ST8504-CS 851021GINN, INC.
CONSULTING ENGINEERS
October 21, 1985
Ms. Janet Vick
Nathan D. Maier Consulting Engineers
Three Northpark
8800 N. Central Expressway, %300
Dallas, Texas 75231
Re:
Riverchase Drive Improvements (Final Plat)
Coppell, Texas
Dear Ms. Vick:
We have reviewed this submittal for conformance to City of Coppell
Subdivision Ordinance and Zoning Ordinance and the following sets
forth our comments. Prior to placing this on the November 21, 1985
P & Z Agenda for final plat approval, please address the following
items:
Riverchase Drive is considered a minor arterial thoroughfare
since it interconnects with major arterials on both ends,
Sandy Lake Road on the north terminus and MacArthur Boulevard
at the southern terminus.
The design speed for a minor arterial is 35 - 45 MPH. The
minimum centerline radius for this design speed would be 600'.
Presently the radius is designed as 510'. The City will have
to regulate the speed limit to 30 - 35 MPH, but since this is
a minor arterial, people will tend to exceed that limit;
therefore, consideration should be given to increasing the
radius to 600 feet minimum. Please address.
Please provide us with a current set of plans for review.
A. Have engineer's seal on plans.
B. Provide a vicinity map.
C. Indicate box culvert alignment and details, west of
MacArthur Boulevard to coincide with recently submitted
box culvert details.
D. Indicate which drainage criteria are used.
E. Recommended maximum velocities of 12.5 f.p.s, has been
exceeded in some of the storm sewers.
F. Indicate headwall details.
G. Indicate box culvert design and bedding details.
H. Include your standard detail sheets.
If you have any questions, please contact us.
Sincerely,
Gabe Favre
cc:
Steve Goram Vivyon Bowman
16135 Preston Road · Suite 106 · Dallas, Texas 75248 · Phone 214/386-6611