Any improvement security required under the provisions of this chapter shall be in a form authorized by the Subdivision Map Act. If the improvement security is other than a bond or bonds furnished by duly authorized corporate surety, an additional amount shall be included as determined by the City Council as necessary to cover the cost and reasonable expenses and fees, including reasonable attorneys' fees, which may be incurred by the City in successfully enforcing the obligation secured.
   The improvement security shall also secure the faithful performance of any changes or alterations in the work to the extent that such changes or alterations do not exceed ten percent of the original estimated cost of the improvement. (Ord. 3759 § 2 (part); August 30, 1978.)