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CHAPTER FOUR: PLAN METHODOLOGY <br />PW Finance updated historic cost records from the 2018 effort. The cost look back includes <br />years 2011 — 2020. Annual budget line items (BARS Codes) were queried and compiled by each <br />year to inform cost treads. A companion effort was conducted for all revenue sources available <br />in state law in 2018. PW Equipment, Rental and Replacement vehicles are evaluated for <br />probable replacement during the ten-year analysis period (2022 — 2032). Bridge files are <br />evaluated for two classes of county owned bridges: National Bridge Inventory System (NBIS) <br />bridges (over twenty feet in length) and non-NBIS bridges (under twenty feet in length). Bridge <br />sufficiency ratings (an indicator of bridge health) were reviewed and any raring below 50 was <br />noted. This rating system is prescribed by the federal government and used by the County in <br />annual bridge evaluations. In addition, bridge files were evaluated for bridge deck coding below <br />(5) five (an indicator of the degree of deck deterioration — again as prescribed by the National <br />Bridge Inspection System). Roads are evaluated based on current PRESERVATION standards <br />(chip sealed every seven years). An assumed service level of today's current standard utilizes <br />the existing PRESERVATION standard for cost forecasting (70 miles of chip seal a year). As an <br />alternative to continuing the service level of PRESERVATION, PW evaluated local roads on the <br />existing network for removal with the understanding that gravel road maintenance costs will <br />likely increase in the final three years of the ten-year TAMP. The inventory reduction is an <br />iterative process matching available revenue with cost forecast during the evaluation period <br />(2022 — 2032). The reduction is necessary for allowing replacement of critical assets related to <br />road classification and/or critical bridge crossing. Reducing maintenance of local roadways over <br />a ten-year period is forecast to retain approximately $7.8 million in Road Fund reserves. It is <br />anticipated that the Board of County Commissioners will determine the final list of asset <br />reductions for both bridge, road, and equipment necessary to provide balanced PW budgets for <br />the next ten years of operation assuming an adoption of level of service <br />REHABILITATION/REPLACEMENT. <br />CHAPTER FIVE: EXPENSES <br />Expense Forecasting <br />Kittitas County PW is a certified Washington State Department of Transportation (WSDOT) local <br />program agency. This certification allows PW to manage federal aid projects without reliance on <br />the state. WSDOT estimates bridge replacement projects by assigning a value to the square footage <br />of the bridge structure. PW bid and purchasing history indicates that a value of $330 per square <br />foot is a reasonable current value. This price does not include all project costs. Including all <br />project costs, our cost history indicates an average square footage price of $930 is more <br />appropriate. For this ten-year plan, we utilize the $930 per square foot value to best forecast <br />impacts to rate payers. <br />Oil prices have been particularly volatile during the 2020-2021 pandemic. Adding to the challenge <br />of forecasting crude oil prices for a ten-year period, is the reality of supply and demand. The <br />Kittitas County Department of Public Works 2022-2032 Transportation Asset Management Plan <br />Janaury 2022: Page 6 <br />