Document g2oqemE5e2g7xVBNwyqgVx4QJ

AR226-2272 xcr""" ^f :-- 9' Dabbie J Mulrooney 04/10/2002 10:22 AM To: cc: Subject: Catherine A Barton/AE/DuPont@DuPont Wash Works C8 Max Concentration Cathie, You asked me the other day for the maximum concentration value for the Washington Works C8 modeling. I'm not quite sure if you are loota'ng for the maximum concenfrafion wilhin the Little Hocldng 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 well watershed. So, 1will give you both. Note that as I told you ths other day, the C8 emissions are in both the paniculate and vapor phase, hence, I had to do 2 separate model runs, and add the Iwo together to get the maximum concentration. You are probably only Interested in the total: Little Hocking well watershed area Maximum ground-level concentration (parttoulate) = 0.389 ug/m3 Maximum ground-level concentration (vapor) = 0.716 ug/m3 Maximum ground-level concentration (total) =1.105 ug/m3 Entire Area Modeled (maximum occurs on plant fenceltne) Maximum ground-level concentration (particulate) =; 1.087 ug/m3 Maximum ground-level concentration (vapor) =1.707 ug/m3 Maximum ground-level concentration (total) =2.794 ug/m3 CAB000093 EID546942