DDW-2024-007569

May 13, 2024
Teresa Gray
Salt Lake City Water System
1530 South West Template
Salt Lake City, Utah 84115
Subject:Exception to R309-550-7(1)Minimum Separation Requirements for TAG SLC Glendale Townhomes located at 1490 W North Temple St., Distribution System (DS001); Salt Lake City Water
System, System #18026, File #14230
This letter is not Plan Approval for construction.
Dear Teresa Gray:
On May 01, 2024, the Division of Drinking Water (the Division) received your request and a completed Plan Review Checklist — Minimum Separation Standards for Water and Sewer Linesfor
an exception to Rule R309-550-7(1), Separation of Water Mains and Sewer Lateral from Sewers and Other Pollution Sources for UTAH18026 Distribution System (DS001). This rule states specifically
that the horizontal distance between pressure water mains and sanitary sewer lines shall be at least ten feet and that where a main and a sewer line must cross, the water main shall
be at least 18 inches above the sewer line.
Exception Request
SLC Public Utilities (DPU) is going to install a new 8-inch diameter PVC SDR-35 sewer lateral for the TAG SLC Glendale Townhomes project to cross only 10 inches under a 12-inch diameter
PVC public water main on Cornell St. north of North Temple St. at 1490 W North Temple St., Salt Lake City.
The TAG SLC Glendale Townhomes development requires an 8-inch diameter sewer lateral connection to the existing public sewer main in Cornell Street which runs under the existing water
main with only 10 inches of vertical clearance instead of 18 inches as required by the rules. The adjacent "Gauge" development installed a 12 inch diameter PVC water line in Cornell
Street, deeper than expected, raising concerns for the sewer connection. After assessing, the only feasible path for the sewer lateral was found just north of a dry utility conduit bank
on the north side of North Temple Street, where the water main dips deeper before a storm drain crossing. To maintain clearance below the water line, the sewer lateral must pass underneath
with 10 inches of clearance, necessitating a variance due to existing utility configurations and conflicts.
To meet the intent of the rule, you propose the following measures to provide equivalent protection for public health:
The utilities will cross perpendicular to each other.
Provide a steel casing over the 8-inch diameter sewer lateral extending 10 feet beyond the crossing on both sides, with no joints allowed in the casing.
The steel casing is ASTM type for the steel material, spacer configurations, and the details of the overlapping rubber pull-on end seal for both ends of the steel casing.
Groundwater is not expected to be encountered as it is expected to be from 7.2 feet to 8.8 feet below the ground surface and should not affect utility trenches during installation.
On this basis, an exception to R309-550-7(1), Separation of Water Mains and Transmission Lines from Sewers and Other Pollution Sources, is hereby granted for TAG SLC Glendale Townhomes
development sewer installation.
This exception may be rescinded at 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.
Please maintain a copy of this letter with your permanent records for future reference
If you have any questions regarding this exception, please contact Nagendra Dev, P.E., of this office, at [phone], or me, at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
ND/mrn/mdb
cc:Matthias Neville, Salt Lake County Health Department, [e-mail] Gray, Salt Lake City Public Utilities, [e-mail] Denning, Salt Lake City Public Utilities,
[e-mail] Beitel, Salt Lake City Public Utilities, [e-mail] Farshid, Salt Lake City Public Utilities, [e-mail] Dev, P.E.,
Division of Drinking Water, [e-mail]
NDev 18026 14230 Exception Granted