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A. The director shall calculate the transportation impact fees as set forth in BMC 17.045.070, subject to the provisions of this chapter.

B. In determining the proportionate share, the method of calculating impact fees shall incorporate, among other things, the following:

1. The cost of public streets and roads necessitated by new development;

2. An adjustment to the cost of the public streets and roadways for past or future payments made or reasonably anticipated to be made by new development to pay for particular system improvements in the form of user fees, debt service payments, taxes, or other payments earmarked for or proratable to the particular system improvement;

3. The availability of other means of funding public street and roadway improvements;

4. The cost of existing public street and roadway improvements; and

5. The methods by which public street and roadway improvements were financed.

C. A credit, not to exceed the impact fee otherwise payable, shall be provided for the value of any dedication of land for, improvement to, or new construction of any system improvements provided by the developer to facilities that are identified in the capital facilities plan and on the project list (BMC 17.045.008) and that are required by the city as a condition of approving the development activity. The determination of “value” shall be consistent with the assumptions and methodology used by the city in estimating the capital improvement costs.

D. The director may adjust the standard impact fee at the time the fee is imposed to consider unusual circumstances in specific cases to ensure that impact fees are imposed fairly.

E. The amount of fee to be imposed on a particular development may be adjusted by the director giving consideration to studies and other data available to the director or submitted by the developer demonstrating to the satisfaction of the director that an adjustment should be made in order to carry out the purposes of this chapter. Independent fee calculations for traffic impact fees shall use the same formulas and methodology used to establish the impact fees in this title and shall be limited to adjustments in trip generation rates used in the rate study, and shall not include travel demand forecasts, trip distribution, costs of street projects, or cost allocation procedures. Independent fee calculations for land uses not included on the impact fee schedule shall document trip generation rates, adjustments for pass-by trips and trip length adjustments applied to the cost per p.m. peak hour trip end documented in the most recent rate study. The director may develop administrative guidelines and technical procedures regarding the independent fee calculations.

F. The impact fee shall provide for system improvement costs previously incurred by the city to the extent that new growth and development will be served by the previously constructed improvements; provided, that such fees shall not be imposed to make up for any system improvement deficiencies.

G. Cost Indexing. At the end of any 12-month period in which the impact fees are not updated, the director may adjust the traffic impact fee schedule by the same amount as the percentage change in the Seattle-Tacoma area Consumer Price Index for the most recent 12-month period prior to the date of the adjustment. (Ord. 2166 § 1 (Exh. A), 2015; Ord. 2014 § 1 (Exh. A), 2009; Ord. 1877 § 1, 2002; Ord. 1658 § 1, 1996).