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(1) "Significant" as used in SEPA means a reasonable likelihood of more than a moderate adverse impact on environmental quality.
(2) Significance involves context and intensity (WAC 197-11-330) and does not lend itself to a formula or quantifiable test. The context may vary with the physical setting. Intensity depends on the magnitude and duration of an impact.
The severity of an impact should be weighed along with the likelihood of its occurrence. An impact may be significant if its chance of occurrence is not great, but the resulting environmental impact would be severe if it occurred.
(3) WAC 197-11-330 specifies a process, including criteria and procedures, for determining whether a proposal is likely to have a significant adverse environmental impact.
[Statutory Authority: RCW 43.21C.110. WSR 84-05-020 (Order DE 83-39), ยง 197-11-794, filed 2/10/84, effective 4/4/84.]