CM-2020-038 - 2/7/2020STATE OF TEXAS §
COUNTY OF WILLIAMSON §
SUPPLEMENTAL CONTRACT NO. 1
TO CONTRACT FOR ENGINEERING SERVICES
FIRM: HALFF ASSOCIATES INC. {'Engineer")
ADDRESS: 9500 Amber len Boulevard Buildine F Suite 125 Austin TX 78729
PROJECT: Chisholm VaHgl Storm Drain Improvements — Area 3
This Supplemental Contract No. 1 to Contract for Engineering Services is made by and between
the City of Round Rock, Texas, hereinafter called the "City" and Halff Associates, Inc.,
hereinafter called the "Engineer".
WHEREAS, the City and Engineer executed a Contract for Engineering Services, hereinafter
called the "Contract', on the 1 I th day of July, 2019 for the Chisholm Valley Storm Drain
Improvements -- Area 3 Project in the amount of $131,535.00; and
WHEREAS, it has become necessary to amend the Contract to modify the provisions for the
scope of services and to increase the compensation by $17,005.00 to a total of $148,540.00;
NOW THEREFORE, premises considered, the City and the Engineer agree that said Contract
is amended as follows:
I.
Article 2, Engineering Services and Exhibit B Engineering Services shall be amended as set
forth in the attached Addendum to Exhibit B. Exhibit C Work Schedule shall be amended as set
forth in the attached Addendum to Exhibit C.
lip
Article 4, Compensation and Exhibit D._Fee Schedule shall be amended by increasing by
$ I 7,005.00 the maximum amount payable under the Contract for a total of $148,540.00, as
shown by the attached Addendum to Exhibit D.
IN WITNESS WHEREOF, the City and the Engineer have executed this Supplemental
Contract in duplicate.
[signature pages follow]
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0 199,1928; 0043 8696
Rev.06/ 16
84275
HALFF ASSOCIATES, INC.
By:
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Dare
Supplemcntal Contract Rev.06-'16
0199.1928;00438696 84275
CITY OF ROUND ROCK AS TO ORM:
By:
Laurie Hadley, C ty Manager UStepha&Sheets,
City Attorney
c�?, - f7_ ea o
Date
Supplemental Contract Rev.06r 16
0199,1928;00438696 84275
City of Round Rock Chisholm Valley Drainage Assessment
Contract for Engineering Services
ADDENDUM TO EXHIBIT B
Engineering Services
1. PROJECT PURPOSE
The purpose of this supplemental to the Chisholm Valley Drainage Assessment Project Study
Area 3 is for additional services to refine the 2D Hydraulic Model for Study Area 3. The
refinement is for updating the existing and proposed analysis to utilize 2017 Lidar for better design
resolution and to utilize NOAA Atlas 14 rainfall data at the direction of the City of Round Rock.
In addition to these refinements, additional economically feasible storm drain improvements were
determined to improve capture and conveyance of storm water and reduce the flooding potential
within the Study Area 3 at the direction of the City of Round Rock.
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Figure 1. Study Area 3 Project Limits
2. SCOPE OF WORK
The scope of work for the services to be provided under this additional work effort request
includes the following tasks:
Chisholm Valley Study Area 3 Flood Mitigation Desigg
• Task 2: Site Data Acquisition
• Task 3: Preliminary Engineering Design (30%)
City of Round Rock Chisholm Valley Drainage Assessment
Contract for Engineering Services
lask 1: Project Management
• No additional effort requested.
2.1 Site Visit
• No additional effort requested.
2.2 ToRogLaphic Survey
Tasks include the following:
• Topographic survey associated with additional economically feasible storm drain
improvements on Buckskin Drive, Chisholm Valley Drive and Sagebrush Drive.
• Locate property corners for southwest property line of Wag -A -Bag on Chisolm
Valley Drive.
• Survey manholes and flowline elevations of sanitary sewer manholes within PUE
adjacent to above reference property line.
• Topographic survey of PUE and channel adjacent to above referenced property
line for potential new outfall location.
Subsurface Utility Investigation
• No additional effort requested.
Environmental Deskto Assessment
• No additional effort requested.
Task : Preliminary Engi=ringi •
Additional tasks include refinements and updates to the 2D analysis to incorporate best available
data and additional economically feasible storm drain improvements, cost estimate analysis to
determine additional improvements, and additional survey needs.
Tasks include the following:
• Update 2D hydraulic model with more detailed 2017 LiDAR data for more accurate
2D modeling results.
• Update modeling methodology to approximate standard design calculations and
methodology.
• Update 2D hydraulic model with NOAA Atlas 14 Rainfall data.
• Evaluate 2D hydraulic model for additional economically feasible storm drain
improvements for Study Area 3.
• Revise cost estimate to reflect additional economically feasible storm drain
improvements.
TTask 4: 60% Design Phase Submittal
• No additional effort requested.
City of Round Rock Chisholm Valley Drainage Assessment
Contract for Engineering Services
Task 5: 100 % Design Phase Submittal
• No additional effort requested.
Task 6: OA/OC Review
• No additional effort requested.
City of Round Rock Chisholm Valley Drainage Assessment
Contract for Engineering Services
ADDENDUM TO EXHIBIT C
Work Schedule
Halff Associated, Inc. (Halft) can commence work on this project within two weeks after notice -to -
proceed is received from the City of Round Rock.
Halff anticipates completing Work Authorization No. 3 within ten (10) months after receiving a
Notice to Proceed (NTP).
• Task 1: Project Management - 10 months
• Task 2: Site Data Acquisition - 2 months
• Task 3: Preliminary Engineering Design (30%) - 3 months
• Task 4: 60% Design Phase Submittal - 3 months
• Task 5: 100% Design Phase Submittal - 2 months
• Task 6: QA/QC - 10 month
City of Round Rock Chisholm Valley Drainage Assessment
Contract for Engineering Services
ADDENDUM TO EXHIBIT D
Fee Schedule
Hourly rates to be billed on a time and materials basis per the following Rate Schedule attached
(behind this page):
*Rates may be amended once between Nov. 1, 2018 and Nov. 1, 2019, not to exceed a 3% increase.
Chisholm Vallgy Storm Drain Improvements - Area 3
Su lemental Work Authorization #1
Exhibit D
Fee Schedule
Total
Total
Other
Task
Labor Hours
Loaded Labor Cost
Direct Costs
Subconsultams
TOTALS
Task 1: Project Management
0
S0.00
S0.00
S0.00
$0.00
Task 2: Site Data Acquisition
16
$2,455,00
$0.00
$0.00
$2,455.00
Task 3: Prcliminary Engineering Design (30%)
101
$14,550.00
$0.00
$0.00
$14,550.00
Task 4: 60% Design Phase Submittal
0
$0.00
S0.00
$0.00
$0.00
Task 5: 100% Design Phase Submittal
0
$0.00
$0.00
$0.00
$0.00
Task 6: QA/QC
0
$0.00
S0.00
$0.00
$0.00
SUPPLEMENTAL NO.ITOTAL
117
$ 17,005.00
0
0
S 17,003.00
ORIGINAL CONTRACTTOTAI.
850
S 129,360.00
2075
0
S 131,535.00
REVISED CONTRACT TOTAL:
1,084
S 146,365.00
2,175
0
$ 148,W nn
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City of Round Rock
JourvoRoac Agenda Item Summary
Agenda Number:
Title: Consider executing Supplemental Contract No. 1 with Halff Associates, Inc.
for the Chisholm Valley Storm Drain Improvements - Area 3 Project
Type: City Manager Item
Governing Body: City Manager Approval
Agenda Date: 2/7/2020
Dept Director: Michael Thane, Utilities and Environmental Services Director
Cost: $17,005.00
Indexes: 2014 Drainage Revenue Bonds
Attachments: SC#1, Map
Department: Utilities and Environmental Services
Text of Legislative File CM-2020-038
The City previously entered into an Engineering Services Contract with Nalff Associates, Inc. for
the design of the Chisholm Valley - Area 3. The scope of services for this contract includes the
design of construction plans and bidding documents for Area 3 of the proposed improvements
for the neighborhood. These improvements are necessary for reducing some of the flooding
within this area.
Supplemental No. 1 is to provide additional funding required for Task 2 - Site Data Acquisition
and Task 3 - Preliminary Engineering Design (30%) of the original design phase contract.
At the direction of the City, the scope of services for these two tasks was revised to include
updates to the modeling and revisions to the preliminary design for the purpose of including the
recently released NOAA Atlas 14 rainfall data into the model. The previous model was revised
to include this new rainfall data and the topographic survey area was extended beyond the
previously approved limits of the project in order to capture the additional areas within the
revised scope.
The current Engineering Services Contract provided for a maximum payment of $131,535.
This supplement is for $17,005 and will increase the contract to a maximum of $148,540.
Cost: $17,005
Source of Funds: 2014 Drainage Revenue Bonds
City of Round Rock Page i Printed on V712020