Document O1rGe5V11YmLxDk34naJ03aE1

AR226-2152 4oO3 t *T--I Ph P S) t o> Ph RP026176 EXD476984 # Steve Swearingen Cathie Barton, DuET Debbie Mulrooney, DuET Tim Bingman, CRG w ow <Ti v] -0 EXD476985 Chronic Off-Site g ii I Purpose: Identify the design parameters required so that the average daily concentration off-site is below the CEG and on-site is less than the AEL - Emission rate - Stack Height - Stack Height/building height ratio - Dilution Air flow Model used: Industrial Source Complex (ISC v.3); a model used by EPA for air toxics permitting Results shown are using RDU meteorology data; FAY data available this week; model results will be updated. RP026178 m cO o a OmoII T&S GO ro RP026179 EXD476987 1 With reasonable design parameters, the maximum yearly average concentration expected to exist off-site, with ZERO ABATEMENT of process vents and fugitive emissions is 10-30% of the CEG of 0.3pg/m3 All process vent streams will be scrubbed with expected high efficiency (>90%, | possibly >99.5% (ft H EID476989  Update model with FAY data when available Document model results including assumptions Expand model to determine wet and dry deposition. o to p CO N> EXD476990