Document Lp63jEBOo9095QqzK9mgZeodX

AR226-2272 r~ .1... Debbie J Mulrooney i. 04/10/2002 10:22 AM To: Catherine A Barton/AE/DuPor>t@DuPont cc: Subject: Wash Works C8 Max Concentration C a th ie , You asked me the other day for the maximum concentration value for th e W ashington Works C 8 modeling. I'm not quite sure if you are looking for the maximum concentration within the Little Hocking watershed (where I did the deposition calc's), or the maximum concentration overall, which is on the plant fenceline, and is not in the Little Hocking welt watershed. So, I will give you both. Note that as I told you the other day, the C 8 emissions are in both the particulate and vapor phase, hence, I had to do 2 separate model runs, and add the two together to get the maximum concentration. You are probably only interested in the total: Little Hockino w ell w atershed area Maximum ground-level concentration (particulate) - 0.389 ug/m 3 Maximum ground-level concentration (vapor) = 0.716 ug/m3 Maximum ground-level concentration (total) = 1.105 ug/m3 Entire Area M odeled /maximum occurs on plant fenceline) Maximum ground-ievel concentration (particulate) = 1.087 ug/m 3 Maximum ground-ievel concentration (vapor) = 1.707 ug/m3 Maximum ground-level concentration (to ta l)= 7 9 4 ug/m3 CABO0 0 0 9 3 EXD546942