DDW-2025-002032

Danielle Zebelean <[e-mail]>
Washington County WCD - Quail Lake (Sys #27094); File 14989 - Quail Creek WTP
Expansion and Ozone Addition
7 messages
DDW PNF <[e-mail]>Wed, Jun 5, 2024 at 7:55 AM
To: "Williams, Jeremy S" <[e-mail]>, Danielle Zebelean <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "Bird, Tyler" <[e-mail]>, "Hall, Brooklyn"
<[e-mail]>, "J. Paul Wright" <[e-mail]>
Mr. Williams:

On June 5, 2024, the Division of Drinking Water received the attached project notification form for the proposed ozone
addition and capacity expansion of the Quail Creek WTP project for the Washington County WCD – Quail Lake water
system. This project is referenced as Water System #27094, File #14989 in our plan review database. Please use
these numbers for future correspondence related to this project. This project will be reviewed by Dani Zebelean.
Please contact her at [e-mail] or [phone] if you have any questions. Thank you.
DDW PNF Team
Division of Drinking Water
Phone: [phone]
Fax: [phone]
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
14989 PNF - TP001 Expansion.xlsm
37K
Danielle Zebelean <[e-mail]>Wed, Jun 5, 2024 at 7:56 AM
To: Sarah Page <[e-mail]>
FYI Washington County is installing Ozone.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
3/4/25, 9:09 AM State of Utah Mail - Washington County WCD - Quail Lake (Sys #27094); File 14989 - Quail Creek WTP Expansion and Ozone Addit…
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1801029691181877162&simpl=msg-f:180102969118187716…1/4
14989 PNF - TP001 Expansion.xlsm
37K
Sarah Page <[e-mail]>Wed, Jun 5, 2024 at 8:25 AM
To: Danielle Zebelean <[e-mail]>
Will the filters need to be re-rated to accommodate that capacity increase?
Sarah Page, PhD
Lead Drinking Water Treatment Specialist
Division of Drinking Water
P: [phone]
drinkingwater.utah.gov
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Wed, Jun 5, 2024 at 8:59 AM
To: Sarah Page <[e-mail]>
It says they're adding 30 MGD of DAF over the filters? I will probably need to figure that out once plans come in.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Sarah Page <[e-mail]>Wed, Jun 5, 2024 at 9:02 AM
To: Danielle Zebelean <[e-mail]>
Yeah, that sounds unusual.
Sarah Page, PhD
Lead Drinking Water Treatment Specialist
Division of Drinking Water
P: [phone]
drinkingwater.utah.gov
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Mon, Jul 15, 2024 at 11:22 AM
To: Danielle Zebelean <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "Bird, Tyler" <[e-mail]>, "Hall, Brooklyn"
<[e-mail]>, "J. Paul Wright" <[e-mail]>
Dani,
3/4/25, 9:09 AM State of Utah Mail - Washington County WCD - Quail Lake (Sys #27094); File 14989 - Quail Creek WTP Expansion and Ozone Addit…
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1801029691181877162&simpl=msg-f:180102969118187716…2/4

We will submit the Basis of Design Report and Preliminary Design drawings to WCWCD this week for the
subject project, and we will also share with you.

The QCWTP is unique in that it is the only drinking water dissolved air flotation (DAF) facility in the State.
With that in mind, there are some design criteria associated with DAF that we should talk through with you
just to make sure we’re all on the same page.

Do you have time later this week for a 1-hr Teams call? Thursday afternoon or Friday work for me, please let
me know what works best for you.

Thanks,

Jeremy Williams, PE
Associate Vice President | Project Manager | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
(direct) 385-342-1082 | (cell) 801-885-2060
www.hazenandsawyer.com

From: [e-mail] <[e-mail]> On Behalf Of DDW PNF
Sent: Wednesday, June 5, 2024 7:56 AM
To: Williams, Jeremy S <[e-mail]>; Danielle Zebelean <[e-mail]>
Cc: Randy Johnson <[e-mail]>; Bird, Tyler <[e-mail]>; Hall, Brooklyn
<[e-mail]>; J. Paul Wright <[e-mail]>
Subject: Washington County WCD - Quail Lake (Sys #27094); File 14989 - Quail Creek WTP Expansion and Ozone
Addion

Caution! External email – think before you click
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Mon, Jul 15, 2024 at 6:40 PM
To: "Williams, Jeremy S" <[e-mail]>
Cc: "Bird, Tyler" <[e-mail]>, "Hall, Brooklyn" <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Randy Johnson <[e-mail]>, Sarah Page <[e-mail]>
Hi Jeremy!
That is very exciting! I have time from 4-5pm on Thursday for a call to discuss the DAF. If that doesn’t work for you we can
look out into the next week.
3/4/25, 9:09 AM State of Utah Mail - Washington County WCD - Quail Lake (Sys #27094); File 14989 - Quail Creek WTP Expansion and Ozone Addit…
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1801029691181877162&simpl=msg-f:180102969118187716…3/4
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
3/4/25, 9:09 AM State of Utah Mail - Washington County WCD - Quail Lake (Sys #27094); File 14989 - Quail Creek WTP Expansion and Ozone Addit…
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1801029691181877162&simpl=msg-f:180102969118187716…4/4
Danielle Zebelean <[e-mail]>
RE: Quail Creek WTP Preliminary Design Coordination
22 messages
Bird, Tyler <[e-mail]>Mon, Jul 22, 2024 at 9:51 AM
To: "Williams, Jeremy S" <[e-mail]>, Danielle Zebelean <[e-mail]>, Randy Johnson
<[e-mail]>, "J. Paul Wright" <[e-mail]>, Sarah Page <[e-mail]>
Cc: "Hall, Brooklyn" <[e-mail]>
Hi Danielle and Sarah,

Thank you for taking some time with us last week to discuss the proposed improvements to the Quail Creek Water
Treatment Plant (QCWTP) that will be made as part of the QCWTP 90 mgd Expansion and Ozone Addition Project. The
summary below provides a brief reminder of the major plant improvements that will be made as part of this project:

QCWTP capacity will be expanded from 60 mgd to 90 mgd (net, or out the door capacity)
The existing pretreatment basins used for powder activated carbon (PAC) adsorption of T&O compounds will be
removed and replaced with new ozone contactors and an ozone generation building. Ozone will replace potassium
permanganate as the pre-oxidant and will also replace PAC for taste and odor removal. Ozone will not be used for
primary disinfection.
The existing dissolved air flotation basins will be rerated from 40 mgd to 60 mgd (net capacity). Hazen is confident
in this approach and will send documentation supporting higher DAF rates in a separate email. The rerated DAF
will be run at 55 mgd (net) and all flow from DAF will go to the existing filters. The capacity of the existing filters will
not be changed as part of this project.
The existing 20 mgd floc/sed basins will demolished and replaced with 35 mgd of dissolved air flotation over filters
(known as stacked DAF or DAFF). Hazen is confident in this approach and will send documentation supporting the
use of DAFF at QCWTP. Hazen has designed several successful DAFF facilities throughout the country.
The 2003 UV/Clearwell Building was designed for UV but UV reactors were not installed. UV reactors will be
installed in the existing UV building as part of this project. UV disinfection will be used to satisfy 0.5 log Giardia
inactivation requirements. Sodium hypochlorite will still be used 2-log virus inactivation.

Link to BODR (for DDW folks): QCWTP Basis of Design Report.pdf

Link to BODR (for WCWCD and Hazen folks): QCWTP Basis of Design Report.pdf

Please let me know if you have any trouble downloading the file.

Let’s plan to have another call in a few weeks (early to mid August) to go over any questions you may have on the BODR.
In the meantime, we will work on preparing the supporting information that you requested for rerated DAF and for new
DAFF.

Thanks and have a great day,

3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…1/13
Tyler Bird, PE

Associate | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
385-342-1083 (direct) | 801-455-2168 (cell)
[e-mail] | hazenandsawyer.com

-----Original Appointment-----
From: Williams, Jeremy S <[e-mail]>
Sent: Tuesday, July 16, 2024 1:08 PM
To: Williams, Jeremy S; Danielle Zebelean; Randy Johnson; Bird, Tyler; J. Paul Wright; Sarah Page
Cc: Hall, Brooklyn
Subject: Quail Creek WTP Preliminary Design Coordinaon
When: Thursday, July 18, 2024 4:00 PM-4:30 PM (UTC-07:00) Mountain Time (US & Canada).
Where: Microso Teams Meeng

Purpose: Discuss the overall project and key items that may interest DDW

Agenda:
Project overview
Schedule
Status
Discuss select design criteria

________________________________________________________________________________
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Join the meeting now
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Passcode: Azwj27
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3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…2/13
________________________________________________________________________________

Danielle Zebelean <[e-mail]>Tue, Jul 30, 2024 at 1:13 PM
To: "Bird, Tyler" <[e-mail]>
Cc: "Williams, Jeremy S" <[e-mail]>, Randy Johnson <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Sarah Page <[e-mail]>, "Hall, Brooklyn" <[e-mail]>
Hi Tyler,
Sorry for the delay, thank you for the basis of design report. I am just starting to review this. How would you like me to
document any comments or questions on the draft?
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Bird, Tyler <[e-mail]>Tue, Jul 30, 2024 at 3:28 PM
To: Danielle Zebelean <[e-mail]>
Cc: "Williams, Jeremy S" <[e-mail]>, Randy Johnson <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Sarah Page <[e-mail]>, "Hall, Brooklyn" <[e-mail]>
Hi Dani,

Great question! We can track your comments a couple different ways. I am open to whichever method
works best for you. Below is a list of potential options:

You can markup up the BODR with your comments using PDF tools and then send me a copy of the
revised file that contains your comments.
I can set up a BlueBeam Studio Review session that will allow multiple DDW folks to review/comment
on the document at the same time. There is a free BlueBeam Viewer that you can use to access the
studio session if needed.
I can send you a MSWord version of the document and you can add comments to the document
using track changes.
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…3/13
You don't often get email from [e-mail]. Learn why this is important

Please let me know which method (or another method) works best for you and Sarah and Brooklyn and I will
get it set up.

Thanks,

Tyler Bird, PE

Associate | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
385-342-1083 (direct) | 801-455-2168 (cell)
[e-mail] | hazenandsawyer.com

From: Danielle Zebelean <[e-mail]>
Sent: Tuesday, July 30, 2024 1:14 PM
To: Bird, Tyler <[e-mail]>
Cc: Williams, Jeremy S <[e-mail]>; Randy Johnson <[e-mail]>; J. Paul
Wright <[e-mail]>; Sarah Page <[e-mail]>; Hall, Brooklyn <[e-mail]>
Subject: Re: Quail Creek WTP Preliminary Design Coordinaon

Caution! External email – think before you click
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Tue, Jul 30, 2024 at 3:32 PM
To: "Bird, Tyler" <[e-mail]>, Danielle Zebelean <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "J. Paul Wright" <[e-mail]>, Sarah Page <[e-mail]>, "Hall,
Brooklyn" <[e-mail]>
We could also send you a spreadsheet for a comment log and you can log comments there.

Whatever you prefer 😉
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Mon, Aug 5, 2024 at 4:40 PM
To: Danielle Zebelean <[e-mail]>, "Bird, Tyler" <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "J. Paul Wright" <[e-mail]>, Sarah Page <[e-mail]>, "Hall,
Brooklyn" <[e-mail]>
Dani,
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…4/13

Attached is the TM to support our recommended DAF and DAFF design criteria for the QCWTP expansion
project.

I also attached a comment log if you’d like to use that for your review comments. A PDF markup is also
acceptable.

Thanks,

Jeremy Williams, PE
Associate Vice President | Project Manager | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
(direct) 385-342-1082 | (cell) 801-885-2060
www.hazenandsawyer.com

From: Danielle Zebelean <[e-mail]>
Sent: Tuesday, July 30, 2024 1:14 PM
To: Bird, Tyler <[e-mail]>
Cc: Williams, Jeremy S <[e-mail]>; Randy Johnson <[e-mail]>; J. Paul
Wright <[e-mail]>; Sarah Page <[e-mail]>; Hall, Brooklyn <[e-mail]>
Subject: Re: Quail Creek WTP Preliminary Design Coordinaon

Caution! External email – think before you click

Hi Tyler,
[Quoted text hidden]
[Quoted text hidden]
2 attachments
QCWTP DAF and Filtration Process Design Criteria TM.pdf
2719K
QCWTP DAF TM Comment Log.xlsx
64K
Danielle Zebelean <[e-mail]>Tue, Aug 6, 2024 at 7:00 AM
To: "Williams, Jeremy S" <[e-mail]>
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…5/13
Cc: "Bird, Tyler" <[e-mail]>, Randy Johnson <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Sarah Page <[e-mail]>, "Hall, Brooklyn" <[e-mail]>
Thank you Jeremy!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Tue, Aug 6, 2024 at 3:36 PM
To: Danielle Zebelean <[e-mail]>
Hey, quick question.

Are you going down for the sanitary survey on 8/19 and 8/20?

WCWCD offered to have you down for a tour of the DAF facility so we could all walk the building and
discuss the changes to design criteria, as well as talk over the proposed stacked DAFF facility.

Any interest in getting together on the 21st? I can’t be down the 19th and 20th, but I could be down the
morning of the 21st and you could stay longer. If not, no big deal, we can schedule a tour any time.

Let me know what you think.
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Tue, Aug 6, 2024 at 5:50 PM
To: "Williams, Jeremy S" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Hi Jeremy,
Unfortunately, I will not be there for the survey this go around. Brent Arns and Sarah Page will be there. Looks like she is
leaving after the treatment plant survey on the 19th and is busy the rest of the week with other surveys. I will see if I can
get approval to be in St. George for the morning of the 21st since I need to be in Delta the 22. I will let you know tomorrow
if that gets approved!
If not we could look out to scheduling something later where Sarah and I can both be there.
Thanks!
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…6/13
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Wed, Aug 7, 2024 at 10:03 AM
To: Danielle Zebelean <[e-mail]>
Cc: Sarah Page <[e-mail]>
No worries. There’s no magic about the 21st, so if you’d prefer to defer a visit until both you and Sarah can
be there together, we can coordinate and make that happen. No big deal.

Let me know what you prefer.
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Thu, Aug 8, 2024 at 12:08 PM
To: "Williams, Jeremy S" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Hi Jeremy,
I was unable to get August 21st to work to come down for a visit. Right now it looks like the end of October (21, 22, or 29-
31) work for Sarah and I to come and visit and talk about the project. Sorry for the long look out we are currently traveling
a lot with surveys.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Thu, Aug 8, 2024 at 2:14 PM
To: Danielle Zebelean <[e-mail]>
Cc: Sarah Page <[e-mail]>
No worries, thanks for providing those dates.
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…7/13

I’ll run these by WCWCD and get back to you asap.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Mon, Aug 12, 2024 at 6:32 PM
To: Danielle Zebelean <[e-mail]>
Cc: Sarah Page <[e-mail]>
Let’s do October 29th.

What time works best for you guys, drive down in the morning and meet at 1:00, then head back that
afternoon?

Let me know and I’ll send an invite.
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Tue, Aug 13, 2024 at 1:02 PM
To: "Williams, Jeremy S" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Hi Jeremy,
That works for us! We will plan on meeting you at 1 at Quail Lake Treatment Plant.
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Bird, Tyler <[e-mail]>Mon, Sep 23, 2024 at 11:12 AM
To: "Williams, Jeremy S" <[e-mail]>, Danielle Zebelean <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "J. Paul Wright" <[e-mail]>, Sarah Page <[e-mail]>, "Hall,
Brooklyn" <[e-mail]>
Hi Dani,

I wanted to follow up and see how things are coming along with your review of the Quail Creek WTP Basis
of Design Report? Please feel free to reach out with any questions you may have as you go through the
report.
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…8/13

Thanks and have a great day,

Tyler Bird, PE

Associate | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
385-342-1083 (direct) | 801-455-2168 (cell)
[e-mail] | hazenandsawyer.com

[Quoted text hidden]
2 attachments
QCWTP DAF and Filtration Process Design Criteria TM.pdf
2719K
QCWTP DAF TM Comment Log.xlsx
64K
Danielle Zebelean <[e-mail]>Tue, Sep 24, 2024 at 7:39 AM
To: "Bird, Tyler" <[e-mail]>
Cc: "Williams, Jeremy S" <[e-mail]>, Randy Johnson <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Sarah Page <[e-mail]>, "Hall, Brooklyn" <[e-mail]>
Hi Tyler,
Sorry for the delay, I am hoping to be able to compile all our comments by the end of this week and send back to you. The
basis of design report and additional report on DAFF are very thorough, thank you very much for that.
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Bird, Tyler <[e-mail]>Tue, Sep 24, 2024 at 8:31 AM
To: Danielle Zebelean <[e-mail]>
Cc: "Williams, Jeremy S" <[e-mail]>, Randy Johnson <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Sarah Page <[e-mail]>, "Hall, Brooklyn" <[e-mail]>
Sounds good! Thanks Dani.
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:18052950059059811…9/13

As always, please reach out with any questions. Have a great day!

Tyler Bird, PE

Associate | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
385-342-1083 (direct) | 801-455-2168 (cell)
[e-mail] | hazenandsawyer.com

[Quoted text hidden]
Danielle Zebelean <[e-mail]>Thu, Sep 26, 2024 at 4:49 PM
To: "Bird, Tyler" <[e-mail]>
Cc: "Williams, Jeremy S" <[e-mail]>, Randy Johnson <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Sarah Page <[e-mail]>, "Hall, Brooklyn" <[e-mail]>
Hi Tyler and Hazen team,
Attached are the review comments on the Basis of Design and the DAF and Filtration Process Design Reports. Thank you
for your patience as we reviewed and were able to get into contact with a couple of EPA Regions and the
Connecticut Regulators. Please let me know if you have any questions or concerns about our comments. Look forward to
meeting with you all at the end of October.
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
QCWTP DAF TM Comment Log_DDW.xlsx
65K
Bird, Tyler <[e-mail]>Fri, Sep 27, 2024 at 8:17 AM
To: Danielle Zebelean <[e-mail]>
Cc: "Williams, Jeremy S" <[e-mail]>, Randy Johnson <[e-mail]>, "J. Paul Wright"
<[e-mail]>, Sarah Page <[e-mail]>, "Hall, Brooklyn" <[e-mail]>
Thanks Dani!

3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:1805295005905981…10/13
We will go through your comments and get back to you with any questions. We really appreciate your time
spent performing this review and look forward to your QCWTP site visit at the end of October.

Thanks,
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Mon, Oct 28, 2024 at 8:44 PM
To: "Bird, Tyler" <[e-mail]>, "Williams, Jeremy S" <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "J. Paul Wright" <[e-mail]>, Sarah Page <[e-mail]>, "Hall,
Brooklyn" <[e-mail]>
Hello!
Looking forward to seeing everyone tomorrow. Sarah and I should be there by 1. However, we may be late depending on
the road conditions from Beaver to Parisian. Hopefully the snow will be clear by the time we make it through there!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Mon, Oct 28, 2024 at 8:47 PM
To: Danielle Zebelean <[e-mail]>, "Bird, Tyler" <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "J. Paul Wright" <[e-mail]>, Sarah Page <[e-mail]>, "Hall,
Brooklyn" <[e-mail]>
Thanks for the update, and drive safe! It can be rough through that stretch, be safe.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Mon, Nov 11, 2024 at 11:25 AM
To: Danielle Zebelean <[e-mail]>, Sarah Page <[e-mail]>
Cc: Randy Johnson <[e-mail]>, "J. Paul Wright" <[e-mail]>, "Hall, Brooklyn"
<[e-mail]>, "Bird, Tyler" <[e-mail]>
Dani and Sarah,

Thanks again for your input and comments on this project, and for braving the weather to make the site visit
on the 29th! I think it was worth the effort, and there was some good discussion.

Attached is the jar testing memo that covered 5 min vs 10 min of flocculation for DAF or DAFF. For now, the
team is designing around 10 minutes for both the existing DAF rerate and new DAFF. If overall project cost
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:1805295005905981…11/13
becomes an affordability issue for WCWCD, the design for DAFF may revisit that decision and move to 5
min, but we’ll reach out if that comes up (~$4M capital savings).

Note that jar testing and pilot testing for DAFF is exactly the same as DAF (can’t stack the processes at the
bench or pilot scale, so they are jarred or piloted in sequence like DAF).

A memo addressing your review comments is in the works. We should have that for internal QC later this
week and to send to you for your review by early next week.

Thanks,

Jeremy Williams, PE
Associate Vice President | Project Manager | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
(direct) 385-342-1082 | (cell) 801-885-2060
www.hazenandsawyer.com

From: Williams, Jeremy S
Sent: Monday, August 5, 2024 4:41 PM
To: 'Danielle Zebelean' <[e-mail]>; Bird, Tyler <[e-mail]>
[Quoted text hidden]
[Quoted text hidden]
DAF Jar Test Memo - DRAFT.pdf
6242K
Sarah Page <[e-mail]>Mon, Dec 23, 2024 at 1:53 PM
To: Danielle Zebelean <[e-mail]>
Did we ever hear back from them? Is there anything outstanding that we need to do?
Sarah Page, PhD
Drinking Water Treatment Lead
Division of Drinking Water
P: [phone]
drinkingwater.utah.gov
[Quoted text hidden]
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:1805295005905981…12/13
DAF Jar Test Memo - DRAFT.pdf
6242K
3/4/25, 9:09 AM State of Utah Mail - RE: Quail Creek WTP Preliminary Design Coordination
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1805295005905981161&simpl=msg-f:1805295005905981…13/13
Danielle Zebelean <[e-mail]>
Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
18 messages
Danielle Zebelean <[e-mail]>Wed, Aug 21, 2024 at 12:03 PM
To: "Crosby, Jake" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Hi Jake,
We have a project that is proposed in Southern Utah to use DAFF in their treatment expansion project. They gave us a few facilities in the east coast
that use this technology in their drinking water plants (Bronx, NY; Fairfield, CT; Stamford, CT; Peekskill, NY). Could you put me in contact with someone
to understand how to rate the log removal values for this treatment technology?
For some further information, this plant currently has DAF and traditional coag/flocculation/sed processes that combine flows into filter beds. Currently
we've given them the conventional treatment credits for this. They want to change the coag/flocc/sed into the DAFF then combine the flows at the
disinfection step.
Thank you very much for your help!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
Danielle Zebelean <[e-mail]>Wed, Aug 21, 2024 at 12:06 PM
To: "Crosby, Jake" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Sorry, I realized I gave you the cities not the names of the treatment plants.
Croton Water Filtration Plant - Bronx, NY
Hemlocks WTP - Fairfield, CT
Stamford WTP - Stamford, CT
Peekskill WTP - Peekskill, NY
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Crosby, Jake <[e-mail]>Wed, Aug 21, 2024 at 3:47 PM
To: "[e-mail]" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Hi Dani,

Thanks for reaching out – and hope you are well! We only have one system that we directly regulate that uses DAF – Buffalo, WY. They use the DAF as
pre-treatment for Pall membranes, so they aren’t considered conventional filtration.
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…1/12

EPA issued a water supply guidance clarifying the definition of conventional vs direct filtration in 2009. I attached it as a reference. This guidance
specifically references DAF, here is the quote (on the 2nd page):

“The preamble for LT2 also clarifies what EPA means by designation of conventional filtration treatment through the review of
clarification process performance studies. Specifically, these studies indicate that plants using clarification processes other than
sedimentation that are located after coagulation and prior to filtration can achieve performance equivalent to conventional
filtration treatment plants. Based on these studies, any treatment train that includes coagulation/flocculation, clarification and
granular media filtration (e.g., sand-ballasted clarification or dissolved air floatation) may be regarded as conventional filtration
treatment and awarded treatment credit as conventional filtration treatment.”

I also found the reference to dissolved air flotation in the LT2ESWTR preamble from the federal register notice. I included a
screenshot of the language and the cited references below.

Based on these sources, I think you are OK to consider DAF followed by granular media filtration to be equivalent to conventional
filtration. I’m not very familiar with DAF as treatment, and I’m not sure if DAFF is different than DAF followed by granular media
filtration, so I may have misunderstood.

If you want more info, or would like to contact the EPA Region / state that regulates NY or CT I can reach out to my contacts to
see if I can get you in contact with someone.

Thanks!

Jake

3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…2/12

3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…3/12
Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on
provided links.
From: Danielle Zebelean <[e-mail]>
Sent: Wednesday, August 21, 2024 12:06 PM
To: Crosby, Jake <[e-mail]>
Cc: [e-mail]
Subject: Re: Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)

[Quoted text hidden]
EPA WSG Conv Definition 2009.pdf
317K
Danielle Zebelean <[e-mail]>Thu, Aug 22, 2024 at 10:10 AM
To: "Crosby, Jake" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Excellent! Yes the DAF followed by filtration doesn't give me any heartburn. The DAFF is combined in one treatment process as seen below. So that's
why it gives me pause on if it still can get conventional credits. I would greatly appreciate contact information for EPA/States that oversee New York and
Connecticut.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Crosby, Jake <[e-mail]>Thu, Aug 22, 2024 at 10:16 AMTo: "[e-mail]" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Hi Dani,

Gotcha! I learned something! I’ve never seen a DAFF system before, I thought there might be a difference from DAF followed by filtration, but I wasn’t
sure if it was just another acronym that meant the same thing 😊. Definitely tricky to know how to categorize this! I’ll see if I can get any contact info for
you.

Thanks!
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…4/12
Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on
provided links.

Jake

From: Danielle Zebelean <[e-mail]>
Sent: Thursday, August 22, 2024 10:11 AM
To: Crosby, Jake <[e-mail]>
Cc: [e-mail]
Subject: Re: Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)

Excellent! Yes the DAF followed by filtration doesn't give me any heartburn. The DAFF is combined in one treatment process as seen below. So that's
why it gives me pause on if it still can get conventional credits. I would greatly appreciate contact information for EPA/States that oversee New York and
Connecticut.
[Quoted text hidden]
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Thu, Aug 22, 2024 at 10:18 AM
To: "Crosby, Jake" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Thank you and apologies for not being clearer in my first email. This is also the first time I've seen this.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Crosby, Jake <[e-mail]>Fri, Aug 23, 2024 at 7:50 AM
To: "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery, Mark" <[e-mail]>, "Reilly, Kevin"
<[e-mail]>
Cc: "[e-mail]" <[e-mail]>, "[e-mail]" <[e-mail]>
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…5/12
Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on
provided links.
Hi All,

I received a question from the state of Utah about DAFF (dissolved air flotation over filtration), and how to categorize it. I had never heard of this
process. Basically, the DAF takes place on top of the filter beds (schematic from the state included below), instead of as a separate process. The
reference systems that use this process provided by the engineering firm are in NY and CT. Is there a way you could put the Utah regulators in touch
with someone from NY and/or CT that would be able to give them insight into how they classified this process and assigned removal credits? I went
ahead and copied the two engineers from Utah on this e-mail.

Thanks for your help!

Jake

Jake Crosby, PE |Environmental Engineer
Safe Drinking Water Branch – Rule Implementation Section | USEPA Region 8| 8WD-SD-R
1595 Wynkoop St, Denver, CO 80202
303.312.6389

From: Danielle Zebelean <[e-mail]>
Sent: Wednesday, August 21, 2024 12:06 PM
To: Crosby, Jake <[e-mail]>
Cc: [e-mail]
Subject: Re: Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)

Sorry, I realized I gave you the cities not the names of the treatment plants.
[Quoted text hidden]
[Quoted text hidden]
Crosby, Jake <[e-mail]>Fri, Aug 23, 2024 at 7:57 AM
To: "[e-mail]" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…6/12
Hi Dani,

I just e-mailed my DW contacts in EPA Regions 1 and 2. Hopefully they can put you in contact with someone from NY or CT.

One thought if you don’t receive anything. In the memo I sent, it references the preamble to the LT1ESWTR where it defines conventional filtration as,
“a treatment train using separate, sequential, unit processes for coagulation/flocculation, clarification, and granular media
filtration. Clarification includes any solid/liquid separation process following coagulation/flocculation where accumulated solids
are removed during this separate component of the treatment system.”

Since DAFF combines sedimentation and filtration into a single basin, maybe it doesn’t meet this definition? I’m guessing that
this is a gray enough area that you could get a variety of different answers. This is the issue with contact adsorption clarifier
package plants – some states call them direct filtration and others consider them conventional. Because the current regs don’t
require direct filtration plants to meet the TOC reduction requirements, which approach is more stringent really depends on the
system’s issues. Direct filtration receives lower removal credits, but isn’t required to achieve TOC reduction while conventional
filtration receives higher removal credits but also has to meet the TOC reduction requirements.
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Fri, Aug 23, 2024 at 8:58 AM
To: "Crosby, Jake" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Thank you very much Jake!
I agree we have a couple of the package plants here that are classified as alternative Direct Filtration so that they also aren't held to the raw water
turbidity limits either. Food for thought that we might need to take the discussion back to the water system and consultant.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Reilly, Kevin <[e-mail]>Fri, Aug 23, 2024 at 9:13 AM
To: "Crosby, Jake" <[e-mail]>, "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery,
Mark" <[e-mail]>, "Traviglia, Andrea" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, "[e-mail]" <[e-mail]>
Jake , It is considered by EPA as an acceptable conventional settling process. See attachment top 2nd page 2nd paragraph in particular where DAF is
typed. This question arose out of DAF/settling not being clearly defined in the original SWTR, 1989(since it was not used very much at that time). All
New England states accept DAF as conventional treatment(I believe NY, NJ, and PA do as well(from memory).
Also look at 141.2 “Sedimentation means a process for removal of solids before filtration by gravity or separation.” I believe this was added to
Definitions too at a date after the SWTR.
Kevin

PS Probably in EPA’s GM but I couldn’t pick it up quickly so went to my files.

From: Crosby, Jake <[e-mail]>
Sent: Friday, August 23, 2024 9:50 AM
To: Kwong, Ellie <[e-mail]>; Lynch, Katie (she/her/hers) <[e-mail]>; Sceery, Mark <[e-mail]>; Reilly, Kevin
<[e-mail]>
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…7/12
Cc: [e-mail]; [e-mail]
Subject: RE: Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)

Hi All,

I received a question from the state of Utah about DAFF (dissolved air flotation over filtration), and how to categorize it. I had never heard of this
process. Basically, the DAF takes place on top of the filter beds (schematic from the state included below), instead of as a separate process. The
reference systems that use this process provided by the engineering firm are in NY and CT. Is there a way you could put the Utah regulators in touch
with someone from NY and/or CT that would be able to give them insight into how they classified this process and assigned removal credits? I went
ahead and copied the two engineers from Utah on this e-mail.

Thanks for your help!

Jake

Jake Crosby, PE |Environmental Engineer
Safe Drinking Water Branch – Rule Implementation Section | USEPA Region 8| 8WD-SD-R
1595 Wynkoop St, Denver, CO 80202
303.312.6389

[Quoted text hidden]
image2024-05-23-111138.pdf
738K
Danielle Zebelean <[e-mail]>Fri, Aug 23, 2024 at 11:06 AM
To: "Reilly, Kevin" <[e-mail]>Cc: "Crosby, Jake" <[e-mail]>, "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery,
Mark" <[e-mail]>, "Traviglia, Andrea" <[e-mail]>, "[e-mail]" <[e-mail]>
Thank you Kevin,
Would you still mind connecting me to one of the state agencies in your area? Since with DAFF they are combining it into one process instead of
separate DAF followed by filtration. I would like to discuss with them what the thought process was in assigning the LRVS they did whether for
conventional or direct.
Thanks!
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…8/12
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Crosby, Jake <[e-mail]>Fri, Aug 23, 2024 at 11:07 AM
To: "Reilly, Kevin" <[e-mail]>, "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery, Mark"
<[e-mail]>, "Traviglia, Andrea" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, "[e-mail]" <[e-mail]>
Thanks Kevin! Do you consider it conventional if it is all combined in the same basin? I think the combined DAF and filtration in one step was Utah’s
concern. In the 2009 memo it refers to the LT1 Preamble which defines conventional filtration as, “a treatment train using separate, sequential,
unit processes for coagulation/flocculation, clarification, and granular media filtration. Clarification includes any solid/liquid
separation process following coagulation/flocculation where accumulated solids are removed during this separate component of
the treatment system.”
Since the DAF takes place on top of the filters, is that considered a separate, sequential, unit process or not?

Thanks!

Jake
[Quoted text hidden]
Crosby, Jake <[e-mail]>Fri, Aug 23, 2024 at 11:08 AM
To: "[e-mail]" <[e-mail]>
Thanks! I had just finished drafting a response when this came through – sorry for our e-mails crossing paths! I think we had the same question though,
so that’s good.

Thanks!

Jake
[Quoted text hidden]
Reilly, Kevin <[e-mail]>Fri, Aug 23, 2024 at 12:00 PM
To: "Crosby, Jake" <[e-mail]>, "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery,
Mark" <[e-mail]>, "Traviglia, Andrea" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, "[e-mail]" <[e-mail]>
Jake, Sort of threw me a curve with “…..DAF takes place on top of the filters,…..” Really?? It is not a
…. separate component of the treatment system.” I have not seen or heard of a …..DAF on top of the final filter bed. That is a
new one. I do not know of any of these types of units in New England.
I would be looking at that point what is the flow through the unit, gpm/square foot of the filter bed itself(not to mention the depth
of the filter and the type of media and effective size of the media(s) along with the uniformity coefficent) and what is the
overflow rate of the DAF.
This sounds more like the manufacturer and the water supplier have their work cut out to demonstrate this actually works (……
reliably and consistently produce a safe drinking water….)

Danielle, Just saw your email.
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-8631659325315…9/12
So these are the states/people I would reach out to about your questions of having DAF and the filter as part of the same unit.
Chyra, Thomas [e-mail]; Smith, Mandy [e-mail]; [e-mail]; Suozzo,
Randal [e-mail]
[e-mail]; Guterman, Damon (DEP) [e-mail]

Let us in R-1 know what you find, please.
Good luck,
Kevin
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Fri, Aug 23, 2024 at 12:09 PM
To: "Reilly, Kevin" <[e-mail]>
Cc: "Crosby, Jake" <[e-mail]>, "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery,
Mark" <[e-mail]>, "Traviglia, Andrea" <[e-mail]>, "[e-mail]" <[e-mail]>
Great thank you! Glad we are all kind of thrown for a loop with this one. The consultant provided us with four treatment plants between New York and
Connecticut that have this process.
I will keep you in the loop!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Crosby, Jake <[e-mail]>Fri, Aug 23, 2024 at 12:39 PM
To: "[e-mail]" <[e-mail]>, "Reilly, Kevin" <[e-mail]>
Cc: "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery, Mark" <[e-mail]>, "Traviglia,
Andrea" <[e-mail]>, "[e-mail]" <[e-mail]>
Thanks for the response and contact info Kevin! Definitely a unique process – it’s a first for me also!
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Tue, Mar 4, 2025 at 8:01 AM
To: "Crosby, Jake" <[e-mail]>
Cc: "Reilly, Kevin" <[e-mail]>, "Kwong, Ellie" <[e-mail]>, "Lynch, Katie (she/her/hers)" <[e-mail]>, "Sceery, Mark"
<[e-mail]>, "Traviglia, Andrea" <[e-mail]>, "[e-mail]" <[e-mail]>
Hello everyone following up on this conversation.
Thomas Chyra with Connecticut said their Stamford WTP that uses DAFF was granted conventional credits and continues to operate that way. Thomas
said that they did two seasons of piloting before going with DAFF.
When we brought this issue up with our water system and their consultant they explained to us that if the DAF is operating correctly as seen in (A)
below then it creates the separate process from the filter beds located below. Meaning the sludge blanket should get nowhere near the filter beds
below. We also had conversations on how if there is an upset, there is only one filter bed impacted instead of all the filters. Right now they are plumbed
such that their existing DAF mixes into one pipe and is distributed evenly across their filters.
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-863165932531…10/12
Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on
provided links.
So based off that, we are planning on granting them conventional credits for this.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Crosby, Jake <[e-mail]>Tue, Mar 4, 2025 at 8:20 AM
To: "[e-mail]" <[e-mail]>
Cc: "Reilly, Kevin" <[e-mail]>, "Kwong, Ellie" <[e-mail]>, "Lynch, Katie" <[e-mail]>, "Sceery, Mark"
<[e-mail]>, "Traviglia, Andrea" <[e-mail]>, "[e-mail]" <[e-mail]>
Hi Dani,

Sounds reasonable – thanks for the follow-up on where things landed, very helpful. You never know if/when this may come up in the
future!

Thanks!

Jake

From: Danielle Zebelean <[e-mail]>
Sent: Tuesday, March 4, 2025 8:02 AM
To: Crosby, Jake <[e-mail]>
Cc: Reilly, Kevin <[e-mail]>; Kwong, Ellie <[e-mail]>; Lynch, Kae <[e-mail]>; Sceery, Mark
<[e-mail]>; Traviglia, Andrea <[e-mail]>; [e-mail]
Subject: Re: Quesons about LRVS on Dissolved Air Flotaon over Filters (DAFF)

Hello everyone following up on this conversation.
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-863165932531…11/12

Thomas Chyra with Connecticut said their Stamford WTP that uses DAFF was granted conventional credits and continues to operate that way. Thomas
said that they did two seasons of piloting before going with DAFF.

When we brought this issue up with our water system and their consultant they explained to us that if the DAF is operating correctly as seen in (A)
below then it creates the separate process from the filter beds located below. Meaning the sludge blanket should get nowhere near the filter beds
below. We also had conversations on how if there is an upset, there is only one filter bed impacted instead of all the filters. Right now they are plumbed
such that their existing DAF mixes into one pipe and is distributed evenly across their filters.

[Quoted text hidden]
[Quoted text hidden]
3/4/25, 9:10 AM State of Utah Mail - Questions about LRVS on Dissolved Air Flotation over Filters (DAFF)
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-2650398767521349350&simpl=msg-a:r-863165932531…12/12
Danielle Zebelean <[e-mail]>
Reaching out for a discussion on Dissolved Air Flotation over Filtration LRVs
7 messages
Danielle Zebelean <[e-mail]>Fri, Aug 23, 2024 at 1:22 PM
To: [e-mail], "[e-mail]" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Hi Chyra and Mandy,
I am with the Utah Division of Drinking Water in EPA Region 8. Kevin Reilly in EPA Region 1 gave us your contact
information. We have a treatment plant in Southern Utah who is expanding their capacity. As part of this project they are
replacing their floc/sed basins with a Dissolved Air Flotation over Filtration process, pictured below.
The consultant working on the design told us that the Stamford WTP and Peekskill WTP in Connecticut also use this
process. I am hoping to know what LRV credits you granted for this process whether conventional or direct and what the
thought process was for assigning the credits one way or the other. It is recognized in LT2ESWTR that DAF followed by
filtration is recognized as a conventional filtration process. However where this is not a separate process and combined
into one is where we in Utah and the EPA folks are having some trouble.
We would greatly appreciate any insight you have from the two water treatment plants in your state.
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
3/4/25, 9:10 AM State of Utah Mail - Reaching out for a discussion on Dissolved Air Flotation over Filtration LRVs
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-3547913542668975566&simpl=msg-a:r533122362783716…1/5
You don't often get email from [e-mail]. Learn why this is important
Chyra, Thomas <[e-mail]>Thu, Aug 29, 2024 at 9:05 AM
To: Danielle Zebelean <[e-mail]>, "Smith, Mandy" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Dani,

Let me try to find our original approval for the plant in CT.

TOM CHYRA, P.E.
Supervising Environmental Engineer
Environmental Health & Drinking Water Branch/Drinking Water Section/West
Compliance RegionConnecticut Public Health860-936-0742
[e-mail]

From: Danielle Zebelean <[e-mail]>
Sent: Friday, August 23, 2024 3:22 PM
To: Chyra, Thomas <[e-mail]>; Smith, Mandy <[e-mail]>
Cc: Sarah Page <[e-mail]>
Subject: Reaching out for a discussion on Dissolved Air Flotaon over Filtraon LRVs

EXTERNAL EMAIL: This email originated from outside of the organization. Do not click any links or open anyattachments unless you trust the sender and know the content is safe.
Hi Chyra and Mandy,

I am with the Utah Division of Drinking Water in EPA Region 8. Kevin Reilly in EPA Region 1 gave us your contact
information. We have a treatment plant in Southern Utah who is expanding their capacity. As part of this project they are
replacing their floc/sed basins with a Dissolved Air Flotation over Filtration process, pictured below.
3/4/25, 9:10 AM State of Utah Mail - Reaching out for a discussion on Dissolved Air Flotation over Filtration LRVs
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-3547913542668975566&simpl=msg-a:r533122362783716…2/5
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Thu, Aug 29, 2024 at 11:26 AM
To: "Chyra, Thomas" <[e-mail]>
Cc: "Smith, Mandy" <[e-mail]>, Sarah Page <[e-mail]>
Thank you Thomas!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Chyra, Thomas <[e-mail]>Thu, Sep 5, 2024 at 1:35 PM
To: Danielle Zebelean <[e-mail]>
Cc: "Smith, Mandy" <[e-mail]>, Sarah Page <[e-mail]>, "Tabatabai, Alex"
<[e-mail]>
Dani,

I looked at our approval for the Stamford WTP upgrades, and we classified the stacked DAF/Filtration as a
conventional plant. I verified with the plant’s operator that they have been operating it as a conventional
plant. I am not familiar with the Peekskill WTP, but based on the name it’s probably located in upstate NY.
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Fri, Sep 6, 2024 at 9:39 AM
To: "Chyra, Thomas" <[e-mail]>
3/4/25, 9:10 AM State of Utah Mail - Reaching out for a discussion on Dissolved Air Flotation over Filtration LRVs
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-3547913542668975566&simpl=msg-a:r533122362783716…3/5
Cc: "Smith, Mandy" <[e-mail]>, Sarah Page <[e-mail]>, "Tabatabai, Alex"
<[e-mail]>
Thank you very much!
And sorry the other plant was Hemlocks WTP that was located in CT. But based off the technical memorandum the DAFF
was placed into service in 1997 so documentation may be a bit more sparse on that one.
Do you have any of the reasoning on why it was assigned conventional for Stamford? If not that’s ok!
Thanks!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Chyra, Thomas <[e-mail]>Fri, Sep 13, 2024 at 9:28 AM
To: Danielle Zebelean <[e-mail]>
Sorry for the delay in responding. I can’t remember exactly why but do remember them doing an extensive
two season pilot before they went with this design.

TOM CHYRA, P.E.
Supervising Environmental Engineer
Environmental Health & Drinking Water Branch/Drinking Water Section/LargeSystems Compliance Unit
[Quoted text hidden]

[Quoted text hidden]
Danielle Zebelean <[e-mail]>Mon, Sep 16, 2024 at 7:41 AM
To: "Chyra, Thomas" <[e-mail]>
Thank you Thomas!
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
3/4/25, 9:10 AM State of Utah Mail - Reaching out for a discussion on Dissolved Air Flotation over Filtration LRVs
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-3547913542668975566&simpl=msg-a:r533122362783716…4/5
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
3/4/25, 9:10 AM State of Utah Mail - Reaching out for a discussion on Dissolved Air Flotation over Filtration LRVs
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-a:r-3547913542668975566&simpl=msg-a:r533122362783716…5/5
Danielle Zebelean <[e-mail]>
Quail Creek WTP Expansion Phase 1 and 2 90% deliverable review
3 messages
Bird, Tyler <[e-mail]>Wed, Jan 8, 2025 at 2:45 PM
To: Danielle Zebelean <[e-mail]>, Sarah Page <[e-mail]>
Cc: "Williams, Jeremy S" <[e-mail]>, Randy Johnson <[e-mail]>
Hi Sarah and Dani,

I hope you are doing well and had a great holiday season!

We recently completed the Quail Creek WTP Expansion Phase 1 and 2 90% deliverable and would like to schedule a
time with you to review the deliverable and to go through the Phase 3 disinfection CT calcs (this is when UV gets added).
Do you have time next week for a 1 to 2 hr virtual review meeting (MS Teams)? If yes, will you please send me a couple
dates and times that work for you and I will coordinate it with our team and send out a meeting invite.

Thanks again for your help with this!

Tyler Bird, PE

Associate | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
385-342-1083 (direct) | 801-455-2168 (cell)
[e-mail] | hazenandsawyer.com

Danielle Zebelean <[e-mail]>Wed, Jan 8, 2025 at 2:58 PM
To: "Bird, Tyler" <[e-mail]>
Cc: Sarah Page <[e-mail]>, "Williams, Jeremy S" <[e-mail]>, Randy Johnson
<[e-mail]>
Hi Tyler, exciting news!
Next week it looks like Sarah and I are both available on January 14th from 2-3 pm. The following week we are available
January 21 from 2-3 pm or Wednesday January 22 from 3-5pm.
Thanks!
3/4/25, 9:10 AM State of Utah Mail - Quail Creek WTP Expansion Phase 1 and 2 90% deliverable review
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1820718798139959493&simpl=msg-f:182071879813995949…1/2
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Bird, Tyler <[e-mail]>Wed, Jan 8, 2025 at 4:29 PM
To: Danielle Zebelean <[e-mail]>
Cc: Sarah Page <[e-mail]>, "Williams, Jeremy S" <[e-mail]>, Randy Johnson
<[e-mail]>
Thanks Dani!

We will look at our calendars and send you a meeting invite.

Thanks,

Tyler Bird, PE

Associate | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
385-342-1083 (direct) | 801-455-2168 (cell)
[e-mail] | hazenandsawyer.com

From: Danielle Zebelean <[e-mail]>
Sent: Wednesday, January 8, 2025 2:59 PM
To: Bird, Tyler <[e-mail]>
Cc: Sarah Page <[e-mail]>; Williams, Jeremy S <[e-mail]>; Randy Johnson
<[e-mail]>
Subject: Re: Quail Creek WTP Expansion Phase 1 and 2 90% deliverable review

Caution! External email – think before you click
[Quoted text hidden]
3/4/25, 9:10 AM State of Utah Mail - Quail Creek WTP Expansion Phase 1 and 2 90% deliverable review
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1820718798139959493&simpl=msg-f:182071879813995949…2/2
Danielle Zebelean <[e-mail]>
QCWTP disinfection strategy
7 messages
Williams, Jeremy S <[e-mail]>Thu, Jan 23, 2025 at 2:56 PM
To: Sarah Page <[e-mail]>, Danielle Zebelean <[e-mail]>
Sarah and Dani,

Thanks for meeting with us earlier this week to discuss the disinfection strategy for the QCWTP. I have some
questions/concerns about what’s being requested and would like to meet with you two to make sure I understand our next
steps.

Are you available the afternoon of the 27th that I could swing by your office? If not, please let me know some dates/times
that would work for you.

Thanks,

Jeremy Williams, PE
Associate Vice President | Project Manager | Hazen and Sawyer
10619 South Jordan Gateway, Suite 130, South Jordan, UT 84095
(direct) 385-342-1082 | (cell) 801-885-2060
www.hazenandsawyer.com

Danielle Zebelean <[e-mail]>Fri, Jan 24, 2025 at 9:51 AM
To: "Williams, Jeremy S" <[e-mail]>
Cc: Sarah Page <[e-mail]>
Hi Jeremy,
Absolutely we’d love to discuss with you. Unfortunately we are not both available at the same times on the 27th in the
afternoon. We both have time on our calendars for the 30th from 2-3pm. I will be in the office and can have our OWL set
up for Sarah to join virtually.
Let me know if that works for you or if there are other times.
Thanks!
3/4/25, 9:10 AM State of Utah Mail - QCWTP disinfection strategy
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1822078424598322002&simpl=msg-f:182207842459832200…1/3
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Fri, Jan 24, 2025 at 11:50 AM
To: Danielle Zebelean <[e-mail]>
Cc: Sarah Page <[e-mail]>
Rats, I’m tied up on the 30th.

How about the following week, 3rd or the 4th?

From: Danielle Zebelean <[e-mail]>
Sent: Friday, January 24, 2025 9:52 AM
To: Williams, Jeremy S <[e-mail]>
Cc: Sarah Page <[e-mail]>
Subject: Re: QCWTP disinfecon strategy

Caution! External email – think before you click
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Fri, Jan 24, 2025 at 12:12 PM
To: "Williams, Jeremy S" <[e-mail]>
Cc: Sarah Page <[e-mail]>
The 3rd we are both free after 3pm. I’ll be presenting at the rural water all day training on the 4th.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
3/4/25, 9:10 AM State of Utah Mail - QCWTP disinfection strategy
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1822078424598322002&simpl=msg-f:182207842459832200…2/3
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Fri, Jan 24, 2025 at 12:23 PM
To: Danielle Zebelean <[e-mail]>
Cc: Sarah Page <[e-mail]>
Awesome, the 3rd at 3:30 PM then? Let me know if you’re in the office or need a Teams link.

Thanks,
Jeremy
[Quoted text hidden]
Danielle Zebelean <[e-mail]>Fri, Jan 24, 2025 at 12:52 PM
To: "Williams, Jeremy S" <[e-mail]>
Cc: Sarah Page <[e-mail]>
That works! I’ll be in the office that day, Sarah will still be virtual. I’ll send a calendar invite with the room reservation. If you
wouldn’t mind, can you send some quick thoughts covering what you’d like to discuss?
On the day of, let me know when you make it to the Multi Agency State Office building and I’ll meet you on the third floor
to check you in.
Dani Zebelean, P.E.
Environmental Engineer III | Division of Drinking Water
M: [phone]
Hours: M - Th 7 am to 5 pm
drinkingwater.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
[Quoted text hidden]
Williams, Jeremy S <[e-mail]>Fri, Jan 24, 2025 at 2:04 PM
To: Danielle Zebelean <[e-mail]>
Cc: Sarah Page <[e-mail]>
Yes – specifically, I want to understand the State’s requirements for virus credits. I think we understand the
code differently than it’s being applied to the QCWTP project, so I’d like to go through that with you both and
make sure we’re both on the same page as to what the code says and to how it’s being applied.

I’ll be prepared with Federal and State codes, and then if we could walk through that together it would be
very helpful.
[Quoted text hidden]
3/4/25, 9:10 AM State of Utah Mail - QCWTP disinfection strategy
https://mail.google.com/mail/u/0/?ik=82c167e5f1&view=pt&search=all&permthid=thread-f:1822078424598322002&simpl=msg-f:182207842459832200…3/3