(a) This chapter does not limit the authority of a local agency to adopt, implement, or enforce a local commercial solid waste recycling requirement that is more stringent or comprehensive than the requirements of this section or limit the authority of a local agency in a county with a population of less than 200,000 to require commercial solid waste recycling.
(b) This chapter does not modify, limit, or abrogate in any manner any of the following:
(1) A franchise granted or extended by a city, county, or other local government agency.
(2) A contract, license, or permit to collect solid waste previously granted or extended by a city, county, or other local government agency.
(3) The existing right of a business to sell or donate its recyclable materials.