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MEMORANDUM
TO: Mayor and City Council
VIA: Kenneth M. Griffin, P.E., Director of Engineering/Public Works
FROM: Keith R. Marvin, P.E., Project Engineer
DATE: July 12, 2011
RE: Consider approval of Contract Amendment #6 in the amount of
$70,000.00 to the Teague Nall & Perkins design contract for
improvements on West Sandy Lake Road, from Denton Tap Road to
SH 121; and authorizing the City Manager to sign any necessary
documents.
On December 12, 2000, City Council approved a contract with Teauge, Nall, & Perkins,
Inc. for the design of West Sandy Lake Road from Denton Tap to SH 121. The initial
design contract was in the amount of $1,005,600.00. There have been 5 previous
amendments covering such things as adding the traffic signal design at Whispering Hills,
adding additional survey, adding additional utility design and adjustments for the
extending the contract schedule. The total cost of all five previous amendments is
$339,520 for a total current contract amount of $1,345,120.00. The largest change came
about when the city approved an agreement with the State of Texas concerning partial
funding of the portion of the project between North Coppell Road and South Coppell
Road. On January 22, 2008, City Council approved an amendment in the amount of
$147,600 for additional services related to design changes and general compliance with
state and federal criteria for the project related to the partial funding agreement.
On June 14, 2011, City Council approved an amendment to the Advanced Funding
Agreement with the State of Texas that in effect terminated the original agreement. We
are now free to proceed with the design of this portion of Sandy Lake Road to city design
standards.
This current amendment is necessary to bring the construction plans to completion using
City of Coppell design criteria. A few examples of the plan changes that will take place
are the elimination of a 2" asphalt layer between the subgrade and the concrete paving,
the narrowing of the hike and bike trail from the state required 10' width to the city
standard 8' width and substitution of the city standard decorative bridge rail in lieu of the
state standard. Some of these changes will result in cost savings during the construction
phase of the project.
Staff recommends approval of this contract amendment #6 with Teauge, Nall, & Perkins,
Inc. in the amount of $70,000.00 as provided for in CIP funds. Staff will be available to
answer any questions at the Council meeting.
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X% P TE4+GUE NALL AND PERKINS
Civil Engineering Surveying Landscape Architecture Planning
CITY OF COPPELL
Consulting Engineer's Contract
Modification to the Scope of Services
1. Scope of Work
TNP shall provide professional civil engineering services, as outlined below, for completing
the preparation of design plans for the Vilest Sandy Lake Road reconstruction project. This
modification is for additional services associated with the existing contract. For the portion of
roadway between North Coppell Road and South Coppell Road (also referred to as Phase
2A), the construction plans will no longer need to accommodate TxDOT design standards,
and shall be revised to meet the City of Coppell design standards. Previous and ongoing
work being done under this existing contract will be utilized to the fullest extent possible,
including agreed upon preliminary horizontal and vertical designs, meeting decisions, and
construction specifications. The following are anticipated changes to the scope of work:
• Extension of time frame for completion of design and construction administration in 2012.
• Additional meetings and correspondence with City representatives.
• Plan modifications to reflect City standards, such as: sheet setup, plan set layout„ typical
sections, standard details, bridge railing design /details, construction quantities,
• Update construction plans to reflect recent tree removals in project corridor, and adjust
design in specified locations regarding retaining walls to save trees.
• Revise intersection layout of South Coppell Road.
• Include adjustments to existing water lines.
ll. Project Schedule
The work will generally proceed in conjunction with the remaining schedule for the West
Sandy Lake Road project, as determined jointly by the City and TNP. It is anticipated that this
phase will bid for construction in early 2012.
Ill. Compensation
The Engineer shall be paid an additional lump sum fee for the above described Additional
Scope of Services in an amount of Seventy Thousand, and no/100 Dollars ($70,000). This
amount includes the foliowing increases:
Additional Engineering Design $ 0,000
TOTAL $ 70,000
12160 North Abrams Road, Suite 508 Dallas. Texas 75243 214.461.9667 phone 214.461.9864 fax
www. mp-onfine. caul
AGREED: AGREED /ACCEPTED:
THE CITY OF COPPELL TEAGUE NALL AND PERKINS, INC.
By: By:
Date: ,12, , Date: (n l7
Attest: _ Attest: ,
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