Item 4C audioCity Council Members:
Item 4C on the consent agent is for the approval of amendment number 7 to the
existing professional services agreement for the design services on the
neighborhood improvement project in Heatherwood Estates, Royal Oaks
Addition, and Twin Creeks Addition with Cheatham and Associates in the
amount of $14,757.50.
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The construction of the sanitary sewer improvements
within these neighborhoods links to the City’s
strategy map relative to the focus areas of
Infrastructure and Performance Management and
Service Delivery. The specific corporate objectives
that are met include Providing high quality customer
service and investing to provide and maintain high
quality public assets.
This is a map indicating the location of the proposed sewer to be constructed
within the Heatherwood Estates, Royal Oaks, and Twin Creek neighborhoods.
Also indicated on the map is a portion of sanitary sewer to be constructed along
East Dove Road in order to serve those properties as well.
Cheatham and Associates was retained by the City of Southlake in 2001 to
begin preliminary design for the sanitary sewer within the Heatherwood Estates,
Royal Oaks, and Twin Creeks neighborhood. City Council approved a
professional services agreement on April 1, 2008 with Cheatham and Associates
to prepare final plans and specifications for the design of the sanitary sewer. In
addition, the contract included the pavement reconstruction design of the
neighborhood streets and East Dove Road from Lonesome Dove to Kimball Ave.
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In September 2008, amendment number 1 was approved by the City Manager
and included the design of a sanitary sewer lift station on Creekside Drive to
achieve construction of a shallower sewer line.
In April 2009, the City Manager approved amendment number 2 which included
preparation of final plans and specifications for landscaping and irrigation
associated with the proposed lift station.
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Amendment number 3 was approved by the City Manager in August 2009 and
included design of a 12 inch water line from Lonesome Dove to Kimball Ave.
This portion of the project would connect to the 12 inch water line that was
constructed as part of the Dove Drainage project from Carroll Ave to Lonesome
Dove.
Amendment number 4, also approved in August 2009 by the City Manager
consisted of the evaluation of the existing culverts and guardrails along East
Dove Road. Various drainage improvements along East Dove Road were also
included in this amendment.
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In September 2009, the City Manager approved amendment number 5. This
amendment included the modification of the pavement design for East Dove
Road from Lonesome Dove Road to Kimball Ave. The original design allowed
for Dove Road to be widened slightly by 2 feet to match the section from Carroll
to Lonesome Dove recently constructed. During review of the design it was
determined that due to limited ROW, the additional 2 feet resulted in the barrow
ditches exceeding the allowable side slopes. The design was modified to keep
the existing width of road with some minor ditch grading along East Dove Road.
Amendment 6 was approved in March 2010 by the City Manager. After meeting
with several residents along Creekside Drive concerning the construction of the
proposed lift station, the design engineer evaluated several options to screen the
electronic equipment associated with the lift station.
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Proposed amendment number 7 is for the amount of $14,757.50. The current
location of the sanitary sewer is located approximately 5 feet west of the
pavement with the ROW maintained by the residents. Heavy landscaping,
several new driveways, and retaining walls exist along the current proposed
alignment of the sanitary sewer. This amendment proposes to move the sewer
into the road where possible, however directional drilling will still be used as the
method of installation of the sewer line. In several past directional bore projects,
“bellies” or sags in the line have been identified. These bellies are required to
be repaired to ensure that the sewer functions as designed. Should a repair be
required, a large hole potentially would be dug on the residents property
depending on the depth of the sewer at the location of the repair. Moving the
sewer out into road will minimize the impact to the residents property. The total
cumulative of the seven amendments exceeds the City Manager’s approval and
therefore needs City Council approval.
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Staff recommends that Council approve amendment number 7 to the existing
professional services agreement for the design services on the neighborhood
improvement project in Heatherwood Estates, Royal Oaks Addition, and Twin
Creeks Addition with Cheatham and Associates in the amount of $14,757.50.
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Please contact Bob Price with any questions regarding this item at 817-748-
8097.
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