ST9401-CS 950324
M E M 0 RAN DUM
TO:
Tom Baker
S1'C14-0\
FROM: Ulys Lane
DATE: 3-24-95
SUBJECT: DENTON TAP ROAD; COPPELL, TEXAS
W&A NO.: 94093
I reviewed your proposal to Ken Griffin and wish to confirm that
we will need some slope stability analysis. We will be
constructing a paved 16' wide hike and bike trail between the
outside bridge piers and the bridge abutment. This will occur on
both sides of the bridge. There will be a concrete rip-rapped
slope from the edge of the hike and bike trail to the bridge
abutment. The slope will be about 8' high. The section we
provided to you of the bridge indicates the hike and bike trail
concept. We will need to determine the riprap slope for design
of the bridge opening width. We will use a 2:1 slope if it is
stable and flatter slopes if needed. Also, we will riprap around
the end of the bridges up to the normal earthen fill slope at the
bridge abutment. We will need to know the maximum safe slope for
the bridge embankment. We anticipate a maximum 3:1 slope will be
considered. We may use a maximum 4:1 slope if there is room so
the slope can be easily mowed. Based on existing creek overbank
grades near the bridge area at elevation 460 and the anticipated
top of bridge elevation of 469, we anticipate the earthen slopes
to be 10' high or lower.
!
The slope analysis is an additional service in your report. We
would ask that you give Ken Griffin an idea of the costs to
provide the information described above.
End of Memo
Copy to: Ken Griffin
Fax #
Fax #