Polson Water Supply Presentation to Polson City Council

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Polson Water Supply Presentation toPolson City
Council

• September 9, 2009

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PRESENTERS

• Roger Noble, Sr. Hydrogeologist
• Applied Water Consulting, LLC
• Tony Porrazzo, Superintendent
• Polson Water and Sewer Department

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WATER SUPPLY SOURCES

• Surface Water Hell Roaring Creek
• Alluvial Aquifer
• Groundwater Deltaic Aquifer
• Bedrock Aquifer

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HISTORY OF VIOLATIONSHELL ROARING CREEK

• May 16, 1995
• June 16, 1995
• June 20, 1995
• July 28, 1996
• July 31, 1997
• October 22, 1997

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• Violation of TCR and/or Fecal Coliform
• EPA Surface Water Treatment Rule
• HKM Feasibility Study
• Whitefish uses Haskill Creeks
• Upgrade costs 7,000,000

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HELL ROARING WATER RIGHTS

• Flow Rate Volume Priority Date
• 900 gpm 1,460 ac-ft January 3, 1922
• 1,125 gpm 1,825 ac-ft September 4, 1947
• (225 gpm) (365 ac-ft)

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• Depth Production Date
• Well No. (feet) Zone (feet) Constructed
• 1 525 251-292 1969
• 2 166 150-160 1960
• 3 177 152-174 1976
• 4 150 128-140 2000
• 5 135 113-125 2000
• 6 385 258-385 1999
• 7 350 239-350 2001
• 8 428 398-418 1970
• 9 530 512-524 1966
• Northwest Holdings

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• Well Permitted Current Volume
• No. Capacity Pumping Rate
  (ac-ft)
• 1 450 0 77
• 2 450 400 726
• 3 650 500 246
• 4 500 200 712
• 5 500 100
• 6 500 425 1,269
• 7 500 425
• 8 250 0 424
• 9 250 0
• Total 4,050 2,050 3,454
• Pumping 24/7/365 2,141 gpm

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IRON AND MANGANESE LEVELS

• Well No. Iron Manganese
• 6 1.27 ND
• 7 1.18 ND
• 8 0.13 0.39
• 9 ND 0.42
• MCL 0.30 mg/L 0.05 mg/L

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• Well No. Water Quality
• 2, 3, 4, 5 Excellent no Fe or Mn
• 6 and 7 High Iron treatable
• 1, 8, and 9 High Manganese
• Very expensive to treat

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RECOMENDATIONS

• Provide sufficient water supply to accommodate
  future growth
• Drill additional test wells to the north and
  west of PWS-3
• Drill test wells along the south shore
• Replace high manganese wells