HomeMy WebLinkAboutC2016-617 - 11/29/2016 - NA •
CITY OF CORPUS CHRISTI
AMENDMENT NO. 1
CONTRACT FOR PROFESSIONAL SERVICES
The City of Corpus Christi, Texas, a Texas home-rule municipal corporation ("City") and Hazen and Sawyer
("Consultant"), agree to the following amendments to the Contract for Professional Services for City of Corpus
Christi Water System Assessment and Optimization (Project No. E16332):
Original Contract July 26, 2016 i Ordinance No. 030904 $500,000
In the Original Contract, Exhibit"A", Scope of Services shall be amended as set forth in the attached Amendment
No.1, Exhibit"A".
In the Original Contract, Fees Section,shall be amended based on the modified scope of services in the attached
Amendment No. 1, Exhibit"A"for a fee not to exceed $453,000, for a total restated fee not to exceed $953,000.
All other terms and conditions of the July 26, 2016 Contract for Professional Services between the City and
Consultant,and of any amendments to that contract,which are not specifically addressed herein shall remain in full
force and effect.
CITY 77 . C 'RI Iop
HAZEN AND SAWYER
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J.H. dmonds, P.E. at Chamindra ssanayake(fh.D., P.E. Date
Director of Engineering Services Vice President and Southwest Regional Manager
8350 N. Central Expressway, Suite 775
Dallas, Texas 75206
(214) 382-5750 Office
APPROVED AS TO LEGAL FORM
( di Aimee Alcorn-Reed
2016.11.21 10:13:30-06'00'
Assistant City Attorney Date
ATTEST
2
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City Secretary Date
Project Number E16332 •
Accounting Unit 4480-062
Account 550950
Activity El 6332-01-4480-EXP
Account Category 50950
Fund Name Water Capital Rsv
2016-617
11/29/16 _,a2_, ,;,-2-2,-rH; V-SS_SSMENT a:.L Jo... 1 .,i•. 1NUME'+" 42 17,:i.
Hazen and Sawyer
INDEXED
Hazen
November 7, 2016
J.H. Edmonds, P.E.
Director of Engineering Services
City of Corpus Christi
P.O. Box 9277
Corpus Christi, TX 78469-9277
Re: AMENDMENT NO. 1
CITY OF CORPUS CHRISTI WATER SYSTEM ASSESSMENT AND OPTIMIZATION
City Project No. E16332
Hazen Project No. 60704-001
Dear Mr. Edmonds:
The following Amendment No.1 is part of the Resolution approved by City Council on July 26, 2016
pertaining to the authorization to declare emergency and expedite procurement of goods and
services associated with water quality. The resolution called for declaring an emergency and
expediting the procurement of goods and services necessary for water quality improvements in an
amount not to exceed $2,720,000, and authorizing the City Manager, or designee, to execute all
documents necessary for these emergency procurements pursuant to State law and Article ) �
Section 2 of the Charter of the City of Corpus Christi.
In response to the City's request, Hazen and Sawyer is proposing the following Amendment No. 1
to supplement the original contract for a total-not-to-exceed amount of$453,000 to be billed on a
Time-and-Materials(T&M)basis,which brings the total contract amount to$953,000.The purpose
of Amendment No. 1 is to add un-scoped Additional Services related to the design and
implementation of several recommended improvements to the City's water system that emerged
from the execution of the original contract. This amendment will also revise the total project fee.
Project Description:
The City of Corpus Christi, Texas, hereinafter called "City", and Hazen and Sawyer, hereinafter
called "Engineer", agree to the following amendment for engineering and consulting services to
perform tasks related to the design and implementation of recommended improvements to the
monitoring, operations, and maintenance of the City's water treatment plant and distribution
system. The Engineer shall assist the City by performing the tasks outlined in this amendment
under the direction of the Utilities Department to ensure that the water treatment and distribution
objectives for the City are being met in a cost-effective manner.
EXHIBIT"A"
Page 1 of 9
•
•
Scone of Services:
The following tasks will be performed as"Additional Services" under this amendment:
3.Water Storage Tank Sampling and Monitoring Program
This task allows for detailed sampling to be conducted in the elevated storage tanks (ESTs) and
the ground storage tanks (GSTs) throughout the water distribution system. The objective of this
water sampling is to investigate the variability in the disinfectant residuals throughout the depth of
ESTs and GSTs and to identify the presence of stratification. For each sampling event, a total of
four(4)grab samples will be taken at the following depths:
• 0% of the tank water level (top of the tank)
• 25% of the tank water level
• 50% of the tank water level
• 100% of the tank water level (bottom of the tank)
Each sample will be monitored for pH, temperature, disinfectant residual, and other nitrification-
related parameters (i.e., nitrite). The following water storage tanks are anticipated to be included
in the sampling program:
• Staples PS
• Morgan EST
• Alameda EST
• Gollihar EST
• Flour Bluff EST
• Coral Vines EST
To ensure that consistent water quality arid tank operations are present, a total of ten(10)sampling
events will occur each week for approximately six (6) weeks. With this sampling plan, a total of
approximately 60 sampling events will be conducted. At the conclusion of the program, a technical
memorandum will be submitted to the City, which will summarize the results and identify any
potential issues that may need to be addressed by the City.
4. Granular Activated Carbon (GAC) and Nanofiltration Pilot Plant Operations
The purpose of this task is to provide the City with a due diligence study to obtain the necessary
data to determine if GAC or nanofiltration may be installed at ONSWTP, which would allow for the
use of free chlorine as a secondary disinfectant.This task will also provide additional design criteria
required to properly size a full-scale GAC or nanofiltration facility.The GAC or nanofiltration system
is intended to have the following benefits for ONSWTP:
EXHIBIT"A"
Page 2 of 9
•
•
• Removal of organic matter from the ONSWTP source water to reduce disinfection
byproduct precursors
• Elimination of nitrification in the distribution system by allowing for the use of free chlorine
as a residual disinfectant in the distribution system
• Inclusion of an additional treatment technology at ONSWTP to address emerging
contaminants
This task is proposed to be conducted in three (3) phases:
A. Planning Phase — During this phase, the Engineer will assist the City in coordinating the
procurement of a pilot plant system and the preparation of a new building for the pilot plant.
The Engineer will also develop the testing plan, which will outline the testing criteria and
the sampling requirements.The services to be provided during this phase may include, but
are not limited to, the following:
• Testing criteria calculations
• Coordination with laboratories for sampling
• Coordination for the construction of a new pilot building
• Coordination with pilot plant vendors on design criteria
The following submittals to the City will be provided during the design phase:
• Pilot Testing Plan
B. Start-up and Piloting Phase—During this phase, the Engineer with coordinate the start-up
testing and regular operations of the pilot plant system. The Engineer will operate the pilot
facility with daily site visits for approximately 6 months to obtain sufficient water quality data
during various seasons and water quality conditions. The services to be provided during
this phase may include, but are not limited to, the following:
• Daily operation of the pilot equipment in accordance with the testing plan
• Troubleshooting and maintenance of the pilot plant system
• Coordination related to the packaging and shipment of water samples to external
laboratories
• Data analysis and trending of pilot plant data
The following deliverables will be provided during this phase:
• "Monthly Snapshot" memoranda to provide updates on the piloting progress and
results
C. Final Reporting Phase and Operator Training — During this phase, the Engineer will
summarize the results from the piloting study into a final report. The services to be provided
during this phase may include, but are not limited to, the following:
EXHIBIT"A"
Page 3 of 9
• Final analysis and reporting of pilot data
• Training of ONSWTP staff for use of the pilot plant equipment
• Development of an operating document for the pilot system
The following deliverables will be provided during this phase:
• Final Pilot Report
• Workshop with City to discuss final results of pilot and decide next steps
• 5. Chlorine Dioxide(CIOs) System Implementation at O.N. Stevens Water Treatment Plant
The purpose of this task is to provide the City with the necessary documentation to install and
operate a new CIO2 system to augment the existing water treatment processes that are currently
employed at ONSWTP. Following TCEQ's approval of the City's Exception Request, the
implementation of C102 into the water treatment trains at ONSWTP would provide the following
benefits:
• Reduction in overall chlorine demand, which would result in reductions in pre-
chloramination dosing
• Improved control of nitrification in the water distribution system
• Reduced potential for disinfection by-production formation, particularly the formation of
THMs
This task is proposed to be conducted in four(4) phases:
A. Design Phase-During this phase,the Engineer would develop the necessary construction
drawings, contract documents, and specifications for the installation of the new CIO2
system at ONSWTP, including the containment areas, chemical feed systems, and
associated piping and valves. The following submittals to the City will be provided during
the design phase:
• Pre-Final Submittal: The Engineer will prepare and submit contract documents,
including front-end documents, construction drawings, and preliminary
specifications,which have been developed to a 100%level of completion,for review
and comment by the City.
• Final Design Submittal: The Engineer will prepare and submit the Final Design
Submittal, which will consist of a final set of signed and sealed construction
drawings and project specifications that have addressed the City's comments from
the Pre-Final Submittal. Along with distributing these final documents to the City
staff, the Engineer will prepare these documents for bidding purposes.
• Permitting Documentation: The Engineer will prepare and submit all necessary
documentation to the TCEQ to ensure that all regulatory requirements are met.
EXHIBIT"A"
Page 4 of 9
These documents may include, but are not limited to, the following:
o TCEQ Exception Request and associated documentation
o TCEQ Plan Review and Approval Form and associated documentation
o Continued reporting, as required by the TCEQ
B. Bid Phase - During this phase, the Engineer will assist the City throughout the bidding
process. The services to be provided during this phase may include, but are not limited to,
the following:
• Participate in pre-bid meetings and conferences and provide an agenda that
identifies all critical construction activities and project elements
• Review and respond to all pre-bid questions and submissions that have provided
by prospective contractors
• Prepare any addenda, in necessary,to inform contractors of any approved changes
or revisions that have taken place prior to bidding
• Attend the bid opening, analyze the incoming bids, prepare the bid tabulation, and
provide a recommendation concerning the contract award
C. Construction Phase - During this phase, the Engineer will act as the City's representative
and assist the City throughout the construction of the C102 system. The services to be
provided during this phase may include, but are not limited to,the following:
• Perform negotiations with prospective contractors during bidding and construction
of the project on the City's behalf
• Review all project-specific documentation and submittal information to ensure
compliance with contract documents
• Conduct final inspection of the C102 system at the end of construction to determine
if the project requirements were met.
• Provide record drawings of the CIO2 system in place, along with O&M manuals, to
the City.
D. Start-up and Training Phase- During this phase,the Engineer will provide start-up services
and City staff training to ensure that the newly constructed CI02 system is functional and
can be operated by the ONSWTP staff.The services to be provided during this phase may
include, but are not limited to, the following:
• Review the start-up documentation provided by the manufacturer and/or the
contractor
• Prepare the standard operating procedures (SOPs) that are relevant to the C102
system
• Assist the City in the initial period of operations and commissioning of the C102
system
• Coordinate and conduct training sessions with ONSWTP staff in conjunction with
the CIO2 system manufacturer
EXHIBIT"A"
Page 5 of 9
6. Chlorine Booster System Implementation at Navigation Pump Station (PS)
The purpose of this task is to provide the City with the necessary documentation to install and
operate a new chlorine booster system at the Navigation PS. Navigation PS has been identified
as a critical component of the water distribution system, and preliminary hydraulic modeling has
demonstrated that Navigation PS has a significant influent on the water quality in the distribution
system.The implementation of a new chlorine booster system at the Navigation PS would provide
the following benefits:
• Increase the overall disinfectant residual throughout the distribution system
• Reduce the amount of free available ammonia(FAA)in the distribution system,which could
potentially reduce the number of nitrification events
• Potentially reduce the amount of residual disinfectant requirements at ONSWTP by
supplying additional residual disinfection in the distribution system
This task is proposed to be conducted in five (5)phases:
A. Pilot Phase- During this phase,the Engineer would assist the City in the development and
implementation of the pilot program to determine the required operational conditions and
to analyze the effectiveness of the UGSI Monochlor Tank Shark Chloramine Management
System. This pilot progeam will provide the necessary data to assist the City in choosing
the type of disinfectant residual management system to employ at the Navigation PS. The
services to be provided during this phase include, but are not limited to, the following:
• Provide manufacturer with the necessary technical information and operations data
to develop pilot equipment
• Coordinate with the manufacturer for pilot set-up and operations
• Review and analyze results from pilot operations
• Provide recommendations on the specific equipment and operational conditions for
the full-scale system
• Provide guidance in determining the specific disinfectant system to be installed at
Navigation PS, based on pilot results
B. Design Phase- During this phase,the Engineer would develop the necessary construction
drawings, contract documents, and specifications for the installation of the a new chlorine
booster system at the Navigation PS, including the containment areas, chemical feed
systems, pumps, and associated piping and valves.The following submittals to the City will
be provided during the design phase:
• Pre-Final Submittal: The Engineer will prepare and submit contract documents,
including front-end documents, construction drawings, and preliminary
specifications,which have been developed to a 100%level of completion,for review
and comment by the City.
EXHIBIT"A"
Page 6 of 9
.
• Final Design Submittal: The Engineer will prepare and submit the Final Design
Submittal, which will consist of a final set of signed and sealed construction
drawings and project specifications that have addressed the City's comments from
the Pre-Final Submittal. Along with distributing these final documents to the City
staff, the Engineer will prepare these documents for bidding purposes.
• Permitting Documentation: The Engineer will prepare and submit all necessary
documentation to the TCEQ to ensure that all regulatory requirements are met.
These documents may include, but are not limited to,the following:
• TCEQ Plan Review and Approval Form and associated documentation
• Continued reporting, as required by the TCEQ
C. Bid Phase - During this phase, the Engineer will assist the City throughout the bidding
process. The services to be provided during this phase may include, but are not limited to,
the following:
• Participate in pre-bid meetings and conferences and provide an agenda that
identifies all critical construction activities and project elements
• Review and respond to all pre-bid questions and submissions that have provided
by prospective contractors
• Prepare any addenda,in necessary,to inform contractors of any approved changes
or revisions that have taken place prior to bidding
• Attend the bid opening, analyze the incoming bids, prepare the bid tabulation, and
provide a recommendation concerning the contract award
D. Construction Phase - During this phase, the Engineer will act as the City's representative
and assist the City throughout the construction of the chlorine booster system at the
Navigation PS. The services to be provided during this phase may include, but are not
limited to, the following:
• Perform negotiations with prospective contractors during bidding and construction
of the project on the City's behalf
• Review all project-specific documentation and submittal information to ensure
compliance with contract documents
• Conduct final inspection of the chlorine booster system at the end of construction
to determine if the project requirements were met.
• Provide record drawings of the chlorine booster system in place, along with O&M
manuals, to the City.
E. Start-up and Training Phase-During this phase,the Engineer will provide start-up services
and City staff training to ensure that the new chlorine booster system is functional and can
be operated by the City staff. The services to be provided during this phase may include,
but are not limited to, the following:
EXHIBIT"A"
Page 7 of 9
•
•
• Review the start-up documentation provided by the manufacturer and/or the
contractor
• Prepare the standard operating procedures(SOPs)that are relevant to the chlorine
booster system
• Assist the City in the initial period of operations and commissioning of the chlorine
booster system
• Coordinate and conduct training sessions with City staff in conjunction with the
chlorine booster system manufacturer
SCHEDULE
While the exact schedule for the completion of these tasks will be determined based on the
requests of the City staff, the project is anticipated to be completed based on the following
schedule:
Activity Completion Date
NE Contract Execution-Notice to Proceed(NTP) TBD
3. Water Storage Tank Sampling and Monitoring Program Six(6)weeks after NTP
4. GAC/Nanofiltration Pilot Plant Operations Twelve(12)months after NTP(includes
3-month lead time for Pilot System)
5. Chlorine Dioxide System Implementation at ONSWTP
Five (5)months after NTP
• Final Design, Construction, and Facility Start-up
6. Chlorine Booster System Implementation at Navigation
PS Three(3)months after Monochlor Pilot
Completion
• Final Design, Construction, and Start-up
EXHIBIT"A"
Page 8 of 9
ti , .
FEES
Services will be provided on a Time and Materials (T&M) basis for a total not-to-exceed contract
amount of$453,000, as shown below.
Services Performed by Consultant Original Contract Amd No. 1 TOTAL
1. ONSWTP Process and Operations
Assessment $300,000 -- $300,000
2. Water Distribution System Analysis and
Operations Assessment $200,000 -- $200,000
3. Water Storage Tank Sampling and Monitoring
Program $43,000 $43,000
4. GAC/Nanofiltration Pilot Plant Operations -- $250,000 $250,000
5. Chlorine Dioxide System Implementation at
ONSWTP -- $85,000 $85,000
6. Chlorine Booster System Implementation at
Navigation PS $75,000 $75,000
TOTAL $500,000 $453,000 $953,000
Monthly invoices will be provided by the Engineer based on actual working hours and associated
expenses at agreed upon hourly rates. Expenses may include equipment, supplies, laboratory
expenses, and mileage required to perform the work defined in the contract amendment. Meals
and incidentals are not included as associated expenses; however, for workshops and site visits
required by experts on trips shorter than 5 days, travel, lodging and meal expenses will be covered
on a per diem basis.The City's Project Manager is responsible for assigning tasks to the Engineer
and approving daily/weekly/monthly hours. The Engineer is required to submit a detailed and
approved man-hour breakdown accompanying with monthly invoices to Engineering Services for
payment.
If you have any questions or if you would like to discuss in more detail, please feel free to call me
at(469)250-3781.
Sincerely,
Hazen and Sawyer
TBPE Firm No. F-13618
a + r b , „.
Chamindra Dassanayake, PhD, P.E.
Vice President and Southwest Regional Manager
EXHIBIT"A”
Page 9 of 9