ST9301-CS 960520The City With A Beautiful Future
P.O. Box 478
Coppell, Texas 75019
214-462-0022
May 20, 1996 ,
Abel Saldana P'E" Pr°ject Engineer''~/
Dallas County Public Works ~ ~ ~"[-"~[r'C
411 Elm Street ~ ,--~ ~-~ ~t 0t"~-,. C~
Dallas. Texas 75202 ~ ~,.,.0' $ 0-.43,~
RE: Sandy Lake Road Project / ST 93 01
Dear Mr. Saldana:
The City of Coppell has received and reviewed the referenced plans and has the following comments
to offer:
1. As part of this project a sanitary sewer line is to be designed from MacArthur Blvd. east to the
Sandy Lake Road lift station.
2. At the beginning of the project on the north side of the road there will be an existing driveway
for the Kroger Store that needs to be shown on these plans. I have provided a copy of the
dimensional control plan to show the approximate location. If you need additional information
please contact me.
3. Is the ownership shown on Sheet 6 on the south side of the road correct? Doesn't this belong
to the City?
4. The right-of-way comer clip shown at the northwest comer of the MacArthur Blvd. and Sandy
Lake Road intersection was dedicated when the Kroger property was platted. I have included
a copy of this plat for your use.
5. Indicate the location of new pull boxes and conduit for the proposed upgrade of signal lights
at the MacArthur Blvd./Sandy Lake Road intersection and the future signal light at Riverchase
Drive/Sandy Lake Road intersection.
6. The City would like to discuss the possibility of eliminating the most westerly driveway on
Sandy Lake Road for the Stop-in-Go and relocate it on MacArthur Blvd. Also, the City would
like to look at a possible right turn lane for east bound traffic turning north onto MacArthur
Blvd. (see Sheet 7).
7. There is a question on how the parking lot for the retail strip located at the northwest comer
of Kimbel Court and Sandy Lake Road drains. Please provide a drainage plan showing how
the site will drain when the road is raised in front of this property. Will there need to be any
offsite drainage modifications (see Sheet 7)?
14.
15.
16.
Comments / 5-20-96
Page 2
8. There needs to be discussion about increasing the proposed radius for driveways into
commercial sites.
9. The proposed low point inlet located between the two existing driveways into the Landmark
Nursery may conflict with what I discussed with you about eliminating one driveway into the
nursery and moving the other driveway to where it would be across the existing driveway into
the shopping center on the south side (see Sheet 8).
10. There are some proposed low point inlets which need to be moved so that they do no conflict
with locations of proposed driveways.
11. Provide the percent slope of all driveways on the plan and profile sheets.
12. Is the right-of-way on the south side of Sandy Lake Road shown on Sheet 9 correct? It would
seem like everything north of the drainage easement should be right-of-way.
13. In regard to the proposed super-elevations, please provide transition stations to and from the
super-elevated sections.
Is there anything to be gained by using a 3/8"/foot cross slop instead of l/4*/foot cross slope?
What happens to the two existing driveways at approximate Station 38 +007
On Sheet 11, the proposed concrete retaining wall on the northwest side of the culvert appears
as though an easement may be required.
17. In regards to the proposed free right turn lane to Riverchase Drive beginning at approximately
Station 48+00, please provide a curbed 100' transition.
18. It may be necessary to pull the western median nose back at the Sandy Lake Road/Riverchase
Drive intersection to provide enough room for left urns from Riverchase Drive onto Sandy Lake
Road. Please verify with turning radius templates.
19. There is a question in regard to how the existing right-of-way was established. Please provide
information on the existing right-of-way.
20. The proposed location of the driveway shown at approximately Station 56+00 needs to be
moved so that it is in line with the proposed street right-of-way for this property. Also, provide
a median opening with left turn lane at this point. A copy of the proposed plat will be
provided.
21. Will the existing Coppell entry sign located at approximately Station 57+50 be removed?
22. The location of storm drainage inlets at approximately Station 65 +00 needs to be moved to the
west to avoid any conflicts with existing and proposed driveways.
23. Show the proposed driveway and any other improvements associated with bridge design along
the James A. Harrington property on the south side of the road.
24. The City would like to discuss the possibility of providing a free right lane on MacArthur to
turn east on Sandy Lake Road. Also, there are a few traffic control channelization items that
need to be discussed (see Sheet 17).
:25. Show the 8' wide brick paver bands at all street and driveway locations. Also, show the fully
brick paver intersection at MacArthur and Sandy Lake Road as per the City of Coppell
Streetscape Plan and Standard Details.
26. The City has a concern regarding the drainage along the north side of Sandy Lake Road. Refer
to comments made in cross-section sheets.
27. The proposed grades of some of the proposed driveways exceed the City of Coppell's and
possibly Dallas County's maximum grade. Also, there is a concern regarding the site visibility
Comments / 5-20-96
Page 3
at some of the driveway locations due to grade difference of the proposed roadway and existing
properties along the roadway.
28. On the drainage area map on Sheet 27, the following comments need to be addressed:
a. The "C" valves for residential are high.
b. Flow arrows need to be shown for all drainage areas.
c. The drainage area shown at the southeast side of Sandy Lake Road needs to reflect what
was discussed at an earlier meeting.
d. The drainage areas shown at the northwest comer of the Kimbel Court/Sandy Lake Road
intersection is not clear. With the road to be raised higher than the existing parking lot,
an offsite drainage system may be needed.
29. Provide center line stationing for all storm drainage systems.
30. Show profile for all storm drainage system laterals. Also, all low point inlet laterals to be
minimum 21" pipe as per the City of Dallas Drainage Design Manual which has been adopted
by the City of Coppell in the Subdivision Ordinance.
31. Show the 100-year hydraulic grade line for all storm drainage systems.
32. The proposed locations of the headwall on the north side of the road for drainage system line
D needs to be moved so that if there is any offsite grading required the existing utility pole
would not be in the way.
33. It appears as though along the north side and possibly the south side of Sandy Lake Road there
will be drainage flow parallel to the roadway. If this is to happen, please provide details and
prof'fle of proposed ditches. Also, provide limits of grading into proposed headwalls.
34. Provide concrete rip-rap erosion protection at all headwalls.
35. Show the percent grade for all storm drainage laterals.
If you should have any questions concerning these comments, please contact me at 304-3681.
Sincerely
Assistant City Engineer
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