DDW-2024-008728

18026 14527
Salt Lake City WS
925 S 4400 W Building Addition
BRYAN K SCHMUTZ
4777990 CIVIL ENGINEER
[e-mail] [phone]
ADVANCED CIVIL ENGINEERING, PLLC
6/27/24
Rebecca Yoo 6/28/2024
Michael Newberry, P.E.
Install a proposed 8" sewer lateral 0.57' under the existing 12" PVC
water main.
Sewer shall be PE3408 fused HDPE DR17 with flexible gasketed
joints at the manholes. Includes leakage test, deflection test, and
video inspection
Matthias Neville, Salt Lake County Health Department, [e-mail]
Bryan Schmutz, Advanced Civil Engineering, [e-mail]
Teresa Gray, SLC Water System, [e-mail]
Rebecca Yoo, Division of Drinking Water, [e-mail]
Water/Sewer Separation - Exception Request Spreadsheet
STA 76+52 4400 West
Constraint due to existing water main and gravity sewer elevation.
Perpendicular crossing
0.57 feet
Above
18" below water main
Condition (New/Existing)Existing 1996
Material PVC
Size 12"
Pressure Rating 150 psi (107 static)
Is the line pressurized year-round?Yes
Condition (New/Existing)Proposed 2024
Material fused HDPE DR17
Size 8"
Pressure Rating 150 psi
Is the line pressurized?No
Maintain existing water main in place without adding additional joints in the
area; Sewer shall be PE3408 fused HDPE DR17 with QC testing per DEQ;
add magnetic warning tape 12" above water and sewer lines
1. Separation distances shall be measured edge-to-edge.
2.     Examples of proposed means to mitigate risks include:
a.     remove/replace the aged vitrified clay sewer pipe;
b.     replace the aged or cracked existing sewer pipe;
c.      use thicker or higher pressure class PVC instead
d.     of the typical thin-wall sewer pipe; install an in-situ lining to the existing sewer pipe for XX feet;
e.     center the sewer line over the crossing to keep the joints as far as possible from the water line;
f.      add detectable or magnetic warning tape placed 12 inches above the sewer and/or the water line(s) to minimize possible damage during future excavations;
g.     use HDPE pipe for water line or sewer line to eliminate the joints [if there is no sagging or lack-of-sufficient slope problems for HDPE sewer pipes];
h.     use restrained joints for water line and/or sewer line near the crossing
Sewer
Line
Water
Line
Reason for not meeting R309-550-7
Mitigation Efforts2
Station or Location
Horizontal Clearance1
Vertical Clearance1
Water is Above or Below Sewer
Groundwater conditions