1 September 1997
e. Dredging time. "Dredging time" is
PREPARATION OF DREDGE COST
"Operating time" plus "Allowable downtime."
f. Effective working time. "Effective working
time" is time during the dredging operation when
actual production is taking place, such as material
a. This chapter provides guidance for estimating
moving through the pipeline. "Effective working
the dredging portion of a project.
time" is chargeable to the cost of work.
b. Associated work items, such as clearing and
g. Gross production cost. "Gross production
grubbing, dike or weir construction, disposal area
cost" is the cost of dredging the gross volume. It is
operation and maintenance, drilling and blasting, and
determined by multiplying the total monthly cost by
environmental protection, are not included and should
the dredging time in months and adding the fixed and
be estimated separately in accordance with other parts
of this manual.
h. Gross volume. "Gross volume" is the "Net
c. Each cost engineer should be aware of various
pay volume" plus the "Nonpay volume."
techniques that have proven to produce the most
accurate results for specific projects in their
i. Lost time. "Lost time" is downtime, which is
not operational, normally due to a lack of required
crew, major repairs and alterations, dry-docking,
d. Estimates will be prepared in accordance with
cessation, and collisions. "Lost time" is not
the software program entitled, "Cost Engineering
chargeable to the cost of work.
Dredge Estimating Programs (CEDEP)" and will con-
tain a narrative documenting reasons for decisions and
j. Maximum pay volume. "Maximum pay
selections made by the cost engineer. Figure 15-1,
volume" is the sum of the "Required volume" and the
Dredge Prism, indicates project dimensions and quan-
"Allowable over depth volume."
tity of material considerations to determine pay items.
k. Net pay volume. "Net pay volume" is the
"Maximum pay volume" minus the "Allowable over
depth not dredged."
a. Allowable down time. "Allowable down time"
is "Non-effective working time" (see Noneffective
l. Non-allowable downtime. "Nonallowable
downtime " is " Lost time" (See "Lost Time").
b. Allowable over depth not dredged.
m. Noneffective working time. "Noneffective
"Allowable over depth not dredged" is the volume of
working time" is time during the dredging operation
"Allowable over depth volume" that is estimated and
when the dredge is operational but no production is
will not be dredged.
taking place, such as making changes to pipelines,
cleaning trash from the suction head, minor operating
c. Allowable over depth volume. "Allowable
repairs, and moving between locations. "Noneffective
over depth volume" is the volume of material between
working time" is chargeable to the cost of work.
the required pay prism and the maximum pay prism.
n. Nonpay volume.
d. CEDEP. CEDEP is the acronym for the
three Cost Engineering Dredge Estimating Programs
(1) "Nonpay volume" based on excavation
measurement is the volume of material estimated to be
programs developed are Pipeline; Mechanical CEDEP;
removed from outside the maximum pay prism.
and Hopper CEDEP.