Document jmdNMbVn14j7MjBGJpVQpaN1Z

AR226-2310 Charles J Zarzecki 03/13/2003 11:02 AM To: Catherine A Barton/AE/DuPont cc: Subject: Re: Our stance on actual sampling Q C a th ie , Actual sampling w ill show low er numbers. The IS C model is conservative, som etim es by 2X . There are other models too, such as A ER M O D , which dial-in m ore o f the microm eteorological effects of a given area, and may be less conservative. Charlie Z. Catherine A Barton 4? Catherine A Barton ' 03/13/2003 10:56 AM To: Charles J Zarzecki/AE/DuPont@DuPont cc: Subject: Our stance on actual sampling C h arlie , 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 w ill com pare 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