CM-2026-078 - 3/20/2026 STATE OF TEXAS §
COUNTY OF WILLIAMSON §
SUPPLEMENTAL CONTRACT NO.3
TO CONTRACT FOR ENGINEERING SERVICES
FIRM: ARDURRA GROUP,INC. ("Engineer")
ADDRESS: 3115 Allen Parkway, Suite 300,Houston,TX 77019
PROJECT: Stone Oak Pump Station Modifications
This Supplemental Contract No. 3 to Contract for Engineering Services is made by and between
the City of Round Rock,Texas, hereinafter called the"City"and Ardurra Group, Inc., hereinafter
called the "Engineer."
WHEREAS, the City and Engineer executed a Contract for Engineering Services, hereinafter
called the"Contract,"on the 16th day of April,2021 for the Stone Oak Pump Station Modifications
Project in the amount of$34,970.00; and
WHEREAS,the City and Engineer executed Supplemental Contract No. 1 on March 24,2022 to
amend the scope of services and to increase the compensation by $139,100.00 to a total of
$174,070.00; and
WHEREAS,the City and Engineer executed Supplemental Contract No. 2 on August 23,2025 to
amend the scope of services and to increase the compensation by $11,699.00 to a total of
$185,769.00; 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 $85,210.00 to a total of$270,979.00;
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.
II.
Article 4, Compensation and Exhibit D, Fee Schedule shall be amended by increasing by
$85,210.00 the maximum amount payable under the Contract for a total of$270,979.00,as shown
by the attached Addendum to Exhibit D.
Supplemental Contract Rev.06/16
0199.202106 84275
CM— ?.0Z(o -01g
IN WITNESS WHEREOF,the City and the Engineer have executed this Supplemental Contract
in duplicate.
[signature pages follow]
Supplemental Contract Rev.06/16
0199.202106 84275
2
ARDURRA GROUP, INC.
By:
Yue Sun
Printed Name:
Title: Project Director
Date Signed: March 13, 2026
Supplemental Contract Rev.06/16
0199.202106 84275
3
CITY OF 44-44°2,10--enN.---
ROUND ROCK APPROVED AS TO FORM:
By:
� Stephanie L. Sandre, City Attorney
Printed Name: &di V ` 1
Title: ,/` TikrL4 c4 y 9 c.
Date Signed: 3f).1)J.ZC
Supplemental Contract Rev.06/16
0199.202106 84275
3
ADDENDUM TO EXHIBIT B
Engineering Services
Attached Behind This Page
Exhibit B Detailed Scope of Engineering Services
SCOPE OF SERVICES
FOR
CITY OF ROUND ROCK
STONE OAK PUMP STATION MODIFICATIONS
CONSTRUCTION PHASE SERVICES
SCOPE OF WORK
The scope of work presented below describes the basic level of services for construction phase services.
Unless noted otherwise,all deliverables will be electronic PDF.
Task 4.0—CONSTRUCTION PHASE SERVICES
4.1. Project Management
Engineer shall oversee the delivery of the construction phase tasks for the Project. This task
includes the Engineer's coordination with the City staff and selected General Contractor to
manage the delivery of the work outlined in this scope of work. The Engineer will perform the
duties of the project oversight and reporting to provide updates on the following items: project
performance, schedule updates, budget tracking, monthly status reports and project invoicing.
Engineer will track and update the budget,schedule, progress of work and potential changes to
the scope of work.Engineer will provide a project status report and submit with monthly invoice.
The project status report will include summary of work completed to date,work planned for the
upcoming month and schedule update as needed. It is assumed that construction duration will
include fifteen (15) months from start to substantial completion, and one (1) more month to
final acceptance based on a construction duration of 480 calendar days.
4.2. Meetings
4.2.1. Pre-Construction Meeting: Engineer will attend a virtual pre-construction meeting to
provide information and answer questions.
4.2.2. Monthly Progress Meetings: Engineer will attend monthly construction progress meetings
and site visits.The level of effort for this task assumes that ten (10) monthly progress
meetings will be attended virtually and six (6) monthly progress meetings will be attended
in person. It is assumed that each meeting will be one hour in duration. Meeting agenda
and sign-in sheet will be provided by Others. In conjunction with monthly progress
meetings, Engineer will make site visits to observe as an experienced and qualified design
professional,the progress and quality of the various aspects of Contractor's work.Such
visits and observations by the Engineer are to include spot checking, selective review, and
similar methods of general observations of the work based on Engineer's exercise of
professional judgement. Based on information obtained during such visits and such
observations, Engineer shall endeavor to determine in general if such work is proceeding
in accordance with the Contract Documents. Construction Management and field
inspection services will be provided by the City.
A-1
ARDURRA
Exhibit B Detailed Scope of Engineering Services
4.3. Submittal,Substitution, RFI and WCD Review
4.3.1. Engineer will review and comment on Contractor's submittals, RFIs and WCDs including
coordination with the City on Change Directives and Change Orders. The scope of work
assumes up to 70 total submittal and resubmittal reviews, 15 RFI reviews and two(2)WCD
reviews.
4.3.2. Engineer will evaluate and determine the acceptability of substitute materials and
equipment proposed by the Contractor and make recommendations to the City as to their
acceptance or rejection.The scope of work assumes up to two (2) individual substitution
evaluation.
4.4. Substantial Completion and Final Acceptance
4.4.1. Engineer will review progress of work for Substantial Completion (in the form of a
Substantial Completion walkthrough inspection);with production of punch list;
substantiation that items are completed; and issue Certificate of Substantial Completion
with concurrence of the City.
4.4.2. Engineer will conduct a final inspection to substantiate that the completed work of the
Contractor is acceptable to certify work completion and issue Certificate of Final
Acceptance with concurrence of the City.
4.5. Pay Application Review
Engineer review and approve Contractor pay applications coordinating with City Construction Manager.
Construction Management and Inspection services are provided by Others.
4.6. Record Drawings
Engineer will coordinate with Contractor to obtain complete record of as-built "redlines." Engineer
will prepare Record Drawings from Contractor's as-built "redlines" in electronic PDF and hard copy
format.
4.7. Factory Witness Testing
4.7.1. Factory Acceptance Test(FAT): Per specification Section 40 61 21, Engineer to witness the
FAT for the pump control panel provided by the Contractor/Process Control System
Integrator(PCSI)to verify that the panel meets all specified functional, performance, and
integration requirements as a complete integrated system prior to shipment.The FAT shall
be conducted at the PCSI's facility and witnessed by the Engineer and/or City. PCSI shall
provide all supporting documentation including approved submittals, drawings, and
factory test procedures.Testing will include verification of system hardware and software,
inspection of control panels and network components,full I/O point testing,
demonstration of system backup and recovery procedures,and validation of all control
logic and fault handling.All deficiencies must be resolved and retested to the satisfaction
of the Engineer and/or City prior to shipment. Upon successful completion, a signed FAT
Status Signoff form shall be submitted for record.
4.7.2.Operational Readiness and Functional Demonstration Testing(ORT/FDT): Per specification
A-2
ARDURRA
Exhibit B Detailed Scope of Engineering Services
Section 40 61 21, Engineer witness the ORT/FDT to verify and certify that the installed
Process Control System (PCS), including all instrumentation,control panels,field wiring,
and process interfaces, is fully functional, properly configured, and ready for continuous
operation.These tests are witnessed by the Engineer and/or City and serve as critical
milestones prior to site acceptance and system turnover. Successful completion of the
ORT/FDT confirms that the PCS is fully operational and ready for Site Acceptance Testing
(SAT), pending submittal of all required documentation and test results.
A-3
ARDURRA
ADDENDUM TO EXHIBIT C
Work Schedule
Attached Behind This Page
Exhibit C. Work Schedule CITY OF ROUND ROCK
STONE OAK PUMP STATION MODIFICATIONS
CONSTRUCTION PHASE
ID Task Name I Duration I Start I Finish (Predecessors Qtr 4,2025 Qtr 1.2026 Qtr 2 2026 Qtr 3,2026 Qtr 4,2026
1 Stone Oak Pump Station Modifications 387 days Thu 11/6/25 Fri 11/27/26
2 Construction Phase 387 days Thu 11/6/25 Fri 11/27/26 I
3 Contractor Notice to Proceed 1 day Thu 11/6/25 Thu 11/6/25 11/6
4 Mobilization 5 days Thu 4/9/26 Mon 4/13/26
5 Engineering Services during 325 days Sun 11/9/25 Tue 9/29/26 3FS+2 days
Construction 1
6 Engineering Services during 325 days Sun 11/9/25 Tue 9/29/26 3 ......:...._..._.:...___,._,....,........,..,..igti i:X:..............,_._,_._......
Construction(shop drawing
reviews,RFI reviews,construction
progress meetings,site visits etc.)
7 Final Completion 59 days Wed 9/30/26 Fri 11/27/26
8 Substantial Completion and Walkthr 7 days Wed 9/30/26 Tue 10/6/26 6
9 Punchlist 30 days Wed 10/7/26 Thu 11/5/26 8 .......
10 Final Completion 1 day Fri 11/6/26 Fri 11/6/26 9 ♦ 11/6
11 Contractor As-built Redline 15 days Wed 10/14/26 Wed 10/28/26 :his
Updates and Submission
12 Record Drawings Development 30 days Thu 10/29/26 Fri 11/27/26 11
Task itiMiliViarMiriatiW Inactive Task Manual Summary ♦
Split ,,,,,,�,.,,...—,...,„, Inactive Milestone Start-only
Milestone Inactive Milestone I 1 Finish-only wilmorp
Project:Stone Oak Pump Station Mod
Date:Wed 3/11/26 Summary 1111. Inactive Summary External Tasks
Project Summary Manual Task O Extemal Milestone MINEMill
External Tasks P' » ::::WE > € : Duration-only Progress
External Milestone • Manual Summary Rollup • Deadline b
Page 1
ADDENDUM TO EXHIBIT D
Fee Schedule
Attached Behind This Page
EXHIBIT D FEE SCHEDULE
City of Round Rock
Stone Oak Pump Station Modifications
Construction Phase-level of Efforts Fee Estimate
Other Press Costs
Ilnbding
a OC St
Prom rtecnmral r Eng cossuromo r Mauna
Project - wdur.a Subtotal Labor ..rRTOMS Co n travel Total
Pos., Principal Specialist So PM Proj Eng. fIT 'Electrical) (Herrn.) Proj.o Eng Proj Eng.06q Inspector Mrn n CAD Demmer n ndm Total Noun Con expanses} Mauna Subtotal Sues)
Rare 5 225.00 $ 275.00 5 275.00 $ 18000 5 140.00 5 260.00 5 160.00 5 260.00 5 16000 5 180.00 5 ts0oU 5 120.00 5 00.00 (0r2) I$1 1$I ($1 ($1
Task )subtast [Task...Man -
BASIC SMVKS
4.1 PTalett Matlag.nwm
Project Management and Coordination(assumes 16 mos.
4.1.1 duration) 8 16 24 5 5.IY0.80 $ S.080.00 $ 511800D
Project monthly progress report and invoicing(Assumes 16
4.1.2 mos.Durance) 8 8 16 32 5 s,010.00 $ 5,080ID 5 5,04000
u eMetko $ -
4.2.1 attend virtual pre-construction meeting _ 2 2 a 5 910.00 $ 910A0 $ 910.OD
Attend construction progress meetings(6 in-person,10
4.2.2 virtual) 32 68 12 12 124 $ 27,280.00 $ 27,28000 $ 27.28000
lS Submittal,Rai,WCD Review 5
4.3.1 Submittals(up to 20 submittals 6 lesubmOlals( 8 IS60 10 18 a 16 135 $ 23,420.00 $ 23,42003 $ 23,420.00
4.3.2 Substitution R.vwv(up to 2) • 8 5 1,820.00 $ 1,1120.00 $ 1,82000
4.3.3 RPI Renew and Response(up to 1S) 5 10 IS 3 l 4 2 .2 $ 7,6600 5 7,195.00 $ 2,895.00
4.3.4 WC0 Renew and response(up to 2) 2 6 8 5 1.630.00 $ 1,630.00 $ 1,630.00
4.4 Substantial Completion and Fins)ato.ptresi 5
4a.1 Substantial cumMetion waldhrough and punch Est 8 a 8 8 8 16 S6 $ 10.840.00 $ 10,840.00 $ 10,M0.00
4.4.2 final completion inspection and final acceptance 8 a 8 a 32 5 6,560.00 $ 560.00 $ 6,560.00
4.S Pay application Review 16 16 $ 2,88000 $ 2.880.00$ 2,88000
4.6 Record Drawings 2 - 2 6 2 5 2 5 18 42 $ 2,03000 5 2.090.60 $ 7,000.00
4.) 8a.tory Witness Testing 16 16 5 4,160.00 $ 00 $ 4,160.00
Project Task f sunrises(10%on Subtotal Ins Cost) $ 10,465.00 $ 10.46500 $ 10.a6500
BASIC SERVICESSINTOTAL $ 115.110.00
B.CDMSTIucnoN MME SERvIRS PER SUPPLEMENTAL MICMACT NO.1 $ _
C POWER SYSTEM STUDIES PER SUPPLE 1 5
TOTAL 11E55 a AND CI 5 35.210.00
ARDURRA P.4,I o,I