HomeMy WebLinkAboutItem 11 PPP 07-01-2020 Ops Comm_P2-98A Covers Sole Source =� Sole Source
1 - for Primary Clarifier
16 a�r !
Covers
A-Side Primary Clarifiers
Replacement at Plant No. 2,
Project No. P2-98A
Kathy Millea, Director of Engineering
�- Operations Committee
July 1 , 2020
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A=Side Primary Clarifiers i
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Replacement at Plant No . 2
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Construction Cost: $132 million l �g3
Advertise for Bids: December 2020 `
Construction Duration: 5 yearsIC
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Existing Clarifier
Dome Cover
Diameter 140 feet
Height 21 feet
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Operator Access
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Operator Access
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.41 Cover Opt 'ion
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Geodesic Dome (Conventional) Flat Truss Supported
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• Allows staff entry • No staff entry
• Larger ventilation rate = • Lower ventilation rate = smaller
larger odor control facility odor control facility
• Decreased worker exposure to
gases or vapors
• Hinged panels are required
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Cover Evaluation -LI
• O&M activities and requirements
• Operators' visual access to water surface
• Ventilation rates with/without required entry
• Longer equipment life outside enclosed space
• Visited other facilities
• Conclusion :
• Flat covers offer $52 million savings due to reduced
ventilation
• Flat covers must offer hinged panels for operator
observation
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..... ole Source Justification0' 7-
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• Request for Information sent to flat cover
suppliers
• Only Hallsten offers 80-90% of panels to be
hinged .
• Hallsten has a proven, patented hinged
panel.
• One supplier only offers 20-30% of
panels hinged
1• One supplier offers only raised hatch
panels -
• Others require panels to be unscrewed
and lifted
• $5.3 million pricing commitment from
Halsten. Verified as reasonable based on
pricing of similar installations
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Recommended Actis
Adopt Resolution No. OCSD 20-XX entitled , "A Resolution
of the Board of Directors of the Orange County Sanitation
District, making findings pursuant to Public Contract Code
Section 3400 in support of the Sole Source Specification of
Hallsten Corporation , manufacturer of Truss Supported Flat
Aluminum Covers for A-Side Primary Clarifiers Replacement
at Plant No. 2, Project No. P2-98A, as part of Primary
Treatment Rehabilitation at Plant No. 2, Project No. P2-9877
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