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2020 Eugene Wastewater Master Plan Chapter 6: Basis of Cost Estimates 46 Chapter 6 - Basis of Cost Estimates PURPOSE This chapter provides estimated construction costs for wastewater lines, wastewater pump stations, and pressure lines. GENERAL The estimated costs presented in this chapter are primarily for development of long-range financial plans. Major new interceptors, trunk wastewaters lines, pump stations, and pressure lines that may be constructed during the next 20 years are described in Chapter 7. This chapter shows the basic unit prices used to estimate the construction costs for these future wastewater projects. WASTEWATER CONSTRUCTION COSTS Wastewater construction cost estimates are based on the 1998 Local Wastewater System Development Study completed by CH2MHill and have been adjusted to an Engineering News-Record (ENR) cost index of 11281, which was the average adjustment for 2019. This method was verified by comparing adjusted estimates to values from more recent cost estimating software. The estimated costs per foot are shown for pipes from 6-inch through 72-inch diameters and for trench depths in 5-foot increments. The costs are estimated for two typical construction situations as shown in Table 6-1 and Table 6-2. The costs include a complete construction package for the main wastewater line, including manholes, excavation, pipe bedding, pipe materials, pipe laying, pipe zone backfill, appropriate trench backfill, air-pressure testing, TV inspection, and pavement removal and repair in the trench area where required. The tables show costs for projects of average construction difficulty. When special conditions exist, such as high ground water, unstable trench, difficult traffic control, etc., costs should be increased. Costs for building service connection lines and other special features, such as pavement overlays beyond the trench area, also must be added if a more complete project estimate is needed.