closed🌐 trwd24-107
CORROSION CONTROL ENGINEERING SERVICES FOR CEDAR CREEK SECTION 2 REPLACEMENT (PHASE 2), CEDAR CREEK SECTION 4 REPLACEMENT, SECTION 1D & 1E PIPELINES AND ARLINGTON OUTLET IMPROVEMENTS
trwd / Purchasing
Description
TRWD is hereby inviting qualified consultants to submit Statements of Qualifications (SOQs) for C orrosion Control Engineering Design Services for Phase 2 of the Cedar Creek Section 2 replacement, Cedar Creek Section 4 replacement, and the Section 1D & 1E pipelines and AO Improvements projects . The pipelines and facilities are described in general terms below with a few items highlighted in which TRWD expects to see qualifying experience. Include other relevant information to be considered when reviewing the proposed Team’s experience. Refer to Section 4 for the schedule, and Section 6 for the proposed scope of work. It is recommended that the prospective firm has the ability and resources to offer the level of services required. This experience includes, but is not limited to: Cathodic Protection Design for Large Diameter Pipelines (72-inch diameter and greater) Project Management Construction Cost Estimating Scheduling Geographic Information Systems Document Control / Information Management Construction Management and Inspection of Cathodic Protection Installations Continuity Testing In-Place Isolation Testing Baseline Surveys Stray Current Interference Detection and Mitigation Geotechnical Engineering to be performed by others as part of the pipeline design contracts, but will work in close coordination with consultant Large Diameter Pipeline Design (72-inch diameter and greater) to be contracted separately by TRWD, will work in close coordination with consultant. In the Statement of Qualifications, the consultant team will need to demonstrate: 1. Established project management experience from previous large diameter pipeline and valve projects with cathodic protection installations. 2. Experience and expertise for large diameter raw water transmission pipeline cathodic protection analysis and design. 3. Working knowledge and familiarity of TRWD’s cathodic protection technical specifications, and details (used on recent IPL pipeline sections) that will be utilized on this project. 4. Established GIS experience and technical capabilities for collaborating with TRWD staff. 5. Experience and expertise with construction management of large diameter raw water transmission pipeline cathodic protection installations. TRWD recommends prospective consultants consider teaming with sub consultants to meet or exceed Diverse Business goals and to bring the required expertise to this project. Do not provide any fee estimates, pricing, or billing rate information in the SOQ. The consultant selected for this project will be expected to submit an initial scope and fee estimate along with appropriate backup information. The scope and fee are expected to be submitted within the schedule shown in Section 4. DESCRIPTION OF THE CEDAR CREEK PIPELINE: The Cedar Creek (CC) 72” pre-stressed concrete cylinder pipeline (PCCP) is TRWD’s oldest raw water transmission main, dating back to the early 1970s. TRWD maintains a robust condition assessment and risk-based prioritization program for identifying and replacing approximately 15 to 20 segments of distressed PCCP pipe each year. TRWD’s commitment to properly operating a galvanic cathodic protection system on its PCCP pipelines, along with pressure transient reduction measures in place since the mid 1990’s, have greatly extended the remaining useful life of the CC pipeline. However, despite this effective pipeline integrity program, multiple areas of the CC pipeline continue to be at risk of failure, requiring a more substantial renewal program. Initial installation of the cathodic protection system for TRWD’s East Texas PCCP pipelines was accomplished over a 5-year period in the mid-1990s using a galvanic system. Zinc anodes were attached to the PCCP pipelines developing a target instant-off (polarized) potential range between -0.720v to -0.820v. Care must be taken to not excessively polarize the pipeline as hydrogen embrittlement of the pre-stressing wire can result leading to increased wirebreaks. For polyurethane coated, welded steel pipe, the preferred polarization range is -0.85v to -1.5v, beyond that damage to the coatings can be expected. Magnesium anodes on the IPL pipeline and impressed current on the Eagle Mountain pipeline are employed. Therefore, periodic checking and adjustment of the cathodic protection system to achieve the desired target range is of great importance to help extend the life of TRWD’s pipelines. The pipeline from Cedar Creek reservoir is approximately 74 miles of primarily 72-inch diameter pre-stressed concrete cylinder pipe with a maximum carrying capacity of approximately 127 MGD. The pipeline begins at Cedar Creek, southeast of Dallas, and ends at Rolling Hills Booster Pump Station in southeast Fort Worth. Until 1986, this pipeline was the only raw water service line from East Texas to Tarrant County. TRWD has organized the pipeline into sections to simplify areas of responsibility for operation and maintenance. The labels of the CC sections are in order of geographic location beginning with the closest to Fort Worth as Section 1 and ending with the section closest to the Cedar Creek Lake pump station as Section 4. The following exhibit presents the limits of the proposed projects in Section 2 and Section 4 of the Cedar Creek Pipeline. a. PROJECT BACKGROUND FOR THE CEDAR CREEK SECTION 2, MOUSER WAY TO KBR (PHASE 2) PIPELINE REPLACEMENT Section 2 of the CC pipeline conveys water from the Waxahachie Pump Station to the Kennedale Balancing Reservoir (KBR). It can also convey the Integrated Pipeline (IPL) water through the S2x12 Interconnect. In 2019, preliminary design of Phase 1 began to remove and replace approximately ten miles of 72” PCCP with 90” welded steel pipe in the Mansfield to Midlothian area which will provide additional water delivery capacity and replace areas evaluated by the pipeline risk model with high likelihood and consequence of failure. In 2022, it was recommended to upsize the stretch from Mouser Way to S2x12 with 102” instead of the original 90” design to provide additional water delivery capacity from the IPL, with the remainder of the pipeline planned to be upgraded in the future all the way from Mouser Way to KBR. The corrosion control engineering design of Phase 1 includes the installation of a galvanic system with zinc anodes on the new coated steel pipe. Zinc was chosen instead of magnesium due to zinc’s lower driving potential. If the potential is raised too high it could influence the potential on the adjacent PCCP and possibly cause unintended hydrogen embrittlement wire break damage. The design also consists of monolithic isolation joints that will be installed between the new steel pipe and the existing PCCP that will remain in place. During construction the adjacent Richland Chambers pipe with an existing galvanic system that was installed in the mid 90s will be disturbed. As part of the Phase 1 design the Richland Chambers pipeline will get a new galvanic system with zinc anodes installed since they have reached their end of useful life and will be partially impacted during construction. The construction of Phase 1 is planned to start in late 2024 following completion of the modifications to the KBR existing cells and is planned to be fully constructed by 2027. The Phase 1 project is focused on replacing Cedar Creek pipe that has high likelihood and consequence of failure while also increasing flow capacity and extends continuously from just west of Hwy 67 in Midlothian, past the S2x12 Interconnect facility with IPL, to Mouser Way in Mansfield. Phase 1 also replaces a high-risk area of Cedar Creek pipe east of Midlothian near FM 664. Keeping future water delivery capacity in mind, Phase 2 would connect to the Phase 1 project at Mouser Way and provide a continuous stretch of 102” pipe from S2x12 to KBR. The upsize to 102” was evaluated by the Water Resources’ team and the estimated additional capacity for various operating scenarios will be between 15 to 30 MGD over the originally planned 90” pipe. In addition to the added water delivery capacity benefit, the 4.42 miles from KBR to Mouser Way would replace a few areas with high likelihood and consequence of failure. This section of pipeline has 125 out of 984 pipes with defects (13%) and 15 of those pipes are a repair priority 1 which means the pipe has the potential for failure based on risk analysis. This entire section of pipeline was installed in 1971 and is also approaching its end of useful life. Moreover, this stretch of PCCP is a known area with no shorting straps, resulting in reduced ability to protect the pipelines from corrosion if there are multiple breaks in the same pipeline. If a catastrophic failure should occur the surrounding community would be negatively impacted, so executing this project will remove additional hazards and improve community safety. Moreover, loss of this section of the CC Pipeline due to a pipe failure would negatively impact TRWD’s ability to deliver water to several primary customer cities fed directly from the pipeline. This project will require corrosion control engineering services for the replacement of approximately 4.42 miles of 72” pre-stressed concrete cylinder pipe with 102” mortar-lined welded steel pipe from ROW station 319+74 near KBR to 552+89 which will connect to the Phase 1 project at Mouser Way and provide a continuous stretch of 102” pipe from S2x12 to KBR. This project will also include the corrosion control engineering design for the adjacent Richland Chambers pipeline that currently has a galvanic system installed and has reached its end of useful life. The area around this section of Section 2 CC pipeline is rapidly urbanizing. TRWD’s ROW in Section 2 is typically 130 feet wide, with the CC pipeline centerline being approximately 40 feet offset from the northern edge of the ROW and 35 feet from the centerline of the parallel Richland Chambers (RC) 90” PCCP. The existing parallel RC pipeline is to be protected during construction operations at all times. Construction of CC Section 2 Phase 2 work for the 4.42 miles of pipe replacement is expected to be one continuous construction contact. Construction is expected to begin in late 2026 (FY 2027). The following exhibit presents the limits of this proposed project in Section 2 of the Cedar Creek Pipeline. CEDAR CREEK SECTION 2 PHASE 2 PIPELINE REPLACEMENT PROJECT LOCATION, MOUSER WAY TO KBR b. PROJECT BACKFROUND FOR THE CEDAR CREEK SECTION 4 PIPELINE REPLACEMENT: Section 4 of the CC pipeline conveys all water from the Cedar Creek reservoir to the Ennis Booster Pump Station. This pipeline is one of two conveyance methods from the Cedar Creek Reservoir since the IPL JCC1 lake pump station came online. The CC pipeline is located within a 100’ wide ROW in the Trinity Bottoms area. The existing Section 4 pipe is 72-inch C301 PCCP pipe with operating pressures up to 225 psi in the Trinity River Bottoms area near the CC1 Lake PS. This section of pipeline was installed in 1971, with a galvanic cathodic protection system employing zinc anodes installed in the late 1990s. The pipes in this region have historically encountered joint end failures not able to be detected by electromagnetic condition assessment technologies in this flood prone area. These causes have frequently been due to delamination due to poor contractor handling/receipt of delivered pipe, increased likelihood of high-pressure class pre-stressed concrete cylinder pipe being more susceptible to delamination of the exterior concrete coating as the separation distance between pre-stressing wires is reduced, and/or exposure to multiple pressure transient events. Following delamination of the coating, metal loss of pre-stressing wire due to corrosion was occurring unabated until TRWD implemented galvanic cathodic protection in this area in the mid 1990’s. If a pipe break occurs in this area during a major flood event, it could result in an extended CC pipeline operations shutdown spanning several months until flood waters recede, only after which time repairs could be made and the pipeline cleared of mud and debris making this a critical area for rehabilitation. This section of pipeline has 50 out of 1901 pipes with known defects (2.63%) and 18 of those pipes are a repair priority 1 which means the pipe has the potential for failure based on risk analysis. With this 1970s vintage pipe approaching its end of useful life, the low probability of detection, high likelihood of failure, and the limited accessibility in the Trinity River Bottoms especially during extended, frequent flooding events make this section a high-risk portion of the pipeline. This project will require corrosion control engineering services for the new 8.6 miles of planned 90” mortar-lined, polyurethane coated welded steel pipe from ROW station 3458+08 just upstream of the Trinity River to ROW station 3911+61 just downstream of the CC Lake Pump Station. Construction of CC Section 4 work for the 8.6 miles of pipe replacement is expected to be one continuous construction contact. Construction is expected to begin in 2027. The following exhibit presents the limits of this proposed project in Section 4 of the Cedar Creek Pipeline. CEDAR CREEK SECTION 4 PIPELINE REPLACEMENT PROJECT LOCATION c. PROJECT BACKGROUND FOR SECTION 1D & 1E PIPELINE AND AO IMPROVEMENTS: The Section 1D and 1E Pipeline and Arlington Outlet Valve Improvements Project includes three distinct, but interrelated subprojects that are intended to enhance the capacity, reliability, and redundancy of TRWD’s western system. All three subprojects are geographically located between the Lake Arlington Outlet (AO) and the Rolling Hills Booster Pump Station (RH2). Currently, TRWD services the City of Fort Worth’s Rolling Hills Water Treatment Plant (RHWTP) in this area via two existing direct connections. One connection from the northeast allows water to gravity flow from the Kennedale Balancing reservoir along existing pipelines to the RHWTP. The other RHWTP connection from the south utilizes water from East Texas via the Kennedale Balancing Reservoir and/or water from Lake Benbrook to the west that when needed under certain operating scenarios, can be boosted by RH2 to an equalization tank operated by TRWD. In contrast to the CC pipeline rehabilitation projects described previously, this project will include both rehab and new construction activities that may occur concurrently or phased depending on TRWD’s system needs during final design and construction. Each subproject is described below in further detail that will require corrosion control engineering services. Section 1D is a newly proposed 108” pipeline section that will connect to the existing 108” Line J pipeline and parallel the existing 108” RC and 84” CC pipelines northwest from the Arlington Outlet to the interconnect with the 90” Benbrook pipeline within the RHWTP. The total length of the pipeline will be approximately 3 miles and will be constructed in previously acquired TRWD ROW. The TRWD right-of-way located in Section 1 where the CC and RC pipeline will parallel the newly constructed 1D is 130’ wide. Section 1D will include connections to existing lines, as well as crossover and mainline valves near the B506 tee. Operational improvements associated with this subproject include increased capacity to gravity flow water from KBR to the RHWTP and RH2, relieving pressure class constraints of existing pipelines, and providing additional operational flexibility to move water during alternative operating scenarios often required by routine pipeline maintenance. Section 1E is a newly proposed 108” pipeline section that will connect to the proposed Section 1D pipeline at the B506 Tee and parallel the existing 90” Benbrook pipeline southwest and then northwest to the RH2 suction header. The total length of the pipeline will be approximately 3,000 feet in existing TRWD right of way located within the RHWTP site up to and extending into TRWD’s RH2 pump station facility. Section 1E will include connections to existing pipelines as well as valve improvements at RH2. Operational improvements associated with this subproject along with the Section 1d project include increased capacity to gravity flow or boost water from KBR to RH2, relieve pressure class constraints of existing pipelines, operational flexibility to move water west from MBR to BB2 or east from BB1 to TRWD’s Booster Pump Station in Waxahachie (in both cases bypassing KBR). The TRWD right-of-way located in Section 6 where the Benbrook pipeline will parallel the newly constructed 1E is 80’ wide. The corrosion control design team will recommend where to place monolithic isolation joints on Section 1D and 1E where the coated steel pipe and the existing PCCP connect. Improvements at TRWD’s AO are needed to replace aged valves that suffer from routine maintenance challenges (e.g. excess leakage and gearbox malfunctions) and are near the end of their useful life. Specifically, the subproject will include replacing or repairing up to five butterfly valves and associated supply piping to the AO discharge header and the Arlington Hydropower facility that will require corrosion control engineering services. R411 and C413 are 48” crossover valves on the supply lines from the existing 108” RC and 84” CC pipelines. X415 is a 48” crossover valve between the RC and CC supply lines and the Line J supply line. R410 is a 96” mainline valve and C412 is 84” mainline valve on the existing RC and CC pipelines, respectively. X415 is located within the AO facility fence line. The remaining valves are located immediately adjacent to the fence line in previously acquired TRWD ROW. Along with the valving improvements, RC and CC pipe segments with larger diameter outlets are expected to be included in this first phase of AO project. A galvanic system with zinc anodes was installed on Line J with insulating flange kits at crossover connections near AO and KBR, however since this project the TRWD standard has been to go with monolithic isolation joints. The corrosion control design team, in coordination with TRWD, will assess isolation and cathodic protection in this facility as part of the project. Operational improvements associated with this project include restoring the identified valves to a new useful service life, eliminating common maintenance issues, and upsizing supply lines to relieve velocity constraints. This project will also include the corrosion control engineering design for the replacement of the adjacent Richland Chambers and Benbrook pipelines galvanic systems that are currently installed and have reached their end of useful life. SECTION 1E AND 1D PIPELINE AND ARLINGTON OUTLET IMPROVEMENTS PROJECT LOCATION
Details?
- Posted
- Mar 15, 2024
- Response deadline
- Apr 22, 2024, 7:00 PM UTC
- Status
- closed
- Buyer
- trwd
- Department
- Purchasing
- Jurisdiction
- trwd
- Reference #
- 24-107
- Summary
- <p>TRWD is hereby inviting qualified consultants to submit Statements of Qualifications (SOQs) for <span style="background-color: rgb(251, 238, 184);">C</span><span style="color: rgb(0, 0, 0); backgro
- Is Paused
- false
- Template Title
- Request for Statement of Qualifications
- Copy Count
- 0
- Government Organization City
- Fort Worth
- Government Organization Logo
- https://assets.procurement.opengov.com/logo-uploads/578519db-a2a6-4437-ad42-6b7129c9e892_TRWD-Logo.png
- Government Organization Name
- Tarrant Regional Water District
- Government Organization State
- TX
- Government Organization Website
- https://www.trwd.com/vendors/
- Government Organization Zip Code
- 76102
- Government Organization Address1
- 800 E Northside Dr
- Government Organization Timezone
- America/Chicago
- Government Organization Country Code
- US
- Government Organization Phone Country
- 1
- Closed Substatus
- awarded
Contact
(817)335-2491
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Raw record
{
"id": 84852,
"_slug": "trwd",
"title": "CORROSION CONTROL ENGINEERING SERVICES FOR CEDAR CREEK SECTION 2 REPLACEMENT (PHASE 2), CEDAR CREEK SECTION 4 REPLACEMENT, SECTION 1D & 1E PIPELINES AND ARLINGTON OUTLET IMPROVEMENTS",
"status": "closed",
"summary": "<p>TRWD is hereby inviting qualified consultants to submit Statements of Qualifications (SOQs) for <span style=\"background-color: rgb(251, 238, 184);\">C</span><span style=\"color: rgb(0, 0, 0); background-color: rgb(251, 238, 184);\">orrosion Control Engineering Design Services </span>for Phase 2 of the <strong>Cedar Creek Section 2 replacement, Cedar Creek Section 4 replacement, and the Section 1D & 1E pipelines and AO Improvements projects</strong>. The pipelines and facilities are described in general terms below with a few items highlighted in which TRWD expects to see qualifying experience. Include other relevant information to be considered when reviewing the proposed Team’s experience. Refer to Section 4 for the schedule, and Section 6 for the proposed scope of work.</p><p>It is recommended that the prospective firm has the ability and resources to offer the level of services required. This experience includes, but is not limited to: </p><ol style=\"list-style-type: lower-alpha; margin-bottom: 0in; margin-top: 0px;\"><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Cathodic Protection Design for Large Diameter Pipelines (72-inch diameter and greater)</span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Project Management </span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Construction Cost Estimating </span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Scheduling </span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Geographic Information Systems </span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Document Control / Information Management </span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Construction Management and Inspection of Cathodic Protection Installations</span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Continuity Testing</span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">In-Place Isolation Testing</span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Baseline Surveys</span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Stray Current Interference Detection and Mitigation</span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 0in 0px; font-size: 14px;\"><span style=\"font-size: 14px;\">Geotechnical Engineering to be performed by others as part of the pipeline design contracts, but will work in close coordination with consultant </span></li><li style=\"text-align: justify; line-height: normal; margin: 0in 0in 6pt 0px; font-size: 10.5pt;\"><span style=\"font-size: 14px;\">Large Diameter Pipeline Design (72-inch diameter and greater) to be contracted separately by TRWD, will work in close coordination with consultant. </span></li></ol><p><span style=\"font-size: 14px;\">In the Statement of Qualifications, the consultant team will need to demonstrate:</span></p><p><span style=\"font-size: 14px;\"> 1. Established project management experience from previous large diameter pipeline and valve projects with cathodic protection installations. </span></p><p><span style=\"font-size: 14px;\"> 2. Experience and expertise for large diameter raw water transmission pipeline cathodic protection analysis and design. </span></p><p><span style=\"font-size: 14px;\"> 3. Working knowledge and familiarity of TRWD’s cathodic protection technical specifications, and details (used on recent IPL pipeline sections) that will be utilized on this project. </span></p><p><span style=\"font-size: 14px;\"> 4. Established GIS experience and technical capabilities for collaborating with TRWD staff. </span></p><p><span style=\"font-size: 14px;\"> 5. Experience and expertise with construction management of large diameter raw water transmission pipeline cathodic protection installations.</span></p><p><span style=\"font-size: 14px;\">TRWD recommends prospective consultants consider teaming with sub consultants to meet or exceed Diverse Business goals and to bring the required expertise to this project. </span></p><p><span style=\"font-size: 14px;\">Do not provide any fee estimates, pricing, or billing rate information in the SOQ. The consultant selected for this project will be expected to submit an initial scope and fee estimate along with appropriate backup information. The scope and fee are expected to be submitted within the schedule shown in Section 4.</span></p><p><span style=\"font-size: 14px;\"><u>DESCRIPTION OF THE CEDAR CREEK PIPELINE:</u></span></p><p><span style=\"font-size: 14px;\">The Cedar Creek (CC) 72” pre-stressed concrete cylinder pipeline (PCCP) is TRWD’s oldest raw water transmission main, dating back to the early 1970s. TRWD maintains a robust condition assessment and risk-based prioritization program for identifying and replacing approximately 15 to 20 segments of distressed PCCP pipe each year. TRWD’s commitment to properly operating a galvanic cathodic protection system on its PCCP pipelines, along with pressure transient reduction measures in place since the mid 1990’s, have greatly extended the remaining useful life of the CC pipeline. However, despite this effective pipeline integrity program, multiple areas of the CC pipeline continue to be at risk of failure, requiring a more substantial renewal program. </span></p><p><span style=\"font-size: 14px;\">Initial installation of the cathodic protection system for TRWD’s East Texas PCCP pipelines was accomplished over a 5-year period in the mid-1990s using a galvanic system. Zinc anodes were attached to the PCCP pipelines developing a target instant-off (polarized) potential range between -0.720v to -0.820v. Care must be taken to not excessively polarize the pipeline as hydrogen embrittlement of the pre-stressing wire can result leading to increased wirebreaks. For polyurethane coated, welded steel pipe, the preferred polarization range is -0.85v to -1.5v, beyond that damage to the coatings can be expected. Magnesium anodes on the IPL pipeline and impressed current on the Eagle Mountain pipeline are employed. Therefore, periodic checking and adjustment of the cathodic protection system to achieve the desired target range is of great importance to help extend the life of TRWD’s pipelines. </span></p><p><span style=\"font-size: 14px;\">The pipeline from Cedar Creek reservoir is approximately 74 miles of primarily 72-inch diameter pre-stressed concrete cylinder pipe with a maximum carrying capacity of approximately 127 MGD. The pipeline begins at Cedar Creek, southeast of Dallas, and ends at Rolling Hills Booster Pump Station in southeast Fort Worth. Until 1986, this pipeline was the only raw water service line from East Texas to Tarrant County.</span></p><p><span style=\"font-size: 14px;\">TRWD has organized the pipeline into sections to simplify areas of responsibility for operation and maintenance. The labels of the CC sections are in order of geographic location beginning with the closest to Fort Worth as Section 1 and ending with the section closest to the Cedar Creek Lake pump station as Section 4.</span></p><p><span style=\"font-size: 14px;\">The following exhibit presents the limits of the proposed projects in Section 2 and Section 4 of the Cedar Creek Pipeline.</span></p><p><span style=\"font-size: 14px;\"><img src=\"https://govlist.s3.us-west-1.amazonaws.com/images/production/6cd1272b-a9e4-46d2-a0b0-375253040747\"></span></p><p><span style=\"font-size: 14px;\">a. <span style=\"text-decoration: underline;\">PROJECT BACKGROUND FOR THE CEDAR CREEK SECTION 2, MOUSER WAY TO KBR (PHASE 2) PIPELINE REPLACEMENT</span></span></p><p><span style=\"font-size: 14px;\">Section 2 of the CC pipeline conveys water from the Waxahachie Pump Station to the Kennedale Balancing Reservoir (KBR). It can also convey the Integrated Pipeline (IPL) water through the S2x12 Interconnect. In 2019, preliminary design of Phase 1 began to remove and replace approximately ten miles of 72” PCCP with 90” welded steel pipe in the Mansfield to Midlothian area which will provide additional water delivery capacity and replace areas evaluated by the pipeline risk model with high likelihood and consequence of failure. In 2022, it was recommended to upsize the stretch from Mouser Way to S2x12 with 102” instead of the original 90” design to provide additional water delivery capacity from the IPL, with the remainder of the pipeline planned to be upgraded in the future all the way from Mouser Way to KBR. The corrosion control engineering design of Phase 1 includes the installation of a galvanic system with zinc anodes on the new coated steel pipe. Zinc was chosen instead of magnesium due to zinc’s lower driving potential. If the potential is raised too high it could influence the potential on the adjacent PCCP and possibly cause unintended hydrogen embrittlement wire break damage. The design also consists of monolithic isolation joints that will be installed between the new steel pipe and the existing PCCP that will remain in place. During construction the adjacent Richland Chambers pipe with an existing galvanic system that was installed in the mid 90s will be disturbed. As part of the Phase 1 design the Richland Chambers pipeline will get a new galvanic system with zinc anodes installed since they have reached their end of useful life and will be partially impacted during construction. The construction of Phase 1 is planned to start in late 2024 following completion of the modifications to the KBR existing cells and is planned to be fully constructed by 2027.</span></p><p><span style=\"font-size: 14px;\">The Phase 1 project is focused on replacing Cedar Creek pipe that has high likelihood and consequence of failure while also increasing flow capacity and extends continuously from just west of Hwy 67 in Midlothian, past the S2x12 Interconnect facility with IPL, to Mouser Way in Mansfield. Phase 1 also replaces a high-risk area of Cedar Creek pipe east of Midlothian near FM 664. </span></p><p><span style=\"font-size: 14px;\">Keeping future water delivery capacity in mind, Phase 2 would connect to the Phase 1 project at Mouser Way and provide a continuous stretch of 102” pipe from S2x12 to KBR. The upsize to 102” was evaluated by the Water Resources’ team and the estimated additional capacity for various operating scenarios will be between 15 to 30 MGD over the originally planned 90” pipe.</span></p><p><span style=\"font-size: 14px;\">In addition to the added water delivery capacity benefit, the 4.42 miles from KBR to Mouser Way would replace a few areas with high likelihood and consequence of failure. This section of pipeline has 125 out of 984 pipes with defects (13%) and 15 of those pipes are a repair priority 1 which means the pipe has the potential for failure based on risk analysis. This entire section of pipeline was installed in 1971 and is also approaching its end of useful life. Moreover, this stretch of PCCP is a known area with no shorting straps, resulting in reduced ability to protect the pipelines from corrosion if there are multiple breaks in the same pipeline. If a catastrophic failure should occur the surrounding community would be negatively impacted, so executing this project will remove additional hazards and improve community safety. Moreover, loss of this section of the CC Pipeline due to a pipe failure would negatively impact TRWD’s ability to deliver water to several primary customer cities fed directly from the pipeline.</span></p><p><span style=\"font-size: 14px;\">This project will require corrosion control engineering services for the replacement of approximately 4.42 miles of 72” pre-stressed concrete cylinder pipe with 102” mortar-lined welded steel pipe from ROW station 319+74 near KBR to 552+89 which will connect to the Phase 1 project at Mouser Way and provide a continuous stretch of 102” pipe from S2x12 to KBR. This project will also include the corrosion control engineering design for the adjacent Richland Chambers pipeline that currently has a galvanic system installed and has reached its end of useful life. </span></p><p><span style=\"font-size: 14px;\">The area around this section of Section 2 CC pipeline is rapidly urbanizing. TRWD’s ROW in Section 2 is typically 130 feet wide, with the CC pipeline centerline being approximately 40 feet offset from the northern edge of the ROW and 35 feet from the centerline of the parallel Richland Chambers (RC) 90” PCCP. The existing parallel RC pipeline is to be protected during construction operations at all times.</span></p><p><span style=\"font-size: 14px;\">Construction of CC Section 2 Phase 2 work for the 4.42 miles of pipe replacement is expected to be one continuous construction contact. Construction is expected to begin in late 2026 (FY 2027).</span></p><p><span style=\"font-size: 14px;\">The following exhibit presents the limits of this proposed project in Section 2 of the Cedar Creek Pipeline.</span></p><p><span style=\"font-size: 14px;\"><img src=\"https://govlist.s3.us-west-1.amazonaws.com/images/production/05739a7c-7def-47d3-8e31-561930b2ae90\"></span></p><p style=\"text-align: center;\"><span style=\"font-size: 14px;\">CEDAR CREEK SECTION 2 PHASE 2 PIPELINE REPLACEMENT PROJECT LOCATION, MOUSER WAY TO KBR </span></p><p style=\"line-height: normal; margin: 0in 0in 6pt; font-size: 10.5pt; text-align: left;\"><span style=\"font-size: 14px;\">b. <span style=\"text-decoration: underline;\">PROJECT BACKFROUND FOR THE CEDAR CREEK SECTION 4 PIPELINE REPLACEMENT:</span></span></p><p>Section 4 of the CC pipeline conveys all water from the Cedar Creek reservoir to the Ennis Booster Pump Station. This pipeline is one of two conveyance methods from the Cedar Creek Reservoir since the IPL JCC1 lake pump station came online. The CC pipeline is located within a 100’ wide ROW in the Trinity Bottoms area. The existing Section 4 pipe is 72-inch C301 PCCP pipe with operating pressures up to 225 psi in the Trinity River Bottoms area near the CC1 Lake PS. This section of pipeline was installed in 1971, with a galvanic cathodic protection system employing zinc anodes installed in the late 1990s. The pipes in this region have historically encountered joint end failures not able to be detected by electromagnetic condition assessment technologies in this flood prone area. These causes have frequently been due to delamination due to poor contractor handling/receipt of delivered pipe, increased likelihood of high-pressure class pre-stressed concrete cylinder pipe being more susceptible to delamination of the exterior concrete coating as the separation distance between pre-stressing wires is reduced, and/or exposure to multiple pressure transient events. Following delamination of the coating, metal loss of pre-stressing wire due to corrosion was occurring unabated until TRWD implemented galvanic cathodic protection in this area in the mid 1990’s. If a pipe break occurs in this area during a major flood event, it could result in an extended CC pipeline operations shutdown spanning several months until flood waters recede, only after which time repairs could be made and the pipeline cleared of mud and debris making this a critical area for rehabilitation. This section of pipeline has 50 out of 1901 pipes with known defects (2.63%) and 18 of those pipes are a repair priority 1 which means the pipe has the potential for failure based on risk analysis. With this 1970s vintage pipe approaching its end of useful life, the low probability of detection, high likelihood of failure, and the limited accessibility in the Trinity River Bottoms especially during extended, frequent flooding events make this section a high-risk portion of the pipeline.</p><p>This project will require corrosion control engineering services for the new 8.6 miles of planned 90” mortar-lined, polyurethane coated welded steel pipe from ROW station 3458+08 just upstream of the Trinity River to ROW station 3911+61 just downstream of the CC Lake Pump Station. Construction of CC Section 4 work for the 8.6 miles of pipe replacement is expected to be one continuous construction contact. Construction is expected to begin in 2027.</p><p>The following exhibit presents the limits of this proposed project in Section 4 of the Cedar Creek Pipeline.</p><p><img src=\"https://govlist.s3.us-west-1.amazonaws.com/images/production/06fb4f38-04a5-4a77-a8d6-d2b30a122326\"></p><p style=\"text-align: center;\"><span style=\"font-size: 14px;\">CEDAR CREEK SECTION 4 PIPELINE REPLACEMENT PROJECT LOCATION</span></p><p style=\"line-height: normal; margin: 0in 0in 6pt; font-size: 10.5pt; text-align: left;\"><span style=\"font-size: 14px;\">c. <span style=\"text-decoration: underline;\">PROJECT BACKGROUND FOR SECTION 1D & 1E PIPELINE AND AO IMPROVEMENTS:</span></span></p><p>The Section 1D and 1E Pipeline and Arlington Outlet Valve Improvements Project includes three distinct, but interrelated subprojects that are intended to enhance the capacity, reliability, and redundancy of TRWD’s western system. All three subprojects are geographically located between the Lake Arlington Outlet (AO) and the Rolling Hills Booster Pump Station (RH2). Currently, TRWD services the City of Fort Worth’s Rolling Hills Water Treatment Plant (RHWTP) in this area via two existing direct connections. One connection from the northeast allows water to gravity flow from the Kennedale Balancing reservoir along existing pipelines to the RHWTP. The other RHWTP connection from the south utilizes water from East Texas via the Kennedale Balancing Reservoir and/or water from Lake Benbrook to the west that when needed under certain operating scenarios, can be boosted by RH2 to an equalization tank operated by TRWD. In contrast to the CC pipeline rehabilitation projects described previously, this project will include both rehab and new construction activities that may occur concurrently or phased depending on TRWD’s system needs during final design and construction. Each subproject is described below in further detail that will require corrosion control engineering services.</p><p>Section 1D is a newly proposed 108” pipeline section that will connect to the existing 108” Line J pipeline and parallel the existing 108” RC and 84” CC pipelines northwest from the Arlington Outlet to the interconnect with the 90” Benbrook pipeline within the RHWTP. The total length of the pipeline will be approximately 3 miles and will be constructed in previously acquired TRWD ROW. The TRWD right-of-way located in Section 1 where the CC and RC pipeline will parallel the newly constructed 1D is 130’ wide. Section 1D will include connections to existing lines, as well as crossover and mainline valves near the B506 tee. Operational improvements associated with this subproject include increased capacity to gravity flow water from KBR to the RHWTP and RH2, relieving pressure class constraints of existing pipelines, and providing additional operational flexibility to move water during alternative operating scenarios often required by routine pipeline maintenance. </p><p>Section 1E is a newly proposed 108” pipeline section that will connect to the proposed Section 1D pipeline at the B506 Tee and parallel the existing 90” Benbrook pipeline southwest and then northwest to the RH2 suction header. The total length of the pipeline will be approximately 3,000 feet in existing TRWD right of way located within the RHWTP site up to and extending into TRWD’s RH2 pump station facility. Section 1E will include connections to existing pipelines as well as valve improvements at RH2. Operational improvements associated with this subproject along with the Section 1d project include increased capacity to gravity flow or boost water from KBR to RH2, relieve pressure class constraints of existing pipelines, operational flexibility to move water west from MBR to BB2 or east from BB1 to TRWD’s Booster Pump Station in Waxahachie (in both cases bypassing KBR). The TRWD right-of-way located in Section 6 where the Benbrook pipeline will parallel the newly constructed 1E is 80’ wide. The corrosion control design team will recommend where to place monolithic isolation joints on Section 1D and 1E where the coated steel pipe and the existing PCCP connect.</p><p>Improvements at TRWD’s AO are needed to replace aged valves that suffer from routine maintenance challenges (e.g. excess leakage and gearbox malfunctions) and are near the end of their useful life. Specifically, the subproject will include replacing or repairing up to five butterfly valves and associated supply piping to the AO discharge header and the Arlington Hydropower facility that will require corrosion control engineering services. R411 and C413 are 48” crossover valves on the supply lines from the existing 108” RC and 84” CC pipelines. X415 is a 48” crossover valve between the RC and CC supply lines and the Line J supply line. R410 is a 96” mainline valve and C412 is 84” mainline valve on the existing RC and CC pipelines, respectively. X415 is located within the AO facility fence line. The remaining valves are located immediately adjacent to the fence line in previously acquired TRWD ROW. Along with the valving improvements, RC and CC pipe segments with larger diameter outlets are expected to be included in this first phase of AO project. A galvanic system with zinc anodes was installed on Line J with insulating flange kits at crossover connections near AO and KBR, however since this project the TRWD standard has been to go with monolithic isolation joints. The corrosion control design team, in coordination with TRWD, will assess isolation and cathodic protection in this facility as part of the project. Operational improvements associated with this project include restoring the identified valves to a new useful service life, eliminating common maintenance issues, and upsizing supply lines to relieve velocity constraints.</p><p>This project will also include the corrosion control engineering design for the replacement of the adjacent Richland Chambers and Benbrook pipelines galvanic systems that are currently installed and have reached their end of useful life. </p><p><img src=\"https://govlist.s3.us-west-1.amazonaws.com/images/production/feb079fe-0e23-4663-81a2-9d3f0d5e8c50\"></p><p style=\"text-align: center;\"><span style=\"font-size: 14px;\">SECTION 1E AND 1D PIPELINE AND ARLINGTON OUTLET IMPROVEMENTS PROJECT LOCATION</span></p>",
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