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Home My WebLink AboutC2026-013 - 2/10/2026 - Approved CITY OF CORPUS CHRISTI ENGINEERING SERVICES CHANGE ORDER VENDOR ID NO.: 117424 PROJECT: Oso WRP Process Upgrades and Breakpoint Chlorination Facility Decommissioning CONTRACT NO.: 5467 CONTRACTOR: CSA Construstion Inc. ENGINEER: Ardurra Group,Inc.(dab LNV,Inc.) PROJECT NUMBER: 20084A PROJECT MANAGER: Sandra Gomez CHANGE ORDER NO: 4 OPERATING DEPT.: Water CHANGE ORDER DATE: REV 2/12/26 Make the following additions,modifications or deletions to the work described in the Contract Documents: ADDITIONS Quantity Unit I Init Price Total Additional scope of work PART B-Solids Dewatering Bid. New B1-674- Replace roofing and decking with similar materials I LS $ 1,910 215.40 $ 1910,215.40 New B 1-675 Substitute Tectum IIIP panels in lieu of metal decking 1 LS $ 90,122.59 $ 80,122 59 New B1-676 Add the replacement of the two rear l0xl0 roll up doors 1 LS $ 24240.51 $ 2424051 New B1-677 Add the replacement of the second-floor office operator sink and cabinet 1 LS $ 19,059.05 $ 19,059.05 Subtotal: $ 2,033,637.55 PART B-AERATED SLUDGE HOLDING TANK New B 1-373 Aerated Sludge Holding Tank Modifications 1 LS $ 613.039.24 $ 613,039.24 New B1-374 Remove and replace the ADH tank perimeter handrail with new aluminum handrail 1 LS $ 75,311.65 $ 75,31 1.65 Subtotal: $ 688,350.89 PART4-GENERAL A4 Unantiepated Work Allowance 1 LS $ 800 000.00 $ 800,000.00 Subtotal: $ 800,000.00 Additional Contract Time Due To:Scope of Work 130 DAY $ - $ - Additions Total: $ 3,521,988.44 DELETIONS Quantity Unit Unit Price Total N/A Additional Calendar Days requested 30 NET TOTAL OF THIS CHANGE ORDER: S 3,521,988.44 was this Change necessary: Council Approved:This change order authorizes payment for are building upper deck and roof reconstruction at the dewatering building,the replacement of are coarse bubble aeration system in the aerated sludge holding tank,and an additional allowance for unanticipated construction costs moving forward. This Contract MOdZfication represents Final Ad)ustinent for any and all amounts due or to become due to Contractor fir changes referred to herein.Contractor further release's all other claims,Lf any (except those claims previously submitted in writing in shict accordance with the Contract),for additional compensation under this Conhac4 including without limitation any rights Contractor nuiy have for additional compensation arising out if delays or disruption if Contractor's schedule as may have arisen prior to the date if this Contract Moderation. Unless otherwise expressly provided herein,the time of cornpletion and all other terms and conditions of the Contract remain unchanged Original Contract Amount $ 109,890,200.00 Proposed Change Order Maximum Change Order Contingency Amount(25%) $ 27,472,550.00 Funding Source(s) Remaining Available Contingency Amount(including this CO) $ 23,950,56156 SECTION/FUND FUND: 4261-46-89 PreviouslyApproved Change Order Amount $ ACCOUNT: 550910 Proposed Change Order Amount $ 3,521,988.44 for use by CAP ACTIVITY;120084A426(EXP Revised Contract Amount _ $ 113,412,188.44 for use by CAP AMOUNT;1$3,521 988.44 Percent of Total Change Orders(including this CO) 321 SECTION/FUND Original Contract Time for Substantial Completion 1465 CD's FUND; n/a Notice to Proceed Date 6/1 1/2 024 ACCOUNT: n/a Original Substantial Completion Date 6/15/2028 ACTIVITY; n/a AMOUNT: n/a Previously Approved Change Order Time 154 CD's Additional Time on This Change Order 130 CD's SECTION/FUND Revised Contract Time for Substantial Completion 1749 CD's FUND: n/a Revised Substantial Completion Date 3/26/2029 for use by CAP ACCOUNT: n/a ACTIVITY: n/a CONTRACTOR AMOUNT: n/a REQUESTED BY: CSA Construstion Tnc. SECTION/FUND 02/24/2026 FUND:Ln/aACCOUNT:Rick Mayfield Date ACTIVITY:Pro eectMana er AMOUNT: CITY OF CORPUS CHRISTI ENGINEERING SERVICES CHANGE ORDER VENDOR ID NO.: 117424 PROJECT: Oso WRP Process Upgrades and Breakpoint Chlorination Facility Decommissioning CONTRACT NO.: 5467 CONTRACTOR: CSA Construstion Inc. ENGINEER: Ardurra Group,Inc.(dab LNV,Inc.) PROJECT NUMBER: 20084A PROJECT MANAGER: Sandra Gomez CHANGE ORDER NO: 4 OPERATING DEPT.: Water CHANGE ORDER DATE: REV 2/12/26 Make the following additions,modifications or deletions to the work described in the Contract Documents: CITY OF CORPUS CHRISTI 02/17/2026 fog atria?Wuwuthu 02/26/2026 REVIEWED BY: APPROVED BY:f�Rat a Pott—thu(Feb 26,tots 1629:01 CST) Arnulfo Garcia Date Jeff H.Edmonds,P.E. Date Finance&Resource Manager Director of Engineering Services 70-40ng(J7a'11180),��ng 02/24/2026 RECOMMENDED BY: 9�eogeoggoao�e 7 Deng tFei�za,zoze�o-zosz esr7 Jiangang(Daniel)Deng,Ph.D.,P.E Date Assistant Director of Constitution Inspection 02/24/2026 M2026-011 initials��s� J�a iet Whitehead(Feb 24,2026 1026:58 CST) AUthnrlZed Legistrar No. APPROVED AS TO FORM: Janet Whitehead Date 2/10/2026 Assistant City Attorney By Council Council Date RHSB 02/24/2026 C,O-yeas 02/27/2026 RECOMMENDED BY: Raeza,zozsissoaecsF7 ATTEST: Rodolfu(Rudy)Pena Date (Council) Rebecca Huerta Date Capital Budget Manager (>$100 000.00 or>_25%)City Secretary Jana Rodriguez From: Angelica Garza Sent: Tuesday, February 17, 2026 2:08 PM To: Jana Rodriguez; CFAGroupConstruction Cc: Arnulfo Garcia Jr Subject: RE: (REQUEST FUNDING) 20084A Change Order 4 - OSO WRP Process Upgrades and Breakpoint Chlorination Facility Decommissioning. Attachments: 20084A Change Order 4 draft-2.12.26.pdf Good afternoon, Please see the funding source and the funding table below. Funding Sources Fund-Dept-Org: 4261-46-89 -Account 550910 Project(Activity): 20084A4261 XP Amount: 3,521,988.44 Funding Taf3le Part editions Deletions Net PartA 800,000.00 - 800,000.00 Part B 2,721,988.44 2,721,988.44 TOTAL 3,521,988.44 - 3,521,988.44 PO: No PO provided since there are no deletions. Best regards, A nget;ca'(ja�ird"- Contracts/Funds Administrator 361-826-3997 Angel icag2(a)-corpuschristitx.gov cftY op coneus rHaisri Neuli elp with ENGINEERING � gp"1ic } SERVISERVICES icumMm-1 a rCenk our CES iL au�Ramer call crater. 1 AGENDA MEMORANDUM Action Item for the City Council Meeting of February 10, 2026 DATE: February 10, 2026 TO: Peter Zanoni, City Manager FROM: Jeff H. Edmonds, P. E., Director of Engineering Services 0effreye(cDco rpuschristitx.aov (361) 826-3851 Nicholas J. Winkelmann, P.E., Interim Chief Operating Officer NickWa-corpuschristitx.aov (361) 826-1796 Sergio Villasana Jr., CPA, CGFO, CIA, Director of Finance & Procurement sergiov2acorpuschristitx.gov (361) 826-3227 Construction Chanae Order Oso Water Reclamation Plant Process Upgrade & Breakpoint Chlorination Facility Decommissioning CAPTION: Motion authorizing the approval of Change Order No. 4 with CSA Construction, Inc., of Houston, Texas, for the Oso Water Reclamation Plant (WRP) Process Upgrade & Breakpoint Chlorination (BPC) Facility Decommissioning project located in Council District 4, in an amount of $3,521,988.44 for a total amount not to exceed $113,412,188.44 which includes $2,033,637.55 for the solids dewatering building upper deck and roof reconstruction, $688,350.89 for the aerated sludge holding tank modifications to replace the coarse bubble aeration system, and $800,000.00 for unanticipated underground work allowance, with FY 2026 funding available from the Wastewater Capital Fund. SUMMARY: This change order authorizes payment for the building upper deck and roof reconstruction at the dewatering building, the replacement of the coarse bubble aeration system in the aerated sludge holding tank, and an additional allowance for unanticipated construction costs moving forward. BACKGROUND AND PURPOSE: On March 19, 2024, the City Council awarded a construction contract to CSA Construction, Inc., of Houston, Texas, for the Oso WRP Process Upgrade & BPC Facility Decommissioning project. The project aims to replace the existing BPC facility with a biological ammonia removal treatment process and provide a third treatment basin. Additionally, it involves modifying the two existing basins to increase treatment capacity from 16.2 MGD to 18.0 MGD. The scope further includes rehabilitating or replacing aging infrastructure, such as the blower system, clarification units, disinfection system, solids dewatering and disposal systems, plant electrical and instrumentation, yard piping, and other miscellaneous improvements. The original construction scope included repairing the dewatering building roof via sand-blasting and the application of a protective coating. However, upon inspection, excessive corrosion was discovered on the rafters and roof panels. Preliminary pressure washing of a test area resulted in panel failure, leading to the determination that the roof could not withstand blasting media and was approaching structural failure. As these improvements constitute the reconstruction of 20% or more of the building, this change order authorizes the demolition and replacement of the roof, rafters, and substructure to extend the building's structural life. The work includes replacing man- doors, windows, and skylights; adding new gutters and downspouts; installing an interior access ladder and certified lightning protection system; and replacing the second floor and exterior lighting. The total cost for this work is $2,033,637.55. Additionally, this change order will replace the existing air-bridge coarse bubble aeration system in Aerated Sludge Holding Tank #1 with a new floor-mounted coarse bubble system to improve mixing and minimize solids deposition. This work includes the installation of a bypass system to dewater the tank, allowing for the demolition of the existing air bridge, handrails, and floor supports. The cost for this work is $688,350.89. To mitigate the risk of encountering undocumented or failing infrastructure during excavation, an additional allowance is proposed to cover potential field discoveries, including unforeseen conditions dating back to the 1941 plant foundations underground. City staff proposes adding an $800,000 construction allowance to provide funds for unanticipated underground work. This is necessitated by unknown buried piping and foundation, which was installed 40-80 years ago, and the uncertain condition of structures that have remained in continuous use since 1984. Previous modifications include Change Order 1 (design alterations due to site discrepancies), Change Order 2 (additional offices and workstation remodeling), and Change Order 3(remodeling of existing office space). PROJECT TIMELINE: Change Order No. 4 will add 130 calendar days to the construction contract. The anticipated completion date for the project is now March 2029. ALTERNATIVES: City Council could choose not to approve Change Order No. 4 with CSA Construction, Inc. However, without these improvements, the existing roof remains at risk of collapse. Such a failure would likely damage critical dewatering equipment, resulting in significantly higher repair costs and extensive operational downtime. FISCAL IMPACT: The fiscal impact to Corpus Christi Water in FY 2026 is an amount not to exceed $3,521,988.44, with funding available from the Wastewater Capital Fund. The cost of change order no. 4 will be paid using currently budgeted funds. Due to the fact total project costs, inclusive of the change order, are programmed across a five year horizon, the increased total project cost will be incorporated into future budget cycles, with corresponding budget adjustments reflected in the FY 2027, FY 2028, and FY 2029 budgets. FUNDING DETAIL: Fund: Waste Water 2024 CI (Rv Bds) (Fund 4261) Department: Wastewater(46) Organization: Grants &Capital Projects Funds (89) Project: Oso WRP Process Upgrade& BPC Facility Decommissioning (Project No. 20084A) Account: Construction (550910) Activity: 20084A-4261-EXP Amount: $3,521,988.44 RECOMMENDATION: Staff recommend approval of Change Order No. 4 in the amount of$3,521,988.44 for the Oso WRP Process Upgrade & BPC Facility Decommissioning project with CSA Construction, Inc. LIST OF SUPPORTING DOCUMENTS: Location and Vicinity Map Change Order No. 4 CIP Page Presentation CS )nstruction, Inc. CHANGE ORDER REQUEST lister Road Houston,TX 77092 No. 027 Rev.02 i,� j -d868 MAIN (713)686-8889 FAX PROJECT: Corpus Christi OSO WRP Process Upgrades#20084A DATE: 12/31/2025 TO: Attn: Daniel Deng, Ph.D., P.E. JOB: 2402 City of Corpus Christi 4917 Holly Road, Bid. NO 5 CONTRACT NO: 20084A Corpus Christi, Texas 78411 PAGES INCLUDED: (63) TITLE: Dewatering Bid. Roof Replacement &Aerated Sludge Holding Tank Modifications Reference: RFI #089 DESCRIPTION OF PROPOSAL Dewatering Bid. Base Bid: Replace roofing and decking with similar materials. New B1-674$1,910,215.40 CSA proposes to demolish and replace the dewatering building roof as per the updated plans and specifications issued by Ardurra. This work includes but not limited to replacing existing man doors, building windows, skylights, adding new gutters and down spouts, interior access ladder, roof hatch re-installation, second-floor level and building exterior lighting replacement and the installation of a certified lightning protection system. CSA will provide temporary scaffolding over the existing belt presses to allow them to maintain operations.The office and storage room drywall ceilings will be removed and replaced as well. CSA will maintain access to the belt press master control panel. During this operation, we will keep the belt presses operational however,these rooms will not be available for operator use and will need to have the furnishings removed. CSA has not included any labor to remove these furnishings. Rev.02 This change was due to a conflict between the specifications and plans. The specifications noted the insulation was to be sloped and the plan details showed two layers of flat insulation. We confirmed the insulation is to be flat as per the plans.Atlas removed the sloped insulation from their bid to match the plan details. This resulted in a reduced roofing proposals for both the base bid and alternate#1. Aerated Sludge Holding Tank Modifications New B1-373$613,039.23 CSA proposes to remove the existing aerated sludge holding tank air bridge course bubble aeration system and replace with new floor mounted course bubble aeration as per the plans and specifications issued by Ardurra. This work will include the installation of a temporary bypass system similar to the previously used system when the center wall was removed from same tank. Once the bypass system is in place, CSA will dewater the holding tank then demolish the existing air bridges including handrail and floor supports. We will then install the new floor-mounted aeration system and connect to the existing overhead air header. Included will be sidewalk removal and replacement.The floor mounted air piping is quoted at 316L, which is their standard, so no alternate will be needed. CSA reached out to multiple suppliers and subcontractors to try and get more than one bid for work items such as steel and roofing. These bid totals are shown to the right of the bids we used under the columns labeled "other bids received" on the attached pricing breakdown worksheets. These other bids are also included in the attached bid documents for reference. CS )nstruction, Inc. CHANGE ORDER REQUEST lister Road Houston,TX 77092 No. 027 Rev.02 i,� j -d868 MAIN (713)686-8889 FAX Rev.01 Removed 60 additional days from the Headworks Panel Relocation COR#025 to this COR#027.This will not change the General Conditions added in this COR#027. The price stays the same.The only change is the added days. TOTAL Adder:$2,523,254.63 Rev.02 Reduced Price Rev. 01 TOTAL ADDED DAYS: 70 original+60 from COR#025=130 Alternate#1:Substitute Tectum IIIP panels in lieu of metal decking. New B1-675$80,122.59 This alternate will delete the metal decking and replace it with Tectum IIIP sandwich panels which includes insulation. The TPA roofing membrane will be on top of the tectum panels. TOTAL Adder: $80,122.59 Rev.02 Reduced Price Removing the roof during hurricane season (June 1 through November 1)will render the dewatering building non hurricane rated during the roof replacement work. This change must be approved December 15th so materials can be submitted, approved and delivered and work completed before June 1. Alternate#2:Add the replacement of the two rear 10 x 10 roll up doors. New B1-676$24,240.51 This alternate adds the back two roll up TDI rated doors.These doors are chain hoist operated to match the existing doors. TOTAL Adder:$24,240.51 Alternate#3:Add the replacement of the second-floor office operator sink and cabinet. New B1-677$19,059.05 This alternate adds a new cabinet to replace the existing cabinet which is in bad condition and unrepairable. TOTAL Adder: $19,059.05 Alternate#4: Remove and replace the ASH Tank perimeter handrail with new aluminum handrail. New B1-374 $75,311.66 This alternate will remove the existing perimeter handrail around the aerated sludge holding tank and replace with new aluminum handrail. If this alternate is not taken there will be gaps in the existing handrail once the bridges are removed. TOTAL Adder:$75,311.66 If the dewatering building roof replacement is approved the previously approved COR#012, dewatering building additional ceiling coating,for$17,225 will not be needed. APPROVAL: By: By: Corpus Christi Engineering Dept. 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History Document created by Jana Rodriguez Qanar@corpuschristitx.gov) 2026-02-26-9:01:15 PM GMT Document emailed to Ratna Pottumuthu (ratnap@corpuschristitx.gov) for signature 2026-02-26-9:01:23 PM GMT Email viewed by Ratna Pottumuthu (ratnap@corpuschristitx.gov) 2026-02-26-10:28:34 PM GMT A Signer Ratna Pottumuthu (ratnap@corpuschristitx.gov) entered name at signing as for Ratna Pottumuthu 2026-02-26-10:28:59 PM GMT h Document e-signed by for Ratna Pottumuthu (ratnap@corpuschristitx.gov) Signature Date:2026-02-26-10:29:01 PM GMT-Time Source:server Document emailed to Sarah Brunkenhoefer(sarahb@corpuschristitx.gov) for signature 2026-02-26-10:29:18 PM GMT Email viewed by Sarah Brunkenhoefer(sarahb@corpuschristitx.gov) 2026-02-27-2:29:23 PM GMT CA' Document e-signed by Sarah Brunkenhoefer(sarahb@corpuschristitx.gov) Signature Date:2026-02-27-3:35:00 PM GMT-Time Source:server Document signing automatically delegated to stephanieb2@cctexas.com by Rebecca Huerta (rebeccah@corpuschristitx.gov) 2026-02-27-3:37:07 PM GMT Document emailed to stephanieb2@cctexas.com for signature 2026-02-27-3:37:08 PM GMT Document emailed to Rebecca Huerta (rebeccah@corpuschristitx.gov) for signature 2026-02-27-3:37:09 PM GMT Adobe Acrobat Sign Document e-signed by Rebecca Huerta (rebeccah@corpuschristitx.gov) Signature Date:2026-02-27-3:50:49 PM GMT-Time Source:server Agreement completed. 2026-02-27-3:50:49 PM GMT Adobe Acrobat Sign