Document kYdkYLvpqKM1YeBb8L359xvE

AR226-2192 Ta-Wei Fu 08/27/2001 11:34 PM To: Stephen J Gissy/AE/DuPont@DuPont, Oscar T Garza/AE/DuPorrt@DuPont, Fred M Lentz/SE/DuPont@DuPont, Robbin Banerjee/AE/DuPont@DuPont, Paul K Mathur/CL/DuPont@DuPont, David M Rurak/AE/DuPont@DuPont, Raymond C Butterworth/CL/DuPont@DuPont, John R Flynn/AE/DuPont@DuPont, Amy L Brown/AE/DuPont@DuPont, Thomas W Mahlberg/SE/DuPont@DuPont cc: Robert F Pinchot/DEV/AE/DuPont@DuPont, Chris E Shoop/AE/DuPont@DuPont, Roger J . Zipfel/AE/DuPont@DuPont, Alvin H Gibson_Jr/CL/DuPont@DuPont, Debbie J MuIrooney/AE/DuPont@DuPont Subject: ACTION ITEMS FROM APFO DISPERSION MODELLING ' In our Nelm eeting today on the dispersion m odeling, several cases were run based on the forecasted A P F O consumption fo r year 2 0 0 3 at W W . T he modelling results indicate that w e need to do the followings in order to m eet th e C E G requirement. 1. The APFO rem oval efficiency for the Fine Pow der dryer air scrubbing system has to be at least 85% . (Being addressed by W 2 project) 2. T he APFO rem oval efficiency for all dryer vents from FEP and P F A areas has to be at least 93% . (Being pursued by 6 -S ig m a /W 7 project) 3. T he vent stacks o f all the A P F O scrubbing system s need to be increased by 2 0 -3 0 ft. The modelling results of concentration contour are significantly affected by the increasing slack height. W e need to start the work on evaluating options and cost for stack height increase as soon as possible in order to m eet the timing fo r implementation during the April shutdown in 2 0 0 2 . T h e stack height for the scrubbing system in the Fine Powder area can be added to the-current W 2 project. T h e stack height for FE P and PFA areas need to be worked on separately. I would like to have your concurrence and guidance on the proposed action items below: 1. Increase the stack height in the on-going W 2 project by 2 0 -3 0 ft. (Include this in th e current . production design being pursued with JBEK Charleston) 2. Pursue feasibility evaluation and cost estim ate to increase the stack height for F E P and PFA vents by at least 20ft. I will follow up with Al Gibson to find a economical and quick approach to get this work started with JBEK Charleston. Your feedback are appreciated. Ta-W ei EXD257616