DDW-2025-005780

J. Paul Wright <[e-mail]>
Quail Mesa Subdivsion - Virgin Town Water System (File #18323)
J. Paul Wright <[e-mail]>Mon, Dec 16, 2024 at 11:27 AM
To: Zachery Isaac <[e-mail]>, [e-mail], [e-mail]
Cc: Brandee Walker <[e-mail]>, [e-mail], "Beers, Robert" <[e-mail]>
Zachery,
I have reviewed the plans for the Quail Mesa Subdivision water line project for the Virgin Town Water System (27020). I
have the following review comments or questions.
1) Could you let me know the length of pipe, pipe size and pipe type that will be added to the water system as a part of
this project (ie, 1,000 LF of 12-inch PVC C-900 pipe)
2) In the water report that shows the results of the hydraulic modeling, you indicated that for the fire flow + peak day
demand scenario, the minimum pressure is 20.2 psi with 1,000 gpm of fire flow at Node J-21, but in the Table of results in
Appendix B, Node J-22 actually shows a pressure of 15.88 psi, which is lower than 20 psi. The requirement is that all
nodes need to be 20 psi or above. This would then allow a fire flow lower than 1,000 gpm. This should be explained or a
letter from the fire authority allowing a lower fire flow needs to be submitted.
3) Sheet C8 of the plans shows a couple of standard trench details. The following items have not been detailed in the
plans, nor could I find them in the standard specifications:
a) The pipe zone backfill soil material needs to be specified. For plastic pipe, this needs to be at least 3/4" minus
material
b) The required burial depth for the pipe has not been specified.
4) It appears the standard specifications describe the water/sewer line separation requirements on Sheet 14. I just want
to make sure that is referenced in the plans to ensure those separation requirements are met. Any deviation from this
may require an exception from the Division of Drinking Water.
5) I saw that disinfection requirements were specified in the standard specs, but pressure testing requirements were only
mentioned and I could not find where pressure testing is explicitly described (methodology, pressure testing requirements,
etc.). Please add this to the specifications or show where that is outlined.
Let me know if you have any questions.
Paul
On Mon, Dec 16, 2024 at 10:08 AM J. Paul Wright <[e-mail]> wrote:
Zachery,
The Division of Drinking Water has received your submission for the water line review for the Quail Mesa Subdivision.
This project will be reviewed by J. Paul Wright, P.E. (me), DEQ Southwest District Engineer. The project has been
assigned file #18323.
After I have had a chance to review it, I will let you know if I have any questions or review comments.
Paul
On Fri, Dec 13, 2024 at 2:29 PM Zachery Isaac <[e-mail]> wrote:
Paul,

12/16/24, 11:27 AM State of Utah Mail - Quail Mesa Subdivsion - Virgin Town Water System (File #18323)
https://mail.google.com/mail/u/0/?ik=f3bcb897f8&view=pt&search=all&permmsgid=msg-a:r3622138003822518050&simpl=msg-a:r3622138003822518…1/3
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Per our conversation about the water line review for Quail Mesa located in Virgin Utah, attached are the following
documents for DWQ review.

Project notification form
Water report with output tables in appendix (reviewed and accepted by current city engineer Rod Mills)
Construction drawings (reviewed and signed by current city engineer Rod Mills)
Virgin Town water design specifications and standards

Let me know if you need any additional information.

Thanks,

Zach Isaac, E.I.T
c] 385 243 4132 | o] 435 986 00100 x325 w
[e-mail]
1453 S Dixie Drive, Ste 150 | St. George, UT 84770

--
J. Paul Wright, P.E. | District Engineer | Southwest Utah District
435.986.2590 (office) | 435.680.0163 (cell) | 435.986.2595 (fax)
620 S 400 E #400, St. George, UT 84770
DEQ WEBSITE
Emails to and from this email address may be considered public records and thus subject to Utah
GRAMA requirements.
--
J. Paul Wright, P.E. | District Engineer | Southwest Utah District
435.986.2590 (office) | 435.680.0163 (cell) | 435.986.2595 (fax)
620 S 400 E #400, St. George, UT 84770
12/16/24, 11:27 AM State of Utah Mail - Quail Mesa Subdivsion - Virgin Town Water System (File #18323)
https://mail.google.com/mail/u/0/?ik=f3bcb897f8&view=pt&search=all&permmsgid=msg-a:r3622138003822518050&simpl=msg-a:r3622138003822518…2/3
DEQ WEBSITE
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA requirements.
12/16/24, 11:27 AM State of Utah Mail - Quail Mesa Subdivsion - Virgin Town Water System (File #18323)
https://mail.google.com/mail/u/0/?ik=f3bcb897f8&view=pt&search=all&permmsgid=msg-a:r3622138003822518050&simpl=msg-a:r3622138003822518…3/3