ST9902-CS070627
(3/9/2010) Keith Marvin - West Sandy Lake Road Information Page 1
From:
"Matt Atkins" <matkins@tnp-online.com>
To:
"Keith Marvin" <kmarvin@ci.coppell.tx.us>
CC:
"Mark Holliday" <mholliday@tnp-online.com>
Date:
6/27/2007 1:28 PM
Subject:
West Sandy Lake Road Information
Attachments:
Coppell-TxDOT.dot; Memo-Ken 11-29-06.doc; summary_report.doc
Good Morning Keith,
Attached is the information we discussed last week regarding Sandy Lake
Road. I have been out of the office for a couple of days and am just
now able to get this to you. If you have any questions or comments,
please feel free to give me a call or send me an email. Thanks and have
a good day.
Matt Atkins, P.E.
Project Manager
12160 North Abrams Road, Suite 508
Dallas, Texas 75243
214.461.9867 office
214.461.9864 fax
matkins@tnp-online.com <mailto:matkins@tnp-online.com>
www.tnp-online.com <http://www.tnp-online.com/>
Memorandum
Mr. Ken Griffin, P.E.
To:
Matt Atkins, P.E.
From:
Mark Holliday, P.E.
cc:
November 29, 2006
Date:
Re:West Sandy Lake Road – Federal Funding
As mentioned in our memo dated October 18, 2006, we have attached a preliminary Design
Summary Report (DSR) that TxDOT will require for the above referenced project. Based upon our
research and TNP’s recent history on a similar project, we think that a meeting should be held with
TxDOT representatives to discuss the DSR and determine what design elements will need to be
changed and what elements will need Exceptions and Waivers from TxDOT’s standards. Once you
have reviewed the DSR, we would like to meet with you to determine what items the City would like
to stand firm on and which items could have some flexibility. After our meeting we would like to send
the DSR to TxDOT and request a meeting to review and decide what design elements will need to be
changed. Once we have determined this information, we will be able to accurately assess our
amendment to our existing design contract. Below is a partial list of items that do not conform to
TxDOT Standards or items that will require more information.
Schematic Design – TxDOT will most likely require a revised schematic design. We will need to
identify exactly what elements they will require in the schematic in order to convert our
current design into an acceptable schematic.
TxDOT does not generally allow any utilities under the pavement sections. The existing 24”
waterline will be under a majority of the pavement section as will proposed storm drain
facilities.
TxDOT will most likely require a SUE to be performed.
TxDOT will require the traffic counts to be projected for various years, if they do not have the
projections already.
The parkway width (Border) of 12-feet is less than TxDOT’s standard of 15-feet.
Curb offsets are not currently proposed. We might be able to call the travel lanes 11-feet
wide with 1-foot offsets. This will meet their absolute minimum standards. The desirable widths
are 12-feet lanes and 2-feet of curb offset.
The median width of 16-feet is less than TxDOT’s standard of 20-feet.
The median deceleration and storage lengths are significantly less than TxDOT’s minimum.
The minimum values for these design elements are 75-feet and 100-feet, respectively.
The special bridge railing is not a TxDOT standard rail.
12160 North Abrams Road, Suite 508 Dallas, Texas 75243 214.461.9867 phone 214.461.9864 fax
|||
www.tnp-online.com
The City drainage design standards exceed TxDOT’s standards. The City will most likely be
asked to pay for the difference.
TxDOT will most likely not like the pavement design that has been completed. They require
special calculations and testing that was not provided in the geotechnical report.
TxDOT requires continuously reinforced concrete pavement and a 4-inch HMAC
underlayment along with stabilized subgrade. The City standard for this roadway is 8” of
reinforced concrete pavement and 8” of cement stabilized subgrade.
A scour analysis for Cottonwood Creek Bridge was not performed with the original
geotechnical investigation, and TxDOT will most likely require that one be completed.
TxDOT will require some type of accelerated contract procedure listed on DSR - 15.
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Memorandum
To:
Ken Griffin, P.E.
From:
Mark Holliday, P.E.
Matt Atkins, P.E.
Date:
10-18-06
Re:
West Sandy Lake Road, Phase Two
Below is a preliminary summary of the tasks and issues that have been determined thus far as
necessary for continued design of the second phase of West Sandy Lake Road.
1. Prepare a Design Summary Report (DSR) that identifies all current City design criteria used
for the project to date. This is a TxDOT standard 20-25 page questionnaire report. In
preparing the DSR, we will need to note where the City criteria does not meet TxDOT
criteria. Where it does, we must reference the appropriate section in the TxDOT Roadway
Design Manual. Where it does not, we must note that it is City criteria and then decide ahead
of time if it is something worth fighting TxDOT on, or just modify the design.
2. Set up meeting w/ TxDOT and City representatives to review DSR and discuss any criteria
concerns and changes. Use the current design layout as the “schematic” to discuss.
3. Potential current design criteria and/or issues that TxDOT may contend include the following:
a. Pavement design standards: TxDOT requires a continuously reinforced concrete
pavement (CRCP) section on an HMAC base.
b. TxDOT standard is to not allow utilities within the pavement areas. They especially
do not like utility lines that are under pressure underneath their pavement. However,
since it is an off-system roadway, we should push to put the City utilities wherever the
City wants them, and are currently designed.
c. TxDOT standard roadway section may require different lane, median, and parkway
widths.
d. Limits of Environmental Assessment may be extended beyond Phase 2a
improvements, depending on what TxDOT determines to be the logical termini.
4. In addition to potential design changes associated with the above, other standard procedural
or plan preparation items will need to be incorporated:
a. Prepare a new/updated schematic design based on agreed upon criteria changes.
Address review comments.
b. Need to confirm intent for who will be handling the Environmental Assessment.
Prepare EA or coordinate with TxDOT sub. EA could be a 1-year process.
c. Complete the standard bridge layout checklist and prepare a scour analysis.
d. Prepare a signal warrant study.
e. Prepare a pavement design report.
f. Prepare additional standard sheets for traffic control, bridge, signage/striping.
g. Provide comprehensive working day analysis for project.
h. Have a public meeting w/ TxDOT representatives present.
12160 North Abrams Road, Suite 508 Dallas, Texas 75243 214.461.9867 phone 214.461.9864 fax
|||
www.tnp-online.com
5. Recommend not using TxDOT funds to purchase right-of-way in order to expedite process.
City can negotiate at own risk while EA is ongoing. TxDOT waits until EA is cleared.
Once we have completed the preparation of the DSR, and evaluated the project to determine
what does not meet TxDOT criteria, we need to meet with you and determine what the City
wants to fight for. This should occur before our meeting with TxDOT so TNP and the City will be
on the same page. We should also give TxDOT a copy of the DSR ahead of the meeting in
order to make it more productive.
Please let us know when you can be available to meet with us regarding these matters. Thank you
for the opportunity to be of service.
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