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Polson Water Supply Presentation to Polson City Council

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  1. Polson Water Supply Presentation toPolson City Council September 9, 2009

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

  3. WATER SUPPLY SOURCES • Surface Water – Hell Roaring Creek Alluvial Aquifer • Groundwater Deltaic Aquifer Bedrock Aquifer

  4. HISTORY OF VIOLATIONSHELL ROARING CREEK • May 16, 1995 • June 16, 1995 • June 20, 1995 • July 28, 1996 • July 31, 1997 • October 22, 1997

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

  6. HELL ROARING WATER RIGHTS Flow RateVolumePriority 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)

  7. 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

  8. Well Permitted Current Volume No.CapacityPumping 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

  9. IRON AND MANGANESE LEVELS Well No.IronManganese 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

  10. 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

  11. 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