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PREFACE

     This User's Guide provides documentation for the Industrial Source Complex (ISC3) models, referred to hereafter as the Short Term (ISCST3) and Long Term (ISCLT3) models.  This volume provides user instructions for the ISCST3 and ISCLT3 models, including the new area source and dry deposition algorithms, both of which are a part of Supplement C to the Guideline on Air Quality Models (Revised).

     This volume also includes user instructions for the following algorithms that are not included in Supplement C:  pit retention (ISCST3 and ISCLT3), wet deposition (ISCST3 only), and COMPLEX1 (ISCST3 only).  The pit retention and wet deposition algorithms have not undergone extensive evaluation at this time, and their use is optional.  COMPLEX1 is incorporated to provide a means for conducting screening estimates in complex terrain.  EPA guidance on complex terrain screening procedures is provided in Section 5.2.1 of the Guideline on Air Quality Models (Revised).

     Volume II of the ISC3 User's Guide provides the technical description of the ISC3 algorithms.


ACKNOWLEDGEMENTS

 

     The User's Guide for the ISC3 Models has been prepared by Pacific Environmental Services, Inc., Research Triangle Park, North Carolina.  This effort has been funded by the Environmental Protection Agency (EPA) under Contract No. 68-D30032, with Desmond T. Bailey and Donna B. Schwede as Work Assignment Managers (WAMs).  The user instructions for the dry deposition algorithm were developed from material prepared by Sigma Research Corporation and funded by EPA under Contract No. 68-D90067, with Jawad S. Touma as WAM.

 

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