In lieu of the special deposit required under Section 13.12.170, any applicant for the permit required by this chapter may make and maintain with the city a general deposit in a sum set by resolution of the city council or may file with the city clerk appropriate corporate surety bonds approved by the city attorney, covering all the work performed by such applicant for a period of one year subsequent to the last issuance of a permit, and by so doing shall not be required to accompany applications with special deposits or bonds; provided, however, that if the total estimated cost of excavation work covered by any single application would require a special deposit or bonds in a total sum in excess of the general bond amounts required, then such applicant depositing the general deposit or filing the bonds shall be required to increase the deposit or bond in an amount sufficient to bring the total thereof up to the total amount of the special deposit, which would otherwise be required at such time. (Ord. 1970 NCS §3 (part), 1994; Ord. 1369 NCS §2 (part), 1979.)