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REQUEST FOR CITY COUNCIL CONSIDERATION ITEM DESCRIPTION: CONSIDERATION OF CHANGE ORDER 1 FOR CITY PROJECT 15-13, WTP 3 AND 4 BACKWASH RECLAMATION AND VESSEL 3A REHABILITATION DEPARTMENT HEAD’S APPROVAL: Craig Schlichting, Director of Community Assets and Development CITY MANAGER APPROVAL: No comments to supplement this report _______ Comments attached ______ Recommendation: To approve Change Order 1 in the amount of $20,598 for City Project 15-13, WTP 3 and 4 Backwash Reclamation and Vessel 3A Rehabilitation. Legislative History: This work was included in the 2015 Utility Rate Analysis and the project was authorized by the City Council on November 11, 2015. The project was broken into phases and a Quote for Phase 1 was awarded to Shank Constructors on February 23, 2016. On September 26, 2017, City Council approved plans and specifications for Phase 2. On October 16, 2017, Bids were opened, and on October 24, 2017, all bids were rejected. The project was re-advertised and bid on November 22, 2017. The contract was awarded to MN Mechanical Solutions on November 28, 2017. Financial Impact: During construction, the following items were added/deleted to/from the contract or their scope was expanded. This work includes: • Additional cost to paint the entire internal surfaces of Vessel3A, note that the entire internal surface of the filter cells is included in the base bid contract documents. Therefore, this additional cost is for the cost to coat the detention basin space and the aeration chamber space for vessel 3A. • Accept credit for not painting the internal surfaces of the filter cells for vessel 3 due to a condition assessment performed by KLM. • Additional cost to provide new air wash valves for vessel 3. This work was not anticipated at the time of the bid and would need to be paid for by change order. Explanation: The City’s three iron removal plants were built in the mid 1980’s to supply water to the City during negotiations with the Army. These plants and their respective wells draw water out of the deeper Mount Simon / Hinckley aquifer. Well House 8 was also modified and drilled deeper at this time. The City entered into a water remediation agreement with the Army in 1990 and built a separate facility, the PGAC Plant, which has supplied over 95% of the City’s water since then. The facilities needing attention supply water during the hot, dry summer months and are capable of supplying all of the city’s water if a catastrophic failure should occur at the PGAC Water Treatment Plant (WTP 1). With the discovery of 1, 4 Dioxane in early 2015, New Brighton transitioned to the use of only the Mount Simon Hinckley (deep wells). During hot/dry summers, the deep wells would not be able to meet domestic/irrigation demands so the City designed plans for a connection to Minneapolis water. In July of 2016, New Brighton substantially completed the construction of a Distribution Control Station (DCS), Minneapolis interconnection pipeline, and various site utility modifications. With this construction, New Brighton was interconnected to the Minneapolis water system. The interconnect provided the additional capacity needed, but the source of Minneapolis Water and their treatment processes does not allow for a blended use of groundwater. New AGENDA SECTION: Consent REPORT DATE: April 5, 2018 MEETING DATE: April 10, 2018