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Of Report Number 14 -149 M .j Agenda Section VI -11 the city that works for you Council Meeting Date June 10, 2014 REQUEST FOR COUNCIL CONSIDERATION ITEM DESCRIPTION: CONSIDERATION OF CHANGE ORDER 1 FOR CITY PROJECT 14-5. OLD MILLER DUMP VERTICAL LANDFILL GAS VENTS. DEPARTMENT HEAD'S APPROVAL: (o awe CITY MANAGER'S APPROVAL: No comments to supplement this repo Comments attached Recommendation: Approve Change f3 r 1 to the contract for City Project 14 -5, Old Miller Dump Vertical Landfill Gas Vents. Contract Time — The language has been adjusted to include all Work will be substantially completed by August 1, 2014, and completed and ready for final payment by August 15, 2014. Legislative History: This item was first discussed at the June 11, 2013 City Council Worksession. The City Council approved the plans and specifications and authorized staff to advertise for the public bidding process at their November 26, 2013 meeting. The contract was awarded by the City Council to Belair Builders on March 11, 2014. Financial Impact: The contract for City Project 14 -5, Old Miller Dump Vertical Landfill Gas Vents was awarded to Belair Builders, Inc. in the amount of $194,313. Explanation: The scope of work includes installation of thirty-three new subsurface vertical landfill gas vents, including a pipe header system connecting the vents and associated pipe cleanouts and vent risers, and incorporation of this new system into the long -term landfill gas monitoring plan for the site. Horizontal spacing of the vertical vents will be approximately 30 feet, consistent with the estimated radius of influence recommended by the MPCA. The vertical vents extend approximately four feet above the ground surface, so the MPCA has approved a subsurface gas collection line connecting the vents together allowing a reduced number of 4 -foot vent risers to help alleviate the aesthetic concern of many vertical vent risers. The plan includes eight vertical vent risers, spaced every fourth vertical vent, to vent vapors to the atmosphere. The remaining twenty -five vertical vents will be completed at grade to allow for relatively easy access for any future maintenance needs or conversion to above ground risers if needed. The original contract required project completion by June 1, 2014. However, due to the winter / spring conditions, this project completion date will be extended 60 days, to August 1, 2014, as indicated in Change Order 1. Barr Engineering will provide inspection and monitoring services for this project. Costs and Funding: This project will be funded from the East Side Hazardous Substance Sub - district, Fund 494- 41405 -6751. Grant Wyff ls, P.E. Director of Public Works Enclosure: Change Order