February 1, 1989







MEMORANDUM

SUBJECT:  E. Helena Lead SIP

FROM:     Dean A. Wilson, Meteorologist
          Techniques Evaluation Section, SRAB (MD-14)

TO:       John Notar, Meteorologist
          Region VIII (8AT-AP)


     In response to your request, the Model Clearinghouse has
reviewed your January 11, 1989, letter to the State of Montana
regarding the E. Helena lead SIP.  As we discussed on the
telephone on January 25, 1989, we do not have any significant
problems with your position as described in the letter.  Because
of our long-standing position regarding the requirement for on-
site meteorological data when using COMPLEX I, we request that
you indeed require the State to collect the on-site data for the
"final analysis" if they plan to use COMPLEX I.

     We also briefly discussed the SIP procedural issues
associated with using one modeling protocol for a preliminary
analysis and a second protocol for a "confirming" analysis, once
the on-site data are collected.  While this procedure is not the
normal type of SIP, my understanding is that it may be possible
in this case.  Martha Smith will discuss this issue with the
appropriate SIP contact people in your Region.

If you have any questions, please contact me.

cc:  M. Smith, SO2/PMPB (MD-15)
     S. Reinders, SRAB (MD-14)