| Summary and Recommendation | WNP Processing Plant Air Discharge Assessment | 4397169-66885702-113 | 16/06/2022 | 3 Sensitivity: General The dispersion of discharges from carbon generation stack are heavily influenced by building downwash. The stack also discharges horizontally from the side of the Processing Plant building which inhibits plume rise. Both factors appear to have greater impact on ground level concentrations compared to the velocity and temperature of the discharge. Table D2. Summary of predicted annual average mercury concentrations (µg/m3) for the Sensitivity Model emission scenarios Receptor Sensitivity Model -Scenario 1 (existing) (µg/m3) Sensitivity Model -Scenario 2 (proposed) (µg/m3) 1 0.0215 0.0087 2 0.0229 0.0093 3 0.0199 0.0084 4 0.0178 0.0081 5 0.0130 0.0059 6 0.0134 0.0052 7 0.0143 0.0065 8 0.0123 0.0060 9 0.0161 0.0062 10 0.0114 0.0044 11 0.0085 0.0036 12 0.0095 0.0039 13 0.0100 0.0041 Assessment Criteria 0.33 µg/m3 - NZAAQG 0.3 µg/m3 - USEPA RfC 0.2 µg/m3 - ATSDR MRL 0.03 µg/m3 - OEHHA REL
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