Item 4B AudioSOUTHLAKE
, r iteM 4B
City Council Members — Item 4B is for Change Order No. 8 for the Neighborhood
Sanitary Sewer Project
Requested Action
Approve Change Order No. 8 with
North Texas Contracting, Inc. in the
amount of $479,539.00 for
additional utility and drainage
improvements associated with the
Neighborhood Sewer Program
The requested action is to approve change order no. 8 with North Texas
Contracting, Inc. in the amount of $479,539.00 for additional utiility and drainage
improvements associated with the neighborhood sewer program.
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Background Information
• 2001
— Completed preliminary design engineering for the neighborhood
sewer project
April 2008
— Contract awarded for preparation of final plans and specifications
— Pavement reconstruction of the neighborhood streets and East
Dove Road from Lonesome Dove Rd to Kimball Ave added
— 12" Water line along Dove Road — meets City's water master plan
requirements
— Sewer improvements along Pearson Road from Johnson Road to
Gray Lane
— Water, sewer, storm, and paving improvements for Primrose Lane
• November 3, 2009
— Construction contract awarded to North Texas Contracting, Inc.
The preliminary engineering design for the neighborhood sewer was completed in
2001 and included constructing sanitary sewer lines to serve the Heatherwood,
Royal Oaks, and Twin Creeks neighborhood.
The contract for the final design was awarded in 2008. The final design includes
sanitary sewer within the three neighborhoods and along Dove Road. In addition,
pavement reconstruction along Dove Road from Lonesome Dove to Kimball Ave
and the 4 neighborhood streets were added to the design contract. Approximately
5,000 linear feet of 12 inch water line on Dove Road was also included in the design
contract meet the City's water master plan requirements. Various drainage
improvements were also included along Dove Road and within the neighborhood
streets.
Improvements including water, sewer, storm, and paving were included along
Primrose Lane in addition to sewer improvements along Pearson Road from Grey
Lane to Johnson Road.
The construction contract was awarded to North Texas Contracting, Inc. on
November 2, 2009 and work began in January of 2010.
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Proposed Change Order No. 8
• 3,600 linear feet of 8" waterline along N. Kimball Ave from E. Dove
Road to the City limit line
— Meets requirement of interlocal agreement with City of Grapevine
dated July 9, 2009
Drainage Improvements (E. Dove Road / Hunter's Creek)
• Improving Safety Conditions
— Drainage structure enclosed to provide a 3:1 slope and clear
zone to remove potential hazard (steep ditch) for motorists
along E. Dove Road
— Transportation safety standards for design speed along E. Dove
Road require minimum 10 foot clear zone to remove guard rail
— Guard rail will be removed
• Improving aesthetics
— A total of 6 guard rails eliminated along E. Dove Road
• Quantity adjustments for original contract to date
The proposed change order no 8 includes approximately 3,600 linear feet of 8"
water line along the west side of N. Kimball Ave from Dove Road to the city limit line
to replace an existing 2" waterline that is substandard. Per an interlocal agreement
signed on July 9, 2009 with the City of Grapevine, Grapevine has been providing
water service to newly developed properties in this area until such time as
Southlake could construct the Kimball 8inch waterline.
Also included in this change order are drainage improvements at the corner of Dove
Road and Hunter's Creek. During the construction of the neighborhood sewer
project, 5 guard rails were removed and culvert modifications made. These changes
were made in order to meet the transportation standard which requires a 10 foot
clear zone for a 35mph roadway should motorists accidently veer off road.
An open drainage structure behind a 6t" guardrail was determined to pose a hazard
for motorists. Staff recommends that the structure be modified and enclosed in
order to backfill and grade to provide a 3:1 slope and the required clear zone for
motorists. In addition, removing the remaining guard rail will improve the aesthetics
of Dove Road.
This change order also includes additional 18" ribbon curb and 10" sanitary sewer
not included in the original bid quantities. Furthermore, during construction of the
12" waterline, a 4" gas line was discovered to be in the proposed location of the
water line. As a result, it was necessary to relocate the waterline under the
pavement resulting in additional costs.
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Proposed Change Order No. 8
Kimball 8" Water Line
Drainage Improvements
Quantity Adjustments
Total Change Order No. 8
$ 367,070.00
$ 40,811.00
$ 71,658.00
$ 479, 539.00
The total amount of change order no 8 is $479,539.00. This consists of
$367,070.00 for the 8" water line along Kimball Ave, $40,811.00 for the drainage
improvements, and $71,658.00 for quantity adjustments to the original contract bid
items to date.
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Financial Consideration
Original Contract
Change Orders No. 1 -7
Change Order No. 8
Total Contract Amount
$3,748,737.54
$ 878,824.43
$ 479, 539.00
$5,107,100.97
The total amount of the contract with proposed change order no 8 would increase to
$5,107,100.97.
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The construction of the proposed changes relates to the City's stategy map in the
focus areas of Infrastructure and Performance Management and Service Delivery.
The core objectives met are providing high quality customer service and investing to
provide and maintain high quality public assets.
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The City of Southlake provides municipal services that support
the highest quality of
life for our residents and businesses. We do this by delivering outstanding
unrivaled quality in everything that we do.
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The construction of the proposed changes relates to the City's stategy map in the
focus areas of Infrastructure and Performance Management and Service Delivery.
The core objectives met are providing high quality customer service and investing to
provide and maintain high quality public assets.
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SOUTHLAKE
Please contact Bob Price at 817- 748 -8097 with any questions regarding this agenda
item.