If the actual cost of engineering review are less than the estimated costs, any excess funds in the escrow account shall be returned to the project applicant. If the actual costs exceed the estimated costs, the project applicant shall pay the additional costs within thirty (30) days of submission of a bill for costs from the Town. After thirty (30) days, such additional costs shall be charged to the applicant at a rate of one and one-half percent (1.5%) per month. (Prior code 15.40.030; Ord. 1288 §1, 2008; Ord. 1296 §1, 2008)