alex grant
DESCRIPTION
Dust from Mineral and Waste sitesTRANSCRIPT
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IAQM – Assessing dust impacts
of minerals and waste sites
A qualitative assessment technique
Alex Grant, DustScan Ltd
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My details
• Chartered Mining Engineer (1978)
• MSc, Marine Environmental Protection (1992)
• Founding Partner, Smith Grant LLP (1993)
• Sole trader, Alex Grant AirQ (2009)
• Associate Consultant, DustScan (2012)
• Numerous dust assessments over past 20 years
• Developed risk assessment methodology
• Attended committees to update PGNs (2012)
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Proposed development
• Hard rock / sand and gravel
• Size and nature of site
• Method of working
• Haulage and transport
• Ancillary processes, eg
– Crushing and screening
– Concrete batching
– Roadstone coating
– Aggregates recycling
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Site setting - 1
• Initial assessment – Maps / plans
– GoogleEarth (may be out of date)
– Rural / urban
• Site visit – Site operations (for extension sites)
– Review permits / monitoring data / complaints
– Application site
– Surrounding area
– Topography
– Soils and geology
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Site setting - 2
• Identify sensitive receptors, within
– 250m for small or sand and gravel sites
– 500m (or more) for large hard rock sites
– 1000m for PM10
• Assess distances / directions to receptors
• Screening
– Existing woodland and hedges
– Advance planting
• Other dust sources
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Example site
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Sensitive receptors
Property Working
Area
Distance Direction to
workings
Screening
XXXX Road (NW) Phase 3 140m SW → W unscreened
XXXX Road (S) Phase 3 140m W → NW effective
XXXX House Phase 2 190m W partial
Phase 3 110m W → NW partial
XXXX Cottages Phase 1 70m N → NE partial
Phase 2 150m NE partial
Haul route 250m NW → NE partial
XXXX Farm Phase 1 80m E → S effective
Phase 2 240m E → SE effective
Phase 3 220m E effective
Haul route 250m SE → SW effective
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Environmental setting
• Wind speed and direction data
• Air Quality
– Local dust regime
– LAQM data
– LAQM reports
• Site-specific monitoring data (if available)
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Wind rose WIND ROSE FOR MARHAM N.G.R: 5736E 3090N ALTITUDE: 21 metres a.m.s.l.
KNOTSSEASON: ANNUAL Period of data: Jan 2002 - Dec 2011
87034 OBS.
0.3% CALM
0.0% VARIABLE
1-10
11-16
17-27
28-33
>33
0%
20%
10%
5%
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Indicative risk assessment matrix
from: A Guide to Risk Assessment and Risk Management
for Environmental Protection, DoE, 1995
Probability Magnitude of the Consequences
Severe Moderate Mild Negligible
High high high medium /
low
near zero
Medium high medium low near zero
Low high /
medium
medium /
low
low near zero
Negligible high /
medium /
low
medium /
low
low near zero
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Magnitude of impact (large site)
Screening
Source – Receptor Distance
0–50m 50–100m 100–250m >250m
None or
ineffective
severe severe moderate mild
Partially
screened
severe moderate mild negligible
Fully
screened
moderate mild negligible negligible
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Magnitude of impact (small site)
Screening
Source – Receptor Distance
0–50m 50–100m 100–250m >250m
None or
ineffective
severe moderate mild negligible
Partially
screened
moderate mild negligible negligible
Fully
screened
mild negligible negligible negligible
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Probability of dust impact
Frequency of Winds Probability of Impact
<3% negligible
3 – 10% low
11 – 20% medium
>20% high
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Example site
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Estimated risks (no mitigation)
refer to Appendix 1 Property Working Area Estimated risks
Fugitive Wind blown
XXXX Road (NW) Phase 3 high medium
XXXX Road (S) Phase 3 near zero near zero
XXXX House Phase 2 low low
Phase 3 medium / low low
XXXX Cottages Phase 1 medium medium / low
Phase 2 low low
Haul route medium / low low
XXXX Farm Phase 1 medium / low low
Phase 2 near zero near zero
Phase 3 near zero near zero
Haul route near zero near zero
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Mitigation
• Environmental Permit (if applicable)
• Process Guidance Note
• Published best practice guidance
• Essence of guidance is that dust can be
controlled by effective site management
• Measures may be embodied in dust
management and monitoring scheme
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Effect of mitigation
• Effective mitigation is likely to reduce the
magnitude of any impacts, ie:
– “severe” impacts become “moderate”
– “moderate” impacts become “mild”
– “mild” impacts become “negligible”
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Estimated risks (after mitigation) refer to Appendix 2
Property Working Area Estimated risks
Fugitive Wind blown
XXXX Road (NW) Phase 3 medium / low low
XXXX Road (S) Phase 3 near zero near zero
XXXX House Phase 2 near zero near zero
Phase 3 near zero near zero
XXXX Cottages Phase 1 low low
Phase 2 near zero near zero
Haul route near zero near zero
XXXX Farm Phase 1 near zero near zero
Phase 2 near zero near zero
Phase 3 near zero near zero
Haul route near zero near zero
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Other considerations
• Cumulative impact – can be assessed
using similar methodology
• PM10 – outside the scope of this
presentation
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Outcome
• Planning permission obtained for new sites and for extensions
• In appeals against refusal, assessments have been presented at Public Inquiries, generally without significant challenge
• Unaware of regulatory action against any quarry assessed as described in conjunction with dust management scheme