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Indian River County 1 Impact Fee Update Study <br />To calculate a corresponding trip rate for the new tiers it was necessary to rely on <br />comparative ratios. As an example, consider the $34,135 annual income category. First, it <br />was determined that the average annual household VMT for this income level is 17,787 <br />miles. This figure was then compared to the overall average annual VMT per household in <br />the U.S. and normalized to the average of the $62,563 (24,069 miles) category to derive a <br />ratio of 0.740. Next, the normalized ratio was applied to the daily VMT for the average <br />single family housing unit size (Less than 1,000 sf) to generate a daily VMT of 38.26 for the <br />new tier, as shown in Table B-5. This daily VMT figure was then divided by the proposed <br />assessable trip length of 6.62 miles to obtain a typical trip rate of 5.78 trips per day. <br />Table B-5 <br />Trip Generation Rate by Single Family Land Use Tier <br />Estimation of Trip Rate by Assessable <br />Tier Trip Rate(1) Trip Length(2) <br />Ratio to <br />Mean(4) <br />Single Family (Detached) <br />Less than 1,000 sf <br />5.78 <br />6.62 <br />38.26 <br />0.740 <br />1,000 to 1,499 sf <br />6.52 <br />6.62 <br />43.17 <br />0.835 <br />1,500 to 2,499 sf <br />7.81 <br />6.62 <br />51.70 <br />1.000 <br />2,500 sf or larger <br />9.20 <br />6.62 <br />60.90 <br />1.178 <br />(11 Daily VMT (Item 31 divided by assessable trip length (Item 21 for each tiered single <br />family land use category <br />(2) Source: Table B-2 <br />(3) Ratio to the mean (Item 4) divided by the total daily VMT for the 1,500 to 2,499 sf tier <br />for each tiered sf single family land use category <br />(4) Source: Table B-4 <br />Table B-6 illustrates the impact that the incorporation of the trip generation rate tiers for <br />the single family (detached) land use have on the County's calculated impact fee schedule. <br />Table B-6 <br />Net Impact Fee by Single Family Land Use Tier <br />Impact of Tiering on Fee <br />Schedule <br />(l) Assessable Fee(2) Trip Rate Trip Length Daily VMT Net Fee <br />Single Family (Detached) <br />Less than 1,000 sf <br />5.78 <br />6.62 <br />38.26 <br />$3,149 <br />1,000 to 1,499 sf <br />6.52 <br />6.62 <br />43.17 <br />$3,554 <br />1,500 to 2,499 sf <br />7.81 <br />6.62 <br />51.70 <br />$4,248 <br />2,500 sf or larger <br />9.20 <br />6.62 <br />60.90 <br />$5,004 <br />(1) Source: Table B-5, Item 1 <br />(2) Source: Appendix E, Table E-1 <br />Tindale -Oliver & Associates, Inc. <br />June 2014 <br />Indian River County <br />B-3 Impact Fee Update Study <br />2,DS <br />