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� City of Pequot Lakes — - Option 2— Poly Pig or Ice Pig the distribution system, (only the cast pipe). I have sent maps of the Cities distribution system to Infratech, Inc. to get an idea of the cost to Poly Pig some of the oldest water mains. This method physically scours the inside of the mains to rid them of collected scale. This method can be very effective in not only reducing the scale but can also have a side benefit of lowering chlorine costs. But as I stated earlier it has a down side. The cost estimate (low) for this process is $220.00 per hour and each poly pig costs $30.00. If we have them here for five 10 hour days it would cost $1100.00 in labor. If we don't have the right amount of gate valves in the right places we might not get all the lines desirable. Were probably looking at about $2500.00 min to $5000.00 max to pig the northwest part of town. I cannot get Infratech to put it in writing as of this date. Option 3— Chemical addition of a blend of Ortho/poly phosphate. This option has the City adding the same chemical that other towns use to control lead and copper leaching. This chemical coats the inside of the pipes with a calcium layer so to speak and can reduce or stop the further decaling of the Cities water main. Hawkins has estimated the cost of $1.50 / lb of product `— Carus chemical has estimated the cost at 1.40 / lb of Carus 8100 with a feed rate of 2.2 gallons per million gallons. Last year we produced 35 million gallons; 35x2.2 = 77 gallons of Carus 8100 a 55 gallon drum costs $877.40 plus the feed pump at about $600.00 � On September 26, 2012 we were inspected by the department of health, he reaffirmed to me that this is not a health issue, that the iron and manganese test results are under the minimum standards for drinking water. I asked him about the chlorine theory and he said that he had never heard of chlorine pills causing this problem. I asked him about the new water plant causing the issue with the cleaner water causing the scale to weaken. He wasn't sure about that but it's possible. Changes in flow or velocity were the items he believed were the cause. His recommendation and now mine will be for the City to add chemicals to the distribution system. Respectfully submitted, Lee Bundy Facilities Manager 4638 COUN'IY RO.�D 11 • PEQU(7T LAI:ES, �fN 56472 •(218) 568-5222 • F.�: (218) 568-5860 • ww�¢pequodakes-mn.gov