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REDS TECHNICAL MEMORANDUM To: Don Peterson, Director of Public Works From: Aaron Vollmer, PE and Abbie Browen, PE, Advanced Engineering and Environmental Services, Inc. (AE2S) Re: Mounds View — Water Treatment Plant No. 1 Rehabilitation Project February 22nd, 2021 Council Meeting Date: February 22, 2021 BACKGROUND The Public Works Department has many responsibilities including efficiently operating the water distribution system. The system includes (6) wells, an elevated water tower, a ground reservoir, a booster station and (3) water treatment plants (WTP). The water treatment systems have been in operation for over 25 years with no major upgrades or repairs to the system. Routine maintenance has been performed on the well motors and pumps and the operating systems and controls have had only minor repairs. Public Works has discovered that many of the components are obsolete and no longer are available to make repairs. Back on October 3rd, 2016, the Public Works Department, with AE2S, presented the findings of a water production study and water system management program to the City Council. At this meeting staff recommended engineering and bidding for the needed improvements in 2019. The design project started with a pilot study at Water Treatment Plant (WTP) 1 and 3 to verify selections of treatment techniques to meet primary treatment objectives. During initial piloting, the MN Department of Health (MDH) brought it to the City and AE2S' attention that they had exceeded the regulated maximum contaminant level (MCL) for radium at WTP 1. As a result, the rehabilitation of that facility was removed from the original project scope. Design of WTP 2, WTP 3 and Booster Station improvements continued through October 2019. The first project (Contract No. 1) was awarded in early 2020 to Shank Constructors, Inc. To date, WTP 3 has been rehabilitated to substantial completion, the Booster Station is ready for start-up as soon as the new natural gas generator is installed in the coming weeks, and WTP 2 rehabilitation is well underway. All three facilities are planned to be substantially complete in early May 2021. P01008-2073-001 Page 1 of 5 Think Big. Go Beyond. yj� p www.ae2s.com i ■7�.