Resolution No. 4793 - Laserfiche WebLink

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BASIS OF PLANNING systemwide alternative, used to develop the 20-year project list, are to be comprehensive costs that/nclude all costs associated with the facilities in that alternative. 5.2.1 Capital Costs Order-of-magnitude capital costs for alternatives will be estimated ba.~sed on a combination of pubJLkshed cost literature, past vendor quotes, and past experience with similar-sized structures, equipment, and systems. The accuracy of this type of cost estimate typically ranges from -30 percent to +50 percent. The capital costs will be indexed to the January 2004 Engineering News-Record (ENR) Construction Cost Index (CCI) for the City of Seattle (7864). All capital costs include contingency, eng~eering, legal, and administrative costs. 5.2.2 Operations and tvlaintenance Costs O&M costs will be based on cu_rrent cost information for chemicals, power, and labor. Chemical costs are obtained from local distributors. Power costs are based on the current WPCF rate of $0.05 per kilowatt-hour. Labor costs for O&M are based on $68,000/FTE (Full Time Equivalent employee including fringe benefits). For many of the unit process and system alternative cost evaluation~s, the 20-year O&M costs will be insignificant relative to the capital cost. In other cases the O&M costs will be equal for the alternatives being considered. In these situations, the O&M costs are not required to be considered in the cost evaluation. 5.2.3 Present Worth Costs W-here a present worth cost was calculated £or alternatives, a present worth factor is to be applied to the O&M costs to convert the armual expenditures to present dollars. The present worth and annualized costs are to be based on an interest rate of 3 percent over the 20-year design life of the fac/lit-y, resulting in a series factor of 14.88. The total present worth cost of each alternative is then determined by adding the capital cost to the O&M present -worth cost. 5.2.4 Contingency Costs For all cost evaluations a 25 percent contingency is to be applied to the capital cost to account for unknowns and unidentified items. 5.2.5 Engineering, Legal, and Administrative Costs For all cost evaluations a 25 percent allowance for legal, adr~_inistrative, and engineer~g is to be applied to the capital and contingency costs to cover the project design and Ckvner legal and project administration. 5.3 Water Quality Impact 5.3.1 Background Data on Receiving Stream The WPCF discharges treated wastewater to the Willamette River at river mile 178 through a multi-port diffuser. The beneficial uses for this area of the Willamette River are listed in the OAKs and include public and private domestic water supply, industrial water supply, MWMC_5.~._REVS_VKS OOC 5-23