For all proposals for which the city is the lead agency, the responsible official shall make the threshold determination, supervise scoping and preparation of any required Environmental Impact Statement, and perform any other functions assigned to the “lead agency” or “responsible official” by those sections of the SEPA rules that were adopted by reference in WAC 173-806-020 (Ord. 1192 §20, 2002; Ord. 701 §2 (part), 1984).