Water Supply Plan & Hydrogeology "Westside Presentation"

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A presentation on the Water Supply Plan & Hydrogeology of the Westside associated with the Rosemont Copper Project developed by the Erroll L. Montgomery & Associates, Inc. This presentation was given to the Forest Service, the Cooperating Agencies, and their contractors during technical transfer meetings in January 2009.

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Water Supply Plan & Hydrogeology "Westside Presentation"

  1. 1. WATER SUPPLY PLAN & HYDROGEOLOGY“WESTSIDE PRESENTATION” January 16, 2009ERROL L. MONTGOMERY& ASSOCIATES, INC.
  2. 2. PRESENTATION OUTLINE 1.  Water Supply Plan 2.  Test Well Drilling and Testing Program 3.  Local Residential Well Programs 4.  Hydrogeology and Groundwater Conditions 5.  Groundwater Flow ModelingERROL L. MONTGOMERY & ASSOCIATES, INC.
  3. 3. WATER SUPPLY PLANERROL L. MONTGOMERY & ASSOCIATES, INC.
  4. 4. RECENT GROUNDWATER PUMPING IN THE GREEN VALLEY-SAHUARITA AREA Average of 90,300 acre-feet/year based on ADWR records, 2000-2006 SIERRITA MINE (29,200 acre-feet/year) Mining Use Agriculture Use 42% 36% TWIN BUTTES FICO/ FARMERS WATER COMPANY (32,300 acre-feet/yr) MISSION MINE SAHUARITA & RANCHO SAHUARITA LAS QUINTAS SERENAS COMMUNITY WATER ARIZONA STATE LAND COMPANY DEPT. TUCSON WATER GREEN VALLEY DOMESTIC (Corona de Tucson) Municipal Use WATER 20%Groundwater pumping shown as a percentage of total for largeusers (>500 acre-feet per year) south of Township 15S. ERROL L. MONTGOMERY & ASSOCIATES, INC.
  5. 5. GROUNDWATER PUMPING IN THE GREEN VALLEY-SAHUARITA AREA WITH ROSEMONT SIERRITA MINE (Average of 95,300 acre-feet/year) (29,200 acre-feet/year) Mining Use (45%) TWIN BUTTES Ag. Use (34%) MISSION MINE FICO/ FARMERS WATER COMPANY (32,300 acre-feet/yr) SAHUARITA & RANCHO SAHUARITA LAS QUINTAS SERENAS COMMUNITY WATER COMPANY TUCSON WATER (Corona de Tucson) ROSEMONT (permitted for 20 GREEN VALLEY DOMESTIC years) WATER Municipal Use ARIZONA STATE LAND DEPT. (21%)Groundwater pumping shown as a percentage of total for large users(>500 acre-feet per year) in area south of Township 16S. Source: ADWR,2000 to 2006. Rosemont pumping of 5,000 acre-feet/year. ERROL L. MONTGOMERY & ASSOCIATES, INC.
  6. 6. MAJOR KNOWN FUTURE GROUNDWATERPUMPING IN GREEN VALEY-SAHUARITA AREA 1.  Existing M&I •  Community Water Company •  Green Valley Domestic Water, Las Quintas Serenas, Rancho Sahuarita •  Corona de Tucson (Tucson Water) 2.  New M&I •  FICO – ag converting to M&I •  AZ State Lands – (14,980 AF/year) 3.  Mining •  Asarco Mission Mine •  FMI Sierrita Mine •  Twin Buttes •  Rosemont ERROL L. MONTGOMERY & ASSOCIATES, INC.
  7. 7. RECHARGE IN TAMAERROL L. MONTGOMERY & ASSOCIATES, INC.
  8. 8. ROSEMONT TEST WELLS – SAHUARITA AREA Ø Two wells constructed to depths of 1,211 (RC-2) and 1,300 feet (E-1) Ø Characterization of basin-fill sediments and groundwater quality (geophysical and lithologic logs) Ø Pumping Test Results Ø Transmissivity: 1,340 (RC-2); 2,680 (E-1) ft2/day Ø Anticipated well production: 500-1,500 gpm Ø Excellent groundwater quality Ø  TDS range 210 (RC-2) to 340 (E-1) mg/LERROL L. MONTGOMERY & ASSOCIATES, INC.
  9. 9. LOCATIONS OF RC-2 & E-1ERROL L. MONTGOMERY & ASSOCIATES, INC.
  10. 10. SCHEMATIC OF EXPLORATION WATERWELL E-1 AND LOGGING SUMMARIESERROL L. MONTGOMERY & ASSOCIATES, INC.
  11. 11. EXPLORATION WATER WELL E-1ERROL L. MONTGOMERY& ASSOCIATES, INC.
  12. 12. EXPLORATION WELL E-1 LOGGING SUMMARIES ERROL L. MONTGOMERY & ASSOCIATES, INC.
  13. 13. SCHEMATIC OF PRODUCTION WATERWELL RC-2 AND LOGGING SUMMARIESERROL L. MONTGOMERY & ASSOCIATES, INC.
  14. 14. PRODUCTION WATER WELL RC-2 ERROL L. MONTGOMERY & ASSOCIATES, INC.
  15. 15. PRODUCTION WELL RC-2 LOGGING SUMMARIES ERROL L. MONTGOMERY & ASSOCIATES, INC.
  16. 16. CORRECTED DRAWDOWN AND RECOVERY DATA FOR PUMPED WELL E-1 DURING CONSTANT-DISCHARGE PUMPING TEST -10 EXPLANATIONCORRECTED DRAWDOWN AND RESIDUAL DRAWDOWN, IN PREPUMPING WATER LEVEL 226.67 FEET BELOW LAND SURFACE PUMPING STARTED 13:05 MARCH 23, 2007 PUMPING STOPPED 13:05 MARCH 24, 2007 AVERAGE PUMPING RATE 312 GALLONS PER MINUTE CORRECTED DRAWDOWN AND RESIDUAL DRAWDOWN, IN FEET TRANSMISSIVITY (DRAWDOWN DATA) = 150,000 GALLONS PER DAY PER FOOT TRANSMISSIVITY (RECOVERY DATA) = 20,000 GALLONS PER DAY PER FOOT RECOVERY 0 NOTE: DATA CORRECTED TO ACCOUNT FOR REGIONAL WATER LEVEL RISE DURING TEST FEET 10 Pump down from t = 48 min to t = 51 min 20 DRAWDOWN 1 10 100 1,000 10,000 TIME, IN MINUTES, AFTER PUMPING STARTED and RATIO t/t (t - TIME AFTER PUMPING STARTED / t - TIME AFTER PUMPING STOPPED) TIME, IN MINUTES, AFTER PUMPING STARTED AND RATIO t/t’ (time after pumping started / time after pumping stopped) FIGURE 4. GRAPH OF CORRECTED DRAWDOWN AND RECOVERY DATA FOR PUMPED WELL E-1 DURING CONSTANT-DISCHARGE PUMPING TEST ERROL L. MONTGOMERY & ASSOCIATES, INC.
  17. 17. DRAWDOWN AND RECOVERY GRAPH FOR PUMPED WELL RC-2 DURING CONSTANT-DISCHARGE PUMPING TEST 0 RECOVERYDRAWDOWNDRAWDOWN AND RESIDUAL DRAWDOWN, IN FEET FEET 50 Transmissivity = 10,100 gpd/ft AND RESIDUAL DRAWDOWN, IN Theis (1935) Straight-Line Recovery Method 100 Transmissivity = 9,200 gpd/ft Cooper and Jacob (1946) Straight-Line Drawdown Method DRAWDOWN 150 200 EXPLANATION 250 PREPUMPING WATER LEVEL 259.27 FEET BELOW LAND SURFACE PUMPING STARTED 08:00 NOVEMBER 12, 2007 PUMPING STARTED 08:00 NOVEMBER 13, 2007 AVERAGE PUMPING RATE 1,046 GALLONS PER MINUTE 300 1 10 100 1,000 10,000 TIME, IN MINUTES, AFTER PUMPING STARTED and RATIO t/t (time after pumping started / time after pumping stopped) TIME, IN MINUTES, AFTER PUMPING STARTED AND RATIO t/t’ (time after pumping started / time after pumping stopped) ERROL L. MONTGOMERY & ASSOCIATES, INC.
  18. 18. GROUNDWATER MONITORING PROGRAMØ  GIS database of ~200 registered wells and ~535 tax parcels in monitoring areaØ  United Sahuarita Well Owners picked 11 monitoring locationsØ  Water quality samplingØ  Continuous water level monitoring ERROL L. MONTGOMERY & ASSOCIATES, INC.
  19. 19. GROUNDWATER MONITORING PROGRAM ERROL L. MONTGOMERY & ASSOCIATES, INC.
  20. 20. Access to ADWR “realtime” data Ø ADWR equipped both Rosemont with monitoring and relay equipment Ø Water level data available at www.azwater.gov Ø Continuous, realtimeERROL L. MONTGOMERY & ASSOCIATES, INC.
  21. 21. WELL OWNER PROTECTION PROGRAM Ø Letter of Intent signed in July 2008 Ø Well must be registered with ADWR Ø Unique program, details are still being developedERROL L. MONTGOMERY & ASSOCIATES, INC.
  22. 22. WEST SIDE HYDROGEOLOGY Sahuarita HeightsERROL L. MONTGOMERY & ASSOCIATES, INC.
  23. 23. WEST SIDE HYDROGEOLOGYq  Groundwater occurs in basin-fill depositsq  Hydrogeologic Units Ø Ft. Lowell Formation (dry in Sahuarita Heights) Ø Tinaja beds (principal aquifer)q  Silty sand with minor gravelly zonesq  Depth to water 200 to 250 feet Ø Substantially deeper during irrigation seasonq  Groundwater flow toward northwestq  Water level trends over timeØ Wells in study area produce from a few to more than 2,000 gpmERROL L. MONTGOMERY & ASSOCIATES, INC.
  24. 24. GO TO CLICKABLE HYDROGRAPHS
  25. 25. WEST SIDE HYDROGEOLOGYERROL L. MONTGOMERY & ASSOCIATES, INC.
  26. 26. WEST SIDE HYDROGEOLOGYERROL L. MONTGOMERY & ASSOCIATES, INC.
  27. 27. WEST SIDEGROUNDWATER FLOW MODEL q  Began with ADWR Tucson AMA Groundwater Model Ø Numerical Basin-Wide Model Ø MODFLOW Software Ø Half-Mile Grid Cell Spacing Ø Three Layers Ø Simulation Periods Ø 1940 – 1999 Pre-development and Transient Ø 2000 – 2024 PredictiveERROL L. MONTGOMERY & ASSOCIATES, INC.
  28. 28. WEST SIDEGROUNDWATER FLOW MODEL q Refinement of Model Following Data Evaluation Ø Update Groundwater Pumpage Ø Evaluate & Modify Groundwater Recharge Ø Aquifer Parameters from Drilling & TestingERROL L. MONTGOMERY & ASSOCIATES, INC.
  29. 29. WEST SIDEGROUNDWATER FLOW MODELq Pumping Updates - historic Ø Recent Updates Provided by ADWR for 2000 – 2006 Ø Othersq Recharge Updates – historic Ø Pima Mine Road Ø Effluent Recharge Ø Santa Cruz River Ø Mine Tailings
  30. 30. WEST SIDEGROUNDWATER FLOW MODEL q Results of Model Calibration Ø Overall match in study area Ø Match in Sahuarita Heights areaERROL L. MONTGOMERY & ASSOCIATES, INC.
  31. 31. LOCATIONS OF CALIBRATION HYDROGRAPHSERROL L. MONTGOMERY & ASSOCIATES, INC.
  32. 32. ERROL L. MONTGOMERY & ASSOCIATES, INC.
  33. 33. ERROL L. MONTGOMERY & ASSOCIATES, INC.
  34. 34. ERROL L. MONTGOMERY & ASSOCIATES, INC.
  35. 35. ROSEMONT WEST PLAN MAPERROL L. MONTGOMERY & ASSOCIATES, INC.
  36. 36. WEST SIDE GROUNDWATER FLOW MODELq Rosemont Water Supply Simulations Ø Rosemont Pumping 5,000 AF/year for 20 years – through 2031 Ø Future Pumpage by Other Groundwater Users Ø Future Recharge at USFs and WWTPs ERROL L. MONTGOMERY & ASSOCIATES, INC.
  37. 37. WEST SIDEGROUNDWATER FLOW MODELq  Pumping Updates - future Ø FICO Ø ASLD Ø Mission Wellfield Ø Rancho Sahuarita Ø Mining Ø Othersq  Recharge Updates – future Ø Pima Mine Road Ø Santa Cruz River Ø Others
  38. 38. WEST SIDEGROUNDWATER FLOW MODELq Model Projections - Pending Ø Impacts to Regional Groundwater Levels Ø Impacts to Local Domestic Wells Ø Refined Local Grid Analysis

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