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 />
Table 5.7 shows the colour coding used to describe the relative environmental and<br />
health impacts of the plan variations associated with wastewater compliance.<br />
Table 5.7<br />
Relative Environmental or Health Impact<br />
Relative<br />
Impact<br />
Level<br />
Elevated<br />
Medium<br />
Low<br />
Colour<br />
Code<br />
Comment<br />
Relatively elevated impact of implementation of WWTF or overflow compliance measures<br />
for IRP Objectives 1,3,4 with C timing<br />
Relatively elevated impact of Modified RWWFP (Objectives 4,6,13) which will maintain<br />
discharge (upgraded) to the limited receiving waters associated with the BLT (Nine Mile<br />
River) and Springfield Lake (Lisle Lake) WWTFs<br />
Relatively elevated impact of Baseline overflow control program associated with RWWFP<br />
which controls only the growth impacted overflows to approximately the current level<br />
Relatively moderate impact of implementation of WWTF or overflow compliance measures<br />
for IRP Objectives 1,3,4 with B timing<br />
Relatively low impact of implementation of WWTF or overflow compliance measures for<br />
IRP Objectives 1,3,4 with A timing<br />
Relatively low impact of RWWFP (Objectives 4,6,13) which will consolidate the BLT (Nine<br />
Mile River) and Springfield Lake (Lisle Lake) WWTF discharges and redirect them to salt<br />
water based receivers<br />
Relatively low impact of Enhanced Overflow Control Program which adds overflow controls<br />
including those addressed in the RWWFP to achieve 10 overflows per year in an average<br />
rainfall year at selected overflow locations.<br />
Table 5.8 shows the relative impacts for the 28 initial plans. In general, the plans with<br />
deferred compliance timing and elevated relative levels of environmental and health<br />
impact were lower cost for a given level of asset renewal. For example, comparing Plan<br />
3-1 with Plan 4-1 (both A level asset renewal) shows that for $169 million in 30-year<br />
NPV, the relative environmental and health impact levels for Objectives 1, 3, and 4 are<br />
improved as the plans move from C level to A level.<br />
Revision: 2012-10-29 Integrated Resource Plan 68<br />
October 31 2012 Page 101 of 272
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