1b. Audubon Road Change Order No. 1 1/1° h
CITY OF MEMORANDUM
CHANHASSEN TO: Todd Gerhardt, City Manager
7700 Market Boulevard FROM: Paul Oehme, Director of Public Works /City Engineer Q
PO Box 147
Chanhassen, MN 55317
DATE: June 14, 2010
Administration SUBJ: Approve Change Order #1 for the Audubon Road Reconstruction
Phone: 952.227.1100 Project No. 10 -02
Fax: 952.227.1110
Building Inspections
Phone: 952.227.1180 PROPOSED MOTION
Fax: 952.227.1190
"Approve Change Order #1 for Audubon Road Reconstruction Project No.
Engineering 10 -02 in the amount of $134,985.00.''
Phone: 952.227.1160
Fax: 952.227.1170
City Council approval requires a simple majority vote of the City Council
Finance present.
Phone: 952.227.1140
Fax: 952.227.1110
BACKGROUND
Park & Recreation
Phone: 952,227.1120 On May 24, 2010, the Council accepted a bid for the Audubon Road
Fax: 952.227.1110 Reconstruction Project. The project cost came in under the engineer's estimate by
20 %. The project cost is $1,900,000. SRF Consulting completed the preliminary
Recreation Center design for the project and city staff completed the final plans and specifications,
2310 Coulter Boulevard
Phone: 952227,1400 bid out the project and will be completing the construction inspection. By staff •
Fax: 952.227.1404 completing the plans and specifications along with the construction observation, it
is estimated the City saved $175,000.
Planning &
Natural Resources In working with the property owners whose properties abut Audubon Road, these
Phone: 952.227.1130 property owners have requested staff look into lowering the road profile between
Fax: 952.227.1110 Valley Ridge Trail South and Valley Ridge Trail North to reduce the number of
Public Works retaining walls and provide better driveway approaches. The current design
1591 Park Road matches the current profile of the road but does improve site distance at Valley
Phone: 952.227.1300 Ridge Trail North. The current design meets all MnDot design standards. The
Fax: 952.227.1310 proposed change in the design was not included in the plans due to time
constraints.
Senior Center
Phone: 952.227.1125 The proposed change order design does have some added benefits to the roadway
Fax; 952227.1110 and to the abutting properties. The proposed change will eliminate approximately
Web Site half of the walls that were included in the original design. The driveway
www.ci.chanhassen.mn.us approaches will be improved between Valley Ridge Trail North and South. Less
restoration will be needed with the proposed change. Less storm sewer leads to
the adjacent properties will be needed. Less common borrow material will be
needed for the project.
• Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow
Todd Gerhardt
Audubon Road Reconstruction — Approve Change Order #1
June 14, 2010
Page 2
The proposed change however costs more mainly because 1,220 feet of 12"
diameter watermain in Audubon Road should be lowered. Typically, watermain
should be buried at 7.5' to reduce the likelihood of the pipe freezing. Since the
roadway is proposed to be lowered approximately 3', the watermain in this area
should also be lowered the same amount. In order for the watermain lowering to
take place and keep properties in service, temporary water connections will also
be needed. Several watermain gate valves will also need to be replaced. Most of
the change order has unit costs for each of the items which were bid out. The
lowering of the watermain is the main item that staff did need to get a unit price
for. The proposed change also requires more material to be exported. Staff has
reviewed the lowering of the watermain costs with other past projects and finds
the costs competitive with these projects.
The cost breakdown of the proposed change order is as follows:
Retain wall - $30,000
Storm sewer -$ 7,000
Landscaping /restoration - $40,000
Street and dirt work changes $93,150
Watermain improvements $118,835
$134,985
Funding for this work has been included in the financing for the project.
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