Starting up; early stages - Introduction to Environmental Impact Assessment - page 115

Environmental
componant

Criterion TOC Alt X Alt Y Alt Z

Imp Imp>
TOC?

Imp Imp>
TOC?

Imp Imp>

TOC?

Air quality emission

standards

1 2C yes 1C no 2C yes

Economics benefit:cost

ratio

1:1 3:1 no 4:1 no 2:1 no

Endangered species no. pairs of
spotted owls

35 50D no 35 D no 20 D yes

Water quality water quality

standards

1 1C no 2C yes 2C yes

Recreation no. camping

sites

5000 2800C yes 5000C no 3500C yes

Figure 4.8 Part of a threshold-of-
concern (TOC) checklist. (Adapted
from Sassaman 1981.)

Environmental
component

P roject action

Construction Operation

Utilities Residential

and commercial
buildings

Residential
buildings

Commercial
buildings

Parks and
open spaces

Soil and geology x x

Flora x x x

Fauna x x x

Air quality x

Water quality x x x

Population density x x

Employment x x

Traffic x x x x

Housing x

Community structure x x x

Figure 4.9 Part of a simple matrix.

project (e.g. construction, operation, decommissioning, buildings, access road) have
different impacts. The action likely to have an impact on an environmental component is
identified by placing a cross in the appropriate cell. Figure 4-9 shows an example of a