Blackburn Wastewater Treatment Plant Upgrade Study

Section 5.0- Evaluation of Options
Effect on Surrounding Area
The potential for degradation of the surrounding area (e.g. the receiving
water quality, or transfer pipeline routes) under normal and upset operating
conditions.
Odonr PotentiallAir Emission
The potential for malodorous gas release from a system under normal and
upset conditions.
VisuaVNoiselTraffic
A measure of the visual obtrusiveness of the system or facility, the
magnitude of noise generation and the amount of buck traffic associated
with the system.
The cost criteria for the various options have been developed within this
document. In cases where there is no significant difference in the life cycle
costs of two options, the decision regarding the preferred option must be based
on the non-economic criteria listed above. During the Decision Workshop, the
key project elements were evaluated using both the economic and noneconomic
criteria by the technical and administrative personnel from the City,
a representative from MOE and key project team members from the Reid
Crowther team.
5.2 EVALUATION TECHNIQUES
5.2.1 Introduction
There are a variety of techniques that can be used to assist decision-makers
with selacting options. The most usefd technique nil1 depend on the nature
and magnitude of the trade-offs identified and the stakeholders involved.
There are a variety of recognized technical methods available, which vaty
considerably in complexity and include:
Holistic assessment
Options are ranked based on structural information, but no formal decision
model. Trade-offs are implicit using this technique which could be
considered to be too judgmental for this project.
Pair-wise comparison
Each of the criteria b m every option is paired with all other options and
individually evaluated or scored based on which perfoms best.