Edmonton Waterworks 2020
Total Page:16
File Type:pdf, Size:1020Kb
EDMONTON WATERWORKS ANNUAL REPORT TO ALBERTA ENVIRONMENT AND WATER Approval Number 638-03-00 2020 2019 ANNUAL REPORT TABLE OF CONTENTS PAGE 1.0 Overview 1.1 Overview .................................................................................................................. 1 1.2 Process Schematic – Rossdale (Plants 1 & 2) ......................................................... 5 1.3 Process Schematic – E. L. Smith (Plant 4) .............................................................. 6 1.4 Summary of Violations and Notifications .................................................................. 7 1.5 Alberta Environmental Operator Certifications ....................................................... 10 1.6 Demand Production Statistics (Estimated highlift flow) .......................................... 16 1.7 Energy Consumption and Usage ........................................................................... 17 2.0 Raw Pumpage, Treated Pumpage and Distribution System 2.1 Storage Capacities of Reservoirs .......................................................................... 18 2.2 Reservoir Pressure Operating Ranges .................................................................. 19 2.3 Fire Hall and other City Pressure Limits ................................................................. 20 2.4 Regional Customers .............................................................................................. 21 2.5 Pumping Facilities within the City of Edmonton Distribution System ..................... 22 2.6 Production Summary ............................................................................................. 23 2.7 Raw Water Intake (ML) .......................................................................................... 24 2.8 Treated Water Production (ML) ............................................................................. 25 3.0 Water Quality 3.1 Raw Water Quality – North Saskatchewan River ................................................... 26 3.2 Treated Water Quality Entering the Distribution System ........................................ 27 3.3 Rossdale Filters 1 - 9 Particle Counts (no./mL,>2um) ........................................... 28 3.4 E.L. Smith Filters 1 - 9 Particle Counts (no./mL,>2um) .......................................... 39 3.5 E.L. Smith Filters 10 -18 Particle Counts (no./mL,>2um) ....................................... 30 3.6 Rossdale Filters 1 – 9 Turbidity (NTU) ................................................................... 31 3.7 E.L. Smith Filters 1 – 9 Turbidity (NTU) ................................................................. 32 3.8 E.L. Smith Filters 10 – 18 Turbidity (NTU) ............................................................. 33 3.9 Combined Filter Effluent Water Quality .................................................................. 34 3.10 Rossdale UV Disinfection – Filters 1 - 3 ................................................................. 35 3.11 Rossdale UV Disinfection – Filters 4 - 6 ................................................................. 36 3.12 Rossdale UV Disinfection – Filters 7 - 9 ................................................................ 37 3.13 E. L. Smith UV Disinfection – UV Reactors 1 - 4 ................................................... 38 3.14 Log Removal .......................................................................................................... 39 4.0 Chemicals 4.1 Liquid Alum Chemical Consumption ...................................................................... 40 4.2 Primary Polymer (Magnafloc LT 27AG) Chemical Consumption ........................... 41 4.3 Carbon Chemical Consumption ............................................................................. 42 4.4 Sodium Hypochlorite Chemical Consumptin .......................................................... 43 4.5 Filter Polymer (Magnafloc LT 7996) Chemical Consumption ................................. 44 4.6 Aqua Ammonia Chemical Consumption ................................................................ 45 4.7 Caustic Soda Chemical Consumption .................................................................... 46 4.8 Fluoride Chemical Consumption ............................................................................ 47 4.9 Sodium Bisulfite Chemical Consumption ............................................................... 48 5.0 Waste Streams 5.1 Waste Stream Volumes (ML) ................................................................................. 49 5.2 Rossdale Clarifier Blowdown, Clarifier Washdown and Backwash Water Waste Stream Data ........................................................................................................ 50 5.3 Rossdale Waste Stream Data ................................................................................ 51 5.4 E.L. Smith Clarifier Blowdown, Clarifier Washdown and Backwash Water Waste Stream Data ........................................................................................................... 52 5.5 E.L. Smith Waste Stream Data .............................................................................. 53 6.0 Reservoir Chlorine Residual Part 1 .............................................................. 54 6.1 Reservoir Chlorine Residual Part 2 ......................................................................... 55 7.0 Quality Assurance 7.1 Water Quality Objectives ...................................................................................... 56 7.2 Summary of Major Chemicals, Microbiological and Physical Parameters ............ 57 7.3 Summary of Laboratory Analysis .......................................................................... 58 7.4 Bacteriological Data: Water Treatment Plants ...................................................... 59 7.5 Bacteriological Data: Distribution System ............................................................. 65 7.6 Giardia and Cryptosporidium ................................................................................ 70 7.7 Treated Water Entering the Distribution System .................................................. 73 7.8 Rossdale and E.L. Smith combined Filter Effluent Water Analysis ....................... 82 7.9.a Routine Distribution System ................................................................................. 84 7.9.b Complaint Investigations ...................................................................................... 89 7.10 Castledowns, Clareview and Kaskitayo Reservoir................................................ 92 7.11 Londonderry, Millwoods and North Jasper Place Reservoir ................................. 95 7.12 Ormsby, Papaschase 1 and Papaschase 2 Reservoir ......................................... 98 7.13 Rosslyn 1, Rosslyn 2 and Thorncliff Reservoir ................................................... 101 7.14 Disinfection Byproducts ...................................................................................... 104 7.15 Raw River Water ................................................................................................ 105 7.16 Statistics on Water Quality Complaint Samples ................................................. 113 7.17 Lead Management Program ............................................................................... 114 7.18 Lead Service Line Program – by Home Sample ................................................. 116 7.19 Reportable Detection Limits ............................................................................... 117 7.20 Explanation of Notations Used ........................................................................... 120 1.1 Overview Through 2020, EPCOR Water Services Inc. (EWSI) continued to satisfy all water demand requirements while meeting our strict water quality criteria. Total demand in 2020 was similar to 2019 and lower than 2018. With COVID-19 and the associated restrictions in 2020, EWSI saw a noticeable decrease in commercial consumption with only a small corresponding increase in residential demands. High raw water color in January and early February, at times in excess of 10 TCU, prevented Rossdale and E.L. Smith WTPs from operating in Direct Filtration (DF) for a number of days. When color decreased in early February, both WTPs converted to DF and remained in DF until April 8, when they were converted to conventional treatment in advance of spring runoff. In mid-April, Strawberry, Modeste and other creeks upstream began to show signs of freshet and carbon was started at both WTPs on April 12. Some odours were detected and carbon was fed for 16 days. Although color peaked at 118 TCU, spring runoff did not result in any significant taste and odour concerns in the treated water. Heavy rainfall events in May and July led to high raw water color (>80 TCU) and made it necessary to feed carbon on four separate occasions, approximately 15 days total. Color peaked at 173 TCU and turbidity at 1,900 NTU in late May. Edmonton WTPs continued to focus on optimizing chemical dosing and minimizing release of water treatment plant solid residuals to the NSR. Zeta Potential is being monitored at the EL Smith WTP during Direct Filtration to help filter polymer dose optimization and to increase plant performance during DF operation. A similar analyzer has been purchased for Rossdale WTP. With dry weather, raw water quality improved significantly in late August. With raw water color averaging less than 5 TCU, E.L. Smith WTP converted to DF on