volume 1 - Halifax Regional Municipality

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Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service Water System Summary The water system infrastructure is summarized in Table 3.3. Table 3.3 Summary of Water System Infrastructure Asset Category Number of Assets Pressure Reducing Valves (PRV) 81 Large WSP 3 and 2 backups Small WSP 6 Distribution Mains Transmission Mains 1187 km 220 km Water Pumping Stations 20 Dams 6 Concrete Storage Reservoirs 7 Steel Storage Reservoirs 9 Appurtenances (Valves, and Meters) Valves – 13,027 Meters – 80,000 The water system currently meets all the Levels of Service presented in Table 3.1 including full compliance with present drinking water quality standards. 3.4.2 Wastewater System Installation of central wastewater collection systems commenced in the Halifax and Dartmouth areas towards the end of the 1800s. At that time, most wastewater systems installed were combined, carrying both sanitary sewage and stormwater. Trunk sewers were installed to provide localized drainage and discharged directly to Halifax Harbour at the closest convenient point. As development progressed beyond the boundaries of the core cities, Halifax County adopted a policy of installing separate sanitary sewers in these areas. Stormwater runoff was generally directed to local watercourses while sanitary sewage was discharged directly into Halifax Harbour or into the upper reaches of the core combined collection systems. Commensurate with the construction of these systems, numerous roof and foundation drains were connected to the sanitary sewers. These illegal connections, as well as inflow and infiltration from other sources, continue to cause overloading in the sanitary system during even frequent rainfall events. From 1970 onward, increasingly stringent standards were adopted with dual storm and sanitary piped systems. Revision: 2012-10-29 Integrated Resource Plan 19 October 31 2012 Page 52 of 272
Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service Historically, the cities of Dartmouth and Halifax and Halifax County were responsible for wastewater collection and treatment within their own service areas. After the 1996 amalgamation, HRM took over the operation of the wastewater system and in 2007 transferred the system to Halifax Water. In the intervening 5 years Halifax Water has been challenged to bring the system into regulatory compliance and to fully assess the condition of wastewater system assets. Wastewater Treatment Facilities (WWTF) Presently Halifax Water owns and operates 15 wastewater treatment facilities (WWTFs). These WWTFs provide varying levels of treatment, from primary to tertiary, and have a broad range of average day flow (ADF) capacities that range from 45 m 3 /d to 133,920 m 3 /d. Nova Scotia Environment regulates the quality and quantity of effluent discharged from each WWTF through 'Permits to Operate' (PTO) which are specific to each facility. A summary of 14 of the 15 wastewater treatment facilities operated by Halifax Water is presented in Table 3.4. The fifteenth WWTF - Belmont WWTF will soon be decommissioned once the expansion/upgrade of the Eastern Passage WWTF is completed and has not been included in the summary table. Five of the WWTFs (six including Belmont) presently discharge to salt water receiving environments while the remainder discharge to small freshwater lakes or streams. As noted previously, the freshwater bodies have significant restrictions on assimilative capacity and hence limit the ability for continued population growth and WWTF expansion. In future, as treated effluent nutrient requirements for nitrogen and phosphorus become more stringent, additional limitations on WWTF discharges will likely result. This is further discussed in Section 4 under the wastewater regulatory compliance driver and in Section 5, which proposes a new enhanced nutrient reduction program that was ultimately incorporated into the IRP. Based on results from fiscal year (FY) 2010-2011, 10 of the 14 WWTFs were noncompliant with their NSE PTO effluent requirements. 17 Many of the non-compliant effluents exceeded their suspended solids (TSS) or biological oxygen demand (BOD) targets. This is likely at least partly the result of excessive wet weather flows stressing the treatment processes. The widely spread and significant nature of this issue argues for a comprehensive inflow infiltration (I/I) program across most of the WWTF service areas. This is further discussed in Section 5 and Volume 1 Appendix F under a new I/I pilot program as well as in Section 6 in examining the benefits of an I/I program for wastewater demand reduction. 17 Draft Wastewater Treatment Facilities (WWTF) Compliance Plan, Halifax Water, August 2011 Revision: 2012-10-29 Integrated Resource Plan 20 October 31 2012 Page 53 of 272
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Statement Concerning Halifax Water
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volume 1 - Halifax Regional Municipality

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