DDW-2024-008763

J. Paul Wright, P.E. June 9, 2024
Michael Newberry. P.E.
6/10/2024
Water/Sewer Separation - Exception Request Spreadsheet
STA 20+87 (sheet C-PP5)
Existing sewer is only 4.75' deep and water line cannot cross over because of bury depth requirements
10'
18"
Below
None
Condition (New/Existing)New
Material C900 PVC
Size 8"
Pressure Rating 11
Is the line pressurized year-round?Yes
Condition (New/Existing)Existing
Material SDR-35 PVC
Size 8"
Pressure Rating Unknown
Is the line pressurized?No
Water line will be wrapped in Trenton Guard-Wrap
wax tape installed 10' upstream and 10' downstream
of the existing sewer line crossing.
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