"Ziman, Steve (SDZI)" <SDZI@chevrontexaco.com>
	04/04/02 02:40 PM
		 
		 To: John Silvasi/RTP/USEPA/US@EPA, Ellen Baldridge/RTP/USEPA/US@EPA, Tom 
Helms/RTP/USEPA/US@EPA
		 cc: 
		 Subject: Information you requested


Tom, John and Ellen 
Per our discussion yesterday, here is the graph I showed you. It uses five 
years of data, from 1994 on. The second document relates to the issue of 
length of episode and movement towards more NOx limitation. This is a 
draft which will be included in the final CCOS historic data analysis, and 
was done for the Central California area.   I will forward some other 
things to you for information, as I get them.

<<Extfreq1.doc>> <<SJVEpisode extent.pdf>> 
Steve Ziman, Ph. D. 
Sr. Staff Scientist 
Air Issues and Technology 
ChevronTexaco Energy Research and Technology Co 
100 Chevron Way, Richmond, California 94802 
sdzi@chevrontexaco.com 
phone  510-242-1530 
fax       510-242-5577