Change orders in contracts shall be approved under the same
guidelines as specified in the purchasing rules Section if the proposed
changes were initiated by the staff or are in response to conditions
unforeseen at the time the contract was awarded, and the total cost
of said change orders does not exceed the spending limits outlined
in the purchasing rules Section and the approval does not materially
alter the purpose of the contract. All change orders over ten thousand
dollars ($10,000.00) or over ten percent (10%) of the original contract
amount shall be approved by the Board of Aldermen prior to implementation
of the change.