North Gateway 9-CS090618Preliminary plan review comments for
North Gateway Center
Northwest Corner of SH 121 and Denton Tap
City of Coppell
June 18, 2009
I do have a major problem and some minor one. My major problem is the existence of an
TxDOT drainage structure just to the west of driveway, this will create a major safety
issue for driveways. When I was talking back in Apri109 with Mr. Don Harrelson, P.E.
he recommends to extend the existing TxDOT box culvert and cover the ditch. However
your plan didn't talk above important issue.
Now my minor comments;
• Plan Sheet C-4
1. Show ROW line
2. We need to have 50' minimum stacking distance. Show stacking distance
on plan
3. Do we have side walk?
• Plan Sheet C-6 & C-8
1. Show match line.
• Plan Sheet C-10 & C-11
1. Where this sheet is referring to? Show match line. If location is within
TxDOT ROW show TxDOT ROW. You may use a similar to your plan
sheet C-1 for sheet references
• Plan Sheet C-14;
1. Change width of sidewalk on your note 6 from 4' to 5'
2. Add stop bar and stop sign for drivers leaving the property to W.B. SH 121
service road.
3. Add ONE WAY sign to far side of service road for driveway exiting the
property
4. Add detail of joint connecting new paving (deceleration lane/driveway) to
paving structure of existing SH 121 service road. Please next to your detail
add a note that read "Drill holes with a coring type bit. No impact drills are
allowed (they tend to fracture the adjacent pavement). Blow holes clean and
coat with approved epoxy (or other approved method). Insert one-half of the
36-inch long 3/a-inch tie bars into the existing pavement 36" O.C., 18 inches
from the ends"
• Plan sheet C-15;
1. Show plan profile of proposed 42"RCP. Show detail of connection
between existing and proposed 42" RCP, the connection must be sealed
and have concrete collar. I am recommend you try to co connect to the
back of inlet box which is simpler.
2. Show two tables for water coming to each inlet before and after
development. Post development drainage can not exceed preconstruction,
or you need justify our inlets are adequate. Please use TxDOT joint).