DDW-2025-006603

CAUTION: [EXTERNAL] This email originated from outside of AE2S. Do not click links or open attachments unless you
recognize the sender and know the content is safe.
J. Paul Wright <[e-mail]>
Toquerville Springs to Virgin PS project (File #22679) Plan Review Comments
Sam Fankhauser <[e-mail]>Wed, Jul 16, 2025 at 5:52 PM
To: "J. Paul Wright" <[e-mail]>
Cc: Casey Skillingstad <[e-mail]>, George Elliott <[e-mail]>, Jadee Adams
<[e-mail]>
Hi Paul,
Thanks for your review. Answers below.
Sam Fankhauser, PE
Operations Manager II
Mobile: [phone]
From: J. Paul Wright <[e-mail]>
Sent: Wednesday, July 16, 2025 3:47 PM
To: Sam Fankhauser <[e-mail]>
Cc: Casey Skillingstad <[e-mail]>; George Ellio <[e-mail]>; Jadee
Adams <[e-mail]>
Subject: Toquerville Springs to Virgin PS project (File #22679) Plan Review Comments
Sam,
I have reviewed the plans for the Toquerville Springs to Virgin Pump Station Project and I have the following questions.
1) Pressure gauges for Pump Staon are shown on Sheet P601 of the Pump Staon plans. In the
specificaons, it only calls out gauges. For the sucon side gauge, however, it should be a compound gauge,capable of measuring posive and negave pressure. The discharge side gauge can be a standard gauge.
The pressure measurement assembly will be equipped with a pressure gauge and pressure transmier. Thepressure transmier is a Rosemount 2088 equipped with a pressure range of -14.7 to 800 psi. Below is thedetail provided by the prefab manufacturer.
7/17/25, 4:58 PM State of Utah Mail - Toquerville Springs to Virgin PS project (File #22679) Plan Review Comments
https://mail.google.com/mail/u/0/?ik=f3bcb897f8&view=pt&search=all&permmsgid=msg-f:1837849583759445381&simpl=msg-f:1837849583759445381 1/3
2) I just want to verify that there will be three (3) pumps. Each one with a 1,000 gallon per minute pump
capacity, 100 hp, at 500 feet of head (based on how I read the specificaon)? . So, with two pumps in
operaon according to the plans, the plant will have a total capacity of 2,000 gpm? The PNF says 1,000 gpmcapacity only, so please clarify this. I also assume this is to just move water into the transmission line that
delivers water to Virgin and La Verkin and it isn’t to be used to maintain pressure for any part of a water
system.
There will be three (3) pumps each with a 500 gpm capacity at 500’ TDH. The pump staon will run two
pumps to provide 1,000 gpm. So staon firm capacity is 1,000 gpm. The three pumps will rotate between
lead, lag, and standby. The pump staon is designed to deliver water to the Coam Tanks not to maintainpressure in the distribuon system. Also, you aren’t specific about pump type yet, it only calls out vercal inline (centrifugal I assume) or vercalturbine. We will need to have this clarified in the as built drawings or sooner.
The pumps are vercal inline, mulstage centrifugal pumps from Grundfos.
3) All materials/equipment that come into contact with drinking water shall be ANSI/NSF 61 cerfied. Many
of the valves, components, piping, and coangs show this requirement in the specificaons. However, I couldnot find this requirement for the pumps themselves.
The specificaons do not specifically call out that requirement for the pumps themselves. Because the
specificaons call out all interior process piping to be NSF 61 by default the pumps connected to the processpiping must meet the same requirements. The pump submial contains approvals for NSF 61 (see aached).
4) I want to clarify that the building/enclosure will be pre-manufactured, hence the reason no building planswere included? The specificaons seem to read this way.
Yes, the pump staon will be a pre-manufactured building. The manufacturer’s building plans are aached foryour reference.
5) On the foundaon plan, a drain is shown. I just need to ensure that the drain will be a drain to daylightsince no site plan was provided.
Yes, the site plan describes the drain as daylighng with a rodent screen on the outlet (Sheet C303).
6) The plans call out two air release valves on Sheet P601 of the pump staon plans. The specificaons saythat they should be piped to the floor drain in Secon 33 14 43-18. The Division of Drinking Water (Division)rules only allow the piping to come as close as 6 inches from the floor and the end of the piping from the airvalve needs to be covered with a #14 mesh screen. This should be shown in a detail or clarified in the
specificaons.
7/17/25, 4:58 PM State of Utah Mail - Toquerville Springs to Virgin PS project (File #22679) Plan Review Comments
https://mail.google.com/mail/u/0/?ik=f3bcb897f8&view=pt&search=all&permmsgid=msg-f:1837849583759445381&simpl=msg-f:1837849583759445381 2/3
We will update the specificaon and send the revised version to you.
7) For the trench detail in the pipe plans and in the pipe specificaons, I could not find the specific pipe
zone soil material required. The specificaon in Secon 31 23 33 just say to adhere to Toquervillespecificaons. Since those have not been approved by the Division, I don’t know what those are. The
requirement in the Division’s rules is ¾” minus soil material for plasc pipe and 1” minus for ducle iron. This
should be shown in the trench detail or in that secon of the specificaons.
Table 4.1 in Toquerville’s specificaons indicates similar requirements. We will update the specificaon toinclude this table and send the revised version to you.
[Quoted text hidden]
2 attachments
Page 20 of 426_Toquerville PS Submittal 25-26-01X.pdf
150K
Toquerville PS Building Plans.pdf
891K
7/17/25, 4:58 PM State of Utah Mail - Toquerville Springs to Virgin PS project (File #22679) Plan Review Comments
https://mail.google.com/mail/u/0/?ik=f3bcb897f8&view=pt&search=all&permmsgid=msg-f:1837849583759445381&simpl=msg-f:1837849583759445381 3/3