HomeMy WebLinkAbout12 Airport Water Tank Agenda Item # 12
Public Utility District
ACTION
To: Board of Directors
From: Mark Thomas
Date: May 05, 2010
Subject: Consideration of Action Regarding the Airport Water Tank
a) Adopt a Resolution Declaring an Emergency with Respect to the
Airport Water Tank and Dispensing with Competitive Bidding to
Refurbish the Tank
b) Award a Contract to Refurbish the Airport Water Tank
1. WHY THIS MATTER IS BEFORE THE BOARD
Only the Board can declare an emergency and dispense with the competitive bidding
process. Board approval is required for expenditures in excess of$15,000.
2. HISTORY
The Airport Water Tank was built in 1979 by Crom and is a 600,000 gallon unit
constructed of prestressed concrete. The dome ring which supports the tank roof is
failing and needs immediate repair. The tank plays a critical role in the water
distribution system. The Airport Well is the system's largest producing well and is
dependent upon this tank to produce.
3. NEW INFORMATION
With the high water demand season upon us, we cannot afford to lose this source. A
bidding process would delay the repair work for 3 to 4 weeks.
DYK Incorporated is one of the few companies in the United States that specializes in
construction and repair of prestressed concrete tanks. Staff contacted DYK about the
Airport Water Tank. Design and repair costs were negotiated at $115,253. DYK stated
repair work on the tank could begin by the middle of May 2010 and be completed by
the end of June 2010. The entire scope of this repair is described in DYK's proposal
included as Attachment 1.
As an alternative to performing the repair, a new tank could be constructed in the
same general area as the existing tank. This tank would be smaller, approximately
100,000 gallons, and would cost from $200,000 to $250,000 including design,
geophysics, demolition of old tank, and new construction. The estimated time to
complete the new construction would be December 2010.
4. FISCAL IMPACT
There are sufficient funds in the 2010 Water Capital Reserve Fund.
5. RECOMMENDATION
a) Adopt a Resolution (Attachment 2) declaring an Emergency with respect to the
Airport Water Tank and dispensing with competitive bidding to repair and refurbish
the tank.
b) Award DYK Incorporated the contract for the design and the repair for the Airport
Water Tank in the amount of $115,253 plus a 10 percent change order allowance
for an amount not to exceed $126,778.
c) Authorize a transfer of up to $126,778 from the Water Capital Reserve Fund to the
Water General Fund.
Michael D. Holley
General Manager/ Water Utility Manager
Attachment 1
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ADDRESS: 351 CYPRESS LANE EL CAJON, CA 92020 • MAILING: P.O. BOX 696 • EL CAJON, CA 92022-0696
PHONE. (619) 440-8181 • FAX: (619) 440-8653 • WEB: WWW.DYK.COM • EMAIL: DYKINCC&DYK.COM
April 19, 2010
Mr. Mark Thomas
Mr. Michael Holley
Truckee-Donner PUD
P.O. Box 309
Tuckee, CA 96160
600,000 Gallon Airport Reservoir
Truckee, California
Dear Gentleman:
Attached you will find our revised proposal to restore the dome prestressing for your
Airport Reservoir to its original as built conditions. As you know, we have been
hampered by the lack of information regarding the original design. We understand you
inherited the tank as part of the takeover of another system and the only records that exist
is one drawing containing just generic details with very limited real structural
information. Based on this limited information and our conversations, we believe the
following information is correct:
• The tank has an inside diameter of 70'-0" and a water depth of 18'-0".
• The tank has a concrete free span dome which you measured as 3" thick. The
roof was most likely reinforced with #3 or #4 bar in each direction which would
result in approximately 1" of concrete cover, top and bottom assuming the rebar
was adequately supported and a uniform dome thickness was provided. You have
noted that in at least one location on the underside of the dome the rebar is
exposed and corroded. There is also evidence of cracking on the top of the dome
although the extent of this cracking is hard to determine due to the condition of
the dome coating. We would recommend a thorough examination of the
underside of the dome and repair of any spalled concrete. For the top of the
dome, the deteriorated coating should be tested for hazardous material, safely
removed, cracks sealed, any spalls repaired and a new coating applied. This work
is not included in our proposal but we can provide guidance on selection of
materials for your forces to use.
• The wall is most likely an AWWA D 110 Type 2 wall made of shotcrete with an
integral thin metal diaphragm. The tank was most likely constructed by Crom
Tanks, a now defunct company formally from Reno, Nevada. No evidence of
distress on either the interior or exterior of the tank has been noted including in
the area you recently excavated to work on the tank piping. We would
recommend you perform a thorough investigation of the tank wall interior prior to
working on the dome. This work is not included in our proposal but we can
provide guidance on selection of materials for your forces to use if any
deterioration is noted.
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Mr. Mark Thomas
Mr. Michael Holley
Page 2 of 3
April 19, 2010
• The tank floor may be as thin as 4" and there is no distinct wall footing. Because
of the thinness of the floor, limited concrete cover and rigid floor to wall
connection, the floor and particularly the floor to wall connection on this type of
construction have been known to have significant leakage problems in other
tanks. Leakage is a concern not only for the loss of water but also because it has
the potential to undermine the tank structure or lead to further deterioration. You
indicated you have performed a leak test of the tank and no loss was evident. We
would recommend you perform a thorough investigation of the tank floor and
floor to footing connection prior to working on the dome. This work is not
included in our proposal but we can provide guidance on selection of materials for
your forces to use if any deterioration is noted.
• As noted in the attached proposal, DYK will remove the outer layer of gunite
depositing it on the ground (for your forces to remove and dispose of) that has
substantially delaminated from the single wire prestressing and in some cases
fallen off exposing the wire to the elements. From the sample removal you
recently performed, the gunite came off easily exposing dirt and moisture trapped
behind the gunite creating an ideal environment for further corrosion to occur.
• Since we only have limited information on the design of the existing tank and to
prevent overstressing of the dome and top of wall, after discussion with you it was
decided to supply enough prestressing to restore the prestressing that has been lost
due to corrosion. We are not upgrading the dome to current seismic, snow or
other code requirements but only restoring the dome to the original design and
attempting to slow any further deterioration. The assumptions we made in
determining the correct amount of new prestressing to supply were:
o Each original prestressing wire had a diameter of 0.196", an area of 0.030
square inches, a minimum ultimate strength of 250 ksi, were initially
stressed to 70% of ultimate strength and had a time dependent stress loss
of 25 ksi. This would result in a final force per wire of 4.5 kips.
o There are 45 wires exposed in the outer layer resulting in a final force
before corrosion of 202.5 kips for the outer layer. By code the minimum
clearance between wires should have been 3/8" which was obviously not
met. There is evidence of at least one inner layer of prestressing but the
total number of layers or number of wires per layer is unknown.
0 5 bands of 0.6" diameter galvanized strand would provide a force of
approximately 122.5 kips. This is equivalent to restoring up to 60% of the
original prestressing lost to corrosion. With the wire currently exposed
this appears to be a somewhat conservative assumption but would have to
be confirmed after all of the original gunite is removed. We would also
recommend carefully removing the gunite between layers at a few
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4 • 4 1
Mr. Mark Thomas
Mr. Michael Holley
Page 3 of 3
April 19, 2010
locations around the dome to confirm the assumption that the inner
layer(s) are not corroded. If we find more than 60% corrosion of the outer
layer of existing wire or significant corrosion on an inner layer we may
have to evaluate adding an additional layer of new banding.
We appreciate the opportunity to propose on this work. If you should have any questions
on the enclosed, or if we can be of further assistance,please feel free to contact us.
Sincerely,
William J. Hendrickson
CEO
DYK Incorporated
NOW I!
PURATED
ADDRESS: 351 CYPRESS LANE • EL CAJON, CA 92020 • MAILING: P.O. Box 696 • EL CAJON, CA 92022-0696
PHONE: (619) 440-8181 • FAX: (619) 440-8653 • WEE: WWW.DYK.COM • EMAIL: DYx1NCCbDYK.COM
PRESTRESSING CONTRACT PROPOSAL
Date: April 19,2010 Proposal No.: 100419R License No.: 584105
To: Truckee-Donner PUD Description: 0.6 MG Airport Tank
P.O.Box 309 Seismic Dome Repair
Truckee,CA 96160 Location: Truckee,CA
Phone: 530-587-3957 Owner: Truckee-Donner PUD
Attn: Mark Thomas(markthomas(&,tdpud.org)
Cc: Michael Holley(michaelholley_(&,,tdpud.orjz)
DYK offers to do the following work, in accordance with the attached drawings and calculations. DYK's contract price is based on
the conditions outlined hereunder. In arriving at the cost, a continuous, and an uninterrupted operation was assumed starting with the
day DYK was requested to move in. DYK is bidding this project as an equal opportunity contractor.
A. SERVICES FURNISHED BY DYK:
1. Design: Shop drawings and calculations indicating the identification and location of all components used
in the system.
2. Scaffoldiniz: DYK shall provide and install all required scaffolding and equipment to complete its scope
of work. Truckee-Donner PUD (TDPUD) shall provide a level work area 7' wide completely around the
tank including ramp access.
3. Repair: Remove or repair all damaged, spalling, deteriorated or otherwise unsound existing shotcrete on
dome ring. Remove all loose or failed prestressing and clean all existing prestressing. Repair cleaned
areas with grout.
4. Circumferential Prestressing: Furnish and install 5 prestressing bands.
5. Shotcrete:
a. Furnish and install 1/2" initial shotcrete over existing, cleaned, dome ring. Furnish and install
1.5"final shotcrete cover over prestressing bands, couplings, and conduit.
b. Apply 7-day water cure upon completion of the shotcrete. Water for curing to be furnished by
TDPUD.
Note: DYK's bid is based on all existing coatings on the tank dome ring and dome exterior being non-
hazardous. Any damaged prestressing and concrete removed from the dome ring and dome will be
deposited on the ground around the tank. Any further removal or containment of the removed
material(if required)will be performed by TDPUD or by DYK at an additional cost to TDPUD.
TOTAL CONTRACT: $115,253.00
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B. SERVICES FURNISHED FREE OF CHARGE TO DYK BY TDPUD:
1. With Respect to all operations:
a. TDPUD shall furnish any safety fencing that may be required by DYK or OSHA around the
site. TDPUD shall be responsible for site security, including security guards. TDPUD shall be
responsible for the security and well being of DYK's equipment, tools, and materials stored at
the project site and shall reimburse DYK all direct costs associated for damage or loss of
equipment, tools, and materials as a result of vandalism or theft.
b. At all times, provide satisfactory all weather access to the tank and storage area for DYK's trucks
carrying equipment and materials. If trucks and trailers are unable to safely reach the tank and
storage area, the TDPUD will be liable for any towing costs, lost time, damage to our equipment,
unused crane time, etc.
C. Provide any shoring and dewatering necessary for a safe and efficient performance of DYK's
work and in accordance with all applicable laws and regulations.
d. Provide a minimum clearance of 7'-0"from outside the tank wall from grade level upward.
e. Submit shop drawings of all items to be cast in or bolted to the wall and roof(before proceeding
with the installation of such items) for DYK to review and approve in order that DYK may be
assured that there will be no interferences with the operation of DYK's machinery.
f. TDPUD shall remove prior to DYK's move in and replace after DYK's work is complete any
obstructions such as the exterior ladder and handrails that prevent free access to the existing dome
ring all around the tank. The anchor detail for all appurtenances including the exterior ladder and
handrails shall be submitted by TDPUD to DYK for review to protect against damaging the
prestressing.
g. Provide a level and flat storage area within 10' from the tank large enough to store all
prestressing steel, shotcrete materials and wrapping and shotcrete machinery required for that
tank. The minimum dimensions of this area shall be 50' X 50'.
2. With Respect to Prestressing:
a. Store the required prestressing steel within 10' from the tank.
b. Due to safety requirements, no work will be done by unauthorized personnel within two hundred
(200) feet of the reservoir core wall during the circumferential prestressing activities. DYK
authorized personnel must approve modification to this 200'.
3. With Respect to the Shotcrete:
a. Furnish potable water at 40 psi minimum pressure and 10 gpm minimum volume within 25' from
the tank.
b. Unless stated otherwise,cure the shotcrete as per specifications.
C. Rebound will be removed from and will be deposited on the ground by DYK. Beyond the above
mentioned rebound removal, if required,TDPUD is responsible.
d. TDPUD shall provide and pay for all required concrete/shotcrete testing, excluding
preconstruction testing required for approval of shotcrete mix designs and any re-testing during
the project due to a failure on our part to achieve required results.
C. PAYMENT CONDITIONS FOR MATERIALS FURNISHED AND WORK DONE:
1. Progress Payments shall be made monthly and in accordance with DYK's Progress Payment Schedule
and reach DYK by the tenth (10t') of the month for materials furnished and/or work completed in the
previous month. TDPUD shall withhold no greater than 5%retention.
2. Final Payment in full shall reach DYK within thirty-five (35) days from the date that DYK has
physically completed its work under this Agreement. TDPUD shall give verbal or written approval of
DYK's work before DYK leaves the site, in order to satisfy and insure itself that the work has been done
Proposal# 100402R Page 12
to everyone's satisfaction.No final payment shall be delayed because of delays in water testing. Payment
in full shall not relieve DYK from correcting faulty materials and workmanship within the specified
Guarantee Period(one year).
3. Payment: All payments made by TDPUD pursuant to this contract shall be made to DYK Incorporated at
P.O. Box 696, El Cajon, California 92022 and to no other party, sub contractor or supply house, unless
specifically directed by DYK in writing. All such payments shall be received by DYK by the tenth(1 Oth)
day of the month immediately following the work period for which billing was made.
4. Interest: Overdue payments shall bear interest of 0.05% per calendar day (18.25% per annum) on all
overdue amounts, in dispute or otherwise,until paid.
5. Back Charges: Except as provided for under Par. F, there shall be no back charge of any sort by either
party unless and until an authorized representative of each party has agreed to in writing the reason for
and the extent of such back charge prior to such services being rendered by or for one of the parties under
this Agreement.
6. Performance/Payment Bonds: If TDPUD desires DYK to furnish a performance/payment bond the
charge for such bonds shall be paid directly to DYK's bonding agent by TDPUD or may be paid directly
to DYK at DYK's direct cost plus ten percent(10%).
7. Substitution of Securities: TDPUD shall assist DYK in setting up an escrow account for substitution
of securities in lieu of retention. Interest from this escrow account shall be payable to DYK
Incorporated.
8. Insurance: DYK reserves the right to increase the contract amount of this proposal if DYK is required to
participate in an Owner Controlled Insurance Program, Contractor Controlled Insurance Program, or
similar program that has a higher cost to DYK than our own program.
D. CONSTRUCTION TIME
1. The following is a summary of the ANTICIPATED construction time starting with the first work
day following the completion day of all the services TDPUD is to provide under the above
paragraphs,which time makes no allowance for weather and unforeseeable conditions (to be added
by TDPUD):
a. Required notice(in writing)to commence work 4 Weeks
b. Repair,prestressing bands and shotcrete 8 Weeks
E. TESTING:
TDPUD shall provide and pay for all required materials testing, shotcrete and concrete testing(including sand and
aggregate). DYK shall be responsible for any preconstruction testing required for approval of shotcrete and
concrete mix designs and for any retesting during the project due to a failure on our part to achieve required
results. TDPUD shall provide and pay for all inspections including overtime inspections. TDPUD shall be
responsible for all required testing and warranty inspections not specifically noted in this proposal as DYK's
responsibility.
F. STANDBY TIME
In the event that TDPUD has not completed the services it is to provide under this agreement by the date that
DYK is required to start work, resulting in a stand bye time for DYK's personnel, or if DYK is delayed in
performing its work,DYK reserves the right to seek compensation from the TDPUD for any delays caused by the
TDPUD or the TDPUD's subcontractor, suppliers, agents or employees.
Proposal# 100402R Page 13
8a:•
G. DISPUTES
In the event that a dispute has to be settled by the Courts or through Arbitration, the losing party shall pay all
attorney, court and arbitration expenses incurred by the prevailing party within 10 calendar days from each date of
settlement, or within 10 calendar days from date of each invoice. Payments shall not be withheld should the
verdict be appealed.
H. COMPLETE AGREEMENT:
This document contains all covenant, stipulations, and provisions agreed by the parties. No agent or
representative of either party has authority to make, and the parties shall not be bound by or be liable for, any
statement,representation,promise or agreement not set forth herein.
J. ACCEPTANCE:
Since it is imperative to DYK that it is able to place its material orders (such as for prestressing material) before
price escalations occur, this proposal is hereby offered for acceptance for a period of up to thirty(30) days. DYK
reserves the right, after this period, to amend its bid and to reflect any changing construction schedules and
material and labor rate changes. The return to DYK of an accepted, endorsed copy of this proposal, within the
above referenced time period, will constitute a contract between DYK and TDPUD. DYK reserves the right to
void this proposal and any contract with the TDPUD if the TDPUD or any related party fails to make any
payments as required by law on another contract with DYK. This proposal shall be made a part of any
subcontract agreement or purchase order. DYK reserves the right to negotiate or reject any or all terms of any
subcontract agreement or purchase order utilized by the TDPUD. DYK will only agree to a Type III indemnity
clause.
DYK Incorporated
Lt - I C:��-�
David Gourley
Vice President Construction Date: April 19, 2010
Accepted this proposal
Signature of authorized person
Date:
Title
Proposal# 100402R Page 4
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DONNE" Attachment 2
Public
Resolution No. 2010 - XX
FINDING AN EMERGENCY SITUATION AT THE
AIRPORT WATER TANK AND DIRECTING THAT
COMPETITIVE BIDDING BE DISPENSED WITH IN
CONNECTION WITH ACTION TO
REPAIR AND REFURBISH THE WATER TANK
WHEREAS, the Airport Water Tank was built in 1979 by Crom and is a 600,000 gallon unit
constructed of prestressed concrete; and
WHEREAS, the dome ring which supports the tank roof is failing and needs immediate
repair; and
WHEREAS, the Airport Well is the system's largest producing well and is dependent upon
the Airport Water Tank to produce; and
WHEREAS, the high water demand season is upon us and the District cannot afford to
lose this source; and
WHEREAS, a bidding process would delay the repair work for 3 to 4 weeks; and
WHEREAS, DYK Incorporated is one of the few companies in the United States that
specializes in construction and repair of prestressed concrete tanks; and
WHEREAS, staff has negotiated with DYK to perform the repair work on the tank which
could begin by the middle of May and be completed by the end of June 2010; and
WHEREAS, the District's repair of the dome ring on the prestressed concrete Airport Water
Tank has created an emergency which, pursuant to Public Contract Code 22050, is
justification for the District to dispense with competitive bidding;
NOW THEREFORE BE IT RESOLVED that the Board of Directors of the District adopt the
above recitals as its findings; and
BE IT FURTHER RESOLVED by the Board of Directors that for the reasons set forth
above, the District finds that the failure of the dome ring on the Airport Water Tank has
created an emergency and that the emergency will not permit a delay resulting from a
competitive solicitation for bids and that a contract to refurbish the water tank is necessary
to respond to the emergency.
BE IT FURTHER RESOLVED that the District shall therefore dispense with competitive
bidding for the repair of the prestressed concrete Airport Water Tank.
1 Resolution 2010-XX
BE IT FURTHER RESOLVED BY THE Board of Directors that it hereby delegates the
authority to take all necessary action to repair and refurbish the Airport Water Tank to the
District's General Manager.
BE IT FURTHER RESOLVED that the Board of Directors shall review the emergency
action at its next regularly scheduled meeting and at every regularly scheduled meeting
thereafter until the action is terminated to determine whether there is a need to continue
the action.
PASSED AND ADOPTED by the Board of Directors at a meeting duly called and held
within the District on the fifth day of May 2010 by the following roll call vote:
AYES:
NOES:
ABSTAIN:
ABSENT:
TRUCKEE DONNER PUBLIC UTILITY DISTRICT
Jeff Bender, President
ATTEST:
Michael D. Holley, District Clerk
2 Resolution 2010-XX