8:30-8:55 a.m.
Testing to Facilitate Structural Classification Designations
Chris Macey, P.E., Americas Technical Practice Leader-Condition Assessment & Rehabilitation, AECOM
The rehabilitation of water mains and other pressure conduits by relining methods is a rapidly emerging technology. The most widely accepted guideline for designating structural lining classifications is contained in. While the AWWA M28 Rehabilitation of Water Mains provides qualitative descriptions of different classifications (“structural,” “semi-structural” and “non-structural” linings) there are no standardized tests that quantitatively define them. This often leads to different interpretations and selective use in qualifying products as semi-structural or fully structural for different applications. This presentation provides an overview of the work being done by internationally recognized industry experts. It compares the design approaches, test development, pending results and plans to establish common, objective and verifiable criteria based on sound engineering principles for assessing fitness for purpose of pressure liners in different, but clearly defined, applications.

9:00-9:25 a.m.
Fiber Reinforced CIPP Under an Interstate
Chantal Evans, Business Development Manager-Rocky Mountain Region, Insituform
In May 2015, a project unlike any of its kind was completed in Cedar City, Utah. A 50-year old ductile iron pipe was in need of repair. The location of the project was precarious as it ran directly underneath a major interstate. Getting permission to close and dig up the roadway would be difficult, not to mention costly. City council looked to alternative solutions, including boring, but ultimately decided on fiber-reinforced CIPP. The project entailed 310 feet of 10” CIPP lining. Pressure-rated at 150 psi, the pipeline required a structural solution. Insituform’s glass fiber-reinforced product was used to line the pipe according to the client’s design specifications. The project was successfully completed in just two days and was even featured in local news. This presentation will cover the design and bid process, along with product and detailed installation information.

9:30-9:55 a.m.
Mill Creek Drainage Relief Project for City of Dallas
Todd Woodson, P.E., Senior Project Manager, Halff Associates Inc.
Mill Creek and Peaks Branch watersheds in Dallas developed in the 1930s. The open channels that were Mill Creek and Peaks Branch became horseshoe culverts and large box culverts that were then constructed into roughly a 5-year storm frequency capacity. A similar situation occurred in the State‑Thomas area immediately northeast of downtown Dallas. With redevelopment and increased imperviousness, storm drain capacities have diminished to close to a two-year frequency. Drainage relief for the Mill Creek/Peaks Branch/State-Thomas areas will be accomplished through the design and construction of a single 30-foot diameter, 27,000-foot long drainage relief tunnel.  The deep tunnel will bisect the watersheds, and provide 100-year, or near 100-year, capacity in the existing downstream storm drains. The tunnel will be mined in the Austin Chalk formation between 100 and 150 feet below the surface and will outfall to White Rock Creek.

woodsonTodd Woodson, P.E., senior project manager at Halff Associates Inc., has 20 years of experience in design, management and construction of heavy-civil projects. His design background includes airfield, military construction, land development, transportation and drainage-relief projects. Most recently, he served as project manager for the Mill Creek/Peaks Branch/State-Thomas Drainage Relief Tunnel in Dallas. He received his B.S. in Civil Engineering from Texas A&M University.

10:00-10:25 a.m.
Assess, Address Approach Saves Arlington $8 Million
Robert Stanley, P.E., Senior Planning Engineer, City of Arlington, Texas
Andy Dettmer, Ph.D., P.E., Senior Project Manager, Pure Technologies
This presentation will review the results from the Green Oaks pipeline condition assessment project involving 42”, 48”, and 54” PCCP. This pipeline was originally slated to be replaced due to expensive past failures. However, based on the AWWA’s recommendation, Arlington elected to assess the PCCP to determine the extent of required repair. The inspection results revealed that only 27 pipes (4.5%) had any distress, and only five pipes (1.0%) had 25 or more broken wire wraps. Arlington estimates that the Assess & Address approach saved the city more than $8 million versus replacing the pipeline.

stanleyRobert Stanley, P.E., senior engineer, oversees the master planning, condition assessment and asset management for the city of Arlington’s water distribution and wastewater collection systems. Prior to joining Arlington in 2005, he was a consultant for 10 years performing hydraulic modeling analysis for water, wastewater and stormwater systems within Texas and Florida. He received a B.S. in Civil Engineering from Texas A&M University.

10:30-10:55 a.m.
Time, Cost Savings of Sludge Drain Pipe Lining for DWU
Nash Reddy, P.E., Project Manager; and Ed Smith, P.E., Construction Manager; Jacobs Engineering Group Inc.
Dallas Water Utilities (DWU) had two issues associated with the Primary Sedimentation Basins at the Elm Fork WTP, both related to the sludge drain lines located underneath the basins. One involved removing the Basin 2 (the middle basin) floor and repairing the leaking sludge lines. During the demolition phase, Jacobs Engineering proposed cutting the slab into 8′ x 8′ pieces and lifting them from the basin with a crane, as an alternative to the original method (hoe ram and bobcats) that resulted in reducing the demolition time by six weeks and cost savings of $255,000.  On the second initiative, installing CIPP linings on the drain lines beneath all three basins, Jacobs enabled DWU to comply with the Major Maintenance contract requirements, while saving 30 days of construction time and $494,813.

11:00-11:25 a.m.
Irving’s Emergency Repair of an Exposed 84” Pipe
Jimmy Sibert, P.E., Utilities Operations Engineer, City of Irving Water Utilities
Jeffery Hogan, P.E., Water Conveyance Program Manager, North Texas Municipal Water District
Ben Stephens, P.E., Senior Project Manager, Halff Associates Inc.
The City of Irving and North Texas Municipal Water District (NTMWD) jointly operate and maintain an 84” raw water transmission line that transfers water from Lake Chapman to Lake Lewisville for the City of Irving, and to Lake Lavon for the NTMWD. During a June 2015 aerial survey of the pipeline to inspect portions of the line difficult to access by land, the City of Irving discovered that the South Sulphur River had dramatically eroded and the 84” pipeline was exposed, undercut and at risk of failure. Repair of the crossing was declared an emergency. Halff Associates was retained to design the repair and assist with selection of a contractor.  Construction work, including emergency pipe stabilization measures and installation of permanent channel erosion protection facilities, was completed in August 2016.

jimmy-sibertJimmy Sibert, P.E., is the water utilities operations engineer for the city of Irving, TX.  He has a background in the design of water transmission pipelines, pump stations and distribution systems. He currently supports the city’s water utilities operations, manages facility projects for the water utilities distribution system, and manages projects associated with the city’s Lake Chapman raw water supply transmission system.

stephensBen Stephens, P.E., is a civil engineer and project manager at Halff Associates Inc. During his 13 years at Halff, he has performed study, design, management, and review of water and wastewater improvement projects for various municipalities and entities throughout the Dallas-Fort Worth metroplex. He earned his Bachelor’s degree from Texas Tech University and a Master’s degree from the University of Texas at Arlington, with specialization in Infrastructure Engineering and Management.

11:30-11:55 a.m.
96 Large-diameter Pipe Repairs in 30 Days for Dallas
Eduardo Valerio, P.E., Engineering Services Program Manager, DWU Engineering Services
Johnny Partain, P.E., Senior Engineer-Distribution Division, City of Dallas Water Department
Andy Dettmer, Ph.D., P.E., Senior Project Manager, Pure Technologies
The 96” Jim Miller transmission water line is a critical source of Dallas’ water supply, providing up to one-third of its water capacity. Built in 1982, the pipe is composed of a steel liner embedded in a concrete core, wrapped with a tightly wound high-strength wire and finished by a final coating of concrete. The high strength wire is what gives this pipe most of its strength and when corroded or broken, it weakens the pipe, making it prone to major failures. A condition and risk assessment conducted by Pure Technologies revealed 1,408 feet of pipe with structural distress; 80 pipe segments needed immediate replacement and 18 segments needed immediate repair. All of this work was completed in four weeks during the low water demand period in February of 2014.

valerioEduardo Valerio, P.E., has over 13 years of experience with Dallas Water Utilities, currently working in the Engineering Services and Pipeline Project Management programs. He earned his B.S. in Mechanical Engineering from the University of Texas at El Paso, and has a professional engineering license in the state of Texas.

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