3. High Zone Water Tower Construction: Accept Bids and Award Contract0
CITY OF
CBANHASSEN
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
Finance
Phone: 952.227.1140
Fax: 952.227.1110
Park & Recreation
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
7901 Park Place
Phone: 952.227.1300
Fax: 952.227.1310
Senior Center
Phone: 952.227.1125
Fax: 952.227.1110
Web Site
www.ci.chanhassen.mn.us
MEMORANDUM
TO: Todd Gerhardt, City Manager
FROM: Paul Oehme, Director of Public Works /City Engineer
DATE: August 22, 2011
SUBJ: High Zone Water Tower Construction: Accept Bids and Award
Contract
3
PROPOSED MOTION
"The City Council accepts bids and awards a contract to CB &I $2,096,001.00 for a
new high zone composite water tower located on Minnetonka School District 276
property, 6421 Hazeltine Boulevard ".
City Council approval requires a simple majority vote of the City Council present.
BACKGROUND
In November, 2008, the City completed an update to the Comprehensive Water
Plan. As part of the plan, a storage analysis was performed that recommended
additional storage be constructed in the existing high service zone. The high zone
water area has seen significant growth in recent years, which has driven the need
for additional storage capacity.
On May 19, 2011, staff discussed water storage needs in the high zone with the
Minnetonka School District and presented a proposal to the Board to construct a new
water storage tower in the southwest corner of the Minnetonka Middle School West
campus.
On May 23, 2011, staff presented a water storage needs analysis in the high zone to
the City Council at the worksession.
On June 8, 2011, staff held a neighborhood meeting to discuss the proposed water
tower at the southwest corner of the Minnetonka Middle School West campus.
On July 11, 2011, Council approved the plans and specifications and authorized
advertising for bids. Council also approved an agreement for purchase of easements
with School District 276 for permanent utility, temporary construction and future
access needs for the new water tower.
On August 4, 2011, the Minnetonka School Board approved an easement agreement
for constructing the water tower on the southwest corner of the Minnetonka Middle
School West campus.
Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow
Todd Gerhardt
High Zone Water Tower: Accept Bids and Award Contract
August 22, 2011
Page 2
DISCUSSION
The city has two main pressure zones. The low zone area services about 88% of the current city
demand. Two water towers service this area along with the east water treatment plant. The high
zone area is serviced by two wells and a 200,000 gallon water tower located next to Minnetonka
West Middle School. The tower was constructed in 1971. The low and the high zone areas are
currently not directly hydraulically connected to each other. Water from the low zone cannot be
pumped to the high zone at this time. The population of Chanhassen in 1970 was 4,875. Today
the population of Chanhassen is 22,952. The high zone is mainly in a residential service area
which has seen significant growth in the past 15 years. Currently, the demand in the high zone
area can be as little as 100,000 gallons a day during the winter months and as much as 1,800,000
gallons during peak summer time usage (2007).
Since the high zone does not have much storage capacity and water from the low zone cannot be
pumped to the high zone, during high demand periods the high zone tank cycles continuously
which causes many problems. The high cycling causes condensation to form on the tank which
accelerates tank corrosion. The condensation that forms on the tank also generates complaints
from adjacent properties because the condensation can fall off the tank and land on their
property. The continuous cycling also puts additional stress on pumps and motors needed to
supply the tower and is a very inefficient way to supply water. Also, the undersized storage
facility leaves little time for utility staff to respond to power outages and start auxiliary power
generation. In addition, the tank at this time is undersized for fire flow design.
One of the most critical roles that a water distribution system provides, especially in urban areas,
is fire protection. The Insurance Services Office (ISO) provides a score for municipalities based
on their ability to meet industry standards for required fire flow based on building size,
occupancy class, construction type, etc. Lower scores indicate better ability of systems to
suppress fires and typically result in lower insurance rates for commercial and industrial
property. The standard required available fire flow that ISO has is 3,500 gpm for 3 hours. Since
this is mostly a residential area and all the commercial buildings are sprinkled, the fire marshal
recommends using a 2,750 gpm for two hour fire flow. Based upon this needs analysis a
750,000 gallons tank was recommended.
BIDS
On Tuesday, August 9, 2011 at 2:00 p.m. four bids were received for the water tower construction.
The bids were then tabulated and checked for errors. The bids ranged from a high of $2,705,800.00
to a low of $2,083,011.00.
Bids with Bid Alternates
Engineer's
CB &I
Landmark
Phoenix
Caldwell Tanks,
Estimate
Structures
Inc
Composite Tank w /6' forms
$2,061,450.85
$2,083,001.00
$2,328,000.00
$2,344,474.00
No Bid
Composite Tank (6' forms)
$2,091,405.85
$2,096,001.00
$2,348,000.00
$2,367,474.00
No Bid
w /stained concrete column
Composite Tank w/ 4' forms
$2,061,405.85
No Bid
No Bid
No Bid
$2,476,800.00
Composite Tank w/ 4' forms
$2,091,405.85
No Bid
No Bid
No Bid
$2,506,800.00
w /stained concrete column
Fluted Column (steel) tank
$2,161,405.85
$2,161,001.00
No Bid
No Bid
$2,705,800.00
gAeng \pub1ic \_2011 projects \11 -03 -high zone tower project \082211 accpt bids award contract.doc
Todd Gerhardt
High Zone Water Tower: Accept Bids and Award Contract
August 22, 2011
Page 3
The bids received represent all the national firms that can construct this size tower. The low bid was
submitted by CB &I of Plainfield, IL. CB &I has constructed elevated tanks since 1894 has become a
global leader in design and construction of elevated water storage tanks. Staff recommends
approving the composite tank design with staining the concrete column in the amount of $2,096,001.
This contractor has worked on a variety of elevated water storage tanks of various sizes and styles in
Minnesota. CB &I was the contractor that worked on the Eden Prairie clock water tower. Also in the
last 5 years, CB &I has built water tanks for the Cities of Blaine, Carver, Chaska, Woodbury, Jordan
and Mound. They have also built numerous other water towers in Minnesota. Their work has been
acceptable. The foundation, grading, utility and other miscellaneous work will be supplied by
Minnesota contractors.
Staff has discussed additional cost saving items with the CB &I. Staff has identified an additional
$80,000 in potential savings to the project. These savings are from changing the watermain material
from HDPE to PVC, storm sewer pipe material from HDPE to RCP, and replacing the stairs with a
ladder to the cellular provider mezzanine. Also being discussed is eliminating the dehumidification
of the interior of the steel bowl during priming and painting. These cost saving are still being
formalized and will be brought back to Council for consideration as a deduct change order.
The total project cost is as follows:
Tower Construction $2,096,001.00
Indirect Costs $ 141,920.00
Easement Cost $ 150,000.00
$2,387,921.00
The proposed work was included in the 2011 -2015 Capital Improvement Plan.
SCHEDULE
• Utility Improvements and Soils Correction/Grading
• Tank Construction
• Tank Construction Substantial Completion
• Tentative Removal of Melody Hill Tower
Attachments: Pressure Zone Map
Virtual Images of Proposed water tower
Site Location Map
CIP Page
Resolution
Steve Brock, CB &I
Doug Klamerus, S.E.H.
September, 2011
June - September, 2012
June, 2013
Summer 2013 (contracted out
separately)
gAeng \pub1ic \_2011 projects \l 1 -03 -high zone tower project \082211 accpt bids award contract.doc
. . . . . . . . . . . . . . .
41
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Pressure Zones
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C3 Low Pressure Zone 88%
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Capital Improvement Program 2011 rhru 2015 Department Water System improvements
City of Chanhassen, MN contact Paul t)ehme
Project# W-042
Projectliame High Zone Elevated Storage Tank.
Account #1 700 - 7025 -4751
Account #2
Account #3
Account #4
Type Improvement
Useful Life
Category Utilities
Priority n/a
Total Project Cost: $1,900,000
ed on current and projected system demands, the high zone should have additional storage capacity. The 2008 water comprehensive plan
monends a total of-750,000 gallons for storage. Cun ently, the high zone only has 200,000 gallons of storage. The-location.of the tank has not
been determined, but a few locations were identified in the 2008 comprehensive plan. A tank siting study should be completed to identify the
tlocation.
meet current and future water demands for the high zone area and to meet recommended fire flow storage'
Expenditures 2011 2012 2013 2014 2015 Total
Construction 11900,000 1,900,000
Total 1,900,000 1190Q000
Funding Sources 2011 2012 2013 2014 2015 Total
Water Utility Fund 1,900,000 11900,000
Total 1,900,000 1,900,000
Impactf0fl=
135
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
DATE: August 22, 2011 RESOLUTION NO: 2011-
MOTION BY:
SECONDED BY:
A RESOLUTION ACCEPTING BIDS AND AWARDING CONTRACT FOR THE
HIGH ZONE WATER TOWER PROJECT NO. 11 -03
WHEREAS, pursuant to an advertisement for bids for the High Zone Water Tower Project,
bids were received, opened and tabulated, and the following bids were received complying with the
advertisement:
Bids with Bid Alternates
Engineer's
Estimate
CB &I
Landmark
Structures
phoenix
Caldwell Tanks,
Inc.
Composite Tank w /6' forms
$2,061,450.85
$2,083,001.00
$2,328,000.00
$2,344,474.00
No Bid
Composite Tank (6' forms)
$2,091,405.85
$2,096,001.00
$2,348,000.00
$2,367,474.00
No Bid
w /stained concrete column
Composite Tank w/ 4' forms
$2,061,405.85
No Bid
No Bid
No Bid
$2,476,800.00
Composite Tank w/ 4' forms
$2,091,405.85
No Bid
No Bid
No Bid
$2,506,800.00
w /stained concrete column
Fluted Column steel tank
$2,161,405.85
$2,161,001.00
No Bid
No Bid
$2,705,800.00
AND WHEREAS, CB &I is the lowest responsible bidder with a total bid awarded of
$2,096,001.00.
NOW THEREFORE, BE IT RESOLVED by the Chanhassen City Council:
The mayor and clerk are hereby authorized and directed to enter into a contract in the amount
of $2,096,001.00 with CB &I in the name of the City of Chanhassen for the High Zone Water
Tower Project No. 11 -03.
Passed and adopted by the Chanhassen City Council this 22" day of August, 2011.
ATTEST:
Todd Gerhardt, City Manager
Thomas A. Furlong, Mayor
YES NO ABSENT