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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 - ., 11) /,� LLa�� � �tu� �c� i�QD,4)=. 11 16tu b 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 0.,- r/C t,( 247 I ()) 9//6 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