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Item 4G Audio10, SOUTHLAKE I 'll -W �c 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 "Q 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 �'_ -0 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. 3 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. 5 City of Southlake Strategy Map The City of Southlake provides municipal services that support the highest quality of fif ��� %/ for our residents and businesses. We do this by delivering outstanding value and unrivaled quality in everything we do. ® ® F BE A Safety& Mobility Infrastructure Quality Partnerships& Performance Management Security Development Volunteerism & Service Delivery ustom [I pshieve [he L2 Previdetravel C3 —Idaattracry -& CCAttract &keeptop -tler LS promote gpportuni�.: hlghaai stsndards untgvespe[esfor co nvenl<ncrwlthN buslnessestodrivaedynemsr& forpartnarshlps& 01 sef"t, c", &re a enjoyment Of pars nal r� n s vstalnetile etonomlc voluntaorinvolvement security Intererts nvlronment Manage the Business B1AChleve bsxt- 81COII.atiorMawlth B3 Enhance resvdent 84Provide T "improve Bb Optimise In <Fassstawsln ..1- partnarrte qusllry Of life &buxiness high quelmy perfermentaof .6 all citydlselpllnes Implementserviee austalnabllitythrqugh me delivery &gpentianal techaollgv sgluupns tqudsm servlce orpresses Provide Financial Stewardship Ft Adheta toflnencial management F3lmeztt0 provide &maintain F3 AShievefiscal wellness F4EStabliah &maintain prinslples &budget hi¢h quality publicastets eantlerdx cnecnve lnternalcontrels Promote Learning & Growth L3 Enwre our people La Enhance lendamhip U Attract. develop& L4rtacOgnlxe& LSEmpower v Onderstsnd the s[mtery& cepahlllnesfo deliver I relelna Skilled reward high derision -ma kin, how th.,— tributato6[ esulls V ,� workforce t pvrformara in theergen - 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. A U CITY Oli SOUTHLAKE �Q If you have any questions regarding this item, contact Bob Price at 748 -8097