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Development of the Risk and Resilience Assessment Arden Hills, MN 1 KEY PERSONNEL AND BACKGROUND Christopher Harrington, PE I Project Manager & Associate EXPERENCE 16 Years EDUCATION MS, Civil Engineering, University of Minnesota, Twin Cities – 2009 BCE, Civil Engineering, University of Minnesota, Twin Cities - 1998 REGISTRATION/LICENSE Professional Engineer, MN, 49831 Chris’ 16 years of experience in civil & environmental engineering consist of working in municipal drinking water services, international development of drinking water systems, wastewater treatment research, civil engineering consulting, and education regarding civil engineering design, water system operation and maintenance, and public health. Chris has served as a technical lead and project manager during planning, design, construction, and troubleshooting of more than a dozen potable water, wastewater and stormwater pump station projects for pressure boosting, wastewater conveyance, flood protection, stream augmentation, irrigation & combined sewer separation. Chris has also presented his projects at CSWEA, MWOA, and AWWA events and has previously served as state section chair for CSWEA. SELECTED PROJECT EXPERIENCE Potable Water & Wastewater SCADA Improvements Design & Construction - City of Arden Hills, MN Pursuit Leader, Project Manager For this project we designed improvements to the City’s utility monitoring and control (SCADA) system. The goals for the project were: (1) to provide Arden Hills with a single monitoring system, for both water and wastewater, possessing technology for both current replacement and future expansion , and (2) to improve the reliability and speed of communication between the water tower and the booster station. We evaluated cellular and radio technologies for communicating between the tower and booster station and settled on dedicated spread spectrum radio telemetry to monitor and report water level, power failure, and intrusion at their water tower. We recommended radio telemetry due to its higher reliability and speed compared to cellular systems. To complete the design we wrote a request for proposals which the City used to use to hire the services of a systems integrator to complete the installation. Booster Pump Transient Analysis Risk Analysis - St. Paul Regional Water Services - St. Paul, MN Pursuit Leader, Project Manager For this project we evaluated the efficacy of a detail that SPRWS requires developers to follow wh en they install booster stations for their development projects. We performed a hydraulic transient analysis that identified the primary causes of added risk of hydraulic transients which included surge tank size, surge tank location, system flow rate, total dynamic head of the system, and the size of the City main feeding the development. Based on our assessment we recommended that SPRWS update the detail to include a surge tank on both sides of booster stations since that arrangement provided the lowest risk to the City piping as well as the piping in the development. We also identified that the current rule of thumb for sizing the surge tanks provides a significant factor of safety to protect against low pressures on both sides of the station. Water Hammer & Corrosion Risk Assessment - Western Lake Superior Sanitary District, MN Pursuit Leader, Project Manager For this project we assessed the interrelated risks of corrosion and hydraulic transients in three of the larger ductile iron force mains in the state of Minnesota. We performed high-speed transient pressure monitoring, hydraulic transient modeling, as well a corrosion risk assessment based on the identifiable causes of corrosion in force mains. We performed our analysis and assessment on the Scanlon Force Main (4.6 miles of 30” and 42” DIP and FRP), Knowlton Creek Force Main (4.9 miles of 48” and 54” DIP), and the Carlton Force Main (2.2 miles of 14” DIP). We provided recommended improvements for all three pipelines to minimize the risk to their infrastructure.