DDW-2024-014612

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

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 8, 2021

Julie Tanner
East Grouse Creek Pipeline Company
P.O. Box 74
Grouse Creek, Utah 84313

Subject: Conditional Plan Approval, Buckskin Tank Chlorinator (TP002);
East Grouse Creek Pipeline Company, System #02010, File #12475, SRF #3F1783

Dear Julie Tanner:

The Division of Drinking Water (the Division) received the plans and specifications for the
Buckskin Tank Chlorinator from your consultant, Eric Dursteler, P.E., with Forsgren Associates,
on September 20, 2021. Written review comments were provided to your consultant on September
30, 2021. The Division received the revised plans and specifications on October 15, 2021. This
project has met the conditions for receiving a plan approval.

Our understanding of the project is the installation of a new gas chlorination facility in the vicinity
of the system’s Primary Tank (ST001), also known as the Buckskin Tank. The project will include
installing a new gas chlorination system consisting of two (2) 150-pound chlorine gas cylinders on
a dual-cylinder manual scale, a Regal Model 216 automatic switchover gas chlorinator, and a new
chlorine solution feed line and injector assembly. The chlorinator will be installed inside a new,
prefabricated concrete shed equipped with a solar-electric power system for the chlorinator room
heating, lighting, and ventilation. A new security fence will be installed around the new
chlorinator shed and the existing Primary Tank. The Buckskin Tank Chlorinator is identified as
TP002 in the Division’s database.

The plan review of the proposed Buckskin Tank Chlorinator (TP002) has been completed
according to the following:

1. The proposed Buckskin Tank Chlorinator is a Regal Model 216 automatic switchover gas
chlorinator
2. This chlorinator will add chlorine to the water from Buckskin Spring (WS001).
3. This chlorinator is intended to provide secondary disinfection in the distribution system.

Julie Tanner
Page 2 of 4
November 8, 2021

4. The chlorinated water will enter the Primary Tank (ST001), also known as the Buckskin
Tank, and then flow to the distribution system.
5. The proposed chlorine gas for disinfection meets the ANSI/NSF 60 standard.
6. The proposed design target dose of 2.0 mg/L or ppm (measured as free chlorine) is based
on a typical flow of 42 gallons per minute (gpm) from Buckskin Spring.
7. The chlorine dose will be automatically adjusted by a Regal Series 7000 Smartvalve Gas
Feed Regulator based on a flow from the spring.

We have completed our review of the plans and specifications, stamped, and signed by Eric
Dursteler, P.E., dated September 17, 2021, and find they basically comply with the applicable
portions of Utah’s Administrative Rules for Public Drinking Water Systems in R309. On this
basis, we hereby approve the proposed plans to construct Buckskin Tank Chlorinator
(TP002) with the following condition:

1. Take monthly bacteriological samples of the Buckskin Spring (WS001), prior to any
treatment, for the months this source is in operation. The intent of this source sampling is
to gather data to determine whether Buckskin Spring (WS001) is required to be treated for
primary disinfection.  
a. The source sampling requirement shall begin no later than April 2022 and extend
to cover the duration of at least 18 months, sufficient to span two spring/summer
cycles.
b. The sampling location of the source water bacteriological samples needs to be
labeled as WS001.
c. The source bacteriological sampling is in addition to the monthly total coliform
sampling in the distribution system (DS001) that has been in place for your water
system.
d. In the result of an Escherichia coli (E. coli) positive sample, please contact Sitara
Federico at [phone] or [e-mail] within 24 hours of notification
of positive sample.

You must fulfill and comply with the condition of approval, or this approval is invalid.

This conditional approval pertains to construction only. An Operating Permit must be obtained
from the Director before Buckskin Tank Chlorinator may be put in service. A checklist
outlining the items required for operating permit issuance is enclosed for your information.

Approvals or permits from the local authority or the 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.
Julie Tanner
Page 3 of 4
November 8, 2021

Secondary Disinfection Requirements

The Division has determined that the East Grouse Creek Pipeline Company must provide
continuous disinfection to maintain detectable chlorine residuals throughout the distribution
system. In October 1991 and January 1992 total coliform bacteria were detected in the water
samples taken in your distribution system. East Grouse Creek Pipeline Company did not submit
required monthly samples or repeat samples on five occasions between August 1991 and March
1992. On April 23, 1992, the Division issued an order requiring East Grouse Creek Pipeline
Company to maintain a detectable chlorine residual throughout the distribution system. The
proposed Buckskin Tank Chlorinator (TP002) is intended to provide a detectable disinfectant
residual in the distribution system for secondary disinfection.

The plan review of the proposed Buckskin Tank Chlorinator (TP002) is based on providing
secondary disinfection. When this chlorinator is installed and placed in operation after the
Operating Permit issuance, the East Grouse Creek Pipeline Company will be required to
demonstrate ongoing compliance with the following secondary disinfection requirements:

1. Chlorine Residual ‒ Distribution System (DS001)
a. This water system will be required maintain a detectable residual throughout the
distribution system. It is recommended to maintain the chlorine residual above 0.1
ppm in the distribution system. [R309-520-5]
b. The chlorine residual measured in the distribution system must not exceed the
maximum residual disinfectant level (MRDL) of 4.0 mg/L (measured as free
chlorine). [R309-200-5(3)(c)(iv)]
c. This water system will be required to take a minimum of three (3) chlorine
residual samples per week at varying locations throughout its distribution
system (DS001). [R309-105-10(1)(c)]
d. Take distribution system chlorine residuals in conjunction with total coliform
sampling. [R309-215-10(3) and (4)]

2. Chlorine Residual ‒ Point of Entry to Distribution System (EP002)
a. The Point of Entry (POE) sampling location for the Buckskin Tank Chlorinator
(TP002) will be a private residence located at 11650 North 77200 West. This
home is the first service connection downstream from the Primary Tank (Buckskin
Tank). This POE sampling location will be identified as EP002 in the Division’s
database.
b. This water system will be required to maintain a minimum of 0.2 mg/L residual
(measured as free chlorine) at the POE sampling location. [R309-215-5(3) and
R309-215-10(2)]
c. The chlorine residual measured at the POE sampling location must not exceed the
maximum residual disinfectant level (MRDL) of 4.0 mg/L (measured as free
chlorine). [R309-200-5(3)(c)(iv)]
Julie Tanner
Page 4 of 4
November 8, 2021

d. This water system will be required to record and report the free chlorine residual at
the Buckskin Tank Chlorinator POE sampling location (EP002) a minimum
of 3 days a week. [R309-210-8(3)(a)(ii)]

Please be aware if any water source of the East Grouse Creek Pipeline Company is found to
require primary disinfection in the future per R309-200-5(7)(a)(i), additional regulations will
apply. This will include submitting disinfection CT information showing compliance with 4-log
virus inactivation in accordance with the Ground Water Rule in R309-215-16.

The project, as described herein, is generally eligible for assistance under the Utah Drinking
Water Project Assistance Program. All change orders will need to be reviewed and approval for
compliance with the Utah Drinking Water Rules and the conditions of this plan approval. The
project may now be advertised for bids. But, as a condition of the project funding, you must not
award the contact or proceed with the construction until the Division of Drinking Water has
authorized you to do so. This is necessary to comply with applicable requirements and to protect
you, as the funding recipient, by ensuring that the contract meets requirements for funded projects.

You should arrange a pre-bid contract conference with the prospective bidders to familiarize them
with the policies and procedures of this project. Please coordinate the details with Heather Pattee
([e-mail]) of our staff.

If you have any questions regarding this conditional plan approval, please contact Hunter Payne,
of this office, at [phone], or me at [phone].

Sincerely,

Michael Newberry, P.E.
Engineering Manager

HP/mrn/mdb

Enclosures – Operating Permit Checklist
Addendum ‒ Estimated Disinfection CT & Summary
Disinfection CT Calculation Sheet

cc: Ben Harker, Bear River Health Department, [e-mail]
Eric Dursteler, Forsgren Associates, [e-mail]
Julie Tanner, East Grouse Creek Pipeline Company, [e-mail]
Hunter Payne, Division of Drinking Water, [e-mail]
Morgan Vinyard, Division of Drinking Water, [e-mail]
Heather Pattee, Division of Drinking Water, [e-mail]
Elisa Brawley, Division of Drinking Water, [e-mail]
Colt Smith, Division of Drinking Water, [e-mail]
Sitara Federico, Division of Drinking Water, [e-mail]

DDW-2021-028562 

Utah Division of Drinking Water ― Checklist for Issuing Operating Permits
Water System Name: System Number:
Project Description: File Number:
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).
Distribution lines (not including in-line booster pump stations) requiring Plan Approval may be
placed into service prior to submitting all of the following items and receipt of Operating Permit
if the water system has received items 1 and 4 below.

☐ 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 Mains
Two 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 Facilities
One or more samples, none positive
☐ ANSI/AWWA C653-13 AWWA Standard for Disinfection of Water Treatment
Plants
Two consecutive samples per unit, none positive, no less than 30 minutes apart
☐ ANSI/AWWA C654-13 AWWA Standard for Disinfection of Wells
Two consecutive samples, none positive, no less than 30 minutes apart
☐ 5. Water quality data, where appropriate [For example, include raw and finished water data that
demonstrate satisfactory performance of the treatment facility; sample should be taken from a
storage tank for residual volatile organic compounds after tank interior re-coating; etc.]
☐ 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 source

ADDENDUM
Plan Review – Estimated Disinfection CT
East Grouse Creek Pipeline Company (UTAH #02010)
Proposed Buckskin Tank Chlorinator (TP002, File #12475)

A system’s pathogen treatment effectiveness is typically expressed in terms of log10 removal or
inactivation. For example, primary disinfection of a groundwater source is demonstrated by
meeting a 4-log10 inactivation for virus. The level of inactivation by disinfection is calculated by
taking the disinfection residual (Concentration) multiplied by the contact Time, or is referred to
in terms of CT. For groundwater sources that must have continuous disinfection, a minimum CT
of 12 is required for 4-log virus inactivation for water pH ranges between 6 and 9 and a worst-
case scenario of water temperature of 0.5°C.

The Division’s review of estimated CT information is limited to the disinfection CT that may be
achieved in a worst-case scenario based on the proposed system configuration. The estimated
worst-case scenario disinfect CT value may not reflect the actual CT that will be achieved when
the proposed chlorinator is used for ongoing operation in the future. Please be aware if any water
source of the East Grouse Creek Pipeline Company is found to require primary disinfection in
the future per R309-200-5(7)(a)(i), additional regulations will apply.

The Division received the following information of the worst-case scenario disinfection CT
estimated by your consultant during the plan review phase.

1. The worst-case scenario disinfection CT before the chlorinated water reaches the point of
entry to distribution system (POE) sampling location is estimated to be 13.3, which is
anticipated to meet the 4-log virus inactivation of groundwater sources (a minimum CT
of 12).
2. POE Sampling Location: The proposed POE sampling location is described as a
private residence located at 11650 North 77200 West. This home is the first service
connection downstream from the Primary Tank (Buckskin Tank).
3. Chlorine Residual at POE: The CT estimate is based on chlorine residual at POE at 0.3
mg/L (measured as free chlorine) as the worst-case scenario.
4. pH: The CT estimate is based on water pH ranging between 6 and 9.
5. Temperature: The CT estimate is based on the worst-case scenario of winter water
temperature of 0.5°C.
6. Disinfection CT: The estimated worst-case scenario disinfection CT of 13.3
encompasses the CT segments described in the attached CT summary table. Also
attached is the CT calculation sheet.

Summary ‒ Estimated Worst‐Case Disinfection CT 1‐Nov‐21
UTAH #02010
TP002
12475
13.3
Segment Description Volume (Gallon) Tank Baffling Factor Chlorine Residual (mg/L) Peak Flow Rate (gpm) Estimated CT
SEGMENT 1: Buckskin
Tank (AKA Primary Tank
ST001) that receives the
chlorinated water.
Buckskin Tank (AKA Primary Tank
ST001) has a nominal volume of
40,000 gallons but its minimum
operating volume is 5,000 gallons
representing a minimum water depth of
1.5 feet. The Primary Tank is operated
in tandem with the Tank #2 (ST002).
Disinfection CT calculation is based on
5,000 gallons.
This tank is not baffled and
has a single inlet/outlet pipe.
A baffle factor of 0.1 is used
in the CT calculation.
The chlorine residual at the outlet
of this tank is estimated to be 2.0
mg/L (measured as free chlorine).
A flow rate of 150 gallons per
minute (gpm), which represents
the maximum expected demand
from the East Grouse Creek
Pipeline Company drawing
down the water level in
Primary Storage (ST001), was
used in the CT calculation.
6.7
SEGMENT 2:
Transmission pipe between
the Primary Tank (ST001)
and the Point-of-Entry
sampling location
This pipeline has a length of 5070 feet
and a diameter of 4 inches. The pipe is
anticipated to be 100% full. The pipe is
below the elevation of the Primary
Storage (ST001).
N/A The chlorine residual at the end of
this pipeline is estimated to be 0.3
mg/L (measured as free chlorine)
A flow rate of 150 gallons per
minute (gpm), which represents
the expected water flow from
the Primary Tank (ST001) to
the distribution system was
used in the CT calculation.
6.6
Total Estimated Disinfection CT (sum of CT values for each segment described below):
East Grouse Creek Pipeline Company
Proposed Buckskin Tank Chlorinator
Plan Review File
Estimate Disinfection CT & Whether Meeting 4-Log Virus Inactivation
Estimate Pipe Volume V=L*Pi*(R)2
Pipe
Description Length (ft)Diameter
(inches)
Diameter
(feet)Volume (ft3)Volume (gal) % Full
Effective Water
Volume (gal)
Transmission 1 5070 4 0.33 442.4 3309.5 100%3309.5
0.00 0.0 0.0 0.0
0.00 0.0 0.0 0.0
0.00 0.0 0.0 0.0
0.00 0.0 0.0 0.0
0.00 0.0 0.0 0.0
3309.5
Estimate Pipe Disinfection CT
Residual
Conc., C
(mg/L) 1 pH 2 Temp. (°C) 3
(See Table B
below)
Peak Flow
(gpm)
Effective
Volume
(gal)
Total
Detention
Time (min)
Contact
Time (T)
(min)
Total Pipe CT
(C*T) 4
0.3 6-9 0.5 150.0 3309.5 22.1 22.1 6.6
Estimate Storage Tank Volume & Disinfection CT
Tank
Description
Residual
Conc., C
(mg/L)
pH 2 Temp. (°C) 3
(See Table B
below)
Peak Flow
(gpm)
Baffling
Factor, BF
(See Table A
below)
Minimum
Volume
(gal) (at
lowest setting)
Total Detention
Time, TDT (min)
Contact
Time (T)
(min)
CT (C*T)
Vol/Peak Flow TDT x BF C*T
ST001 Buckskin 2 6-9 0.5 150.0 0.1 5,000 33.3 3.3 6.7
6-9 0.5 1.0 0.0 0.0 0.0
6-9 0.5 1.0 0.0 0.0 0.0
6-9 0.5 1.0 0.0 0.0 0.0
6-9 0.5 1.0 0.0 0.0 0.0
6-9 0.5 1.0 0.0 0.0 0.0
6.7
Summary
12 (See Table B below, assuming worst scenario)
13.3 (= Total Pipe CT + Total Tank CT)
Yes
Notes:
1. Residual conc. is the disinfectant level measured at (or after) the end of the pipe/vessel [NOT the dose added at the beginning of the pipe/vessel].
2. Assuming pH between 6 and 9
3. Assuming water temperature of 0.5 °C in winter worst scenario
4. This tool provides rough estimate of disinfection CT. For detailed design, apply additional safety factor and other design considerations.
Factor
6-9 10
0.5 12 90
5860
10 6 45
15 4 30
20 3 2225 2 15
Enter only the green field
CT Req'd for 4-Log Virus Inactivation
Perforated inlet baffle, serpentine or
perforated intra-basin baffles, outlet weir or
perforated launders
0.1
Total Pipe Effecive Volume (gallons)
pHTemp (oC)
Total Estimated Disinfection CT 4
Meeting 4-Log Virus Inactivation?
None, agitated basin, very low length to
width ratio, high inlet/outlet velocities
Total Tank CT 4
East Grouse Creek Pipeline Company Water System #02010 File #12475
Very high L to W ratio (pipeline flow),
perforated inlet, outlet & intra-basin baffles
4- Log Inactivation of VirusesDescription
Table A
Tank Baffling Factors
0.7
1
0.3
0.5
Single or mutliple unbaffled inlets or outlets,
no intra-basin baffles
Baffled inlet/outlet with some intra-basin
baffling
Table B
Free Chlorine CT Values (per EPA, 1991)
DDW-Eng-0031 1 5/13/2016