3i. Plans & Specs for Cleaning, Painting and Repairing 100,000 Water Storage Tank, West 7th St. CITYOF 3c .
.,
1 N ...si , . CHANHASSEN
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�,' . 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
I (612) 937-1900 Aaiun ,y t,.? id`1,f,, 44p+Ap
MEMORANDUM N"i 'i �—°—
ITO: Don Ashworth, City Manager
6�` v'ubm:tea to Gor rv.!:n1
I FROM: Gary Warren, City Engineer �j
submitted to C Vial
DATE: January 4, 1989 /'`�'�'`l
ISUBJ: Authorize Preparation of Plans and Specifications for
Cleaning, Painting and Repairing 100 ,000 Gallon Elevated
Water Storage Tank on West 76th Street
IFile No. PW158A
When the City placed its new 3. 5 million gallon reservoir on-line
I last April , altitude valve improvements and modifications were
done to the 100 ,000 gallon elevated water storage tank located in
the downtown area. The downtown tank was built in 1965 and ori-
ginally painted in 1966 . The tank exterior and interior was
1 repainted in 1978. The firm of AEC Engineers, specialists
in this type of work, inspected the tank and have prepared a
report summarizing the repairs and modifications which are recom-
i mended at this time for this tank. The attached sheets are
excerpts from this report and, as summarized on page 3, the engi-
neer' s cost estimate for these repairs is approximately $70 ,100 .
IWhile the 100 ,000 gallon capacity of this tank is relatively
minor compared to the new reservoir, this tank does provide for
necessary backup in the system if and when the new reservoir is
I taken down for maintenance purposes. The City' s 1989 Water
Expansion Fund ( 402 ) includes a $75,000 budget item for these
repairs. The color format chosen for the new reservoir will be
Iused for this tank as well .
The next step in accomplishing this task is to prepare plans and
I specifications for bidding the project. Staff is very satisfied
with the services provided by AEC Engineers and it is therefore
recommended that they be authorized to prepare the plans and spe-
cifications for rehabilitation of the 100 ,000 gallon elevated
I water storage tank in accordance with the recommendations pre-
sented in the evaluation report dated August 11 , 1988.
IAttachments
1 . Evaluation Report Excerpts.
2 . Fund 402 CIP Budget Sheets.
I3 . ABC Contract.
II
INTERIOR AND EXTERIOR I
INSPECTION REPORT
100 MG SINGLE PEDESTAL '
SPHEROID - EAST TOWER
CITY OF C HANHASSEN ,
.. MINNESOTA
AEC PROJECT NO- 6008-634'
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um
I
. BY
AEC - ENGINEERS & DESIGNERS
511 11TH AVENUE SOUTH
' MINNEAPOLIS, MINNESOTA 55415
TELEPHONE 612/332-8905
ME
AM 1
I
AEC
1
r AEC - ENGINEERS & DESIGNERS 511 Eleventh Avenue South
Minneapolis, Minnesota 55415
612/332-8905
ELEVATED WATER TANK INSPECTION - NO. 5008-634
Client: City of Chanhassen
Tank Location: W. 76th Street & Iroquois Ave.
Tank Description: 100 MG Single Pedestal Spheroid
' Type of Coating: Interior: Epoxy
Exterior: Alkyd
Inspected by: Jack Kollmer
Date Of Inspection: July 25 . 1988
INSPECTION RESULTS
1 .0 Conclusions and Recommendations
' The following repairs or modifications are recommended:
1 . 1 Interior Structural
1 . 1 . 1 Install one ( 1 ) 24-inch round AWWA hinged
ventilation roof manway approximately 180 degrees
' from the existing manway. This will provide proper
ventilation for the removal of dust and explosive
vapors during interior surface preparation and
' coating . For a typical manway, see AEC Standard
Drawing in Appendix B. See photos in Appendix A.
' 1 . 1 . 2 Weld the unwelded interior seam of the existing
roof manway, and one ( 1 ) small repair plate on the
interior of the tank. See photo 2 .
' 1 . 1 . 3 Remove all rigging brackets and scab marks below
the High Water Level (HWL) by air arc gouging,
cutting torch , or grinding, there are 6 rigging
' brackets and approximately 30 scab marks. See
photos 3 , 4 & 5 and refer to Appendix C Surface
Preparation Requirements. Remove by grinding all
' random and excessive weld splatter on weld seams.
1 . 1 .4 Epoxy caulk gaps or porosity of the overlapped roof
plates and roof plate to shell plates. See photos 6
1 . 1 . 5 Weld the unwelded underside of the single stiffener
on the dry well tube. See photo 8 .
1 . 1 . 6 Add T' handle wrench to drain plug to facilitate
' drain plug removal for tower cleaning and
maintenance. See photo #9 .
Branch Office: 13807 Village Mill Drive • Midlothian, Virginia 23113 • 804/379-3944
1
Page 2
Project No. 5008-634
1 . 2 Interior Coating '
1 . 2. 1 Visually, the interior coating is in almost perfect
condition with very few rust spots or coating
failures. However, the coating on the lower shell
and bowl area has started to fail in the form of
blisters of 1/4 to 1 inch in diameter. See photos
10 and 11 .
1 . 2 . 2 The coating should be replaced in 3 to 5 years.
1 . 2 . 3 After structural repairs are completed, the entire
reservoir surfaces should be properly prepared and
the coating replaced with light-colored polymide
epoxy system, similar to Rust-Oleum Series 9500
Epoxy , Koppers Hi-Guard Epoxy, or the Tnemec Series
20 Pota-Pox Epoxy . '
1 . 3 Exterior Structural
1 . 3 . 1 The owner should consider to replace the tank
vent/assembly with a new mushroom style, removable
top , vent similar to AEC Standard Drawing as found
in Appendix B. See photo(s) 12 & 13 for reference I
to current conditions. The new vent and vent screen
design should meet Awwa D100 and local Health
Department regulations. The removable top will also I
allow for access to the tank interior for
ventilation and rigging during reconditioning. The
present vent assembly does not meet totally the
Health Department regulations for roofs or vents.
Install a welded or bolted in place cover over the
present ventilation opening.
1 . 3 . 2 Install a hasp and locking device on the roof '
manway . Health Department regulations require
"manholes above the waterline shall have a locking
device" . See photo 14.
1 . 3 . 3 Install an overflow pipe screen retainer assembly
and screen to meet Health Department regulations.
Use a corrosion resistant, heavy-gauge screen with a
mesh size no smaller than 1/4 inch square opening.
See photo 15 , and AEC drawing in Appendix B. I
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AEC
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I Page 3
Project 5008-634
I 1 . 3.4 Epoxy caulk porosity around anchor bolts and base
plates to halt corrosion from standing rainwater.
See photo #16 .
I1 .4 Exterior Coating
1 .4. 1 Due to age, chalking, deterioration, some lack of
I intercoat adhesion, and lack of resistance to
mechanical damage ( rocks) and graffiti , the entire
exterior coating should be removed and replaced with
an epoxy/urethane coating system, similar to those
I manufactured by the Koppers or Tnemec companies.
The exterior reconditioning should be scheduled at
the same time as the interior. This will allow the
I interior and exterior reconditioning schedules to
coincide, is more cost effective, and prevents
additional tower out-of-service time. See photos
I 17 thru 20 for interior and exterior dry area paint
conditions.
2 . 0 Engineering Cost Estimates
I2 . 1 Interior structural repairs $ 4 , 600
I 2 . 2 Interior coating
Type of coating - epoxy system $ 16 , 750
2 . 3 Exterior structural repairs $ 1 , 925
I2 .4 Exterior coating
Type of coating - epoxy/urethane system $ 35 , 275
I2 . 5 Engineering specifications and
inspection fee $ 11 , 550
I2 . 6 Estimated Total Cost $ 70 , 100
2 . 7 Estimated job duration 4 weeks
I2 .8 These cost estimates represent the current pricing
structure. If you plan to proceed with the coating of
I this tank, the sooner the specifications are ready for
bidding , the more competitive the bids will be.
I
AEC
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Page 4
Project No. 5008-634
3.0 Future Inspection Schedule
3. 1 The tank painting should be first inspected within
the warranty period, and every three years
thereafter.
4.0 Life of Coating System
4. 1 With the recommended paint system and a regularly
scheduled tank inspection and maintenance program, the
tank interior and exterior should not require complete
recoating for the next fifteen to twenty years. '
Report submitted by: ,
AEC - ENGINEERS & DESIGNERS
4‘/C;;„
ohn R. Buzek, P. E. '
President
44) Mir
Date
Enclosures - Field Inspection Report '
- Appendix A
- Appendix B
- Appendix C
chan634
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AEC
iC
II y FUND: 402 WATER EXPANSION
FUNCTION: CAPITAL PROJECT FUND
IL1989 BUET
Qd?I1 meIItary
IThis fund derives its money from water hook-up charges and is dedicated to pa
oversizing and other general benefit costs associated with the water utility y
system. Revenue into this fund fluctuates
based on development in areas where t greatly in that collections are
the construction pro Jett rank costs were not assessed as part of
P .
{
FIVE YEAR CAPITAL IMPROVEMENT PROGRAM
FOR THE CHANHASSEN WATER SYSTEM
�rrn>`r ESTIMATED
MR DESCRrp
' 1988 _-MU
Install chart recorders on wells and
elevated tanks.
I 15,000
Watermain replacements
1. Bowling alley 12,000
2. Creek Run 8,000
II 20,000
General repairs
_1D-DE,
II 1989 45,000
Painting and general repair of West 76th Street
water tower
II 75,000 Or'
Remove pumps and liner at well #4 and
overhaul/repair as necessary
25,000
I Construct Lake Lucy Road Trunk Watermain
150,000*
General Repairs
II --HQ.
1990 260,000
Construct Well #5
I 80,000
Painting and general repair of Murray Hill
Water tower
120,000
I General Repairs
___15_.4.1Q
1991 215,000
I Remove pumps and liner at well #2 and
overhaul/repair as necessary
30,000
General Repairs
II 1992
General Repairs 45,000
15.000
II * Note: 15,000
Lake Lucy trunk watermain feasibilit has
Y been authorized. The feasibility
IIstudy will pose several funding scenarios. $200,000 Bonds of 1986, $150,000 - 402.
II -78-
}) y
AEC - ENGINEERS & DESIGNERS 511 Eleventh Avenue South
Minneapolis,Minnesota 55415
612/332-8905
August 17, 1988
Mr. Gary G. Warner, P.E. ,CITY OF CIJANHAS 1
City Engineer/Public Works Director M
(� hat2�
City of Chanhassen, MN 115 U
690 Coulter Drive, P.O. Box 147
AUG 18 1988
Chanhassen, MN 55317
Subject: Proposal to provide E� 'Y EERIN DEPT.
Engineering Services for � '' "
Reconditioning of the 100 MG
East Tower
Dear Mr. Warner,
As you requested, we are submitting our proposal to prepare
specifications for the cleaning, painting, and repairing of the
above referenced elevated water tower and to provide Field
Inspection Services during reconditioning.
The specifications will include: '
o Instructions to bidders.
o Proposal forms.
o Project specifications, including scope of work, workmanship,
paint materials, health and sanitary facilities, starting date,
completion date, liquidated damages, guarantee, and payment.
o General conditions, including the authority of the engineer, '
arbitration, right of owner to terminate- contract, extension of
time, insurance, etc.
o Copy of the AEC Inspection Report.
AEC will advertise the project in the Construction Bulletin, issue
the specification to prospective bidders, evaluate the proposals,
and recommend a qualified contractor.
AEC will provide this service for a flat fee of $3,000.00. '
Field inspection during reconditioning, as a minimum, will include
the following:
o A preconstruction meeting with the client and the contractor to
clearly define our role and objectives, and to discuss the intent
of the specifications.
o Inspection of the blasting media and blasting equipment to
prevent the tank shell from becoming contaminated with moisture
or oil.
Branch Office: 13807 Village Mill Drive • Midlothian,Virginia 23113 • 804/379-3944 I
II ' . .
II Mr. Gary G. Warner
Page 2
to Checking tank ventilation and safety precautions.
I o Monitoring the coating application for conformance with
manufacturer's recommendations, good painting practices, and the
specifications.
Io Recording the temperature and humidity and, if necessary,
stopping the work.
1 o Recording the painter's progress for adherence to the job
schedule.
Io Monthly submittal of daily inspection reports.
o Authorizing progress payments.
IThe duration of the painting inspection depends on the time it takes
the contractor to paint the structure.
U The AEC fee for the painting inspection is on a time and materials
basis in conformance with the enclosed Fee Schedule. Based on a
four-week painting schedule, we anticipate that our fees for
uinspecting the reconditioning work will not exceed $8, 000.00
If you find this proposal acceptable, please sign the enclosed copy
II of this letter in the space provided and return it to us.
Sincerely,
IIAEC-ENGINEERS & DESIGNERS Accepted this day
of
Z' / � /
City of Chanhassen, MS1, 1988
John R. Buzek, P.E. By
;I President Officer
Enclosure
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AEC
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511 Eleventh Avenue South
AEC - ENGINEERS & DESIGNERS Minneapolis,Minnesota 55415
612/332-8905
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FEE SCHEDULE
Engineering $60.00/hour
Senior Technician $55.00/hour
Technician $37 .00/hour
Inspector $37 .00/hour
Drafting $25.00/hour '
Clerical $20.00/hour
The above rates are based on standard working hours.
Reimbursable Expenses '
The following expenses are reimbursable to AEC:
1 . Expenses of transportation and living when traveling in connec-
tion
with a project. Personal or company automobile = 30 ¢/mile.
2. Travel time - billed at labor rates above, with a maximum of
eight hours per day.
3. Long distance calls, telegrams/telegraph, express mail . ,
4. Computer charges.
5. Duplicating costs/office supplies.
6. Outside consulting services.
7. Project related expenses, such as equipment rental .
Billing
Invoices are issued on a monthly basis. Payment terms are net 30
days. Invoices not paid within 30 days will carry a charge of 1 . 5
percent per month on the unpaid balance.
Effective date: February 1 , 1988.
Branch Office: 13807 Village Mill Drive Midlothian,Virginia 23113 804/379-3944