Wenger 72944 Especificações descarregar pdf (Página 184)

Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

5-30

station dimensions, and dewatering plan. The data served as the basis for

modifying a standard cost estimate for a pump plant of the same type. The

particular standard pump plant cost estimate was derived from the government

estimate of cost and the contract cost for a pump plan under construction or

recently completed.

5.3.12.4 RCC Cost Estimates

Construction cost estimates for RCC were produced by incorporating data

provided by designers. The data provided RCC quantity, wave break quantity,

and foundation treatment quantities. The cost estimates incorporate

assumptions regarding haul distances for processed material, material

processing, the mix design, and distribution and compaction of the RCC.

5.3.12.5 Cut-Off Wall

Cut-off wall estimates were developed from information provided about length

and depth. The developed cost estimate relies on assumptions about mix design,

excavation techniques, method of wall construction, and capping technique.

5.3.12.6 Other Structures

Other structures (overflow weir, spillways) had cost estimates developed from

MCACES cost data, recent material quotes, and historical data. The basis of the

cost estimates were general descriptions of the structure and required capacity.

5.3.12.7 Planning, Engineering and Design

Planning, engineering, and design costs were estimated by the various

engineering team members and provided for inclusion in the cost estimate.

5.3.12.8 Construction Management

Construction management costs were estimated by the Construction Operations

Division.

5.3.12.9 Contingency

A construction contingency of 25% of construction cost was used for all

construction other than the pump plant where a contingency of 15% of

construction cost was used. No statistical analysis of cost risk was performed.

The major factors influencing the construction contingency cost are:

• The estimate of rock quantity and usable material percentage: The rock

elevations were provided and were based on available borings data.

1 2 ... 179 180 181 182 183 184 185 186 187 188 189 ... 385 386

Wenger 72944 Especificações Página 184