DDW-2024-007161

Mountain Regional Water Special Service District
6421 North Business Park Loop
Suite A
Park City, UT 84098

April 5th, 2024

Utah Division of Drinking Water
P.O Box 144830
Salt Lake City, Utah 84114

To whom it may concern,

Mountain Regional Water Special Service District (MRW, PWS 22137) is requesting an
exception for an Individual Home Booster Pump for Lot 146B in the Colony Subdivision in Park
City, Utah. This request is the second (and final) lot in the Colony Subdivision that requires its
own booster pump station. The exception for the first parcel was reviewed by the Division of
Drinking Water (DDW) under file number 11281.

The citations of the specific rules for which the exception is being requested are Rule R309-550-
11(3), R309-540-5(4)(c), and R309-105-9(3). To summarize these rules, individual home
booster pumps shall not be allowed for individual service from the public water supply mains.
Lot 146B is located within MRW’s service area; however, the service pressure delivered to the
site is below the required minimum pressures per R309-105-9(2) due to its high elevation. The
District proposes to use an individual home booster pump to provide adequate level of service
to this home, while still protecting public health in the District.

This is a rare circumstance for MRW (which was identified during the platting process with the
Colony). MRW does not anticipate any other similar facilities, however these two lots in the
Colony will require home booster pumps for service from the District. Fire protection can be
provided by a fire hydrant located within appropriate distance to the home, and has been
approved by the Park City Fire District – which MRW independently verified.

The proposed design calls for installation of a homeowner owned and operated tank and
booster pump station downstream of the MRW service meter. There are multiple layers of cross
connection control (CCC), the critical which are as follows:
• Provisions are in place for District to inspect the entire facility annually as part of our
ongoing enforcement included in our CCC Program (including backflow assemblies,
booster pumps, and tank) with a separate entrance for District staff to inspect (see
attached design drawings).
• If at anytime, there is an issue with the CCC on site, it is within District Rules and
Regulations to suspend service to this home – which can be done at the meter pit
location, not located in the Customer’s booster pump station facility.
• There is a 18-inch air gap provided betweeen the water service lateral (and the District’s
distribution system) and the storage tank located on the property. While this tank
building is partially buried on site, there is a 4-inch drain to daylight provided to mitigate
risk of the building flooding.
• There is also an inline, testable, double check valve on the water service lateral prior to
the airgap.

Given these precautions, MRW proposes this design will protect public health to an equivalent
degree as UAC R309-550-11(3), R309-540-5(4)(c), and R309-105-9(3).

Should the Division of Drinking Water have any questions about this request, please reach out
to me directly. My phone number is [phone] and my email address is
[e-mail].

Sincerely,

Sam Grenlie, P.E., M.S.
District Engineer