CEMP-E/CECW-E
EI 01D010
1 September 1997
Excavation time per load may be limited to pumping
15-7. Monthly Costs
to overflow only, due to environmental concerns, or
may be continued beyond overflow to obtain an
a. The monthly costs for all types of dredges are
economic or a maximum load. Transport time may be
based on labor, equipment, and other monthly costs.
affected by items such as ship traffic, weather,
distance, and tides. Disposal consists of either gravity
b. Labor costs consist of wages, fringe benefits,
dumping or pumping out the material. The time
taxes, and insurance. Labor consists of personnel
required to gravity dump the material in open water
necessary for the operation of the dredge, attendant
depends on the type of material and the dredge. If the
plant and equipment with required supervision, and
material is pumped out, the time becomes a function of
shore personnel used for the dredging work.
pump size, discharge diameter, and pipeline length,
similar to a pipeline dredge. The volume per load
c. Equipment costs consist of ownership costs
depends on the hopper size, the dredge's load carrying
and operating costs. Costs for dredge plant will be
capability, type and characteristics of material,
based on historical data. In the absence of valid
distance to the placement area, and environmental
historical data, the CEDEP will be the basis for cost
concerns.
of dredge plant. Other equipment costs shall be
obtained from EP 1110-1-8, Equipment Ownership
(2) The effective time is affected by items
Schedule.
such as vessel traffic, minor operating repairs, and
refueling.
d. Indirect costs are to be determined by the cost
engineer. In addition, such things as surveys,
d. Mechanical Dredging. To determine
environmental monitoring, and navigation aids may
mechanical dredge production, the cost engineer must
need to be included.
calculate both a dredge excavation cycle time and a
haul cycle time. Effective time is considered
15-8. Fixed Costs
separately for each cycle. The longer of these two
cycle times determines the production rate. When the
The fixed costs for all types of dredges are project
haul cycle time is longer than the dredge excavation
specific. They are one-time costs for the project that
time, the dredge is sitting idle while waiting on scows.
are not included elsewhere.
Normally, when this occurs, the number of scows
required is increased to achieve the most efficient cost.
15-9. Pay Items
(1) The dredge excavation cycle consists of
excavating the material and loading scows. This cycle
estimate for this item consists of the following:
is affected by items such as bucket size, type of
material, operator efficiency, and size of dredge.
(1) Preparing dredge and attendant plant for
Effective time is affected by items such as weather,
transfer. Costs incurred may consist of such items as
vessel traffic, repositioning of dredge, and minor
preparing laid-up equipment for use, re-inspection,
operating repairs.
and stocking equipment and supplies.
(2) The haul cycle consists of transport time
(2) Mobilization transfer costs. This item
and disposal time. This cycle is affected by the size,
includes the cost to move all plant and equipment and
type, and number of scows available, as well as the
the return of the tug or towing vessels(s).
size, type, and number of towing vessels available.
Effective time is affected by items such as weather,
(3) Preparing the plant for work. This item
vessel traffic, and minor operating repairs.
includes preparation costs which are incurred to set up
the equipment to start work, assemble, and place
e. Specialty Dredging. The cost engineer will
discharge line and boosters.
have to investigate in detail the method, equipment,
and expected production on a case-by-case basis.
15-4
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