DDW-2024-011415

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
Tim Davis
Director

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor

March 13, 2023

Jacob Sharp
Ferron-Castle Valley SSD
PO Box 877
Castle Dale, Utah 84513

Subject: System-Specific Minimum Sizing Standards
Ferron-Castle Valley SSD, System #08004, File #12540

Dear Jacob Sharp:

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:

Peak Day Source Demand (gal/day/ERC) – 627 gal/day/ERC
Average Annual Demand (gal/yr/ERC) –96,528 gal/yr/ERC
Equalization Storage (gal/ERC) – 263 gal/ERC
Fire Storage (gal) – 120,000 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

Ferron-Castle Valley SSD is a community water system with a total population of 1660, 681
residential connections, 15 commercial connections, 1 combined connection and 7 industrial
connections. The system’s facilities include three storage tanks and a surface water intake with a
surface water treatment plant.
Jacob Sharp
Page 2 of 3
March 13, 2023

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 your office on
June 14, 2022. The Division allowed for 30 days for your water system to review the draft system-
specific minimum sizing. The Division did not receive any comments for the draft sizing
standards. Therefore, the Division is setting system-specific minimum sizing standard for 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 Ferron-Castle Valley SSD.

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.

Jacob Sharp
Page 3 of 3
March 13, 2023

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 Sarah Romero, of this office, at
[phone], or Michael Newberry, Engineering Manager, at [phone]. 

Sincerely,

Michael Newberry, P.E.
Engineering Manager

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

cc: Orion Rogers, Southeast Utah Health Department, [e-mail]
Russell Seeley, Division of Drinking Water, [e-mail]
Jacob Sharp, Ferron-Castle Valley, [e-mail]
Sarah Romero, Division of Drinking Water, [e-mail]
Ted Black, Office of the State Fire Marshal, [e-mail]

DDW-2023-003588

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards

Date Standard Effective: Thu Mar 02 15:07:54 MST 2023
Peak Day Source Demand per ERC (gal/day): 627
Average Annual Demand per ERC (gal/day): 96,528
Equalization Storage per ERC (gal/day): 263
FERRON - CASTLE VALLEY SSD PWS ID: UTAH08004
Admin Name: JACOB SHARP
Address:
City, State, Zip: ,
Phone: [phone]
Email: [e-mail]
System Type: Community
Population: 1,660
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS VARIABILITY
Data from these reporting years: 2019, 2020, 2021
Max Peak Day Source Demand per ERC (gal/day): 536
Max Average Annual Demand per ERC (gal/day): 89,961
Max Equalization Storage per ERC (gal/day): 246
x
x
x
(1 + 0.17)
(1 + 0.073)
(1 + 0.07)
=
=
=
627
96,528
263
DWRi WATER USE DATA REPORTED
Equalization per ERC (gal): 263
Existing Storage (gal): 830,000
ERCs: 742
Required Storage w/o Fire Flow: 195,146
Required Fire Storage (gal): 120,000
Required Storage w/Fire (gal): 315,146
Storage Deficiency: 0
Storage Deficiency (%): 0.0
No Storage Deficiency
Peak Day Source Demand per ERC (gpm): 0.44
Existing Source Capacity (gpm): 350
ERCs: 742
Required Resource Capacity (gpm): 326
Source Deficiency: 0
Source Deficiency (%): null
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/day)
Equaliza
tion
Storage
per ERC
(gal/day)
OP
Days
2021 391,021 61,370,777.34 729 536 84,185 231 365
2020 391,021 66,750,577.35 742 527 89,961 246 366
2019 332,368 60,868,966.8 726 458 83,842 230 365
Variability:0.022 0.17 0.073 0.07
Year Peak Month Average
(gal/day)
Peak Month Average
per ERD (gal/day)
Ratio of PD/ERC to
Peak Month Avg/ERC
2021 178,061 244 2.2
2020 194,564 262 2.01
2019 186,470 257 1.78
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
ST001 500K TANK - ST001 500,000
ST002 250K TANK - ST002 250,000
ST003 80K TANK - GOLF COURSE 80,000
Storage Totals: 830,000 GAL
Source ID Source Name Flow Rate (GPM)
TP002 2015 TREATMENT PLANT 350
Source Totals: 350 GPM