(1) The term "measurable expenditure" as used in RCW 42.52.180 (2)(b) shall mean an expenditure or consumption of public resources having more than a de minimis cost and value.

(2) As used herein, the term "de minimis cost and value" shall refer to a cost and/or value of the actual use of public resources that is sufficiently small to be reasonably disregarded as negligible or trifling.