March 2, 1989







MEMORANDUM

SUBJECT:  Paradise Power Plant

FROM:     Dean A. Wilson, Meteorologist
          Source Receptor Analysis Branch (MD-14)

TO:       Regional Modeling Contact, Regions I-X


     The attached memorandum to Region IV was not a normal Model
Clearinghouse response since there was no incoming written
request for review of a position.  However, since the Clearing-
house was involved in preparation of the memorandum and there are
a couple of modeling related issues involved, we are treating it
as a Clearinghouse response.

     The memorandum makes two points relative to modeling:

     1.  We are not compromising our position relative to the
Guideline language on the use of on-site meteorological data. 
When at least 1 year of on-site data is available, these data
should be used in preference to off-site data. 

     2.  Under the new SIP processing reform (54 Federal Register
2214) all SIP actions that involve nonguideline models or devi-
ations from modeling guidance are to be reviewed by Headquarters,
with sign-off by the Administrator.

     If you have any questions, please contact me.

Attachment

cc:  D. Grano, AQMD (MD-15)
     S. Reinders, TSD (MD-14)
     M. Smith, AQMD (MD-15)
     R. Vogel, AQMD (MD-15)