Item 4CCITY OF
SOUTHL_AKE
MEMORANDUM
(May 4, 2010)
To: Shana Yelverton, City Manager
From: Robert H. Price, P.E., Director of Public Works
Subject: Approve Amendment No. 7 to the existing Professional
Services Agreement for design services on the Neighborhood
Improvement Project in Heatherwood Estates, Royal Oaks
Addition, and Twin Creeks Addition with Cheatham and
Associates, Inc. in the amount of $14,757.50.
Action
Requested: Approve Amendment No. 7 to the existing Professional Services
Agreement for design services on the Neighborhood Improvement
Project in Heatherwood Estates, Royal Oaks Addition, and Twin
Creeks Addition with Cheatham and Associates, Inc. in the amount
of $14,757.50.
Background
Information: In 2001, Cheatham and Associates completed preliminary
engineering for the design of the sanitary sewer for Heatherwood
Estates, Royal Oaks Addition, and Twin Creeks Addition.
The original 2001 design included a deep sewer construction for
portions of the project. The depths would exceed 25 to 30 feet in
some areas of the neighborhood with the deepest portion located
on Heather Lane. The construction method to be used is
directional drilling to minimize the disruption to the residents in the
area.
City Council awarded a contract with Cheatham and Associates on
April 1, 2008, to prepare the construction plans and contract
documents associated with the neighborhood sewer. In addition,
the street reconstruction of Heatherbrook Court, Heather Lane,
Royal Oaks Court, Creekside Drive, and East Dove Road (between
Lonesome Dove and Kimball Ave) were included in this contract.
In September 2008, Amendment No. 1 was approved by the City
Manager in the amount of $5,240.00 for the design of a sanitary
sewer lift station on Creekside Drive to allow shallower excavation
to construct the gravity sewer line. The construction of the lift
station would allow the sewer to be raised 10 to 15 feet in these
deep areas. The lift station is needed due to the elevation changes
between Creekside Drive and Heather Lane.
In April 2009, Amendment No. 2 was approved by the City Manager
in the amount of $2,025.00 for the preparation of final plans and
specifications for landscaping and irrigation associated with the
proposed lift station.
In August 2009, Amendment No. 3 was approved by the City
Manager in the amount of $11,620.00 for the design of the
extension of the 12 -inch water line from Lonesome Dove to Kimball
Ave to meet the City's Water Master Plan.
In August 2009, Amendment No. 4 was approved by the City
Manager in the amount of $7,280.00 to evaluate the existing
culverts and guardrails along East Dove Road. The amendment
also included the design of drainage improvements along East
Dove Road. The engineer provided final plans and specifications.
In September 2009, Amendment No. 5 was approved by the City
Manager in the amount of $7,920.00 for modification of the
pavement design for East Dove Road (from Lonesome Dove Road
to Kimball Ave.). After reviewing the plans, it was determined that
widening the road 2 foot would result in the existing borrow ditches
exceeding the allowable side slope due to limited right -of -way
available. The engineer would modify the design to allow for this
section of roadway to remain the current width.
In March 2010, Amendment No. 6 was approved by the City
Manager in the amount of $10,380.00 to evaluate several options
for screening the electronic equipment associated with the
proposed lift station after several residents met with the City to
share their concerns. The engineer would provide drawings and
cost estimates for each option evaluated.
The current amendment is for the design of the sewer line along the
neighborhood streets to be moved into the road and is in the
amount of $14,757.50. Currently the proposed location of the
sewer line along these streets is approximately 5 feet back of curb
on the west side of each street. Although the sewer will be
directionally bored, there is potential for sags or "bellies" to be
created during installation of the sewer line.
The City requires the contractor to repair the "bellies" before the
line is accepted. These are well established neighborhoods with
many large trees located on each lot. In addition several of these
properties have retaining walls and heavily landscaped areas
located in the proposed alignment of the sewer line. Should a
"belly" exist and require repair, the disruption to the residents
existing property will be minimized by placing the sewer line under
the pavement.
Financial
Considerations: The current amendment to the contract puts the total amendment
amount of $59,222.50 above the City Manager's signature
authority. Funds for the engineering design of the neighborhood
sewer are included in the FY2008 Utility Fund CIP budget for this
project.
Staff recommends funding the project from the following existing
CIP account:
502699- 598801 -00025 $14,757.50
Strategic Link: The construction of the sewer line and street improvements within
the 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 by
the construction of this sewer and street infrastructure include:
Providing High Quality Customer Service and Investing to provide
and maintain high quality public assets.
Citizen Input/
Board Review: N/A
Legal Review: N/A
Alternatives: The City Council may approve the Amendment to the existing
Professional Services Agreement or deny it.
Supporting
Documents: Location Map
Cheatham and Associates Proposed Amendment No. 7
Staff
Recommendation: Approve Amendment No. 7 to the existing Professional Services
Agreement for design services on the Neighborhood Improvement
Project in Heatherwood Estates, Royal Oaks Addition, and Twin
Creeks Addition with Cheatham and Associates, Inc. in the amount
of $14,757.50.
Staff Contact: Robert H. Price, P.E., Public Works Director
Gordon J. Mayer, Jr., P.E., City Engineer
Michelle McCullough, P.E., Civil Engineer
IWO
,. u
j
we
ENGINEER'S CONTRACT
SUPPLEMENT AGREEMENT NO.7
CITY OF SOUTHLAKE
THE STATE OF TEXAS
TARRANT COUNTY
KNOW ALL MEN BY THESE PRESENTS:
THIS SUPPLEMENT AGREEMENT made and entered into this , by and
between the City of Southlake, hereinafter referred to as "City" and Cheatham and Associates,
hereinafter referred to as the "Engineer ".
WITNESSETH THAT:
WHEREAS, the City and the Engineer entered into a contract on April 1, 2008, to acquire
professional engineering services for the streets and utilities in Heatherwood Estates, Royal Oaks
Addition, and Twin Creeks Addition, and a portion of Dove Road.
NOW THEREFORE, it is hereby agreed between the parties hereto that the contract of April 1,
20.08, be modified as follows:
SCOPE OF CHANGE
Provide professional engineering services regarding the revision to the construction plans.
Approximately 7485. feet of 8" and 10" sanitary of gravity sewer line will be relocated into the
street. In addition, approximately 1700 linear feet of 4" force main and 2570 linear feet of
gravity sewer will be redesigned to alleviate the need for grinder pumps at three residences.
Plan Revisions:
There are .12 plan/profile sheets of the construction plans which will need to be revised.
The sewer line will be relocated to place it beneath the street. This will require a total
revision to the plan/profile sheets since the lengths of the lines will change and therefore
the grade of the line will be revised.
In addition, there are G sheets which will be revised by redesigning the sewer line to
alleviate the need for individual grinder pumps at three residences.
The cost to revise the construction plans as stated above is $14,757.50 as shown on
Attachment "I".
ORIGINAL CONTRACT
All requirements of the aforesaid contract of April 1, 2005, and this Supplement Agreement No.
7, shall remain in full force and effect.
IN WITNESS WHEREOF, the parties hereto have caused these present to be executed by their
respective officers duly authorized as of the day and year first above written.
CV AUJIN 1 11 1
CITY OF SOUTHLAKE, TEXAS
M
Bob Price, P.E.
Director of Public Works
By:
Shana Yelverton
City Manager
ENGINEER:
F:1 W ORDISOUTHLAKE -DD l ISUPPAGRMT7REV.DOC
X
f0
7
N
W
Z
O
Y
m
LL!
0
2
C
CO
LO
r
w
Y
O
Q
E'IN
9
o;
'
3
to
to
°
c
LD ti
O O
i
I`�
I II €�
�
y N
V U
T
1
W W L-
V
N N ra
Q
Na
a
........
....
m W
a
Z
uj Z
w
--
_-
_ -
-
- --
T
-
<LU
Ln
:
W W
I
° o,
Z
I
Co
C,
Z
a.
3 3
E
I
W
a
h^ lu
O
V-
ui�
i
0
Q
ox
W U J
a.
LLI
QLU
I
W o 000 00
:0 U
1
01 64 6f3 6F5 fH H3 44
Q
f
a
N
Q Z W
co
�
�-
w ¢ w
i
-...; ._
Cl)
1O
a �€
Ii
0O
4
Lu
LLI
N
€
�
1
�
�
E
W
W:
I
E
Z
t]
Z
1
C
Z
€UI
:
On
LL,
w
[t v
I
w
Z
w
w
€
I
Id
a-
a_
X
f0
7
N
W
Z
O
Y
m
LL!
0
2
C
CO
LO
r
w
Y
O
Q