General Guidance on Generic Source Categories of Potash Sector and the NPRI Emission Estimate Codes

Table 1: Generic Source Categories of Potash Sector and the NPRI Emission Estimate Codes
Source IDSourceCategoryEmission Quantification Method currently used by the SectorRecommended Emission Quantification MethodRecommended NPRI Emission Estimate Codes for the Reporting 
Main StackDryer StackStack or pointM3 + SPPA Correction Factor (PM10 and PM2.5 only)M3 (wet source testing method, with other estimating tools as appropriate)M3 (with the use of SPPA correction factor to be mentioned in "Comments” field)
Fluid Bed DryerDryer StackStack or point
Rotary DryerDryer StackStack or point
Product CoolerDryer StackStack or point
PrecipitatorDryer StackStack or point
OtherDryer StackStack or point
CompactionDust StackStack or pointM3, O, E1 (assumes definition = Manufacturer Spec)M3 (U.S. EPA method 201A for PM 2.5 filterable particulates)M3   
ReclaimDust StackStack or point
LoadoutDust StackStack or point
Raw Ore ScreenDust StackStack or point
Dispatch BeltsDust StackStack or point
Blending binDust StackStack or point
Dust CircuitDust StackStack or point
Crushing and transferDust StackStack or point
Sizing & CompactionDust StackStack or point
Transfer houseDust StackStack or point
Dust slurry tankDust StackStack or point
OtherDust StackStack or point
Powerhouse BoilersExhaust stackStack or pointE2 (CGA), US EPA Fire Database & NPRI liquid fuel calculatorE2 (CGA calculator for natural gas & NPRI calculator in the Toolbox for liquid fuels)E2
Standby GeneratorExhaust stackStack or pointE2 (US EPA42)E2 (NPRI calculator in the Toolbox for liquid fuels - Diesel Engines)E2
Mine ExhaustMine ExhaustStack or pointM3, O, E2 (NPRI Calculator) O or E2
Natural Gas Combustion – Misc (small heaters or not accounted for in powerhouse boilers & dryers)Natural Gas CombustionStack or point, other non-pointE2 (CGA) & US EPA Fire DatabaseE2 (CGA calculator for natural gas)E2
Fuel combustion - Propane Heaters other non pointE2 (NPRI Calculator)E2 (NPRI calculator for propane heaters in the Toolbox)E2
Rock trucks, pickups road dustE2 (NPRI Calculator)E2 (NPRI calculator for unpaved industrial road dust in the Toolbox)E2
Unpaved roads road dust
Construction road dust
Earthwork Construction other non pointE2 (Construction Factors?)Refer to AP-42 Chapter 13.2.3 (Table 13.2.3-1 Sections I and II). Road dust is excluded since it is considered under other Source IDsE2
Fugitive EmissionFugitive Emission (includes wall fans, loading dust not captured by dust emission control equipment, storage buildings, etc)Fugitive EmissionE1 (SPPA), O (SPPA)E1 (SPPA)E1

Basis of Estimate Codes - NPRI

M1 - Continuous Emission Monitoring
NA - Not Applicable
M2 - Predictive Emission Monitoring
NI - No Information Available
O - Engineering Estimates
E1 - Site Specific Emission Factors
M3 - Source Testing
E2 - Published Emission Factors
C - Mass Balance


b) General Guidance on the Use of the NPRI Emission Estimation Codes for the Potash Industry

There are four emission estimation codes commonly used by the potash- producing facilities for reporting the PM data to the NPRI, namely: source testing (M3), site-specific emission factors (E1), published emission factors (E2), and engineering estimates (O).

M3” is a measurement method involving the determination of the concentration of one or more substances, i.e. TPM, PM10, and PM2.5 in the case of potash sector.  The concentration of each substance is then multiplied by the volumetric flow rate to determine the quantity of the substance released over time. This quantity can be divided by throughput to get an emission per unit production or it could be multiplied by hours of operations to calculate an annual emission. Facility owners/operators should report the data based on this one set of source testing results normally conducted for the purposes of demonstrating compliance with a regulatory requirement, or guidance provided by regulatory authorities.  

When the source sampling tests are performed many times for the same source at a facility, facility owners/operators should develop their own site-specific emission factors which are used to relate to the quantity of substance(s) released from that source to some common activity (e.g. the volume of product produced in a defined period of time). These site-specific emission factors “E1” could then be used for data reporting purposes for the particular facility. 

E2” is meant to be used when the emission factors are developed based on a large number of source testing results from one or more facilities for the same industry sector, or for the same type of process equipment (e.g. fuel combustion equipment), and are published by the industry associations or the government agencies to make the information readily available for use by the industry sector or the particular jurisdiction.

O” is an estimation method involving the use of knowledge on physical and chemical processes, equipment design properties, as well as engineering principles for the related calculation of pollutant releases from an emission source.  This method is generally the least desirable to use since the data results are usually of gross approximation. However, as long as there would be further refinement whenever better data become available, this is sometimes the best approach to adopt when no other estimation method is readily available.      

Environment Canada recommends that consistent methods be used to estimate emissions of pollutants for the same emission sources among the different potash-producing facilities, and such methods be specified. 

Furthermore, standard quantification techniques used to estimate the emissions should be referenced, and any related documentation should be readily made available to the public.  

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