HAZARD ANALYSIS & RISK ASSESSMENT Final
APPENDIX 5 HAZARD ANALYSIS AND RISK ASSESSMENT Hazard Identification: Only those activities that will experience some change are included in the hazard analysis following: Activity
Frequency
Equipment
Hazards
Stockpile construction
Some activity on the raw product stockpiles will occur daily.
Dozer, excavator, dump trucks, wheel loader.
Adding makeup water to settling ponds
When required (weekly)
Small dedicated diesel pump
Raw materials processing
It is likely that the screener/washer will be operated 3 days per week.
Mobile screener / washer, wheel loader, excavator.
• • • •
Loading out from stockpiles and transport
It is likely that cartage contractor will transport product most working days.
Wheel loader, on road truck and trailer combinations.
• • • • •
• • • • • •
Excessive noise impact on neighbours. Excessive dust impact on adjacent vegetation and visual impact. Hydrocarbon spill to ground or water course. Stockpiles slump through poor placement or steep side slopes. Runoff from stockpiles cause siltation in natural vegetation Makeup water pump left operating for extended period will cause settling ponds to overflow, discharge to sediment retention basin and finally to water impoundment. Excessive dust impact on adjacent vegetation and visual impact. Hydrocarbon spill to ground or water course. Fixed washing plant noise nuisance to neighbours. Contaminated water discharge to receiving environment from settling ponds. Soil erosion and sediment discharge into natural water courses Hydrocarbon spill to ground or water course. Excessive speed causes dust and noise emissions (engine brakes). Inadequately covered or damped loads cause dust impact. Trucks from other areas provide a vector to spread weeds into the native vegetation on and adjacent to the site.
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Integrated Land Management and Planning | Appendix 5 Hazard Analysis and Risk Assessment
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HAZARD ANALYSIS & RISK ASSESSMENT Final
TABLE OF RISK ASSESSMENT Likelihood A Almost certain
Event expected in 12 month period
Consequence 1 Insignificant
B
Likely
Event likely to occur in 12 month period
2
Minor
C
Possible
Event may occur (but not likely) in 12 month period
3
Moderate
D
Unlikely
Event not expected in 12 month period
4
Major
E
Rare
Event extremely unlikely to occur in a 12 month period
5
Extreme
F
Extremely rare
May only occur in extreme and exceptional circumstances over a 12 month period
6
Catastrophe
Negligible or no environmental harm or nuisance e.g. • Contained oil spill <20 litres. • Incidental and local impact on flora and fauna. Material environmental harm or nuisance, but prosecution unlikely, local publicity only, local nuisance impacts on community e.g. • Technical breaches of legal requirements regardless of harm or nuisance. • Spills to waterways <100 litres where dispersal/cleanup is simple. Serious environmental harm, possible prosecution, local state publicity possible temporary permit and lease restrictions e.g. • Significant oil spill (4000 litres to land, >100 litres to water). • Ecosystem impact requiring expert remedial action and follow up. Serious environmental harm, prosecution probable, national publicity, reputation impacts, probable temporary permit and lease restrictions e.g. • Significant ecosystem impact with residual effects after follow up. Serious environmental harm, prosecution certain, severe reputation impact, national publicity, probable permanent permit and lease restrictions e.g. • Significant impact on regional ecosystem, with significant residual effects likely. Serious environmental harm, prosecution certain with jail terms, permanent damage to reputation, certain loss of permit and mining lease e.g. • Significant and permanent impact on regional ecosystem.
Integrated Land Management and Planning | Table of Risk Assessment
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HAZARD ANALYSIS & RISK ASSESSMENT Final
RISK ASSESSMENT MATRIX Likelihood A B C D E F
1 Insignificant Low Low Low Low Low Low
Almost certain Likely Possible Unlikely Rare Extremely rare
2 Minor Moderate Moderate Low Low Low Low
3 Moderate High High Moderate Low Low Low
Consequence 4 Major Extreme Extreme High Moderate Low Low
5 Extreme Extreme Extreme Extreme High Moderate Low
6 Catastrophe Extreme Extreme Extreme Extreme High Moderate
RISK LEVEL ACTION TABLE Risk rating Action
Low Acceptable, activity can proceed, with controls.
Moderate Quarry Manager to assess efficacy of controls and authorise activity.
High SHE Manager to assess efficacy of controls and authorise activity.
Extreme Unacceptable, activity cannot proceed.
HIERARCHY OF CONTROLS 1 2 3 4 5 6
Control Eliminate Substitute Isolate Engineer out Administrate Response equipment
Example Don’t proceed with activity or fundamentally rework activity to remove hazard. Introduce alternative activity with lower risk rating. Install permanent design features to protect against hazard. Change equipment used or introduce features to lower risk rating e.g. improved silencers on equipment. Reinforce active controls through documented work procedures and toolbox meetings. Provide workers with equipment to reduce severity of consequences e.g. hydrocarbon spill kits.
Integrated Land Management and Planning | Risk Assessment Matrix
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HAZARD ANALYSIS & RISK ASSESSMENT Final
RISK ASSESSMENT Hazard
Excessive noise impact on neighbours.
Likelihood / Consequence
Risk rating
Controls
A/3
High
• •
Excessive dust impact on adjacent vegetation and visual impact.
A/2
Moderate
Soil erosion and sediment discharge into natural water courses.
A/3
High
• • • • • • • • • •
Hydrocarbon spill to ground or water course.
B/3
High
• • • • •
Screener / washer located low in pit with screening terrain and forest surrounding (3) Modern quiet equipment for material processing (4) Self-imposed speed limit, slow vehicle speeds (5) Introducing washing will lower dust emissions (4) Use water cart and sprays on windy days (6) Self-imposed speed limit, slow vehicle speeds (5) Settling ponds with redundant capacity, designed to not discharge up to 1 in 20 year event (3) Continue with progressive rehabilitation (3) Install cut off drains up slope of disturbance (4) Clean out sediment retention basins regularly (4) Construct defined drainage paths separate from traffic paths and maintain to high standard (4) Moderate slope on stockpiles and windrows (5) Use modern well maintained equipment (4) Maintain defined drainage paths separate from traffic paths (4) Reinforce accidental spill procedures (5) Have spill kits on hand at all times (6)
Integrated Land Management and Planning | Risk Assessment
Risk rating with control (D / 3) Low
(D / 2) Low
(D / 4) Moderate
(D / 3) Low
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HAZARD ANALYSIS & RISK ASSESSMENT Final
Hazard Weed and disease spread into natural vegetation.
Likelihood / Consequence C/4
Risk rating
Controls
High
• •
Drainage paths affected causing ponding.
C/3
Moderate
• •
Keep ‘off site’ trucks out of the main extraction and processing areas where weed incursions could occur (4) Maintain defined drainage paths separate from traffic paths (4) Maintain defined drainage paths separate from traffic paths (4) Reinforce procedures and frequency for cleaning sediment basins and drains (5)
Integrated Land Management and Planning | Risk Assessment
Risk rating with control (D / 3) Low
(D / 3) Low
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