Before any governmental action may be taken on a project which may have a significant effect on the environment, a public hearing shall be held on the environmental impact report for the project and on any supplemental environmental impact report for the project which differs significantly from the original environmental impact report. After the city council had prepared a preliminary draft of the environmental impact report, it shall hold a public hearing in regard to the project. Notice of the time and place of the hearing shall be published at least once in a newspaper published and circulated in the city, the first publication of which shall be at least four days prior to the time set for the hearing. Any environmental impact report to be considered shall be available in the City Hall for public inspection from the time of publication until the time of the hearing. At the time and place set for the hearing, evidence on the potential effect of the project on its proposed environment shall be received. The hearing may be continued from time to time. No decision on the environmental impact of the project or on the proposed governmental action is necessary at such a hearing. (Ord. 122 § 5.5, 1973)