volume 1 - Halifax Regional Municipality
volume 1 - Halifax Regional Municipality volume 1 - Halifax Regional Municipality
Halifax Water Integrated Resource Plan Integrated Resource Plan Development and Evaluation The table includes the 30-Year NPV values as well as the colour coded environmental and public health impacts associated with each alternative resource plan. Table 5.9 shows an overall variation in 30 year NPVs of about $ 990 million (capital and O&M) with Plan 25-2 (with A level compliance timing and asset renewal and Enhanced Overflow Control) being the most expensive and Plan 15-2 (with C level compliance timing and asset renewal and Baseline overflow control) being the least expensive. In general, the plans with deferred compliance timing have higher relative levels of environmental and health impact. For example, comparing Plan 17.2 with Plan 18.2 (both A level asset renewal) shows that for a difference of $117 million in 30-year NPV, the relative environmental and health impact levels for Objectives 1, 3, and 4 are reduced from C level to A level. The Enhanced Overflow Control Program further reduces environmental impacts at an additional 30-year NPV cost of $71 million (Plans 22-2, 23-2, 24-2, 25-2, 28-2, 33-2, 34-2, 35-2 and 36-2). Asset Renewal The analysis already presented in Figures 5.3 indicated that asset renewal is the single most significant expenditure within the IRP. The approach to determining the appropriate level for asset renewal had to this point been based on a generalized level of asset performance designated A, B, C. The refined alternative resource plans in the next analysis step were assembled using the single composite asset renewal strategy as discussed in Volume 1 Appendix F. After eliminating redundant plans, the 10 refined alternative resource plans were prepared and are presented in the next section. 5.10 REFINED ALTERNATIVE RESOURCE PLAN DEVELOPMENT AND ANALYSIS The 10 refined alternative resource plans including the 30-year NPV values for the component asset renewal plan are presented in Table 5.10. Revision: 2012-10-29 Integrated Resource Plan 71 October 31 2012 Page 104 of 272
Halifax Water Integrated Resource Plan Integrated Resource Plan Development and Evaluation Table 5.10 Refined Alternative Resource Plans Plan No. 30 Yr. NPV $ million Current WWTF Objective 1 Current Overflow Objective 3 Future WWTF Nutrient Objective 4 Future Overflow Objective 6 & 13 15-3 $2,403 C C C 16-3 $2,520 A A A 37-3 $2,421 B B C Baseline 21-3 $2,458 B B B 38-3 $2,507 B B A 22-3 $2,474 C C C 23-3 $2,592 A A A 39-3 $2,492 B B C Enhanced 28-3 $2,529 B B B 40-3 $2,579 B B A Four additional plans (37-3, 38-3, 39-3 and 40-3) were added at this stage to allow for variation in future WWTF nutrient removal. Two each for the Baseline and Enhanced overflow control groups of plans. The impact of wastewater compliance timing and future level of overflow control was examined. The following observations resulted from the analysis: • The B level current compliance is perhaps the most realistic approach to the current WWTF compliance timing. Many of the compliance upgrade projects are already underway. Any new projects will require adequate time for engineering, design and construction. The five-year timeframe associated with B level current WWTF compliance is reasonable in this regard. • The overall program cost for Objective 3 current overflow compliance is $47.7 million 30-year NPV of which approximately $3.6 million 30-year NPV is already identified as part of the Five-Year Capital Plan. The remaining projects are largely associated with a number of storage facilities and nine outfall and pump station screening projects. Given the proposed additional expenditures, these projects would benefit from the comprehensive Wet Weather System Plan, discussed in Section 3 that would incorporate aspects of the RWWFP, the I/I reduction program and the current overflow control program into an integrated wet weather control program. In order to allow time for plan preparation and program development, Revision: 2012-10-29 Integrated Resource Plan 72 October 31 2012 Page 105 of 272
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<strong>Halifax</strong> Water Integrated Resource Plan<br />
Integrated Resource Plan Development and Evaluation<br />
Table 5.10<br />
Refined Alternative Resource Plans<br />
Plan No.<br />
30 Yr. NPV<br />
$ million<br />
Current<br />
WWTF<br />
Objective<br />
1<br />
Current<br />
Overflow<br />
Objective<br />
3<br />
Future<br />
WWTF<br />
Nutrient<br />
Objective<br />
4<br />
Future<br />
Overflow<br />
Objective<br />
6 & 13<br />
15-3 $2,403 C C C<br />
16-3 $2,520 A A A<br />
37-3 $2,421 B B C<br />
Baseline<br />
21-3 $2,458 B B B<br />
38-3 $2,507 B B A<br />
22-3 $2,474 C C C<br />
23-3 $2,592 A A A<br />
39-3 $2,492 B B C<br />
Enhanced<br />
28-3 $2,529 B B B<br />
40-3 $2,579 B B A<br />
Four additional plans (37-3, 38-3, 39-3 and 40-3) were added at this stage to allow for<br />
variation in future WWTF nutrient removal. Two each for the Baseline and Enhanced<br />
overflow control groups of plans.<br />
The impact of wastewater compliance timing and future level of overflow control was<br />
examined. The following observations resulted from the analysis:<br />
• The B level current compliance is perhaps the most realistic approach to the current<br />
WWTF compliance timing. Many of the compliance upgrade projects are already<br />
underway. Any new projects will require adequate time for engineering, design and<br />
construction. The five-year timeframe associated with B level current WWTF<br />
compliance is reasonable in this regard.<br />
• The overall program cost for Objective 3 current overflow compliance is $47.7<br />
million 30-year NPV of which approximately $3.6 million 30-year NPV is already<br />
identified as part of the Five-Year Capital Plan. The remaining projects are largely<br />
associated with a number of storage facilities and nine outfall and pump station<br />
screening projects. Given the proposed additional expenditures, these projects<br />
would benefit from the comprehensive Wet Weather System Plan, discussed in<br />
Section 3 that would incorporate aspects of the RWWFP, the I/I reduction program<br />
and the current overflow control program into an integrated wet weather control<br />
program. In order to allow time for plan preparation and program development,<br />
Revision: 2012-10-29 Integrated Resource Plan 72<br />
October 31 2012 Page 105 of 272
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