FLOOD10318

• County: Arapahoe
• County: Jefferson
• Stream Name: South Platte River
• Basin: South Platte
• Title: Chatfield Reservoir, Roadway Analysis Study
• Date: 2/3/2004
• Prepared For: CWCB
• Prepared By: Sear Brown
• Floodplain - Doc Type: Project

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Opinion of Probable Cost
The following opinion of probable cost includes the engineer's estimate of probable
construction costs of the proposed roadway plus an allowance for professional services fees
for design and construction phase services. Construction phase services typically consist of
survey stakeout, materials testing, and on-site construction observation. Assumptions made
as part of the conceptual level cost estimate are as follows:
1. The costs used are based on current construction costs from projects bid in the 2003-2004
time frame within the Colorado Front Range. The projects used to determine applicable
average prices are public works roadway projects.
2. Where quantities and/or unit prices for particular items are not able to be determined with
reasonable accuracy at this level of design effort, the engineer has used his professional
judgment based to estimate a reasonable cost.
3. An allowance consisting of a percentage of construction cost has been allocated to allow
for professional design services and construction phase services including materials
testing, construction observation and construction staking. These percentages are based
on the engineers experience and professional judgment. Pre-design studies including
environmental assessments, cost impact studies, hydrological analyses, etc. have not been
included in this estimate.
4. Only the main roadway alignment shown is included in the cost estimate. Other minor
roadways, parking lots, buildings, etc. are not part of this estimate.