(a) In addition to its authority under Section 41820, the board may, after a public hearing, grant a time extension from the diversion requirements of Section 41780 to a city if both of the following conditions exist:

1. (1) The city was incorporated pursuant to Division 3 (commencing with Section 56000) of Title 5 of the Government Code after January 1, 1990, and before January 1, 2001.
2. (2) The county within which the city is located did not include provisions in its franchises that ensured that the now incorporated area would comply with the diversion requirements of Section 41780.

(b) The board may authorize a city that meets the requirements of subdivision (a) to submit a source reduction and recycling element that includes an implementation schedule that shows both of the following:

1. (1) The city shall divert 25 percent of its estimated generation amount of solid waste from landfill or transformation facilities within three years from the date on which the source reduction and recycling element is due pursuant to subdivision (b) of Section 41791.5, through source reduction, recycling, and composting activities.
2. (2) The city shall divert 50 percent of its estimated generation amount of solid waste from landfill or transformation facilities within eight years from the date on which the source reduction and recycling element is due pursuant to subdivision (b) of Section 41791.5, through source reduction, recycling, and composting activities.