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Niagara River Remedial Action Plan Stage 2 Update Report

Niagara River Remedial Action Plan Stage 2 Update Report

The new Central PS/HRT

The new Central PS/HRT has a capacity of 1200 L/s with a Combined Sewer Overflow (CSO) vortex treatment facility designed for 90% volumetric control at the City’s largest overflow by volume, the Muddy Run Central bypass. The High Rate Treatment Facility peak capacity is 3800 L/s of treated CSO discharge. The HRT facility includes 2 - 13 m diameter, 8 m deep vortex tanks. During wet weather events the combined sewage enters the tanks tangentially at about mid-depth. This causes the sewage to spin which results in improved separation of solids. The treated sewage leaves the tanks over central overflow channel weirs. The separated solids are drawn off at the tank bottom. The underflow with the separated solids is pumped from a common HRT pumping well into the new Central pumping station for further pumping to the Niagara Region Water Pollution Control Plant. The Central Pump Station - High Rate Treatment (HRT) Project represents a significant increase in pumping capacity and associated CSO capture and treatment. This capture eliminates the Muddy Run CSO discharge to the Niagara River resulting in an estimated CSO reduction of 34 occurrences and 577,839 m³ discharge annually. This reduction represents a 12% decrease in CSO occurrences and a 62% reduction in CSO volume City wide. The HRT facility was sized to provide 50% Total Suspended Solids (TSS) and 30% Biological Oxygen Demand (BOD) load reduction. In addition, the HRT facility was designed to allow for future installation of chemical feed equipment to further improve the treatment efficiency. The City of Niagara Falls and the Niagara Region are extremely proud of the positive impact that the Central Pumping Station - High Rate Treatment facility will have on the natural environment for years to come. 161 With regards to reducing inflow/infiltration, the City has been doing the disconnection of residential foundation drains for years and covers the whole cost. 162 The City of Niagara Falls is undertaking a PCP and CSO Abatement Study. 163 Town of Niagara-on-the-Lake: The Town of Niagara-on-the-Lake experiences a large amount of infiltration and flows into the sanitary sewer system during wet weather events. This causes the sewer system to surcharge, which may result in basement flooding. The remediation plan includes correcting conditions which contribute to inflow, such as roof leaders discharging below grade, infiltration from laterals, broken pipes and other infrastructure deficiencies. The Town is working with Niagara Region to carry out flow monitoring that will assist in “before” and “after” analysis of the effectiveness of the measures. 164 161 Report from Bob Darrall, Infrastructure & Asset Manager, City of Niagara Falls. March 31, 2008. 162 Reported at meeting of NWQPS CSO Study Panel on March 2, 2006. 163 Reported during the Niagara Falls PCP Steering Committee Meeting #3, August 24, 2007. 164 Handout at meeting of NWQPS CSO Study Panel on March 2, 2006. Table2: Current CSO Activities and Policies within the Niagara Watershed. 106

Niagara river remedial action plan stage 2 update Appendix 8: Niagara Region Water and Wastewater Projects Identified in the 1995 Stage 2 Table 1: Update 165 to Niagara Region Water & Wastewater Projects (10 Year Capital Program) from Table 5 – Niagara River RAP 1995 Stage 2 Report Project Title/Location Status Comments Modification to Disinfection Systems at Niagara’s Water Treatment Plants NIAGARA REGION Modification to Disinfection Systems at Niagara’s Water Treatment Plants NIAGARA REGION Welland Water Treatment Plant Improvements WELLAND Water Master Servicing Strategy Study/Update NIAGARA REGION Wastewater Master Servicing Strategy Study/Update NIAGARA REGION Parkway Sewage Pumping Station Capacity Improvements FORT ERIE Lakeshore Rd. Sewage Pumping Station Improvements FORT ERIE Dominion Rd. Sewage Pumping Station Improvements FORT ERIE Ricardo/Melville/Front Pumping Station Improvements NIAGARA-ON-THE-LAKE Upgrading Stamford (Niagara Falls) Water Pollution Control Plant (WPCP) NIAGARA FALLS DONE DONE DONE Backwash and process waste no longer discharged directly to the Niagara River. Supernatant discharged with less than 25mg/l suspended solids. Water Treatment Plants now use liquid chlorine (not chlorine gas) and some use Ultraviolet. Equipment upgrades and operational improvements. DONE Completed in 1995 and updated in 2003. DONE Completed in 1995 and updated in 2003. DONE Decommissioned since 1995. Infrastructure improvement program approved in 2005 166 DONE Ricardo/Front – DONE Melville - DECOMMISSIONED DONE Upsized the sewer going to the pumping station. Town upgraded wet weather storage in 1999. Ricardo/Front – one station built approx. 5 years ago. Melville decommissioned since 1995. Equipment upgrades and operational improvements. 167 Optimization of existing process. 165 Updated information provided verbally by Niagara Regional and Municipal engineers in 2005. 166 www.regional.niagara.on.ca/government/works/Capital-Projects.aspx 167 Information provided by Mike Jarzembecki, Regional Municipality of Niagara. March 4, 2008. 107

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