Variability
Factor
1,116
209,147
573
x
x
x
=
=
=
DWRi WATER USE DATA REPORTED
Data Year Peak Day
Source
Demand
(gal/day)
ERCsAverage
Annual
Demand
(gallons)
Op
Days
Peak Demand
per ERC
(gal/day)
Avg Annual
Demand per ERC
(gal/year)
Equalization
Storage per ERC
(gal/day)
2018 47,997,852 44,9158,240,176,663 1,069 183,462 503 365
2017 49,855,203 45,6097,308,127,516 1,093 160,234 439 365
2016 51,810,309 47,3497,989,104,876 1,094 168,728 462 365
14%2%5% Variability
Data Year Peak Month
Average
(gal/day)
Ratio of
PD/ERC to
Peak
Month
Avg/ERC
Peak Month Average
per ERC
(gal/day)

2018 47,679,359 1,062 1.0
2017 41,324,949 906 1.2
2016 46,249,609 977 1.1
SYSTEM STORAGE AND SOURCE INVENTORY
CAPACITY CALCULATIONS FOR STORAGE
SYSTEM STORAGE DETAILS
ST001 TANK 1 2,000,000 GAL
ST002 TANK 2 1,000,000 GAL
ST004 ANDRA TANK 3,000,000 GAL
ST009 ACORD STORAGE 2,000,000 GAL
ST005 BREEZE TANK 8,800,000 GAL
ST006 SORENSON STORAGE 2,000,000 GAL
ST007 RIDGELAND #5 STORAGE 2,000,000 GAL
ST008 ZONE 5 2,600,000 GAL
ST010 NEW WINDER 4 MG TANK 4,000,000 GAL
27,400,000Storage Totals:GAL
SYSTEM SOURCE DETAILS
WS002 SANDERSON WELL #1 1,200 GPM
WS012 WOODBURY #8 WELL 2,200 GPM
WS014 ACORD WELL #12 2,000 GPM
WS015 WRIGHT #14 WELL 1,100 GPM
WS016 EVANS #15 WELL 3,000 GPM
WS017 TAGGART #16 WELL 3,000 GPM
WS019 WELL # 17 2,333 GPM
WS006 UTAH18027 JORDAN VALLEY WCD 0 GPM
14,833Source Totals: GPM
STORAGE CALCULATION
3,336,295 89.1%
Deficiency solely due to Fire Storage
Storage Deficiency:
ERCs:44,915
Required Storage w/o Fire Flow (gal):25,736,295
Required Fire Storage (gal)5,000,000
Required Storage w/Fire (gal)30,736,295
Equalization Storage per ERC (gal):573
Existing Storage (gal): 27,400,000