Document ExEG2V5xpnNOjG4x5GazRD97L

AR226-2641 AR226-2641 DuPont Modeling M ethodology and Results DRAFT Shimizu Site June 2003 About the Model I Industrial Source Complex Short Term 3 (ISCST3) I Sold/used globally, including in Japan http://www.phoenix-r.co.jp/products/products.htm I Input l Stack height, diameter I Flowrate, temperature I Mass of pollutant (kilogram per hour) I Local meteorological data (Shizouka 1997, 98, 99) 1 Output l Ambient air concentrations in ug/m3 I Max values and locations outside the property line Prevailing wind ai i i w i Facility Vapor reaches ground level Ambient annual ground level concentration in ug/m3 Model Calculations I Ambient air concentrations based on Gaussian Equation I Concentration a function of a vertical term and a dispersion term I Vertical term based on stack height, receptor elevation, plume rise, mixing 1 Dispersion parameters describe distribution of pollutant in lateral and vertical Shim izu M odeling Inputs Stack Param eters Source ID 2 3 4 Description Location Operations Beiahi. m Diameter, m Flowrate m3/hr Pre-scrubber exit for Tine powder Operates 24 hours scrubber (called *AC Scrubber* on mao) D Plant per day. 180 days per year 8 0.68 2400 Post-scrubber exit for fine powder Operates 24 hours scrubber (called `A C Scrubber* on per day. 180 days mao) D Plant per year Operates 24 hours 15 0.6 9600 E Plant: copolymer per day, 270 days D BC Scrubber plant for P F A and F E P per year 18.2 0.6 1620 M P-2 building: Operates 24 hours M P-2 scrubber copolymer type micro- per day, 200 days oowder per year 16.1 10.6 assumed 7500 / ' S7*----- ^ / (1) Given in email o f 4/17/03 from Hie etaka Hiromatsu: 600 s a mm square diameter. Converted to effective diameter of 0.66 meters. Temp 100 c 40-50 C 40 C 40 C assumed Correct stack height? Shim izu M odeling Inputs Em issions Rates Source ID i Description iPre-scnibber exit for fine powder scrubber (called "AC Scrubber 1 on map) Location D Plant Emission Rate, Emission kg/hr Rate, g/s 0.24 0.0667 iPost-scrubber exit for fine powder scrubber (called "AC 2 Scrubber" on map) D Plant 0.24 3 DBC Scrubber E Plant: copolymer plant for P FA and F E P 0.07 0.0667 0.0194 4 MP-2 scrubber MP-2 building: copolymer type micro-powder 0.125 0.0347 Prelim inary M odeling R e s u lts I Maximum annual concentrations calculated as 14 ug/m3 I Point of maximum concentration at south boundary of site (on property line) Contribution of Sources : Source ID i1 i2 :3 I4 Description i Pre-scrubber exit for fine !powder scrubber (called ;"AC Scrubber" on map) IPost-scrubber exit for fine jpowder scrubber (called j"AC Scrubber" on map) ^ Location D Plant D Plant Contribution, Height, m ug/m3 Contribution 8 7.002! 50 15 3.345: 24 !DBC Scrubber ;MP-2 scrubber E Plant: copolymer plant for P F A and F E P MP-2 ixiilding: copolymer type micro- 18.2 16.1 2.953 0.771 total = 14.071 21 5