
198 Environmental Impact Analysis
to achieve at least secondary treatment. This requirement was to reduce the
organic and solid waste load through biological treatment, as opposed to
primary treatment that achieves only minimal reduction of solids (Metcalf&
Eddy 1991). Initially, this requirement was accepted as an absolute impact
signicance criterion and if secondary treatment was achieved, there would
be no signicant adverse impact. But as the secondary treatment initiative
was implemented, it became apparent that secondary treatment alone was
Resource
category
Traf f ic
No impact
Insignif icant
impact
Signif icant impact
Housing
Infrastructure ...