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Noise Study
For the Rosemont Copper Project




By Robert Sculley &
Michael Dieckhaus
Purpose of the Noise Study

 § Identify existing background noise levels
   in the project area
 § Provide information on noise levels at
   active copper mines
 § Provide preliminary noise modeling
   analyses of traffic noise and blasting
   noise



                   Noise Study
Notes from the Noise Study

 § Noise modeling analyses have not been
   completed yet
 § This presentation will focus on the results
   from the ambient noise monitoring
   program




                   Noise Study
Background Noise Monitoring at Project Area

 § Multi-day noise monitoring at locations closest
   to existing residences
 § Multi-day monitoring at other locations
   representative of project area conditions
 § 5 locations in southern part of project area
   (closest to residences) monitored for a 3 day
   period over Memorial Day weekend




                     Noise Study
Background Noise Monitoring Approach

 § 1 location in the northern part of the project area
   (closest to residences) monitored for a 2 day
   period after Memorial Day weekend
 § 2 locations near the proposed mine pit area
   monitored for 2 days after Memorial Day
   weekend




                      Noise Study
Active Copper Mine Noise Monitoring Approach

 § Emphasis on monitoring blasting events at an
   active copper mine
 § First monitoring at 2 locations approximately
   one mile from a blast location
 § Several hours of monitoring to include
   background noise levels from haul trucks,
   shovel and other general mine activity




                     Noise Study
Active Copper Mine Noise Monitoring Approach

 § Supplemental noise monitoring at the same
   active mine included:
  • Two additional blast events
  • 3 locations at various distances from the blast
  • Two noise meters at each location, one
    running for 8 hours, the other running
    continuously for 48 hours




                    Noise Study
Active Copper Mine Supplemental Noise Monitoring

 § Locations of monitoring included:
   • At the edge of the pit with line-of-site to the
     blast locations (0.25 and 0.5 miles from the
     two blast sites)
   • 100 feet from the edge of the pit (0.25 and 0.5
     miles from the two blast sites)
   • Along a haul road one mile from the blast
     sites, and close to a truck wash facility



                      Noise Study
Noise Monitoring Instrumentation

 § Two types of noise meters used for the study
   • Primary: Larson Davis model 820 sound level meters
     • Type 1 (precision) integrating sound level meter
     • Dynamic measurement range from 18 dBA to 110
       dBA
   • Secondary: Center Technology model 322 sound
     level meters
     • Type 2 (general purpose) sound pressure level
       meter; not an integrating sound level meter
     • Auto-ranging with dynamic range from slightly under
       30 dBA to 100 dBA


                        Noise Study
Larson Davis Model 820 Sound Level Meter




                  Noise Study
Center Technology Model 322 Sound Level Meter




                     Noise Study
Basic Field Procedures

 § Instruments set to A weighting, fast response
 § Larson Davis meters set to log one-minute basic
   time histories and 15-minute interval histories
 § Center 322 meters set to log data at one-
   second intervals or at 3-second intervals
 § Instruments mounted on camera tripods at a
   height of about 5 feet
 § Instruments calibrated with a Larson Davis
   Class 1 acoustic calibrator


                     Noise Study
A-Weighted Decibel Examples




                    Noise Study
A-Weighted Decibel Examples




                    Noise Study
Important Noise Measurement Terms

 § Leq = equivalent constant noise level ( energy-
   averaged noise level)
 § Ldn = day-night average noise level (a 24-hour
   Leq with a 10 dBA penalty factor added to
   nighttime [10 pm to 7 am] noise levels)
 § Lmax = maximum Leq over 1/8 second intervals
   at fast response setting; Lmax is how people
   hear rapidly fluctuating noise



                     Noise Study
Project Area Monitoring Locations




                                 SR 83




                   Noise Study
Meter at Monitoring Site L1




                   Noise Study
Noise Levels At Monitoring Site L1




                   Noise Study
Noise Levels At Monitoring Site L1




                   Noise Study
Meter at Monitoring Site L2




                   Noise Study
Noise Levels At Monitoring Site L2




                   Noise Study
Noise Levels At Monitoring Site L2




                   Noise Study
Meter at Monitoring Site L3




                   Noise Study
Noise Levels At Monitoring Site L3




                   Noise Study
Noise Levels At Monitoring Site L3




                   Noise Study
Meter at Monitoring Site L4




                   Noise Study
Noise Levels At Monitoring Site L4




                   Noise Study
Noise Levels At Monitoring Site L4




                   Noise Study
Meter at Monitoring Site L5




                   Noise Study
Noise Levels At Monitoring Site L5




                   Noise Study
Noise Levels At Monitoring Site L5




                   Noise Study
Meter at Monitoring Site L6




                   Noise Study
Noise Levels At Monitoring Site L6




                   Noise Study
Meters at Monitoring Site L7




                   Noise Study
Noise Levels At Monitoring Site L7 – LD820




                   Noise Study
Noise Levels At Monitoring Site L7 – C322




                   Noise Study
Meter at Monitoring Site L8




                   Noise Study
Noise Levels At Monitoring Site L8




                   Noise Study
Meter at Monitoring Site L9
Meter at Monitoring
Site L9




                   Noise Study   39
Noise Levels At Monitoring Site L9




                   Noise Study
Conclusions: Project Area Noise Levels

 § Low existing average noise levels in the project vicinity
 § Noise levels mostly less than 45 dBA
 § Noise levels higher on ridge lines than in intervening
    valleys
 § Noise levels higher close to State Route (SR) 83, but
    relatively low more than a few hundred feet from SR 83
 § Background noise levels somewhat higher during
    periods with strong winds
 § Brief instances of moderately high noise levels (i.e. high
    wind, traffic, horns, activity near the meters)


                         Noise Study
Active Copper Mine Area Noise Monitoring

 § Unspecified active copper mine in Pima County,
   Arizona
 § Selected due to:
  • Accessible for study
  • Similar topography as proposed mine
  • Active mining activities with blasting, haul
    trucks, drilling, vehicle washing




                       Noise Study
Active Copper Mine Area Noise Monitoring

 § Noise levels monitored at same mine in May
   2008 and October 2008
 § Focused on blasting events but also general
   background noise levels and haul/drilling noise
   levels
 § Three blast events monitored with following
   charge sizes:
  • Two events 30 to 40 holes,
  • One event had 65 holes

                     Noise Study
Active Mine Area Noise Monitoring

 § Blast monitoring locations ¼ mile to one mile
  • One monitoring site: direct line of sight to blast
    areas with no terrain shielding
  • One monitoring site: terrain shielding from pit
    walls only
  • Other monitoring sites: terrain shielding from
    both pit walls and other terrain features




                     Noise Study
Schematic Diagram of Mine Area Monitoring




                  Noise Study
Noise Levels At Monitoring Site L10




                   Noise Study
Noise Levels At Monitoring Site L10




                   Noise Study
Noise Levels At Monitoring Site L10




                   Noise Study
Noise Levels At Monitoring Site L11




                   Noise Study
Noise Levels At Monitoring Site L12




                   Noise Study
Noise Levels At Monitoring Site L13




                   Noise Study
Noise Levels At Monitoring Site L13




                   Noise Study
Noise Levels At Monitoring Site L13




                   Noise Study
Noise Levels At Monitoring Site L14




                   Noise Study
Noise Levels At Monitoring Site L14




                   Noise Study
Noise Levels At Monitoring Site L14




                   Noise Study
Conclusions: Active Mining Area Noise Levels

 § Low overall noise levels
 § Average noise levels comparable to existing
   background noise levels in the Rosemont
   project area
 § Relatively high noise levels limited to the
   immediate vicinity of heavy equipment
   operations (active mining pit, haul roads, and
   active leach dump areas)



                      Noise Study
Conclusions: Active Mining Area Noise Levels

 § Blast events generated high noise levels for
   approximately one second
 § At distances > 3/4 mile from the pit area, blast
   noise levels comparable to ambient background
   noise levels
 § Maximum pass-by noise levels from haul trucks
   comparable to those for heavy trucks on
   highways
 § Minimum noise levels at the active mine lower
   than those monitored in the Rosemont project
   area

                     Noise Study
Questions

Robert Sculley
Bob.sculley@tetratech.com
530-756-3012

Michael Dieckhaus
Michael.dieckhaus@tetratech.com
520-297-7723




                            Noise Study

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Baseline Noise Study

  • 1. Noise Study For the Rosemont Copper Project By Robert Sculley & Michael Dieckhaus
  • 2. Purpose of the Noise Study § Identify existing background noise levels in the project area § Provide information on noise levels at active copper mines § Provide preliminary noise modeling analyses of traffic noise and blasting noise Noise Study
  • 3. Notes from the Noise Study § Noise modeling analyses have not been completed yet § This presentation will focus on the results from the ambient noise monitoring program Noise Study
  • 4. Background Noise Monitoring at Project Area § Multi-day noise monitoring at locations closest to existing residences § Multi-day monitoring at other locations representative of project area conditions § 5 locations in southern part of project area (closest to residences) monitored for a 3 day period over Memorial Day weekend Noise Study
  • 5. Background Noise Monitoring Approach § 1 location in the northern part of the project area (closest to residences) monitored for a 2 day period after Memorial Day weekend § 2 locations near the proposed mine pit area monitored for 2 days after Memorial Day weekend Noise Study
  • 6. Active Copper Mine Noise Monitoring Approach § Emphasis on monitoring blasting events at an active copper mine § First monitoring at 2 locations approximately one mile from a blast location § Several hours of monitoring to include background noise levels from haul trucks, shovel and other general mine activity Noise Study
  • 7. Active Copper Mine Noise Monitoring Approach § Supplemental noise monitoring at the same active mine included: • Two additional blast events • 3 locations at various distances from the blast • Two noise meters at each location, one running for 8 hours, the other running continuously for 48 hours Noise Study
  • 8. Active Copper Mine Supplemental Noise Monitoring § Locations of monitoring included: • At the edge of the pit with line-of-site to the blast locations (0.25 and 0.5 miles from the two blast sites) • 100 feet from the edge of the pit (0.25 and 0.5 miles from the two blast sites) • Along a haul road one mile from the blast sites, and close to a truck wash facility Noise Study
  • 9. Noise Monitoring Instrumentation § Two types of noise meters used for the study • Primary: Larson Davis model 820 sound level meters • Type 1 (precision) integrating sound level meter • Dynamic measurement range from 18 dBA to 110 dBA • Secondary: Center Technology model 322 sound level meters • Type 2 (general purpose) sound pressure level meter; not an integrating sound level meter • Auto-ranging with dynamic range from slightly under 30 dBA to 100 dBA Noise Study
  • 10. Larson Davis Model 820 Sound Level Meter Noise Study
  • 11. Center Technology Model 322 Sound Level Meter Noise Study
  • 12. Basic Field Procedures § Instruments set to A weighting, fast response § Larson Davis meters set to log one-minute basic time histories and 15-minute interval histories § Center 322 meters set to log data at one- second intervals or at 3-second intervals § Instruments mounted on camera tripods at a height of about 5 feet § Instruments calibrated with a Larson Davis Class 1 acoustic calibrator Noise Study
  • 15. Important Noise Measurement Terms § Leq = equivalent constant noise level ( energy- averaged noise level) § Ldn = day-night average noise level (a 24-hour Leq with a 10 dBA penalty factor added to nighttime [10 pm to 7 am] noise levels) § Lmax = maximum Leq over 1/8 second intervals at fast response setting; Lmax is how people hear rapidly fluctuating noise Noise Study
  • 16. Project Area Monitoring Locations SR 83 Noise Study
  • 17. Meter at Monitoring Site L1 Noise Study
  • 18. Noise Levels At Monitoring Site L1 Noise Study
  • 19. Noise Levels At Monitoring Site L1 Noise Study
  • 20. Meter at Monitoring Site L2 Noise Study
  • 21. Noise Levels At Monitoring Site L2 Noise Study
  • 22. Noise Levels At Monitoring Site L2 Noise Study
  • 23. Meter at Monitoring Site L3 Noise Study
  • 24. Noise Levels At Monitoring Site L3 Noise Study
  • 25. Noise Levels At Monitoring Site L3 Noise Study
  • 26. Meter at Monitoring Site L4 Noise Study
  • 27. Noise Levels At Monitoring Site L4 Noise Study
  • 28. Noise Levels At Monitoring Site L4 Noise Study
  • 29. Meter at Monitoring Site L5 Noise Study
  • 30. Noise Levels At Monitoring Site L5 Noise Study
  • 31. Noise Levels At Monitoring Site L5 Noise Study
  • 32. Meter at Monitoring Site L6 Noise Study
  • 33. Noise Levels At Monitoring Site L6 Noise Study
  • 34. Meters at Monitoring Site L7 Noise Study
  • 35. Noise Levels At Monitoring Site L7 – LD820 Noise Study
  • 36. Noise Levels At Monitoring Site L7 – C322 Noise Study
  • 37. Meter at Monitoring Site L8 Noise Study
  • 38. Noise Levels At Monitoring Site L8 Noise Study
  • 39. Meter at Monitoring Site L9 Meter at Monitoring Site L9 Noise Study 39
  • 40. Noise Levels At Monitoring Site L9 Noise Study
  • 41. Conclusions: Project Area Noise Levels § Low existing average noise levels in the project vicinity § Noise levels mostly less than 45 dBA § Noise levels higher on ridge lines than in intervening valleys § Noise levels higher close to State Route (SR) 83, but relatively low more than a few hundred feet from SR 83 § Background noise levels somewhat higher during periods with strong winds § Brief instances of moderately high noise levels (i.e. high wind, traffic, horns, activity near the meters) Noise Study
  • 42. Active Copper Mine Area Noise Monitoring § Unspecified active copper mine in Pima County, Arizona § Selected due to: • Accessible for study • Similar topography as proposed mine • Active mining activities with blasting, haul trucks, drilling, vehicle washing Noise Study
  • 43. Active Copper Mine Area Noise Monitoring § Noise levels monitored at same mine in May 2008 and October 2008 § Focused on blasting events but also general background noise levels and haul/drilling noise levels § Three blast events monitored with following charge sizes: • Two events 30 to 40 holes, • One event had 65 holes Noise Study
  • 44. Active Mine Area Noise Monitoring § Blast monitoring locations ¼ mile to one mile • One monitoring site: direct line of sight to blast areas with no terrain shielding • One monitoring site: terrain shielding from pit walls only • Other monitoring sites: terrain shielding from both pit walls and other terrain features Noise Study
  • 45. Schematic Diagram of Mine Area Monitoring Noise Study
  • 46. Noise Levels At Monitoring Site L10 Noise Study
  • 47. Noise Levels At Monitoring Site L10 Noise Study
  • 48. Noise Levels At Monitoring Site L10 Noise Study
  • 49. Noise Levels At Monitoring Site L11 Noise Study
  • 50. Noise Levels At Monitoring Site L12 Noise Study
  • 51. Noise Levels At Monitoring Site L13 Noise Study
  • 52. Noise Levels At Monitoring Site L13 Noise Study
  • 53. Noise Levels At Monitoring Site L13 Noise Study
  • 54. Noise Levels At Monitoring Site L14 Noise Study
  • 55. Noise Levels At Monitoring Site L14 Noise Study
  • 56. Noise Levels At Monitoring Site L14 Noise Study
  • 57. Conclusions: Active Mining Area Noise Levels § Low overall noise levels § Average noise levels comparable to existing background noise levels in the Rosemont project area § Relatively high noise levels limited to the immediate vicinity of heavy equipment operations (active mining pit, haul roads, and active leach dump areas) Noise Study
  • 58. Conclusions: Active Mining Area Noise Levels § Blast events generated high noise levels for approximately one second § At distances > 3/4 mile from the pit area, blast noise levels comparable to ambient background noise levels § Maximum pass-by noise levels from haul trucks comparable to those for heavy trucks on highways § Minimum noise levels at the active mine lower than those monitored in the Rosemont project area Noise Study