Riverchase(5)-CS 881222 COPPELL PUBLIC WORKS
14E~ORANDUM
December 22, 1988
TO: Steve Goram, Director of Public Works
FROM: Steven M. Morton, Chief Public Works Inspector
RE: Riverchase Drive Phase I
Steve, on Monday; 12/19/88, I was asked to attend a meeting with
Russ, Shohre, Paul Lipscomb, Clyde Sifford of DeShazo, Starek
& Tang. The topic of discussion was the 15" sanitary sewer and
its tie-in to the TRA Truck Main. This meeting was primarly
dealing with Civil Engineering Design Concepts & Standards.
In summary, TRA's line is presently running 3/4 full, which
submerges the 15" Riverchase line causing sewage to backup into
line approximately 500', which will cause solids to build up
in 15" sanitary sewer until it restricts pipe and causes water
.velocity to increase (scouring point). Several points were also
discussed such~.as the 15" line is infact an oversized line. TRA
is restricting flow so they can better meter wastewater.
Increasing size of pipe and slope of pipe.
It is ~ understanding..that the problem is and will continue
to beTR~'s line flowing at a low volicity and being undersized
for present and more so future load. Any line tieing into this
line will haye the same~ p~oblem. Until TRA either constructs
a larger line or takes res'traction out of mete~ station and allows
more wastewater to pass through to lower its .level in pipe and
increase its velocity. Shohre made the comment that in talking
to TRA, that they were aware of their line capacity problem and
know that they will sometime in the future have to increase it
but had no idea ~f how 'far in the future it would be.
In closing, I believe Russ should be comi'ng forward with his
recommendations, probably after the holidays.
SMM/bb