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PUBLIC WORKS PROJECTS <br /> Department: Water <br /> Item: Treatment Plants 3, 4, & 5 and Well House 8 Building Improvements <br /> A. Treatment Plant 3A Filter Rehab/Radium Removal <br /> B. WTP 3A &4 Backwash Reclamation Project <br /> Year: 2016 (Item A) <br /> 2016 (Item B) <br /> Portions of Item A and all of B delayed based on use of deep wells during <br /> interim response to 1,4-Dioxane <br /> 2021 &2030 (Building Improvements) <br /> Cost: 2016-$375,000, (Item A.) <br /> 2016-$250,000, (Item B.) <br /> Portions of Item A and all of B delayed based on use of deep wells during <br /> interim response to 1,4-Dioxane <br /> Building Improvements (exterior treatments) <br /> 2021-$200,000 <br /> 2030-$335,000 <br /> Description: The three iron removal plants were built in the mid 1980's to supply <br /> water to the City during negotiations with the Army. These plants and their respective <br /> wells draw water out of the deeper Mount Simon / Hinckley aquifer. Well House 8 was <br /> also modified and drilled deeper at this time. The City entered into a water remediation <br /> agreement with the Army in 1990 and built a separate facility, the PGAC Plant, which <br /> has supplied over 95% of the City's water since then. The facilities needing attention <br /> supply water during the hot dry summer months and are capable of supplying all the <br /> cities water if a catastrophic failure should occur at the PGAC Water Treatment Plant. <br /> In 2004, the Minnesota Department of Health (MDH) notified the City that four of our <br /> deep drinking water wells were found to exceed the regulatory level of 5.4 picoCuries per <br /> liter for radium. In 2005, City water department personnel installed new special chemical <br /> feed equipment at City Water Treatment Plants 3, 3A, 4 and 5 in hopes of reducing the <br /> radium to below the regulatory level. The chemical feed equipment was a minimal cost <br /> solution but unfortunately did not correct the radium problem. In August of 2005, the <br /> City received a Notice of Violation from MHD ordering the City to develop a plan to <br /> reduce the radium to acceptable levels. <br /> In conjunction with the MDH, the City signed a Bilateral Compliance Agreement with <br /> the Minnesota Department of Health (MDH). Essentially, the agreement stated the City <br /> must return Water Treatment Plants 3 & 3A to compliance in 2006, Water Treatment <br /> Plant 4 in 2007, and Water Treatment Plant 5 in 2008. <br /> 11 <br />