Ordinance No. 15,419ORDINANCE NO. 15,419
AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF BAYTOWN, TEXAS,
APPROVING THE FIRST AMENDMENT TO THE CONSULTING SERVICES
AGREEMENT BETWEEN THE BAYTOWN AREA WATER AUTHORITY AND
ARDURRA GROUP, INC., FOR THE BAYTOWN AREA WATER AUTHORITY RAW
WATER PUMPS REHABILITATION PROJECT; AND PROVIDING FOR THE
EFFECTIVE DATE THEREOF.
*************************************************************************************
WHEREAS, the Baytown Area Water Authority's enabling legislation requires that the City Council
approve the contract before Baytown Area Water Authority ("BAWA") enters into the same; and
WHEREAS, on April 5, 2023, the Board of Directors of BAWA met and approved the First
Amendment to the Consulting Services Agreement with Ardurra Group, Inc., for the Baytown Area Water
Authority Raw Water Pumps Rehabilitation Project; and
WHEREAS, the City of Baytown desires to approve such amendment; NOW THEREFORE,
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF BAYTOWN, TEXAS:
Section 1: That the recitals set forth hereinabove are hereby found to be true and correct and are
hereby adopted.
Section 2: That the City Council of the City of Baytown, Texas, hereby approves the First
Amendment to the Consulting Services Agreement between BAWA and Ardurra Group, Inc., for the
Baytown Area Water Authority Raw Water Pumps Rehabilitation Project. Such amendment is attached
hereto as Exhibit "A" and incorporated herein for all intents and purposes.
Section 3: This ordinance shall take effect immediately from and after its passage by the City
Council of the City of Baytown.
INTRODUCED, READ and PASSED by the affirmative vote of the City Council of the City of
Baytown this the 13`h day of April, 2023.
B NDON CAPETILL , Mayor
R:UCaren Anderson ORDINANCES.2023\2023.04.13WpprovinglstAmendment4BAWARawWaterPumpsRehabProject.docx
EXHIBIT "A"
Consulting Services Contract Amendment
City Of Bavtown Raw Water Rehabilitation Project
Date of Issuance: 03/14/2023 Amendment No: 01
Consultant: Ardurra Group. Inc. Project No: BAWA2103
B E T T E R PO#: 2200522
BAYTOWN
Explanation:
The following is an Amendment to the original Professional Engineering Agreement with Ardurra Group, Inc.
for the BAWA Raw Water Rehabilitation Project signed on October 151h 2021. This amendment is for the
addition of one physical scale model study for the Canal Pump Station. The scale model will be created by
Clemson Engineering Hydraulics, Inc on behalf of Ardurra Group, Inc.
During the preliminary design it was identified that both the Canal and Forebay Pump Station intakes do not
conform to Hydraulic Institute geometric standards (HI 9.8-2018). The BAWA staff have reported issues with
the pumps such as vibration and seal failures. The physical scale model study to be performed will ensure
there are no adverse hydraulic conditions present that may impact pump performance.
Description of Work
Cost
Time
1.Pump Station Intake Physical Laboratory Scale Model Study
$ 68,902.50
0 Days
2.
$ 0
0 Days
3.
$ 0
0 Days
4.
$ 0
0 Days
5.
$ 0
0 Days
Total
$ 68,902.50
0 Days
Proposal Scope/Schedule: The additional scope of work and the schedule associated with the same, are
attached hereto as Exhibit "A" and incorporated herein for all intents and purposes.
Cost & Time Change Summary: C29 Time
Original Contract: $ 789,170.06 0 Days
Previous Amendment(s): $ 0 N/A Days
Net increase (decrease) from this Amendment: $ 68,902.50 0 Days
Revised Contract: $ 858,072.56 0 Days
[Remainder of Page Purposely Left Blank]
R.Template .Design 1 of 2 D6. Revised 2: 2023
Consultant agrees to perform changes(s) included in this Contract Amendment for the price and time indicated.
The prices for changes included all costs associated with this Contract Amendment.
No work is to be done until this Amendment is executed. No payment to the Consultant shall be made for work
included in the Amendment until this Amendment is executed.
Unless a different meaning clearly appears from the context, words and phrases as used in this Amendment, the
terms and phrases as used herein shall have the same meanings as in the Agreement. The provisions of this
Amendment and the Agreement and all previous amendments, if any, shall be read together and construed as
one agreement provided that, in the event of any conflict or inconsistency, between the provisions of this
Amendment and the provisions of the Agreement and any previous amendment, the provisions of this
Amendment shall control. This Amendment has been jointly negotiated by the parties hereunder and shall not
be construed against a party hereunder because that party may have assumed primary responsibility for the
drafting of this Amendment. By this Amendment, the City does not consent to litigation or suit, and the City
hereby expressly revokes any consent to litigation that it may have granted by the terms of this Amendment, the
Agreement or any other contract or agreement or addenda, any charter, or applicable state law. Nothing
contained in this Amendment or in the Agreement shall be construed in any way to limit or to waive the City's
sovereign immunity.
The persons executing this Agreement hereby represent that each party has the full power and authority to enter
into and perform pursuant to the Amendment, and that each has been properly authorized and empowered to
enter into the Amendment.
Upon execution by all parties, the following changes identified for the Contract Value and/or Contract
Time shown, are made part of the Contract.
APPROVED:
3/20/2023
By: Date.
Consultant
Yue Sun
Printed Name
Project Director
Title
APPROVED:
M.
JASON E. REYNOLDS, City Manager
Date:
APPROVED AS TO CONTENT:
By: -7L,— r= Date:03/24/2023
FRANK O. SIMQ1VEAUX, JR., P.E-, PWE Director
APPROVED AS TO FUNDING:
By: Date:
VICTOR BROWNLEES, Finance Director
R-Temp late'.Design 2 of 2 D6. Revised 2 �2023
ARDURRA
COLLABORATE INNOVATE CREATE
March 3, 3023
Mr. Enrique Villa
Project Manager
Public Works & Engineering
City of Baytown
2123 Market Street
Baytown, Texas 77522
Subject: Proposal to Provide Professional Engineering Services
Baytown Area Water Authority Raw Water Pump Stations Rehabilitation
Request for Funding Supplement to Perform Pump Station Intake Physical
Laboratory Scale Model Study Rev1
Dear Mr. Enrique:
Ardurra Group, Inc ("Ardurra") is pleased to submit this proposal for performing a
physical laboratory scale model study of one of the pump stations (either canal or
forebay pump station) as required for the Raw Water Pump Stations Rehabilitation
project.
During the preliminary design, it was identified that both the Canal and Forebay Pump
Stations do not conform to Hydraulic Institute geometric Standards (HI 9.8-2018). Due to
reported past vibration and seal failures, it is therefore recommended that a physical
laboratory scale model study be performed to ensure that there are no adverse
hydraulic conditions present which could impact pump performance adversely during
this replacement.
The cost for the additional investigation will be a lump sum amount of $68,902.50. We
would like to proceed this work as soon as possible to keep the project on schedule.
Should you have any questions or require additional information, please feel free to
contact me at (713) 208-9463.
Very truly yours,
tV4�
Yue Sun, P.E., BCEE
Project Director
TBPE Firm Registration No F-10053
Enclosures
cc: File
3115 Allen Parkway, St 300 Houston, TX 77019 346.666.5130 : www.ardurra.com
EXHIBIT A
Raw Water Pump Stations Rehabilitation Project
Physical Laboratory Scale Modeling
SCOPE OF SERVICES
BACKGROUND
During preliminary design it was identified that both the Canal and Forebay Pump Station intakes do not
conform to Hydraulic Institute geometric Standards. Due to reported past vibration and seal failures, a
physical laboratory scale model study is recommended to ensure that there are no adverse hydraulic
conditions present which could impact pump performance during this replacement.
The general scope related to the Physical Laboratory Scale Model Study include the following
components.
PART 1— Design Phase Services
Task 1 General Project Management and Coordination— No Change to original contract
Task 2 Preliminary Design Phase— No Change to original contract
Task 3 Final Design Phase— No Change to original contract
Task 4 Physical Model Study —New Task for this project
Part 2 — Bid Phase Services — No change to original contract
Part 3 - Construction Phase Services — No change to original contract
PART 1- BASIC SERVICES
Task 4 Physical Laboratory Scale Model Study
1. Conduct a physical hydraulic model study on one of the existing Baytown Area Water Authority
WTP intakes/pump stations. Per discussion with the city, it was agreed to select one of the
pump stations (either canal or forebay Pump station) to proceed with the hydraulic modeling
study. A detailed scope of work for this effort is included in the attached proposal from Clemson
Engineering Hydraulics, Inc. which will be constructing and performing the scaled physical model
study.
2. Engineer will coordinate with Clemson to provide pump station intake record drawings, pump
station improvements plans, pump specs, and pump data sheets etc. for use to construct the
physical model. Upon completion of the modeling, Engineer will review the draft study report
prepared by Clemson and provide review comments.
3. Based on findings and recommendations from the scaled physical model study, Engineer will
incorporate modifications to the pump replacement and update plans in the design documents.
4. It is assumed the findings and recommendations from the selected pump station study will be
applied to the other pump station. Should the results suggest a separate model study be
performed for the other pump station, a separate amendment will be requested.
A-1
Exhibit B
Level of Effort
EXHIBIT C — SCHEDULE
Raw Water Pump Station Rehabilitation
Schedule
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EXHIBIT D - DETAILED SCOPE OF WORK
�CEH
CLEMSON 1203 River Heights Cirde • Anderson, SC 29621
ENGINEERING
HYDRAULICS, INC 864.231.9585
August 2, 2022
Mr. Bryce Brady
Ardurra
Ref: Baytown Water Authority WTP Canal and Forebay Pump Station Physical Models
Dear Mr. Brady,
Thank you for the opportunity to provide you with a quotation to conduct the physical
hydraulic model study of the existing Baytown Water Authority WTP Canal and Forebay
pump intakes. CEH has enjoyed working with Ardurra on previous modeling projects. We
have extensive experience with pump intakes including numerous vertical pump
applications in water treatment facilities. Our lab is fully equipped for this type of project
and will fully comply with the ANSI 2018 Hydraulic Institute Standards.
INTRODUCTION
Ardurra has requested that Clemson Engineering Hydraulics, Inc. (CEH) prepare a
proposal to conduct a physical hydraulic model study of the existing Baytown Water
Authority WTP Canal and Forebay pump intakes. Both intakes house four (4) pumps with
Forebay Pumps 1-4 and Canal Pumps 1-2 each rated at 7,000 gpm and Canal Pump 4
(Bypass Pump) rated at 17,000 gpm. Ardurra is planning to replace all pumps with equal
capacity pumps. Given that the intake does not conform to Hydraulic Institute geometric
standards, and some reported past vibration and seal failures, a physical model study is
being proposed to ensure that there are no adverse conditions present which could impact
pump performance
SIMULATING BOTH INTAKES
Given the differences in pump sizes and the geometry differences between the intakes, both
intake structures will be evaluated as separate models with all four pumps simulated in
both intakes.
DESIGN REVIEW - PROJECT SCHEDULE AND LAB AVAILABILITY
With our current backlog we will we can conduct the initial design review and start model
design and drawings immediately but a model basin may not be available until late October
or early November. CEH anticipated being able to complete the study in 8 to 10 weeks
once model basin space is available. As you may be aware, we have recently acquired
60,000-ftz of additional modeling space. This space is now fully operational as shown in
the photo below.
Photo 1 A Portion of 60,000-ft2 of New Lab Space Immediately Available for This Project
MODELING EXPERIENCE
CEH has extensive pump station physical modeling experience and has completed over
1000 large scale pump intake models including many cooling tower intakes for Ardurra.
The photos below show several recent studies demonstrating our ability to simulate
complex upstream geometries, complex piping and large-scale models. The photos below
are from the recent models.
Photo 2 CEH Frequently Simulated Open Unconfined Intakes
Photo 3 Similar Unconfined Intake with Flow Conditioning Baskets
Photo 4 Unconfined Pumps Can Generate Strong Interaction / Vortex Activity Between Pumps
Photo 5 CEH Has Complete In -House Acrylic Fabrication Capability
Photo 6 CEH Can Simulate Any Screens and Approach Flow Channel Geometry
Photo 7 CEH Has Experience with All Types of Pumps Intakes Including Can Pumps
CEH Has Modeled Hundreds of Cooling Tower Intakes
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ASSUMPTIONS
The following assumptions were made during the preparation of this proposal:
1. All eight pumps will be simulated in detail (four in each intake)
2. Both intake structures will be simulated. The upstream model boundary will be the
openings into the intake.
3. Testing will be conducted in accordance with the 2018 HI standards.
4. Modifications will be developed which will not impact the overall foot -print or size
of the intake. These modifications may include fillets and splitters, floor cones,
curtain walls, baffling, and other similar devices.
SCALE SELECTION
To obtain accurate results from a model study, there must be dynamic similitude between
the model and the prototype. To satisfy this requirement, there must be exact geometric
similitude. In addition, the ratio of the dynamic pressures must also be maintained. Strictly
satisfying dynamic similitude requires a 1:1 scale model. This is usually not feasible, so
some compromise is made. To accomplish this, geometric similarity is maintained and the
dominant forces associated with the prototype are determined and maintained between the
model and prototype.
The primary forces that affect fluid flow are viscosity, surface tension, velocity (inertial),
pressure, gravity and elastic forces. In structures with a free surface, such as a pump intake,
gravitational and inertial forces are far greater than the viscous and turbulent shear forces.
Therefore, when modeling free surface structures, geometric similarity and the ratio of
inertial to gravitational forces, or the Froude number, is maintained between the model and
prototype.
Simply holding the Froude number constant violates the strict definition of dynamic
similitude. However, if the model is operated within a high enough range of Reynolds
numbers, viscous and surface tension scale effects may be minimized. The 2018 Hydraulic
Institute Standards (ANSI 9.8-2018) recommends that the minimum Reynolds number at
the bell be greater than 6 x 104. Therefore, when choosing the model scale, it is necessary
to ensure that the scaled flow rate will result in a high enough Reynolds number to
minimize scale effects.
Based on the above discussion, a Froude scaled, undistorted and geometrically similar
model with a scale of 1:4 is anticipated for this study (scale to be finalized when additional
pump information is made available). This scale will result in Reynolds numbers on the
order of 1 x 10' at the suction bell. A scale will be selected that ensures the Reynolds
numbers exceed Hydraulic Institute Standards. The final scale will be determined when the
detailed pump bell information is made available.
PERFORMANCE CRITERIA
It is proposed that the following acceptance criteria be used for this model study:
1. No organized free surface or submerged vortices greater than a Type 1 (general
rotation) should be permitted at Froude scaled flow rates
2. Pre -swirl should be less than 5-degrees four diameters (per HI) downstream of
the pump impeller location.
3. Time averaged velocities within the pump throat should deviate less than 10
percent of the cross -sectional area average velocity
4. Time -varying velocity fluctuations (turbulence) at a point within the pump
throat should be less than 10 percent
INSTRUMENTATION AND DATA COLLECTION
The following data will be collected and recorded for each test:
Flow Rate — The total model flow rate will be determined with an ASME
standard orifice meter. Individual pump flow rates will be measured with elbow
meters calibrated in -situ or other suitable flow meters with an accuracy of +/- 2
percent or better.
2. Water Levels — The water level in the pump sump will be recorded with a point
or staff gauge with an accuracy of 3 mm (.01 ft) or better.
3. Vortices — Vortex formation will be visually observed. Dye will be used to aid
in the visualization of vortex formation. Digital photographs and video footage
will be used to document vortex formation.
4. Velocities — Velocity fluctuations and turbulence levels will be measured in the
pump throat of one pump throat of each size. The velocity meter will be
capable of measuring the axial component of the flow velocity and will have a
repeatability of +/- 2-percent. The velocities will be measured on a constant
radius, at 8 points around the pump throat.
Pre -Swirl — A swirl meter will be installed four throat diameters (per HI)
downstream of the impeller location for each circulating water pump. Each
swirl meter consists of 4 straight free -spinning vanes mounted on a shaft with
low friction bearings.
MODEL LIMITS
The upstream model boundary is assumed to be the inlet to each wet well. The
downstream model boundary will be the entrance to the pump impeller. The entire
intake structure housing the pumps will be simulated. The model head box, floor, and
sidewalls will be constructed with waterproof wood. The model pumps, intake piping
and pump bells will be fabricated out of clear acrylic up to the impeller location. The
additional piping will be fabricated out of PVC pipe.
The suction piping will be fabricated from PVC pipe. Valves will be used to control
the individual pump flows as well as the total model flow. A pump will be installed
downstream of the model pumps to re -circulate flow back to the model head box. Flow
straightening devices will be installed as necessary to ensure that flow entering the
model head box is uniform. Friction losses within the model limits are negligible
compared to form or boundary losses. Therefore, it is assumed that materials mentioned
above will be appropriate for model construction.
Model design drawings will be prepared and submitted to Ardurra for approval prior to
construction. The overall model basin will be constructed with a tolerance of +/- 6.4
model mm (0.25-in). The model pumps will be constructed to within +/- 1.5 model mm
(0.06 in).
TEST PROGRAM
The model testing will be carried out in four phases. The actual test conditions will be
determined with additional input from the pump manufacturer, design engineer, and
end user. Each phase is described below:
I. Baseline tests — Baseline tests will be conducted with the original intake
design. It is anticipated that 6 baseline tests will be conducted (for each side),
and the data mentioned in the instrumentation and data collection section of
this proposal will be collected during each test. The worst -case conditions will
be determined during this phase of testing. These tests will be used to
determine the nature and severity of hydraulic phenomena occurring within
the pump intake structure.
2. Modification Tests — Modification tests will be conducted and modifications
will be performed to bring the pump intake within the performance criteria.
All proposed modifications would be presented to Ardurra for approval.
Approximately 2 weeks have been allocated to modification testing. Changes
will be limited to non-structural modifications such as fillets and splitters,
floor cones, curtain walls, baffling, and other similar devices that will not
impact the overall size and shape of the intakes.
3. Witness Test — Following modification testing, a one -day witness test (in -
person or virtual) can be held at Clemson Engineering Hydraulics facility to
demonstrate the models with and without the proposed modifications.
Preliminary modification drawings will be available at the witness test.
Representatives from Ardurra and their clients are encouraged to attend this
test. Travel costs associated with Ardurra and their clients attending this test
are not included in this proposal. We can also provide an intermediate video
in place of a witness test so that the results can be viewed prior to any final
testing.
4. Documentation Tests — Following the witness test, it is anticipated that up to
12 documentation tests will be conducted to document the performance of the
pump intake with the recommended modifications in place. The cost of
evaluating the performance of the intake with the proposed modifications is
included in this proposal.
REPORTING
CEH will prepare a project report containing methodology, procedures, conclusions and
recommendations, as well as all data and documentation acquired during the testing for
each of the intakes. A draft report will be made available at the witness test. Raw video
footage of the testing will be provided in DVD format.
SCHEDULE
Given our current backlog, CEH anticipates starting modeling in early November and
having results near the end of December or early January. The final report will be issued
approximately one week after the witness test. CEH will work with Ardurra to ensure all
critical deadlines are met and if necessary, revise the schedule to accommodate required
due dates. A detailed schedule will be provided once an actual start date has been
determined.
PERSONNEL
Dr. David Werth, Ph.D., P.E. will serve as the project manager and principal investigator
for this study as well as the primary technical contact. Dr. Werth has conducted and
managed over 1000 physical model studies of pump intake structures. Dr. Werth will be
responsible for all phases of this project including model design and construction, testing
and data collection, modifications, reporting, and quality assurance.
Mr. Ken Davy will be responsible for model construction and will manage the model
operation. Mr. Davy has been responsible for the construction and operation of over 600
hydraulic model studies of pump intakes and has extensive experience in pump sump
modeling. Additional technicians are available and may assist in model construction and
instrumentation under the direct supervision of Dr. Werth and Mr. Davy.
Mr. Matthew Havice, P.E. will serve as the project engineer. Mr. Havice holds a master's
degree in Applied Fluid Mechanics and has over 15 years of physical modeling experience
and has worked on over 600 pump intake models. Additional technicians are available and
may assist in model construction and instrumentation under the direct supervision of Dr.
Werth and Mr. Davy.
Mr. Wylie Donich will serve as the project engineer. Mr. Donich holds a Bachelor's degree
in Mechanical Engineering and has worked on over 20 pump intake models under the
supervision of Mr. Havice.
CLEMSON ENGINEERING HYDRAULICS, INC.
Clemson Engineering Hydraulics, Inc. (CEH) was "spun -off' from the successful
modeling program developed by Dr. Werth and Mr. Davy at Clemson University. The
company was formed to provide a larger more efficient physical hydraulic modeling
program. CEH has relocated their modeling program to a much larger and better equipped
60,000 ft2 facility just a few miles from the previous hydraulics lab located at Clemson
University. The facility is fully equipped and staffed with significantly more physical
modeling capabilities than those previously available at the university.
If needed, the following vender information is provided:
Company Name: Clemson Engineering Hydraulics, Inc.
Tax EIN: 20-5871960
Mailing Address: PO Box 1267, Anderson, SC 29622
Physical Address: 1203 River Heights Circle, Anderson SC 29621
Phone: 864-231-9585
Contact: Dr. David Werth, Ph.D., P.E.
COSTS
A separate attachment outlining the fixed price costs to conduct this study has been
included for your review. This price includes the cost of all testing, including
documentation testing to verify the performance with the proposed modifications in place.
CEH proposes the following invoicing schedule, but will be happy to negotiate if
necessary:
• 100 % upon submittal of the final report (net 30 days)
Invoices not paid within 30 days are subject to interest from the 31 st day at the rate of 1.5
percent per month (18 percent annum) but not to exceed the maximum interest allowed by
law. In addition, CEH may, after giving 7 days written notice to client, suspend services
without liability until the client has paid in full all amounts due on account of services
rendered and expenses incurred including interest on past due invoices, or terminate
services without liability. If there is a disputed amount on an invoice, client agrees to pay
all undisputed amounts in the 30-day period. In the event that CEH places client's account
in the hands of the attorney for collection, client agrees to pay CEH all fees and expenses,
including attorney's fees.
Costs have been estimated with the assumption that Ardurra will provide all information
required for the model study. Ardurra will be responsible for the accuracy and completeness
of the information. The owner retains responsibility for integrating any recommendations
into the final design. CEH is not responsible for implementation, construction, or operation.
CEH agrees to conduct this study based on commonly accepted physical modeling
procedures as outlined in the 2018 Hydraulic Institute Standards and provide such services
on a best faith effort. CEH warrants that the study will conform to the 2018 Hydraulic
Institute standards, as well as commonly accepted physical hydraulic modeling practices.
CEH makes no other warranty, express or implied, and shall have no other liability to
Client.
Clemson Engineering Hydraulics, Inc. looks forward to the opportunity to once again work
with Ardurra. In the event that any of the assumptions or technical aspects of this proposal
are invalid, or need clarification, please feel free to contact us at 864-231-9585 or by e-
mail at dwerth@ceh-lab.com. We look forward to hearing from you.
Sincerely,
David E. Werth, Ph.D., P.E.
President, Clemson Engineering Hydraulics, Inc.
Matthew Havice, P.E.
Senior Project Manager
CEH
CLEMSON
ENGINEERING
HYDRAULICS
FIXED PRICE BUDGET
CANAL PUMP STATION
Simulate Four Pumps In Detail
Fixed Price = $55,000
This price includes all construction, testing, reporting and witnessing
Price includes as many modification tests as necessary to meet HI Standards
THIS IS A FIXED PRICE BUDGET
Cost Breakdown
Model Design / Administration $5,500
Model Construction $26,400
Model Testing $19,250
Reporting $3,850
TOTAL $55,000
DISCOUNT IF FOREBAY PUMP STATION IS ALSO MODELED
Canal Model Discount = $ (5,000.00)
CEH
CLEMSON
ENGINEERING
HYDRAULICS
percent
value
design/admin
10%
$5,500
construction
48%
$26,400
initial
10%
$5,500
mods
15%
$8,250
dots
10%
$5,500
reporting
7%
$3,850
total
100.00%
$55,000