GoldBarWastewaterTreatmentPlant 1097750Street Edmonton,AlbertaT6A2E9 Canada epcor.com February 25, 2021 Alberta Environment and Parks #111 Twin Atria Building 4999-98 Avenue Edmonton AB T6B 2X3 RE: 2020 Annual Wastewater Treatment and Wastewater Collection Report for Approval to Operate 639-03-06 Attention: Fengqin Wang, Municipal Approvals Engineer Dear Ms. Wang, Please find the 2020 Annual Wastewater System Report for Alberta Environment and Parks Approval to Operate 639-03-06 as required under section 6.3.4. Respectfully, Geoff Heise Senior Manager, Environmental & Scientific Services, EPCOR Attachment – 2020 Annual Wastewater System Report cc: [email protected] Mohammad Rahman, EPEA Team Lead, AEP Mohammad Habib, Approvals Manager, AEP Craig Bonneville, Director, Gold Bar WWTP, EPCOR Steve Craik, Director, QA & Environment, EPCOR Cindy Shepel, Director, Drainage Operations, EPCOR Alfredo Suarez, Senior Manager, Gold Bar WWTP Operations, EPCOR Angus Grant, Senior Manager, Monitoring & Compliance, EPCOR Ross Bulat, Manager, Environmental Monitoring & Compliance, EPCOR 2020 Annual Wastewater Treatment Report EPCOR Water Services Inc. Edmonton, Alberta 2020 Annual Wastewater System Report Submitted to: The Province of Alberta Alberta Environment and Parks (AEP) As per requirements of: Approval to Operate No. 639-03-06 February 2021 Executive Summary The following report contains two parts, Part I: Wastewater Treatment Plant and Part II: Wastewater Collection System, in order to meet the requirements of Approval to Operate No. 639-03-06. The 2020 Annual Wastewater Treatment Plant Report is separated into an Annual Wastewater Treatment Report, an Annual Air Pollution Control System Report, an Annual Ambient Air Report, and a summary of contraventions reported, as outlined in the Approval to Operate. New requirements for the 2020 Wastewater Treatment Plant annual report include the following: - reporting the daily average H2S from the effluent air stream of the air pollution control systems; - a summary of operational issues encountered by the air pollution control systems; - additional information regarding odour complaints; and - ambient air H2S monitoring results. The 2020 Annual Wastewater Collection System Report summarizes the completed and planned major rehabilitation projects, the interconnection control strategy, storm and CSO volumes and loadings, and other requirements as per Approval to Operate no. 639-03-06. 2020 Annual Wastewater Treatment Report Part I: Wastewater Treatment Plant Report 2020 Annual Wastewater Treatment Report EPCOR Water Services Inc. Gold Bar Wastewater Treatment Plant Edmonton, Alberta 2020 Annual Wastewater Treatment Plant Report Submitted to: The Province of Alberta Alberta Environment and Parks (AEP) As per requirements of: Approval to Operate No. 639-03-06 February 2021 2020 Annual Wastewater Treatment Report Table of Contents Section Approval No. 639-03-06 Page Requirement 2020 Overview N/A 4 2020 Annual Wastewater Treatment Report 6.3.3 (a) (i) 5 Gold Bar WWTP Performance 6.3.3 (a) (i) (A) and (B) and 5 Operations Plan – Sections 9 and 10 Assessment of Annual Monitoring Results 6.3.3 (a) (i) (C) 10 Chemical Added to the Wastewater Treatment 6.3.3 (a) (i) (D) 11 Process Names of Supervising Operators 6.3.3 (a) (i) (E) 12 Uncommitted Hydraulic Reserve Capacity 6.3.3 (a) (i) (F) 13 Wet Weather Summary 6.3.3 (a) (i) (G) 13 Summary of Operational Issues 6.3.3 (a) (i) (H) 13 2020 Annual Air Pollution Control System Report 6.3.3 (a) (ii) 14 Summary of Air Pollution Control System 6.3.3 (a) (ii) (A) 16 Monitoring Assessment of Monitoring Results 6.3.3 (a) (ii) (B) 17 Chemicals Consumed by Scrubbers 6.3.3 (a) (ii) (C) 17 Summary of Air Pollution Control System 6.3.3 (a) (ii) (D) 18 Operational Issues 2020 Annual Ambient Air Report 6.3.3 (a) (iii) 21 Summary of Ambient Air Monitoring 6.3.3 (a) (iii) (A) 21 Summary of Public Odour Complaints 6.3.3 (a) (iii) (C) 23 2020 Summary of Contraventions and Notifications to 6.3.3 (a) (iv) and Operations 24 AEP Plan – Section 1 2020 Biosolids Program Summary Operations Plan – Section 5 26 Appendix A – Monthly Plant Performance Reports Appendix B – WWTP Chemicals Appendix C – Operations Monthly Reports Appendix D – Air Pollution Control System Data Appendix E – Scrubber Chemicals Appendix F – Fence Line H2S Readings Appendix G – Odour Complaints Appendix H – Nutri-Gold Summary Appendix I – Third Party Agricultural Summary Appendix J – Non-Ag Biosolids Management Report Page 1 of 26 2020 Annual Wastewater Treatment Report Tables Table 1: Limits for Treated Wastewater (Approval to Operate Table 5-1) .................................... 5 Table 2: Monitoring - Wastewater System (Approval to Operate Table 6-1) ................................ 5 Table 3: 2020 Gold Bar WWTP Performance ............................................................................... 7 Table 4: 2020 Reclaimed Water Quality ....................................................................................... 8 Table 5: 2020 Effluent Toxicity ...................................................................................................... 9 Table 6: 2020 Summary of Gold Bar Wastewater Proficiency Testing ......................................... 9 Table 7: List of Certified Wastewater Treatment Operators (as of December 2020) .................. 12 Table 8: Air Pollution Control System Operating Limits (Approval to Operate Table 5-2) .......... 14 Table 9: Monitoring and Reporting - Air Pollution Control Systems and Ambient Air (Approval to Operate Table 6-2) ................................................................................................... 14 Table 10: Air Pollution Control System Report - Part I ................................................................ 16 Table 11: Air Pollution Control System Report - Part II ............................................................... 17 Table 12: Summary of Scrubber Operational Issues .................................................................. 18 Table 13: Summary of Ambient Air Monitoring Results .............................................................. 21 Table 14: Summary of Gold Bar WWTP Odour Complaints ....................................................... 23 Table 15: Summary of Contraventions ....................................................................................... 24 Table 16: Summary of Notifications to AEP ................................................................................ 24 Table 17: Summary of Biosolids Program .................................................................................. 26 Figures Figure 1: 2020 Monthly Gold Bar WWTP Wastewater Effluent Limit Performance (WELP) Index ............................................................................................................................ 10 Figure 2: Gold Bar WWTP Wastewater Effluent Limit Performance (WELP Index) 2005-2020 .................................................................................................................... 11 Figure 3: Location of H2S Monitoring .......................................................................................... 22 Page 2 of 26 2020 Annual Wastewater Treatment Report Acronyms ACRWC Alberta Capital Region Wastewater Commission AEP Alberta Environment and Parks CBBRF Clover Bar Biosolids Recycling Facility CBOD Carbonaceous Biological Oxygen Demand CSO Combined Sewer Overflow EPE Enhanced Primary Effluent EPEPS Enhanced Primary Effluent Pumping Station EPT Enhanced Primary Treatment FE Final Effluent FEC Final Effluent Combined GBWWTP Gold Bar Wastewater Treatment Plant H2S Hydrogen Sulfide HSE Health, Safety, and Environment ISO International Organization for Standardization ML Megalitres MLD Megalitres per Day MLSS Mixed Liquor Suspended Solids NH3-N Ammonia-Nitrogen NSR North Saskatchewan River ORP Oxidation-Reduction Potential PE Primary Effluent SOP Standard Operating Procedure TKN Total Kjeldahl Nitrogen TP Total Phosphorus TSS Total Suspended Solids UV Ultraviolet WELP Wastewater Effluent Limit Performance WWT Wastewater Treatment WWTP Wastewater Treatment Plant Page 3 of 26 2020 Annual Wastewater Treatment Report 2020 Overview The Gold Bar Wastewater Treatment Plant (WWTP) located on the banks of the North Saskatchewan River in Edmonton, Alberta successfully maintained the ISO 14001:2015 (Environmental Management System) and the ISO 45001:2018 (Occupational Health and Safety Management System) certificates for its Integrated Management System. Notable events in 2020 include the addition of H2S monitoring to the air pollution control system scrubbers, upgrades to Fermenter 1 and Fermenter 4, cleaning of Digester 2 and Digester 6 heat exchangers, upgrades to Clover Bar Lagoon Cell 3E, upgrades to Secondary Clarifier 7 and Secondary Clarifier 3, the removal of Digester 5 from service due to structural damage, seeding and placing Digester 3 into service, and ongoing upgrades to the Diversion Structure. The true dry weather flow in 2020 did not change from 2019 and was 263 MLD. 2020 hosted a significant number of wet weather events (21) compared to previous years which resulted in an increased number of secondary bypasses (92). The plant performed very well with a WWTP Effluent Limit Performance (WELP) index of 19.0%. Page 4 of 26 2020 Annual Wastewater Treatment Report 2020 Annual Wastewater Treatment Report Gold Bar WWTP Performance The Gold Bar WWTP final effluent discharge limits of Approval to Operate 639-03-06