Guidance on the Assessment of Mineral Dust Impacts for Planning 2016

1. Determining
Residual Source Emissions
1
Dr Srinivas Srimath

2. IAQM Guidance on Mineral Dust
What do we mean by
Residual Source Emissions?
• Emissions after accounting for the designed-in mitigation
• Evaluated for each operational activity, for each zone
• Emissions magnitude can be Small/Medium/Large
• Examples are provided for all seven activities (Refer to Section
6.2.1 of the Consultation Document)
• Not prescriptive; Decision is left to the professional judgement
2RSK Environment Ltd

3. Designed-in Mitigation
• Design Measures (Table 4, Section 7 of the
Consultation Draft)
• Operational Measures (Table 5, Section 7 of the
Consultation Draft)
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4. Activity: Site Preparation/Restoration
4
Magnitude of Residual Source Emissions
Large Medium Small
Large working area (>10ha)

Small working area (<2.5ha)
High bunds (>8m) Low bunds (<4m)
High volume of material movement
(>100,000 m3)
Low volume of material movement
(<20,000m3)
High number of heavy plant (>10
numbers)
Low number of heavy plant (<5
numbers)
Bunds: Minimal seeding/sealing Bunds: Seeded/sealed immediately
Material of high dust potential (Fine
grained and friable material)
Material of low dust potential (high
moisture content material)
RSK Environment Ltd

5. 5
Activity: Mineral Extraction
Magnitude of Residual Source Emissions
Large Medium Small
Large working area (>100ha)

Small working area (<20ha)
Drilling and blasting frequently used Low energy extraction methods (for
example, use of hydraulic
excavators)
Material of high dust potential
(Small particle and low moisture
content)
Material of low dust potential
(Coarse material and/or high
moisture content)
High extraction rate (>1 million
tonnes per annum)
Low extraction rate (<200,000
tonnes per annum)
RSK Environment Ltd

6. 6
Activity: Material Handling
Magnitude of Residual Source Emissions
Large Medium Small
High number of heavy plant near to
the site boundary (>10 numbers of
loading plant)

Low number of heavy plant (<5
numbers of loading plant)
Unconsolidated/bare surface (dry,
poorly surfaced ground)
Clean hard standing surface
Activities close to the boundary
(within 50m of a site boundary)
Activities within the quarry void
(more than 100m of a site
boundary)
Material of high dust potential
and/or low moisture content
Material of low dust potential
and/or high moisture content
RSK Environment Ltd

7. 7
Activity: On-site Transportation
Magnitude of Residual Source Emissions
Large Medium Small
Use of unconsolidated haul roads

Use of conveyors
Unpaved haul roads Paved haul roads
Road surface of high dust potential Road surface of low dust potential
High total length of haul roads Low total length of haul roads
High number of HDV movements
(>250 movements in a day)
Low number of HDV movements
(<100 movements in a day)
Uncontrolled vehicle speed Controlled low vehicle speed (a
maximum of 15 miles per hour)
RSK Environment Ltd

8. 8
Activity: Mineral Processing
Magnitude of Residual Source Emissions
Large Medium Small
Mobile plant (mobile crusher and
screener with on-site concentre
batching plant)

Fixed plant
Raw material of high dust
potential, low moisture content
(for example, hard rock)
Raw material of low dust
potential, high moisture content
(for example, wet sand and gravel)
End product of high dust potential End product of low dust potential
Complex or combination of
processes
Single process (for example, fixed
screening process)
High volume of material processed
(> 1 million tonnes per annum)
Low volume of material processed
( <200,000 tonnes per annum)
RSK Environment Ltd

9. 9
Activity: Stockpiles/Exposed Surfaces
Magnitude of Residual Source Emissions
Large Medium Small
Long-term stockpile (>12 months)

Short-term stockpile (<1 month)
Frequent material transfer (daily) Infrequent material transfer
(weekly)
Material of high dust potential Material of low dust potential
Ground surface unconsolidated/ un-
kept
Hard standing clean ground surface
Stockpiles close to the site boundary
(<50m)
Stockpiles well within quarry void
(>100m from a site boundary)
Large areas of exposed surfaces
(>10ha)
Small areas of exposed surfaces
(<2.5ha)
High wind speeds/low threshold for
dust
Low wind speeds/high dust
threshold
RSK Environment Ltd

10. 10
Activity: Off-site Transportation
Magnitude of Residual Source Emissions
Large Medium Small
High number of HDV movements
(>200 movements)

Low number of HDV movements
(<25 movements)
Unconsolidated access road Paved access road
Small length of access road (<20m) Large length of access road (>50m)
No road sweeper available Employment of an effective road
sweeper
Limited/No vehicle cleaning
facilities
Extensive vehicle cleaning facilities
RSK Environment Ltd

11. 11
Next steps
• The magnitude of Residual Source Emissions for each
operational activity, for each zone is summarised.
• S-P-R is established.
• Assessment is carried out to identify the potential dust
disamenity effects at specific receptor locations.
• Depending on the significance of dust effects, additional
mitigation measures are identified where necessary.
RSK Environment Ltd