Item 4G Audio10, SOUTHLAKE
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Item 4G A Contract for Sanitary Sewer Manhole and wet well Repair
Recommendation
Approve contract renewal
for Lewis Concrete
Restoration for manhole
and wet well rehab
services
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Staff is requesting city council Approval of the contract renewal for Lewis Concrete
Restoration for manhole and wet well rehab services
FA
Background
• 2010 Sanitary
Sewer Evaluation
- Hydrogen Sulfide
gas formation
- Damage to concrete
structures
-14 Lift Stations
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In late 2010, RJN Group engineering completed a comprehensive assessment of
the Southlake wastewater collection system. Generally they found the network of
pipes to be in good condition and adequately sized to serve the needs of our
customers. Most of the defects found were on the concrete structures in the system
such as manholes, Junction boxes and lift station wet wells.
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Manhole Restoration
• Concrete subject to decomposition
• Remove damaged material
• Coat with epoxy resin
As waste water ages in the collection system, biological activity begins
decomposing the nutrients in the sewage. The fact that so much of Southlake's
waste water is collected in lift station wet wells and pumped to higher elevations ads
to this detention time. Hydrogen sulfide formation presents a respiratory hazard and
in the presence of water, it forms sulfuric acid. Constant exposure to this acid will
literally dissolve concrete structures over a number of years.
Contract and Funding
• Twelve month renewal
• Lewis Concrete Restoration
• Funding available
Annual Waste Water Operating
Budget and Utility CIP
last year the city solicited bids for epoxy coating manholes and wet wells to the
structural integrity of the structures and prevent further damage. The contract was
awarded to Lewis Concrete Restoration with up to four annual renewals. They have
requested a 4% increase for six of the twelve bid items in the contract as allowed in
the original bid. Since Lewis Concrete Restoration's performance during the first
year of the contract has been very good, staff is requesting council approval to
renew the contract for another twelve months. Funding for purchases under this
contract is available in the FY 2012 Waste Water Operations and CIP - Sanitary
Sewer System Rehabilitation Project. Additional funding for this project will be
provided in the FY 2013 budget.
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City of Southlake Strategy Map
The City of Southlake provides municipal services that support the highest quality of fif
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unrivaled quality in everything we do.
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The renewal of the manhole rehabilitation project links to the city's strategy map
relative to the focus area of Infrastructure. The specific corporate objective is invest
to provide and maintain high quality public assets.
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If you have any questions regarding this item, contact Bob Price at 748 -8097