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City Council Regular Meeting Minutes April 12, 2016 Page 5 1 concurred and stated they take the credibility of testing seriously and test results are released to 2 the public. 4 Mr. Hubmer presented five options for addressing 1,4 Dioxane: 1) blend City wells, 2) construct 5 deeper wells into the Mt. Simon - Hinckley aquifer, 3) purchase water from Minneapolis, 4) 6 purchase water from St. Paul Regional Water Services, or 5) implement treatment of 1,4 7 Dioxane. He explained why staff focused on Options 3 and 5 as being the most viable long term. 8 With regard to Option 2, Mr. Hubmer stated the City's wells are in the Prairie Du Chien -Jordan 9 aquifer and reviewed the advantages and disadvantages of using the deeper Mt. Simon - Hinckley 10 aquifer including the need to treat to remove radium and obtain a DNR permit. The 20 -year cost 11 to drill three new wells into that deeper aquifer is estimated at $18 million including 12 construction, financing, interest, maintenance, and production costs. 13 14 Mr. Hubmer reviewed the advantages and disadvantages of Option 3 to purchase water from 15 Minneapolis including loss of control on water costs. The 20 -year cost to construct the system 16 required to use water from Minneapolis is estimated at $35 million including capital, finance, 17 interest, maintenance, and production costs. 18 19 Mr. Hubmer then reviewed the advantages and disadvantages of Option 5 to implement 20 treatment including significant up front capital expenditure. The 20 -year cost to treat 1,4 21 Dioxane is estimated at $16.6 million including capital costs, financing, interest, maintenance, 22 and production costs. 23 24 Mr. Hubmer compared the costs of Options 2, 3, and 5 and displayed concept drawings and 25 colored renderings to expand the treatment plant. He stated staff is asking the Council to 26 consider authorization to proceed with final design. If approved, the schedule would be to accept 27 the feasibility report, order plans, and advertise for bids on April 12, receive bids and award the 28 contract in August 2016, begin construction in October 2016, and start up in August 2017. 29 30 Mayor Faust asked Mr. Fix to inform the Army that when the City does system enhancements, 31 it's on `their dime' and they will not try to have others pay that cost. He stated the City will be 32 honest and fair in how it approaches this issue, which has already been articulated by City staff 33 but he also wanted to make that clear. 34 35 Councilmember Stille noted Option 5 is not solely to treat 1,4 Dioxane and asked how that may 36 be of benefit. Mr. Hubmer stated this option would construct an advanced system for treatment 37 of emerging contaminants and adding it to the City's current treatment system will result in a 38 robust advanced system that treats a wide suite of known and emerging pollutants. 39 40 Councilmember Stille asked how much hydrogen peroxide will be needed for this level of 41 treatment. Greg Johnson, WSB, stated the concentration of peroxide is very low, less than 50 42 part per billion. 43 44 Mayor Faust opened the floor to the public for comment or question. 45