What standard of review applies to the interpretation of the notice?

Respondents contend the proper standard of review is abuse of discretion, and argue that the "crux of this action involves the interpretation of the notice delivered to [appellant's] residence and mailed to him through U.S. mail." Respondents are incorrect. The "crux" of the issue on appeal is not interpretation of the notice; it is interpretation of the charter provision prescribing the manner in which notice must be given. Interpretation of a charter provision is a question of law. (Hall-Villareal v. City of Fresno (2011) 196 Cal.App.4th 24, 29.) We apply the undisputed facts to the charter and determine de novo whether service was made in the prescribed manner.