The city infrastructure maintenance fee provided for in this chapter shall become effective and imposed on the first day of the month not less than ninety (90) days after the city provides written notice by certified mail to each telecommunications retailer with whom the city has an existing franchise, license, or similar agreement, that the city waives all compensation under such existing franchise, license, or similar agreement during such time as the fee is subject to being lawfully imposed and collected by the retailer and remitted to the city. The infrastructure maintenance fee shall apply to gross charges billed on or after the effective date as established in the preceding sentence. (Ord. 97-O-54, 12-16-1997)