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Project Name Project Graphic

Public Meeting: Location January 31, 2007. Title page for audience. Project Name Project Graphic. Public Meeting: Location January 31, 2007. Blasting Operations Near Your Neighborhood. My name is: [Thank you for coming!!] I work for: My role is: You may contact me at:.

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Project Name Project Graphic

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  1. Public Meeting: Location January 31, 2007 Title page for audience • Project Name • Project Graphic

  2. Public Meeting: Location January 31, 2007 Blasting OperationsNear Your Neighborhood My name is: [Thank you for coming!!] I work for: My role is: You may contact me at:

  3. Who is in Charge? Contractor: Project Name: Project Contact: Phone Number: Contract/Permit number: [Company Logo]

  4. Who Will Oversee the Project? [Company Logo] • Inspection Company • Name • Address • Phone • Regulators (Federal, State, local) • Name • Address • Phone [Regulator Logo]

  5. Who will Conduct the Blasting? [Company Logo] • Company • Blaster • Address • Phone • Field office location • Preblast Survey Company (if any) • Name • Address • Phone [Company Logo]

  6. Who Will Evaluate the Blasting? • Blaster • Regulatory Agency • Engineers and/or Seismic Specialists • Name • Address • Phone • Qualified /competent personnel [Company Logo]

  7. Project Overview • Insert Project/Mine map or graphic or aerial photograph • Discuss the purpose • Discuss scope of work • Discuss potential blasting sites • All Companies Carry/Required Insurance

  8. Why is Blasting Necessary? • Discuss the project blasting • Other options considered • Ripping • Rock Hammer • Most Efficient • Most Effective

  9. How Will Blasting be Conducted? Safely with Modern Technology! Today’s Explosives are much safer than the old “dynamite and fuses” seen in old Hollywood movies We are professionals interested in sound blasting practices that will minimize impacts to you and your house

  10. How is a Blast Designed? • Holes will be drilled in a series of rows and loaded with explosives

  11. What are the Important Parts of a Blast? • The amount of explosives used in each hole • Stemming confines the energy to the ground and eliminates flying debris • All holes are connected and detonated independently • The individual detonations focus the energy on breaking rock and help control vibrations (ground and air)

  12. How Does a Blast Work?

  13. How Will Our Blasting Look? • Pick one or insert you own Blasting Video.

  14. How Blasting Looks in the Movies!

  15. Signage - For your safety! • Heed warning signals • Please keep off the project area

  16. What We do to Protect You! • Mark blast sites • Guard entrances • Block roads • Sound warning signals

  17. When Will Blasting Occur? • Schedule • Dates and times • Daylight hours only • Notification • Letters, door hangers, • Inform us of special needs • Warning Signals • Give Details

  18. Will I Feel the Blasting? • Probably • Ground Vibrations • Air Vibrations (Overpressure) • If vibrations reach your property, they will cause your house to shake • The amount of energy reaching your house is limited to prevent damage

  19. What are Blast Vibrations? • Wasted Energy • Elastic Motion • Transient • Come and go • Like Ripples in a Pond • Travel out in all directions • Less Energy with Distance • Size of the Stone (explosive charge) affects the wave size

  20. How Do Blasters Control Vibrations? • The vibration strength is dependant on: • Charge size • Distance from the blast • Vibration speed limits apply to all residential structures • Measure vibrations at the closest house for verification • Ground movements - in thousandths of an inch – Thickness of a piece of paper

  21. How Far will the Vibrations Travel? • Blast energy decreases rapidly with distance

  22. Ground and Air Vibration Limits • Ground Vibration Limit: • Air Vibration Limit: • Frequency considerations (road conditions) • Monitoring for this Project at: • Residential structure: • Other structure:

  23. Blast Vibration Monitoring • Blasting Seismographs • Outside the House • Ground Vibrations • Air Vibrations

  24. Where Will Monitoring Occur? • At the closest house • Must meet Project specifications or regulations at that location • [Add project map to facilitate discussion]

  25. Why use a Blasting Seismograph? • Show compliance with the project limits • Show compliance with the state limits • Aid in post blast assessment / quality control • Personnel performance • Product performance

  26. How do Blast Vibrations Affect My Home? • Vibrations: • Cause structures to shake • May be felt inside or outside • House Vibration May Cause: • Rattling of Contents • Annoyance • Startle • “Understanding Vibrations from Blasting ” • (Show now or after meeting)

  27. How Much Will My House Move? • House movements from blasting are measured in thousandths of an inch • Houses undergo similar displacements on a daily basis because of: • Environmental effects • Temperature changes • Humidity changes • Wind gusts • Man-made effects • People moving in the house • Nearby traffic • Stereo systems

  28. What is Pre-Blast Survey? • Home inspection prior to the start of blasting • Base line survey of the existing condition of your house • Notes • Pictures • Video • Identify any unusual conditions about your house to help us protect your property • While no damage to any structure is anticipated, if a claim is filed with us the pre-blast survey will be the base line for evaluating the claim

  29. Summary • Blasting will be done safely by competent professionals • Blasting will be designed and conducted to prevent damage to property outside the project area • Pre-blast surveys help us protect your property

  30. Summary • Vibrations are likely to be felt by nearby residents • Perception is not a reliable indicator of damage potential • If you have questions, do not hesitate to contact the professionals responsible for the project

  31. Our Goal As blasting professionals, we are interested in sound blasting practices that will minimize impacts to you and your house. Questions?

  32. Movies • Explosives: The Power Tool • Short version • Long version • Understanding Vibrations from Blasting

  33. The following slide are available for inclusion if needed.

  34. How Will Explosives be Transported and/or Stored? • US DOT rules • ATF rules • OSHA/MSHA rules • State regulatory authority • State Fire Marshall • Inspector and consultant oversight

  35. What about Explosive Security? • Security of utmost concern • When on-site, explosives will be continuously attended • No on-site storage over night

  36. Are There Other Possible Side Effects of Blasting? • Flyrock - • Fumes ------------------- • Dust ---

  37. What is Flyrock? • Defined As Any Material • Set in motion by the blast • Traveling through the air • Or along the ground • Beyond the project area • Not allowed to leave the project/mine site! • Will video tape for post blast assessment • If necessary, use mats to control

  38. What are Fumes? • A blast changes a solid or liquid substance into a gaseous substance • Most byproducts are not harmful • Nitrogen, Carbon dioxide, water • Exceptions: • Carbon monoxide • Nitrogen dioxide • May ask to place a gas sensor in your house

  39. Will Site Conditions Affect My Home? • If the site frequency matches house frequency • Structure resonate like a tuning fork • Structures have natural frequencies from about 4-12 Hz • Blasting frequencies can range from 2-150 Hz • Radio example – if off a few Hertz the channel is not clear • Perception within the house is not reliable indicator of regulatory compliance

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