Document NezRgNwde3ymO6JVg4vb4N6Jp

AR226-2310 y Charles J Zarzeckl 03/13/2003 11:02 AM To: cc: Subject: Catherine A Barton/AE/DuPont Re: Our stance on actual sampling Q Cathie, Actual sampling wilt show lower numbers. The ISC model is conservative, sometimes by 2X. There are other models too, such as AERMOD, which dial-in more of the micrometeorological effects of a given area, and may be less conservative. Chariie Z. Catherine A Barton ^ Catherine A Barton 03/13/2003 10:56 AM To: cc: Subject: Charles J Zarzecki/AE/DuPont@DuPont Our stance on actual sampling Chanie, I think you and I ought, to think hard about what our position is on these guys getting community or fenceline samples. Do you know of any sampling work that Dupont, EPA or others have done on the ISC model in the past? I'm wondering if we have any intuition about how the sampling data will compare to the modeled data. Also, I think I'll start asking questions of PJ and others about the cost associated with actual monitoring. -C EID747619