ST9301-CS 930428 q
DALLAS COUNTY
PUBLIC WORKS
April 28, 1993
Kenneth Griffin, P.E.
City Engineer
City of Coppell
P.O. Box 478
Coppell, Texas 75019
Re:
Sandy Lake Road, Project 91-830
(Mac Arthur Boulevard to Coppell City Limits)
Dear Mr. Griffin:'
I am writing in regard to your letter dated March 15, 1993 which
provides us with your review comments on the curb and right-of-way
alignment plan for the above section of Sandy Lake Road. There are
a number of comments which I feel needs further clarification
and/or discussion. I will discuss your review comments in the
order they appear in your letter.
Comment/Discussion
Item No. 1: The County has no problem with our consultant
including the brick pavers as required by your
streetscape plan providing the City of Coppell
fully understands that they will b e responsible for
the cost of funding the construction of this item
of work.
Item No. 2:
Landscaping can be provided as an item in our
construction contract however, we will expect the
City of Coppell to provide the design and plans for
this landscaping and to be responsible for the cost
of funding this item of work.
Once, we have a curb and right-of-way alignment
plans that the city of Coppell feels is.acceptable
the County will be more than happy to provide you
with the plans needed for your neighborhood meeting
and/or public hearing. We will be more than happy
to attend but will expect the City of Coppell to
conduct the meeting.
411 Elm Street
Dallas, Texas 75202
653-7151
April 28, 1993
Sandy Lake Road -- Project 91-830
Page 2
Item No. 3: Building the inside four rather than the outside
four is a stipulation which is causing us our
greatest concern. We hope that the City will
review this more objectively and reconsider its
~3~/ request. Some of the problems created are:
~ ~-~/ 9/1% Requires about a 3 inch lower gra~e (added
J/ _.~</ ' cost for add%tional roadway excavation).
.%~-'.~ 2) Future widening requires relocation of inlets
.~\ ~ (added cost). . . . _
~ ~ 3) Future widening will require re£oca~lon oz
street and traffic control signs (added cost).
4) Utilities poles might have to be relocated
another time (added cost).
5) Fire hydrants and water meters might have to
relocate another time (added cost).
6) Most importantly the property owners and
businesses must endure an additional
disruption to their driveways and the loss of
customers when the additional lane is added.
It is our feeling that the business properties
along Sandy Lake Road would rather forgo the
buffer adjacent to their property than have to
endure the disruption which would be created
with the construction of the outside lane.
Please provide additional information regarding the type of
commitment made in the 1990 Bond Program and whether the property
owners understood or were aware of the consequences of building the
inside rather than the oUtside lanes. If they were not made aware
of the negative aspects of this issue it is suggested that the City
of Coppell consider holding a neighborhood meeting or conduct a
poll of the property owners.
The issue of building the inside vs the outside lanes is a matter
of grave concern to us.
Item No. 4:
Item No. 5:
No comment.
Please provide detailed design and layout
information for our consultants on providing a full
pavestone intersection. The cost of funding this
construction will be the responsibility of the City
of Coppell.
April 28, 1993
Sandy Lake Road -- Project 91-830
Page 3
Item No. 6:
Item No.
7:
We will expect the City to provide our consultants
with the necessary information for showing the
location and type of conduit needed for irrigation
and street lighting when the preliminary plans are
submitted for review. These are also items which
require funding by the City.
Ae
The median openings which have been shown are
felt to provide the best access opportunities
to serve the abutting properties. An opening
has not been planned at Kimbel Court because
it falls too close to the intersection of Mac
Arthur Boulevard to safely accommodate one
when Sandy Lake Road is fully developed as a
six lane divided roadway.
Kimbel Court is only 600 feet long and east
bound traffic can easily access this street by
traveling north on Mac Arthur Boulevard to
Village Parkway (about 600 feet north of Sandy
Lake Road) and east on Village Parkway to
Kimbel Court. If access for emergency
vehicles to Kimbel Court is the main concern -
it is suggested an area across the median be
paved with pavestone and a laydown curb.
Be
With regard to the two openings to serve the
shopping center on the south --- this center
has some 1000 feet of frontage on Sandy Lake
Road and it is felt two openings are
warranted. The opening at station 25+00
provides the added opportunity to serve
property owner on both sides of the roadway.
The matter of landscape areas in the median
require by City rules and regulations is one
which the City of Coppell needs to address.
Your review of these plans should have
established where and what median openings the
fcity wanted to include on this project. If
~ the need for median landscaping is more
<important than ingress and egress for the
/abutting prope.rty owners please feel free to
L close any openings you wish to close.
April 28, 1993
Sandy Lake Road -- Project 91-830
Page 4
Item No. 8:
Please be advised that we will attempt to provide
driveways at all locations currently served by a
driveway. The width of drive which we will provide
will attempt to match the width of the existing
drive whenever possible.
Item No. 9: No comment.
Item No. 10:
It was our understanding that the normal driveway
radius would be 10 feet for this project. If there
are driveway radius which you feel should be larger
we asked that you simply note it on the plans.
You should however be aware that the existing
drainage structures at the drives into the shopping
center will not permit the larger radius without
the reconstruction of the structures wingwalls.
~The cost to modify these structures to obtain 20
foot drive returns is a cost the City of Coppell
Item No. 11:
will be expected to provide. Please advise us as
to whether or not 20 foot radius are still desired
at these locations.
A 60 foot minimum median opening will be provided
at all locations as requested.
Item No. 12: No comment.
Item No. 13: A.
The 600 foot centerline radius for curve #1
was planned with a 1/2 inch per foot
superelevation in both lanes and a design
speed of 40 MPH. To increase the radius to
850 feet will require about 1/4 inch/foot
superelevation to get a 45 MPH design.
Be
The amount of additional right-of-way require
along the south side will be greatly increase
even with the 850 foot minimum desired radius.
The existing drainage channel on the south
side will require relocating further south.
An existing 4 barrel 8x10 foot box culvert
will require reconstruction and one apparent
access structure crossing the channel will
need to be removed or reconstructed.
April 28, 1993
Sandy Lake Road -- Project 91-830
Page 5
It does not appear that the City of Coppell development planning
along Sandy Lake Road envisions a 850 - 1000 foot radius or design
speed of 45 - 50 MPH and it is requested that you seriously
reconsidered this request.
Item No. 14:
The 12 foot minimum drive width is meant to occur
at the property line or 10 foot back of the curb is
it not?
Item No. 15:
A left turn lane will be provided. We did not
originally provide one because this opening was
intended to act as a distance break of about 1000
foot between openings. If distance breaks are not
desired this opening can be closed since it only
serves a residential property. The turn lane was
not provided at this location because the median
width is adequate to shelter one or two vehicles
making a left turn, and a turn lane was not felt to
be necessary.
Item No. 16: No comment.
Item No. 17:
An intersection or driveway which has a median in
it permits the width of the opening to be reduced.
Vehicle turning templates clearly show that a
reduced width is possible, this provides a minor
cost savings.
If Riverchase will someday extend to the north or
if you just want the wider opening we will be happy
to accommodate your wishes.
Item No. 18:
We are not familiar with the type of vehicle usage
for the drive at 49+40 left, but it appears to only
provide access along the Dallas Power and Light
Company power line. A 40 foot width at the
proposed property line with 20 foot drive radius
will accommodate a WB-50 vehicle. If the City
desires a free right turn for this or any other
location or wants to maintain a 175 foot drive
opening at the curbline for the drive please let us
know.
Item No. 19: No comment.
Item No. 20: See our comment under 15.
April 28, 1993
Sandy Lake Road -- Project 91-830
Page 6
Item No. 21:
With regard to the drive at sta 69+00 (left) it has
not yet been determined as to how access will be
provided. This will need to be determined after
the location of the west end of the bridge has been
established.
Item No. 22: No comment.
We will be happy to meet with you and or members of your staff to
review our comments and in p.articular those which we feel c~eed\
further clarification and/or discussion, particularly Comment
10 and 13. We also feel a meeting may be necessary to .discuss the
matter of the 2 foot freeboard vs i foot freeboard required by your/
Floodplain Management Ordinance and whether or not an appeal~
process is provided for the freeboard question. We have estimated
a 2 foot freeboard will add approximately $100,000.00 to the cost/
of this project.
Sincerely, /
~f. Phillip Weston, P.E., Sverdrup Corporation