In the event a rupture, break, or opening occurs on the surface or production casing, the permittee, the operator, and the drilling contractor shall each take action to repair it, and shall each report the incident to the City promptly. Actual repairs and actual reporting to the City by one shall be considered adequate; however, a mistaken belief held in good faith that others have performed as required does not relieve the permittee, the operator, or the drilling contractor of their independent obligations, nor does it provide a defense to a prosecution for violation of this section. (1994 Code § 23.5-31)