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1
EXECUTIVE SUMMARY
PROJECT: Chicago Ditch Dam Rehabilitation
General:
The purpose of this value study was to examine the subject project to
identify alternatives that had the potential to enhance the value of the
proposed project for the Fish and Wildlife Service and the customers they
serve.
Through traditional Value Method procedures, the Value Study Team evaluated
the activity. The team took the public issues, activities, funding
authorization, and available resources (time, money, equipment, etc.) into
consideration in its activities. The team generated seven concepts that would
add value to the project. The value study also generated several value added
features to the concept plans. (Value added features are defined as
attributes that the team believes will improve the final product in non-
monetary or hard to quantify ways, e.g., time, quality, and safety. Increased
initial or Life-Cycle Costs (LCC), if any, are expected to be more than
offset by the apparent added non-monetary value, and/or have undetermined
cost savings that will exceed the projected increased proposal cost.)
Proposals 1A-1C are alternative methods to construct the diversion dam and
there potential savings are, therefore, dependent upon each other. All other
proposals are independent. At the December 6, 1996 oral presentation, the
Value Study Team and Fish and Wildlife representatives performed an
incremental cost versus worth analysis of all the diversion dam proposals. As
a result, Proposal 1B was selected as the preferred alternative. A brief
description and an estimate of the minimum potential value of the proposals
are:
Proposal No. 1A. Construct the replacement dam using a sheet pile
and riprap diversion structure. This approach produced several
identified desired value added features (removal of seasonal
restrictions, time, getting a solution in-place, etc.) and had the
potential to reduce costs by about $328,800.
Proposal No. 1B. Use roller-compacted concrete to construct the
replacement dam. Time and season requirements to construct using
this approach were identified to be less advantageous as that
identified in Proposal 1A. However, as compared to the Title I
concept, this construction technique would produce similar desired
value added features (time, getting a solution in-place, etc.) and
had the potential to reduce costs by about $493,100. This was
identified by the team and Service representatives to be the
preferred value study alternative for construction of the diversion
dam.
Proposal No. 1C. Construct the replacement dam using a diversion
structure constructed of grouted riprap and make use of the existing
sheet pile. Constructing the dam by this approach would produce
similar desired value added features (minimal season restrictions,
time, getting a solution in-place, etc.) and had the potential to
reduce costs by about $356,700.