volume 1 - Halifax Regional Municipality

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Halifax Water Integrated Resource Plan Integrated Resource Plan Development and Evaluation Consideration should also be given the timing of other major WWTF upgrades and expansions. They include: • There are about 25 plus current compliance WWTF projects programmed in the early part of the IRP to approximately 2018. • Under the RWWFP, the expansion of the Herring Cove WWTF will be required to accommodate future growth between 2031 and 2036 and the expansion of the Dartmouth WWTF would be required between 2021 and 2026. • The WSER will require upgrade of all three HHSP WWTFs to secondary treatment within 20 years (by 2032). • The Aerotech WWTF will require expansion between 2031 and 2036. In consideration of the benefits of nutrient control, particularly on the smaller receiving waters, and the schedule of expansions and upgrades in the later planning period, a 10- year or 10 plus year timing for nutrient control seems reasonable. Hence, the A level plans (38-4 and 40-4) were given further consideration. The Enhanced Overflow Control Program has an additional 30-year NPV of $71 million when compared to the Baseline plan in the RWWFP. The implementation timing in this case has been fixed at 30 years. Figure 5.9 presents the annual average volumes of overflow associated with the Baseline and Enhanced Overflow Control alternatives. As can be seen, the annual overflow volume is reduced by over half. As importantly, the Enhanced Overflow Control Program provides additional control at 19 outfalls not addressed through the RWWFP. Annual Overflow Volume (m 3 ) 20,000,000 15,000,000 10,000,000 5,000,000 0 Baseline Growth No Control RWWFP Baseline Enhanced Overflow Control + RWWFP Figure 5.9 Enhanced Overflow Control Program Annual Volume Consequently, Plan 40-4 with B level (5 year WWTF and 10 year overflow implementation) current wastewater compliance, A level future wastewater nutrient compliance (10 year implementation), the Enhanced level of future overflow control (30 year implementation) and the composite asset renewal program is the Recommended IRP. Revision: 2012-10-29 Integrated Resource Plan 75 October 31 2012 Page 108 of 272
Halifax Water Integrated Resource Plan Recommended IRP and Analysis 6. RECOMMENDED IRP AND ANALYSIS 6.1 PURPOSE The purpose of this report section is to present an overview of the Recommended IRP including plan benefits. The section also provides analysis of the Recommended IRP with respect to end-of-period value, demand reduction and growth assumptions. All costs are presented as 30-Year NPV unless otherwise noted. 6.2 RECOMMENDED IRP OVERVIEW Based on the extensive analysis carried out through the IRP preparation a Recommended IRP was identified. The Recommended IRP components and timing are presented in Table 6.1. Table 6.1 Recommended IRP Components and Timing IRP Driver Compliance IRP Objective 1. Meet Current Nova Scotia Environment WWTF Permit to Operate. 2. Meet Current Nova Scotia Environment WSP Permit to Operate. 3. Meet Current Overflow Compliance. 4. Meet Future WWTF Compliance. 5. Meet Future Drinking Water Compliance. 6. Meet Future Overflow Compliance. 7. Meet Future Stormwater Quality Compliance. Recommended IRP Strategy • Five years to implement current WWTF compliance requirements. • Currently in full compliance. Continue current WQMP program and integrate into Water Master Plan. • Ten years to implement current overflow compliance requirements. • Twenty years to implement future WSER compliance requirements for three HHSP WWTFs. • Ten years to implement future nutrient compliance requirements for 10 WWTFs by upgrading 8 WWTFs (Wellington, Frame, Mill Cove, North Preston, Aerotech Middle Musquodoboit, Lockview- MacPherson Uplands Park) plus BLT (short-term upgrades) and consolidating Springfield Lake into Mill Cove WWTF and BLT (long-term consolidation) WWTFs into the Herring Cove WWTF as per the RWWFP. • Five years for Five-Year Capital Plan projects. • New program to control selected (19 non-growth and 9 growth already considered in RWWFP) overflows to a uniform level of 10 overflows per average year. • Program is in addition to the RWWFP, which will offset the impact of growth on overflows. • Thirty years to implement enhanced overflow control. • Three years for stormwater quality program development. Revision: 2012-10-29 Integrated Resource Plan 76 October 31 2012 Page 109 of 272
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Recommended Alternative Resource Pl
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Financial Model 40-4 Halifax Water
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Financial Model 40-4 2.512 (O&M) Lo
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Financial Model 40-4 1.028 Cavalier
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Financial Model 40-4 3.511 Stokil (
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Financial Model 40-4 2.075 Beaver C
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Financial Model 40-4 2.848 Storage
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Summary of Capital, Operational and
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Asset Renewal Costs Halifax Water I
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Asset Renewal Costs Stormwater Asse
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Statement Concerning Halifax Water
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Statement Concerning Halifax Water
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volume 1 - Halifax Regional Municipality

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