Whenever spur tracks are to be located in the sidewalk area of any street or in any sidewalk area which is to be abolished for the purpose of so locating said spur tracks, the application for the spur track permit shall contain the following agreement:
"I, ____________ hereby warrant, promise, covenant, and agree to assume the defense of, indemnify, save and keep harmless the City and County of San Francisco, the Director of Public Works and their officers and employees, from any and all claims, losses, damages, injuries and liabilities of every kind, nature and description, regardless of responsibility for negligence, whether involving injury to person or property, both real and personal, and whether directly or indirectly arising from the creation, construction, location, condition and maintenance of the spur tracks to be authorized under the permit herein applied for or by virtue of any abolition of sidewalk area herein contemplated, and whether for impairment of the rights of abutting owners of ingress, egress, and accessibility, or otherwise."