Środowisko i energia · 28.11.1994

Requirements for Preparation, Adoption, and Submittal of Implementation Plans

EPA is issuing this proposal to augment the final rule that was published on July 20, 1993. Today's notice proposes to make several additions and changes as supplement C to the ``Guideline on Air Quality Models (Revised)''. Supplement C does the following: incorporates improved algorithms for treatment of area sources and dry deposition in the Industrial Source Complex (ISC2) model, adopts a solar radiation/ delta-T (SRDT) method for estimating atmospheric stability categories, adopts a new screening approach for assessing annual NO 2 impacts, and adds SLAB and HGSYSTEM as alternative models. The Guideline sets forth air quality models and guidance for estimating the air quality impacts of sources and for specifying emission limits for them. The purpose of the proposed changes is to enhance the guidance in response to a substantial number of public comments urging the Agency to do so. For the purposes of this document, EPA is soliciting public comments only on the four proposed changes associated with supplement C and will not respond to any comments that are outside the scope of this document. This limiting of EPA's responses to comments within the scope of this document allows th