ST9301-CS 940726DALLAS COUNTY
PUBLIC WORKS
July 26, 1994
Mr. Ken Griffin, P.E.
City Engineer\City of Coppell
255 Parkway Boulevard
P.O. Box 478
Coppell, Texas 75019
Re:
Sandy Lake Road, Project No. 91-830
(Mac Arthur Boulevard to Coppell City Limit)
Widening Cost for Bicycle Lane
Dear Mr. Griffin:
I am writing to you in response to item No. 2 in you letter of June 20, 1994, regarding the adding of
bike lanes to this project and the estimated cost of this additional construction.
We have just received a response from our consultants, Sverdrup Corporation regarding the cost to
widen both sides an additional three feet to accommodate bicycles. The cost to widen the embankment,
lengthen culverts, and provided an additional three feet of lime stabilized subgrade and three feet of
concrete pavement has been estimated by them to be approximately $121,078.00.
In addition there is an estimated additional engineering design cost of $24,470.00 to revise the plans
to provide for the bicycle lanes on this project. A copy of our consultants estimate cost increase to add
bicycle lanes to this project is provided for your information and files.
The City of Coppell will be held fully responsible for this $148,548.00 in additional costs should the
City elect to request the adding of bicycle lanes to this project.
Since, our consultants are on hold we would appreciate your early response as to whether or not we are
to add bicycle lanes to this project. If you have any questions about their cost estimate, please feel free
to contact me at (214) 653-7151.
Sincerely,
Pr°~~BEJ:slc
~c~ent:
xc: Phil Weston P.E., Sverdrup Corporation
411 Elm Street
Dallas, Texas 75202
653-7151
1[ !' ~! T' r
July 19, 1994
Mr. Bill Jessup, P.E.
Dallas County
Department of Public Works
411 Elm Street
Dallas, Texas 75202
Sverdrup Civil, Inc. 214 520-2116
434' Oak Law~
Suite 300
Da'tas Texas 75219
JUL 1994
COUffi'Y DIRECTOR OF PUBliC _WORKS
Subject:
Sandy Lake Road - MacArthur Blvd to Coppell City Limit
Project No. 91-830
Widening for Bicycl~ Lane
Dear Bill,
By telephone and by your letter of June 24 to the City of Coppell, you asked that we
develop an estimate of the cost to provide a wider pavement section on Sandy Lake
Road to allow for a three-foot bike lane. You also requested an estimate of the costs
to revise our plans to accommodate this change. We have reviewed the work involved
and have determined the following.
The changes to the construction costs would be the cost of an additional three feet of
concrete pavement and lime-treated subgrade, plus additional embankment and culvert
extensions. Our preliminary plans and estimate, submitted March 10, included the width
of embankment required for the future three-lane section but would require an
additional six foot of width. The culvert extensions shown in the preliminary plans also
allow for the future six-lane section and therefore would require a additional six feet of
length. Our estimate of the additional construction costs is summarized below.
Item Description Unit Ouanti~ Pric~ Total
132 Embankment CY 3826 5.00 $19,130.
260 L/me Slurry TON 44 80.00 3,520.
260 Lime Treat Subgrade SY 3232 1.50 4,848.
360 Conc Pay Reid. (8") SY 3232 23.00 74,336.
430 C]A Conc Culvert CY
20 350.00 7,000.
440 Reinforcing Steel LB
2473 0.50 1,237.
+ 10% Contingency
Estimated Additional Construction Cost =
$121,078.
Mr. Bill Jessup
July 19, 1994
Page 2
The plan changes involved are more complex. The typical sections would be revised to
show the wider section. The plan/profile sheets would require changes in plan to show
the wider pavement, as well as revisions to the top of curb profiles on both sides. Most
drainage areas would be recalculated for the tabulation on the Drainage Area Map.
Finally, all the cross-sections would be revised to show the wider section .and revised top
of curb elevation. We estimate that this would require 295 additional hours to complete.
The costs for thi.~ work are summarized as follows.
Total Salaries
Overheard @ 162.74%
Fixed Fee @ 15%
ODC: Computer Time
= $7,056.
= 11,483.
= 2,781.
= 3.15Q,
Estimated Additional Design Cost = $24,470.
Sverdrup is committed to completing the design plans to the satisfaction of both the
County and the City of Coppell. Please review the above information, and let us know
how you wish to proceed.
Of course, if you have any questions, we would be happy to discuss them.
Sincerely,
SVERDRUP CIVIL, INC.
Philllp O. Weston, P.E.
Project Manager
PGVi//mm