(A) All contractors shall supply a certificate or affidavit of insurance executed by a representative of a duly qualified insurance company evidencing that said insurance company has issued liability and property damage insurance policies covering activities of said contractor in amounts not less than the following schedule. Contractors doing work for the city, under a public contract, must also provide that the city is named as an additional insured.
(B) All certificates of insurance required herein shall state that 30 days’ written notice will be given to the city before the policy is cancelled or changed.
(C) All certificates of insurance shall be delivered to the city prior to the time that any operations are started.