The prohibition set forth in RMC 6.30.030 shall not apply to any person in the business of solid waste collection when such person is performing services under the current term of a written contract that existed on or before September 2, 1997, to the extent that servicing such contract requires the use of any public street, highway, or right-of-way in the City. Any person claiming to be exempt under this section shall bear the burden of proving that he or she is entitled to rely upon the exemption and shall, upon demand from the Public Works Director, furnish copies of any such contract to the City. (Ord. 1952 § 1, 1997).