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 describes the dispersion algorithms utilized in 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 a technical description 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 I of the ISC3 User's Guide provides user

instructions for the ISC3 models.


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 as Work Assignment Manager

(WAM). The technical description for the dry deposition

algorithm was 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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