Bull Run Filtration Project EPA passes a new Portland develops Low - PDF document

12/12/2018 Why are we here today? Portland City Council Bull Run Filtration Project  Authorize the Water Bureau’s recommended December 12, 2018 alternatives for filtration capacity, location and technology. Michael Stuhr , P .E. Administrator Gabriel Solmer , Deputy Administrator Teresa Elliott, P .E. Chief Engineer David Peters, P .E. Principal Engineer 2 Why do we need filtration? Filtration improves public health by removing Cryptosporidium (crypto) from the water 2006 2009 - 2016 2017 Bull Run Filtration Project EPA passes a new Portland develops Low level detections show regulation to protect unique program to protecting Portland water at the against crypto , protect Portland’s water source is no longer sufficient to because it is so from sources of crypto , keep crypto out of the water, resistant to chlorine the program is OHA requires further successful for 5 years treatment, Portland chooses the EPA approved filtration. The Bull Run Filtration Project continues the City’s commitment to serving the best possible water to Portland customers. 3 4 v3 1

12/12/2018 Filtration also provides other benefits Community  Makes Portland’s water safer by removing Conversations microorganisms  Makes Bull Run supply more reliable Prioritizing public outreach and communication to guide this work  Allows Bull Run to be used sooner after an emergency, such as a fire  Online survey  Digital/social media outreach  May reduce the amount of chlorine needed for  Stakeholder interviews disinfection  November 8th Community Forum  Ongoing outreach with potential  Prepares us to respond to future regulations project neighbors 6 Analysis: Initial Procurement Filtration Plant Capacity decisions Method City Council decision 8-29-18 How much focus on four 200 water are we Filtration Plant foundational MGD going to 145 - 160 Capacity elements MGD need? 115 Filtration Plant MGD Location Filtration Plant Technology During a typical year During a hot, dry year The most Portland's pipelines can deliver Recommended capacity 7 v3 2

12/12/2018 Analysis: Filtration Plant Location Proposed Filtration Plant Capacity Where should the filtration plant be located? Recommended capacity alternative: 145 to 160 MGD Powell Butte Powell Butte  Continues Bull Run as Portland’s main water supply , meeting demands on most days in most years  Manages costs by matching filtration plant size to Lusted Hill Lusted Hill Carpenter Lane Carpenter Lane expected water use Bull Run Headworks Headworks Watershed  Allows for future expansion if needed Roslyn Lake Roslyn Lake Larsen’s Ranch Larsen’s Ranch 9 Recommended Filtration Plant Proposed Filtration Plant Location Location Recommended site: Carpenter Lane Proximity to Slopes and Site HGL Tax Lot Size Schedule  Site is at the right elevation and Conduits Geologic Hazards location , so that less pumping is needed Carpenter Lane Pass Pass Pass Pass Pass  Property is already owned by Headworks Fail Pass Fail Fail Pass Portland Water Bureau so avoids the cost of purchasing a new property Larson’s Ranch Fail Pass Pass Pass Pass  Zoning allows a filtration facility Pass Lusted Hill Pass Pass (with Pass Pass  Site is large enough to provide a site expansion) Carpenter Lane is a 95-acre property buffer between the facility and its purchased by Portland for a future Powell Butte Pass Pass Pass Pass Fail treatment facility neighbors Roslyn Lake Fail Pass Pass Pass Pass 11 12 v3 3

12/12/2018 Analysis: Filtration Technology Analysis: Filtration Technology Membranes X High energy use Membrane Slow Sand Factors: X High capital and operating costs • Water quality • Hydraulics Slow Sand • Regulatory X Significant size requirements X Comparative poor water quality • Comparative costs Granular Media • Other utility Granular Media Best operating capabilities comparisons Good water quality Most flexibility Recommended technology is a granular media filtration system. 14 Proposed Filtration Technology Bull Run Filtration will be in Recommended filtration technology: operation by 2027 granular media filtration  Proven technology that produces excellent water quality  Lowest cost technology that can meet desired water quality  Very flexible – it can be adapted to different ICCT project to water conditions and new water quality reduce lead completed April 2022 requirements  Fits on the filtration plant site with room to grow in the future 15 16 v3 4

12/12/2018 Next Steps For City Council  Authorize a design contract, summer 2019  Authorize a professional services contract with Construction Manager/ General Contractor (CM/GC), Questions? end of 2019 17 18 What’s important to customers for the Portland started the project by reaching out to customers Bull Run Filtration Project? Most important:  Water quality  Cost benefit (getting good value from investments) 19 20 v3 5

12/12/2018 Analysis: Filtration Plant Location Analysis: Filtration Technology Site Evaluation Results Granular Media Filtration – How does it work? Met all evaluation criteria Met all evaluation criteria Sites that were eliminated based on: Sites that were eliminated based on: Powell Butte Powell Butte • • Incompatible hydraulics Incompatible hydraulics • • Incompatible zoning Incompatible zoning • • Poor land conditions Poor land conditions • • Land ownership concerns Land ownership concerns Lusted Hill Lusted Hill Carpenter Lane Carpenter Lane Bull Run Headworks Headworks Watershed Roslyn Lake Roslyn Lake Granular media filtration is used at almost all of the large filtration plans in North America Larsen’s Ranch Larsen’s Ranch v3 6