If charged with a violation of RCW 19.122.090, an equipment operator is deemed to have established an affirmative defense to such charges if:
(1) The equipment operator was provided an excavation confirmation code;
(2) The excavation was performed in an emergency situation;
(3) The equipment operator was provided a false confirmation code by an identifiable third party; or
(4) Notice of the excavation was not required under this chapter.