volume 1 - Halifax Regional Municipality

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<strong>Halifax</strong> Water Integrated Resource Plan Integrated Resource Plan Development and Evaluation the current overflow control program at the B Level corresponding to 10 years was felt to be reasonable. • The difference in 30-year NPV based on the Baseline and Enhanced Overflow Control Programs (e.g. Plan 15-3 versus Plan 22-3) was $71 million. The Enhanced Overflow Control Program does further reduce environmental impacts for the additional cost. At this stage in the alternative resource plan development and analysis, the 30-year NPV is similar for all plans. The differences largely lie in the level of environmental and public health impact. Based on the analysis presented above, it was decided to short-list four of the refined plans. The analysis of the refined plans is discussed in the next section. 5.11 SHORT-LIST PLAN ANALYSIS The four short-listed alternative resource plans are presented in Table 5.11. The NPV of cost difference between the most and least is $121 million over the 30-year period. This difference is comprised of approximately $71 million difference due to the Enhanced Overflow Control Program and a $50 million difference due to the compliance timing for the Enhanced Nutrient Removal Program. Table 5.11 Short-Listed Alternative Resource Plans Plan No. 30 Yr. NPV $million Current WWTF Current Overflow Future WWTF Nutrient Future Overflow 21-4 $2,458 B B B 38-4 $2,507 B B A 28-4 $2,529 B B B 40-4 $2,579 B B A Baseline Enhanced The timing of the current WWTF compliance program and the current overflow control program has already been discussed under the refined plan analysis. The remaining decisions in connection with the short-listed plans are associated with the timing of nutrient control implementation and the level of future overflow control. As far as nutrient control timing is concerned, there is a $50 million cost increase for a program with a 10-year timetable compared to a program with a 20-year timetable. The expected benefits of the Enhanced Nutrient Removal Program by way of reductions in N and P loadings are shown in Figures 5.7 and 5.8. For illustrative purposes, the BLT and Mill Cove plants were not included in this analysis but would also have substantially reduced loadings with the Enhanced Nutrient Control Program. It should also be noted that operating permits for the WWTFs currently do not have total N limits. Revision: 2012-10-29 Integrated Resource Plan 73 October 31 2012 Page 106 of 272
<strong>Halifax</strong> Water Integrated Resource Plan Integrated Resource Plan Development and Evaluation Figure 5.7 Eight Community WWTF Total P Reduction Figure 5.8 Eight Community WWTF Total N Reduction Revision: 2012-10-29 Integrated Resource Plan 74 October 31 2012 Page 107 of 272
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VOLUME 1: INTEGRATED RESOURCE PLAN
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Halifax Water Integrated Resource P
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FINAL 1 2 3 4 5 6 7 10 13 16 17 18
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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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