Environmental Engineering Reference
In-Depth Information
Resource
category
Proposed
action
No
action
Altern. A
Altern. B
Built environment
No impact
Traffic
No to insignificant
impact
Housing
Insignificant
impact
Infrastructure
Significant impact
Water resources
Water chemistry
Seasonal flow
Biological resources
Special-status species
Wildlife
Aquatic biota
Cultural resources
Historic structures
Archeological sites
Recreation
FIGURE 5.12
Comparison of impacts using significance criteria among alternatives for hypothetical high-
way bypass project.
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
significance criterion and if secondary treatment was achieved, there would
be no significant adverse impact. But as the secondary treatment initiative
was implemented, it became apparent that secondary treatment alone was
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