Title
Agenda Item:
Approval of Final Construction Costs for 18th Avenue Improvements Project
Body
Issue:
Staff is requesting that Council approve final construction costs which include additional costs due to soil issues and traffic control.
Committee Recommendation:
Not referred to a commitee.
City Manager's Recommendation:
Move to authorize the City Manager to approve final contract documentation and final payment to the contractor of up to $3,020,000.
Staff Contact:
Jim Rioux, Project Manager, Public Works Technical Services, 360.753.8484
Presenter(s):
NA
Background and Analysis:
On March 12, 2012, Council authorized the City Manager to execute a contract with Active Construction, Inc. (ACI) for the 18th Avenue Improvements project. ACI submitted the low bid of $2,520,396. This was 18% below the Engineer's estimate of $3,061,144.
On June 12, 2012, Council authorized an increase in project contingency from 10% to 15%. The City planned to use soil excavated from the storm ponds as foundation material under the sidewalks. This material was not suitable for that purpose and required a large change order to import new gravel and remove the soil from the ponds.
In addition to unsuitable soils, two other subsequent field conditions caused increased project costs. The contractor encountered native soils impacted with gasoline and needed more flaggers to control traffic. Following are the summaries of these major cost increases:
· Unsuitable Soil - Material from the storm ponds could not be used under the sidewalks.
Additional costs - $193,000.
· Impacted Soil - During excavation of the storm pond near Boulevard Road, the contractor encountered soil that was impacted with gasoline. There were additional costs associated with testing and properly disposing of the affected soil.
Additional costs - $25,000.
· Flaggers - Under this contract, flaggers were paid on an hourly basis. Staff did not anticipate the effort needed to manage traff...
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