volume 1 - Halifax Regional Municipality
volume 1 - Halifax Regional Municipality
volume 1 - Halifax Regional Municipality
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<strong>Halifax</strong> Water Integrated Resource Plan<br />
Integrated Resource Plan Development and Evaluation<br />
The table includes the 30-Year NPV values as well as the colour coded environmental<br />
and public health impacts associated with each alternative resource plan.<br />
Table 5.9 shows an overall variation in 30 year NPVs of about $ 990 million (capital and<br />
O&M) with Plan 25-2 (with A level compliance timing and asset renewal and Enhanced<br />
Overflow Control) being the most expensive and Plan 15-2 (with C level compliance<br />
timing and asset renewal and Baseline overflow control) being the least expensive. In<br />
general, the plans with deferred compliance timing have higher relative levels of<br />
environmental and health impact. For example, comparing Plan 17.2 with Plan 18.2<br />
(both A level asset renewal) shows that for a difference of $117 million in 30-year NPV,<br />
the relative environmental and health impact levels for Objectives 1, 3, and 4 are<br />
reduced from C level to A level. The Enhanced Overflow Control Program further<br />
reduces environmental impacts at an additional 30-year NPV cost of $71 million (Plans<br />
22-2, 23-2, 24-2, 25-2, 28-2, 33-2, 34-2, 35-2 and 36-2).<br />
Asset Renewal<br />
The analysis already presented in Figures 5.3 indicated that asset renewal is the single<br />
most significant expenditure within the IRP. The approach to determining the<br />
appropriate level for asset renewal had to this point been based on a generalized level<br />
of asset performance designated A, B, C.<br />
The refined alternative resource plans in the next analysis step were assembled using<br />
the single composite asset renewal strategy as discussed in Volume 1 Appendix F. After<br />
eliminating redundant plans, the 10 refined alternative resource plans were prepared<br />
and are presented in the next section.<br />
5.10 REFINED ALTERNATIVE RESOURCE PLAN DEVELOPMENT AND ANALYSIS<br />
The 10 refined alternative resource plans including the 30-year NPV values for the<br />
component asset renewal plan are presented in Table 5.10.<br />
Revision: 2012-10-29 Integrated Resource Plan 71<br />
October 31 2012 Page 104 of 272
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