DDW-2024-014723

December 24, 2024
Pat McCluskey
Bridge Hollow Water Association
800 Bridge Hollow
Wanship, Utah 84017
Subject:TemporaryException to R309-515-6(2), Standby Power;
Bridge Hollow Water Association, System #22117, File #12811
This Temporary Exception Expires on January 1, 2028.
Dear Pat McCluskey:
On December 19, 2024, the Division of Drinking Water (the Division) received your request for an extension to the temporary exception issued on December 3, 2021, to Rule R309-515-6(2)
regarding standby power for your sources. According to this rule, if a community water system has no naturally flowing water sources such as springs or flowing wells, one or more of
the system’s sources shall be equipped for operation during power outages. In this event, to ensure continuous service when the primary power has been interrupted, a redundant power
supply shall be provided. A redundant power supply may include a transfer switch for auxiliary power such as a generator or a power supply service with coverage from two independent
substations.
It is our understanding that your water system consists of the following facilities:
Bridge Hollow Well (identified as WS003 in the Division’s database)
Well 3 (WS004)
7K Wet Well and Pump #1 (PF001)
1K Wet Well and Pump #2 (PF002)
1K Wet Well and Pump #3 (PF003)
Bridge Hollow 250K Tank (ST001)
Well 3 (WS004) is your primary source and supplies water to the Bridge Hollow 250K Tank (ST001) through two pump stations (PF002 and PF003). The Bridge Hollow Well (WS003) and Pump #1
(PF001) provide a redundant source and are typically inactive. A backup power system to deliver water to the tank in the event of a power outage would need to include three separate
diesel generators. The estimated cost is $82,000 for three generators, transfer switches and installation.
Exception Request
The basis for your request for an exception to R309-515-6(2), Standby Power, is that it is not economically feasible to purchase and install a backup power system to support the three
pumps. You propose the intent of the rule is met based on the following information:
A backup power source has not been needed during the past 30 years operating as a water system.
There was one incident where your pumps were not working for three weeks, and water demands, including fire storage requirements, were met through the 250,000-gallon storage tank.
Your system consists of 42 connections, which equates to an average day demand of approximately 20,546 gallons for indoor and outdoor use based on Division capacity requirements and
system-specific irrigation estimates.
Water usage is metered and recorded monthly, which shows a much lower average day demand of approximately 4,850 gallons.
The Bridge Hollow 250K Tank (ST001) delivers water to the system through gravity and levels are monitored daily.
Based on set points, the tank is maintained at a minimum volume of 234,500 gallons, which would provide 174,500 gallons of water to support system demands at the time of a power outage,
while maintaining the minimum fire storage requirement of 60,000 gallons.
Based on metered data, this would support the system demands for approximately 35 days.
Water conservation measures would be implemented in the event of a power outage longer than a few weeks.
On this basis, a temporary exception to R309-515-6(2), Standby Power, is hereby granted for Bridge Hollow Water Association subject to the following conditions:
This Temporary Exception expires on January 1, 2028.
Continue to monitor and maintain water levels in the Bridge Hollow 250 K Tank (ST001) and report any power outage events that may occur and provide a summary to demonstrate how system
demands were met through the storage tank.
You will be required to re-submit an exception request along with confirmation that all conditions outlined in this temporary exception have been fulfilled and obtain an exception renewal
prior to January 1, 2028.
Exceptions granted by the Division include an expiration date to ensure that the basis and conditions for granting the exception are verified periodically and that the drinking water
quality remains protected. After receiving your request, the Division will determine whether this exception can be re-issued.
Failure to request the re-evaluation of this exception and obtain an exception renewal by January 1, 2028, will result in the activation of the deficiency related to not having a backup
power source.
This Temporary Exception may be rescinded any time if new evidence indicates that the conditions of this exception are no longer being met or a public health risk exists due to this
exception.
The issuance of this exception temporarily resolves your water system’s deficiency related to not having standby power (S033). An updated IPS report is available at https://waterlink.utah.gov.
Please contact Jennifer Yee at [phone] or [e-mail] for questions related to your water system’s IPS report or deficiencies.
Please maintain a copy of this letter with your permanent records for future reference.
If you have any questions regarding this temporary exception, please contact Julie Cobleigh, P.E., of this office, at [phone], or Michael Newberry, P.E., Engineering Manager, at
[phone].
Sincerely,
Russell Seeley, P.E.
Assistant Director
JJC/mrn/mdbcc:Nathan Brooks, Summit County Health Department, [e-mail] McCluskey, Bridge Hollow Water Association, [e-mail] Cobleigh, Division of Drinking
Water, [e-mail] Yee, Division of Drinking Water, [e-mail] Dev, Division of Drinking Water, [e-mail] 22117 12811 Except