volume 1 - Halifax Regional Municipality

Halifax Water Integrated Resource Plan
Integrated Resource Plan Development and Evaluation
procedures are presented in Volume 3 Appendix C. All capital costs presented for
the RWWFP have been harmonized with regard to costing procedure used by the
IRP. All capital costs are presented in $2012 using an ENRCC Index value of 9200.
• Additional (change in) O&M costs were developed using the procedures described
in Volume 3 Appendices B and C. The costs account for labour, energy, and
chemicals as well as such consumables as UV bulbs and membrane filter cartridges.
Additional O&M costs for upgrade/expansion projects were started the year after
the project was implemented.
• All programs/projects and O&M costs were allocated to one or more IRP objectives.
The cost split among objectives was based on best professional judgment. The splits
are recorded in the financial models presented in Volume 3 Appendix F.
• The Enhanced Overflow Control Program was allocated in total to Objective 6. The
asset renewal costs arising from the asset renewal modeling were allocated to
Objective 8. These program costs incorporated the Halifax Water Five-Year Capital
Plan specific asset renewal projects. The RWWFP costs were allocated primarily to
Objective 13 reflecting the need to offset the impacts of growth on the existing
wastewater system. Some RWWFP costs were however allocated to Objectives 6
and 14.
5.7 PLAN FORMULATION AND EVALAUTION OVERVIEW
Considering the key drivers - regulatory compliance, asset renewal and growth - an
initial set of 28 alternative resource plans were developed to meet the water,
wastewater, and stormwater service needs of Halifax Water's service areas through to
the year 2043. The initial plans reflected variations on the timing and nature of
wastewater system compliance; levels of asset renewal investment, and the degree of
overflow control.
The initial plans were evaluated in terms of their 30-year net present value (NPV) cost,
their compliance timing, and their potential environmental and public health impacts.
Based on this analysis, 18 intermediate plans worthy of further consideration were
identified. Using a single composite asset renewal strategy, redundant intermediate
plans were eliminated and 10 refined plans were developed. The 30-year NPV at this
stage in the alternative resource plan development and analysis was similar for all
resource plans. Based on environmental and public health impacts the 10 refined plans
were further reduced to 4 short-list plans. A recommended plan was selected from the 4
short-list plans based on the benefits of nutrient control and the enhanced overflow
control program.
Revision: 2012-10-29 Integrated Resource Plan 57
October 31 2012 Page 90 of 272