Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

 
 
Session Overview
Session
Session 25A: Collection & Conveyance
Time:
Wednesday, 15/Sept/2021:
8:00am - 10:15am

Location: Room 420A
East Building

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Presentations
8:00am - 8:45am
ID: 236 / Session 25A: 1
Main Technical Program
Topics: Collection and Conveyance
Keywords: Collection, Rehabilitation, Manholes, Corrosion

Corroded Manhole Assessment, Rehabilitation Design, and Construction

Neil Jenkins1, Chris Kossow2

1Jacobs, Boise ID; 2Eagle Sewer District, Eagle ID; ,

Concrete manholes should have more structural strength than peanut butter, but PB-consistency concrete is exactly what Eagle Sewer District found as they conducted their periodic inspection of one section of collection system manholes. The culprit was found to be hydrogen sulfide corrosion from two nearby forcemain discharges. These forcemains, coupled with a very steep sloped pipe (up to 8 percent) down a hillside farther down the main were enough to release H2S that corroded the manholes faster than expected. Compounding the problem was the location of this main, through a high-end neighborhood and adjacent to a golf course. The groundwater up on the hill was not a factor, but the section at the bottom of the hill was in nearly 10-feet of groundwater.

The manholes were assessed first visually and then with a scrape test. From the ground, the 15 to 18-foot deep manholes appeared to be in good to fair condition. The scrape test was performed and the softened concrete sluffed from the wall like tooth paste or soft plaster. The downstream section of the system yielded less than 1-inch of concrete loss. As we worked upstream to the base of the hill and closer to the pump station discharges, up to almost 2-inches was discovered. Next to the pump station discharge, 3 inches of the 5-inch thick manhole wall was missing.

In addition to the condition assessment approach, this presentation will discuss the manhole rehabilitation methods that were considered. These include manhole replacement, liners, inserts, structural coating, and non-structural coatings for corrosion protection. The final design that resulted and the ultimate rehabilitation project will be presented. Lessons learned that will be shared include the how to complete rehabilitation technologies and coordination with neighbors and interested agencies. The manholes were successfully rehabilitated and have performed well for nearly a year and a half.

Brief Biography and/or Qualifications
Chris Kossow
Mr. Kossow is the Assistant Operations Manager at Eagle Sewer District. He is a seasoned collection system manager and plant operator who holds both collection system and wastewater treatment licenses. He coordinates the collection system assessment, cleaning, and maintenance activities for the District. He also leads the wastewater operations team for the District.

Neil Jenkins, P.E.
Mr. Jenkins is a water and wastewater engineer with Jacobs in Boise, Idaho. He has a diverse background and experience supporting water and wastewater facility planning efforts, stormwater management plans, capital improvement plans, condition assessment, facility design, and construction management. His experience spans all phases of the design process from field data collection and initial investigations, to concept development and final design, to construction management and startup services.


8:45am - 9:30am
ID: 226 / Session 25A: 2
Main Technical Program
Topics: Collection and Conveyance
Keywords: collections, conveyance, spiral winding

Bringing Spiral Winding Rehabilitation to the Pacific Northwest

Ron Bard1, Yang Zhang2, Angela Richardson1

1Brown and Caldwell, United States of America; 2City of Portland, Bureau of Environmental Services; ,

Virtual Speakers

Spiral Wound Technology TM (SPR) is a pipeline rehabilitation method using strips of PVC or HDPE. Winding machines unroll strips of material that form to the pipe's shape, creating a new lining. The City of Portland Bureau of Environmental Services (BES) will be using the PVC SPR material on the Carolina Trunk rehabilitation project. Utilities across the globe have installed lining using SPR, including a few in the USA, but this is the first application in the Pacific Northwest. BES often uses pipeline rehabilitation on its aging infrastructure to extend the useful life of its sewer pipes. Upon successful completion of this pilot project, BES plans to add SPR to its toolbox of available rehabilitation techniques for future projects.

A significant advantage of SPR is the ability to install the material without flow diversion. With this method, it is possible to install lining with live flow during low flow periods. Since the Carolina Trunk is a combined sewer, we scheduled the work to take place at night during the summer when there are no rain events expected. Due to the Carolina Trunk's location along a busy arterial, being able to rehabilitate the sewer without diverting flow is critical to project success.

Constructed in 1909, the Carolina Trunk is a 51-inch diameter cast-in-place monolithic concrete circular sewer pipe. Several inspections revealed that the pipe is in fair to poor condition and needs rehabilitation. Defects observed throughout the pipe included longitudinal cracking and pipe deterioration with exposed aggregate and pitting. This project will rehabilitate approximately 800-feet of the trunk using SPR rehabilitation.

Brief Biography and/or Qualifications
Ron Bard has over 40-years of experience in civil engineering. He specializes in conveyance system design and is an expert in pipelines, pump stations, and rehabilitation of wastewater facilities. Ron is highly experienced in the technical elements and project management. He has a Project Management Professional (PMP) certification. Ron helps public utilities find innovative and creative solutions to their difficult infrastructure problems, finding cost-effective ways to extend the useful life of their aging facilities. He is highly effective in facilitating a collaborative process with diverse stakeholders.

Yang Zhang is a Senior Engineer in the City of Portland Bureau of Environmental Services. He has a PhD degree of Civil & Environmental Engineering, and over 15 years of experience in municipal water and wastewater industry. He has worked in multiple engineering consulting firms and completed over 30 water and wastewater projects. He currently manages sewer rehabilitation projects in the BES Large Scale Sewer Rehabilitation Program and serves as a design manager to oversee design and construction services provided by engineers and consultants.


9:30am - 10:15am
ID: 159 / Session 25A: 3
Main Technical Program
Topics: Collection and Conveyance, Utility & Assessment Management, Industrial Pre-Treatment
Keywords: water quality sensing, collection systems, telemetry, FOG, ragging

Implementation of Telemetered Water Quality Sensors in the Sanitary Collection System

Scott Mansell, Jason Cook, Greg Arrigotti, Jeff Van Note, Ting Lu, Ken Williamson

Clean Water Services, United States of America;

Collecting continuous, reliable water quality data from the sanitary collection system without an excessive maintenance burden is a serious challenge for utilities, but one that is increasingly necessary for developing enhanced source control programs and protecting treatment plants from potential upsets. For several years, Clean Water Services (CWS) piloted various technologies, implementation methods, installations, and cleaning devices. While none of these pilots were ultimately successful, important lessons were learned in each of them that helped drive CWS towards successful implementation. Over the past two years, CWS has successfully developed and implemented a telemetered, continuous water quality sensing network in its sanitary collection system and has already been successful in tracking down and eliminating a consistent source of problems for one its treatment plants. CWS has developed a unique sensor holder that minimizes ragging and made use of robust sensors that are less sensitive to fats, oil, and grease buildup. To test this technology in addition to future technologies, CWS developed a test flume at its Forest Grove treatment plant that uses post-grit screen influent. This flume can be adjusted to simulate various velocities, depths, and sewer sizes and allows for the study and testing of different sensors, cleaning devices, and containment devices with close observations in a controlled environment that wouldn’t be possible in the sanitary collection system. CWS has conducted various experiments using this flume to study the factors that affect longevity, film buildup, and maintenance frequency for various probes. The lessons learned through CWS’s first few years of unsuccessful pilot studies were presented at PNCWA in 2019. In this talk, CWS will discuss how it finally became successful at developing and implementing a network of water quality sensors in the sanitary collection system, and where it is going from here.

Brief Biography and/or Qualifications
Scott Mansell is a Senior Engineer in the Research and Innovation Department at Clean Water Services in Hillsboro, Oregon. Scott’s work in the research program focuses on studying and solving problems using data collection and analysis, modeling, and contaminants of emerging concern. He manages the effort for developing, testing, and implementing continuous, telemetered water quality sensors and autosamplers for the R&I department in the sanitary collection system as well as the creeks and rivers in the watershed. He also leads the projects tracking down industrial and other sources that impact treatment processes at the treatment plants to support the source control program. Scott earned a PhD in Environmental Engineering from UC Berkeley in 2012, and has worked in both the private and public sector in the environmental engineering field since then. He joined CWS in 2017


 
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