1c. Tanadoona Drive/Dogwood Road Reconstruction Project 06-06: Accept Feasibility Report; Call for Public Hearing
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone: 952.227.1100
Fax: 952.227.1110
Building Inspections
Phone: 952.227.1180
Fax: 952.227.1190
Engineering
Phone: 952.227.1160
Fax: 952.227.1170
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Phone: 952.227.1140
Fax: 952.227.1110
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Phone: 952.227.1120
Fax: 952.227.1110
Recreation Center
2310 Coulter Boulevard
Phone: 952.227.1400
Fax: 952.227.1404
Planning &
Natural Resources
Phone: 952.227.1130
Fax: 952.227.1110
Public Works
1591 Park Road
Phone: 952.227.1300
Fax: 952.227.1310
Senior Center
Phone: 952.227.1125
Fax: 952.227.1110
Web Site
www.cLchanhassen.mn.us
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MEMORANDUM
TO:
Paul Oehme, Director of Public W orks/City Engineer~ 0 ,
Alyson Fauske, Assistant City Engineer ~ ~
February 12, 2007 .
FROM:
DATE:
SUBJECT:
Dogwood/Tanadoona Improvement Project No. 06-06: Accept
Feasibility Report and Call the Public Hearing
REQUESTED ACTION (Simple majority vote required)
City Council is recommended to accept the feasibility study for the Dogwood/Tanadoona
Improvement Project and call the public hearing for February 26, 2007.
BACKGROUND
A feasibility report for the Dogwood Road Lateral
Extension was previously prepared for the City by
and revised May 21, 2001. A second feasibility report
January 17,2002, was also prepared by HTPO.
and Watermain
November 21, 2000
dated
On November 13, 2006, Council
feasibility report. This was the same
February 2006.
In February, 2006, Kimley-Horn & Associates
determine if the project is technically feasible
The cost of the feasibility report was paid for
The original cost estimates were distributed to the
held in April, 2006.
At the August 14, 2006 City Council
project in conjunction with the 2007 Street
On September 25,2006, the City Council awarded the
Project 06-06 to Kimley-Horn & Associates.
On January 22, 2007, Council approved
development south of Dogwood Road
approval and construction of City Project 06-06.
DISCUSSION
Residents along Dogwood RoadJ:!.~~~hg~!itt~B~cl.for City ,sanitary sewer and watermain
and roadway improvements. Approximately 16 residents attended an open house on
November 9,2006, including representatives from Westwood Community Church. The
The City of Chanhassen . A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play.
Paul Oehme
February 12, 2007
Page 2
neighborhood generally supports the project. Copies of the feasibility report are available
in the Engineering Department.
Staff is in support of the project for several reasons.
1. Most of the existing properties in this area are served by individual septic
systems. Some of these systems have failed or are anticipated to fail in the near
future. Because of the topography and the close proximately to the lake along
with the high water table in the area, some of these properties may not be able to
site a new septic system.
2. The roads along Dogwood Road and Tanadoona Drive are very narrow. Fighting
a structure fire in this area would be very problematic. Because of the narrOW
streets, staging a fire fight operation would be difficult according to the City Fire
Marshall. Also, city water is not available in this area and would need to be
trucked in to fight a fire.
3. The roads currently are asphalt millings that need constant maintenance by City
crews. Due to the step grades in the area the roads have a tendency to wash out.
The City pavement management program rates these streets as some of the
poorest condition streets in the City.
Sanitary Sewer and Watermain
All homes are currently served by individual wells. Three of the northern properties are
served by a small, City-owned and maintained lift station and forcemain; the remaining
properties are served by individual septic systems.
The proposed utility improvements will provide service to the proposed development at
the southern end of Dogwood Road, The Arbors. Gravity sanitary sewer will be installed
within Dogwood Road and will connect to the lift station at the southeast corner of
Dogwood Road and Tanadoona Drive. The lift station is proposed to be replaced to
handle the ultimate flows for this area. The forcemain from the lift station to the gravity
sewer within Tanadoona Drive is also proposed to be replaced to convey the additional
flow.
One hundred percent (100%) of the watermain and sanitary sewer construction costs will
be assessed to the benefiting property owners. The three homes currently served by the
lift station will not be assessed for the sanitary sewer improvements. Westwood Church
is not proposed to be assessed for lateral sanitary sewer or lateral watermain since they
were assessed for sanitary sewer and watermain trunk with Project 00-01, BC 7 & 8
utility extension. This assessment has been paid. Westwood Church is proposed to be
assessed for four (4) sanitary sewer services and four (4) water services.
Streets and Right of Way
Dogwood Road and Tanadoona Drive are currently gravel surface with millings and are
approximately 16 feet wide. The sum of the street reconstruction and the right of way
acquisition costs will be divided by the number of existing and proposed future lots along
Dogwood Road and the lots within The Arbors preliminary plat. This "unit cost" is
proposed to be assessed 100% to the vacant lots within The Arbors development.
G:\ENGIPUBLIC\06-06 Dogwood Road Imp\02-12-07 accept feasibility call public hearing. doc
Paul Oehme
February 12, 2007
Page 3
Forty percent (40%) of the "unit cost" is proposed to be assessed to all other units within
the project, including the two existing homes that are within The Arbors preliminary plat.
The proposed 40% assessment methodology is consistent with the City's assessment
policy.
At the neighborhood meeting in November 2006, residents requested that staff look at
shifting the Dogwood Road alignment to the east, within the overhead utility corridor
since trees have already been removed within this corridor. The estimated additional cost
to realign the road to the east, including additional right of way costs, is over
$160,000.00. The two property owners that would benefit and be assessed for these
additional costs do not support the realignment, therefore the realignment of Dogwood
Road is not being pursued.
The feasibility report includes the cost and impacts of constructing either an urban or a
rural (i.e. no curb and gutter) street section. If a rural street section is constructed, the
estimated assessment amount is $29,534.08/lot; $16,882.73/lot for the three units that are
currently connected to the City sanitary sewer. If curb and gutter streets are installed, the
estimated assessments are $30,106.81 and $ 17,455.45/lot, respectively. The assessments
are proposed over a 10-year period at 6% interest. Final assessment amounts will be
based on the construction costs.
The feasibility report proposes Dogwood Road be a 24-foot wide rural section (Option 1)
or 26-foot wide urban section (Option 2) from Tanadoona Drive to the northern property
line of The Arbors development. The City's standard 31-foot wide urban section road is
proposed in The Arbors development. Two of the residents noted on the Petition for
Public Improvement that the width of Dogwood Road should remain consistent from
Tanadoona Road to West 78th Street, 24 feet or 26 feet wide to save trees. Reducing the
width of Dogwood Road from 31 feet to say 26 feet for the portion adjacent to The
Arbors is estimated to save between one and four significant trees. Additional tree
preservation cannot be achieved due to utility installation conflicts and the proposed
grading required for the street development profile. The connection between the two
roadway sections would be transitioned with a 15: 1 taper. Staff does not anticipate a
problem with this design because of the road grades and the anticipated low traffic
volume along Dogwood.
Drainage and Runoff
A portion of the runoff from the southern portion of Dogwood Road within the Arbors
Development will be conveyed to a storm water pond constructed with the development.
North of the development, if the curb and gutter design for Dogwood Road is pursued, an
environmental manhole will be installed at the intersection of Dogwood Road and
Tanadoona Drive to treat the roadway runoff prior to discharging into Lake
Minnewashta.
Staff has looked for ponding opportunities in the project area. The only potentially
available site is on the Camp Tanadoona property. Staff has contacted Camp Tanadoona
representatives to pursue a drainage and utility easement over the low area on the
southwest corner of the Camp property for ponding. This would eliminate the need for
an environmental manhole at the Dogwood RoadlTanadoona Drive intersection. The
Camp Board of Directors will be meeting in February to discuss the proposal and discuss
the easement request. Staff will provide the Council with an update by March 2007.
G:\ENGIPUBLIC\06-06 Dogwood Road Imp\02-l2-07 accept feasibility call public hearing. doc
Paul Oehme
February 12, 2007
Page 4
If all of Dogwood Road is reconstructed as an urban street section (i.e. curb and gutter),
the estimated drainage improvement costs are $385,400, which includes storm sewer,
catch basins and a pond.
FUNDING
The proposed assessment methodology for the streets and right of way, utilities and
drainage improvements are outlined in the previous sections of this report. Funding for
this project is proposed as follows:
Special assessments
Revolving Assessment Fund
Storm Sewer Utility Fund
Optionl :
Rural Street Section
(no curb and gutter)
$1,532,147
$377,378
$252,275
$2,161,800
Option 2: Urban
street section
(curb and gutter)
$1,574,529
$397,996
$365,075
$2,337,600
Total:
SCHEDULE
The anticipated project schedule is as follows:
February 26, 2007:
March 12, 2007:
April 9, 2007:
May 14,2007:
May 2007:
October 2007:
Public hearing; Authorize preparation of plans and specifications
Approve plans and specifications; Order advertisement for bid
Call assessment hearing
Assessment hearing; Accept bids; Award contract
Construction begins
Construction substantially complete
RECOMMENDED MOTION
Accept the feasibility study for Dogwood RoadlTanadoona Drive Improvement Project
No. 06-06 and call the public hearing for February 26,2007.
Encl.: Preliminary Assessment Rolls (Option 1 and Option 2)
Exhibits 1 Improvement Drawing
c: Jon Horn, Kimley-Horn and Associates, Inc.
Chadd Larson, Kimley-Horn and Associates, Inc.
Bruce Carlson, Carlson Custom Homes
Peter and Deanna Brandt, 7570 Dogwood Road
G:\ENGIPUBLICl06-06 Dogwood Road Imp\02-l2-07 accept feasibility call public hearing. doc
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