From:	Ziman, Steve - <SDZI@chevron.com>

To:	RTP3.RTMU540(sanders-dave)

Date:	10/9/96 2:57pm

Subject:	FACA Issue papers -Forwarded

FROM: Ziman, Steve -SDZI

DATE: 10/09/96 11:53

TO: DAVE8 ION/INTERNET

CC:

SUBJECT: FACA Issue papers -Forwarded

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David

I am not sure that I will be on the call, as tomorrow is my day off.

However, in response to the e-mail, both with respect to how Tom Moore wrote it and also my prior e-mail on this subject. I believe almost none of the major categories of scientific/technical issues are now available, nor will they be available in two years. Certainly the emissions inventory with respect to fine particles and their precursors is very questionable in most of the US, and it will not be much more accurate in that time frame. Much of the same informtion is needed for PM, and we don't have some basic information now. Similarly, if one is to use models which can relate precursor pollutants to fine PM and calculate visibility improvements with change in the inventory, that is still a long way off with respect to having a sufficient data base to even evaluate the models. Beyond that is need for area specific data to support modeling. I do not believe that the Lagrangian approach is sufficient to carry out assessments. There is need to do data analysis to understand where and when visibility is degraded, and what are the associated meteorological conditions associated with the degradation, as well as other causative information. None of this is or will be available in two years.

As for the question of who will fund it and what is a schedule, there is no answer. It is not in anyones budget now, and to do it well will cost well beyond what we have done for ozone.

That is my assessment. A lot of it is based on both my experience with the

San Joaquin Valley Ozone and PM studies.

Steve Ziman