Upon hearing the petition of the Health Officer and the response of the permittee at such public hearing, the Board may revoke the permit if the Board finds that any of the grounds set forth in Section 6-9.411 of this article exist or have occurred. The Board shall deny the petition for revocation if the Board finds that none of such grounds for revocation exist or have occurred. (§ 1, Ord. 858, eff. October 25, 1979)