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8. B. - Page 59 <br /> �e��eration model t1�at builds o�� formats a€� established in t.he ISC <br /> models. � <br /> Relia�lce oz� ISC3, a less � and less accurate madel, is cout��er <br /> productive to t11e ai�al}�sis of i�r��acts for the pro}ect. L7.S. EPA <br /> s��ecificaIly reco3��znends �l�e use af AERMOD because it is seie�t�i�calf,� <br /> su��erio� to iSC3. Acco� to the U.S. E�A� AERMOD represe��ts <br /> so�and and sig�ai�'�cant advances over ISC35T.' Findin{;s of the peer <br /> review pane] su�gest that AERMOD's scie��tirc basis is "state-Qf The- <br /> science." F'snalI�r ,.U.S. EPA taoted. that the adequacy of AERMOT7's <br /> complex t�rrai€� approac�a for re�utata�y a�plications is seen most directly <br /> is� its pez°fornaance. AERMOD's comp�ex te� co�npoi�ei�t has �eez� <br /> evalua.ted extensively E�y camparing nlodel-csti��nate� r�gulatoay c�esaga� <br /> values and concei�tratio�� frequency dis�ributions with observations. Tl�ese <br /> co�nparisons l�ave de�3�onstrated AERMOD's s�X�eriority to 15�3�`T� at�c� <br /> CTDMPI_US {Co�npl�x �I�errain Dispersian Niodel PL,US unstal�le <br /> algoritE�ms) in estimating thase �Iat and complex terrain im}�acts e�f <br /> gr�atest re;�ula�ory irnpoxtanc�.�� P��opaner�ts s}�ould re-anaIyze th� <br /> impacts flf the p� ttsing Ehe most rabust model available. �n �r�y <br /> "�3A�QMD. 201 �. Recomzncnded Methads foi° Screersing and <br /> Modeling Local �tisks and Haza�•ds. Bay Area Air QuaEity Mar�age�ne��t <br /> T3istrict. 1V�ay, 201 �1 <br /> 12 Federal Rebis#er. 2005. 40 C�'R �arE S 1. Revision to t1�e Guidelin� on <br /> Air Quality Madels: Adoptio�� �f a I'�•eferred General Purpose {Flat and <br /> Com�l�x Ter:�ain} Bispersio��. Mod�:� and Qtl�er Revisions: Fina1 Rule. <br /> Wednesday, Nc�tfetnber 9, 2005. <br /> 13 �'�d�ral Register. 2005. 40 CFR I'art 51. Revisio�a to tk�e Guideli��e on <br /> Air Qualily Models: Ad�}�tion of a Preferrecl General I'urpose (Flat and <br /> Complex T�rrai�l) Dispersion Model and Otl�er Revisions: }�inal Ru�e. <br /> Wednesday, November 9, 2005. <br /> � Fed.er�l Re�ister. 2005. 40 CFR �'art � 1. .Revision tio th.e Guideline €�€� <br /> 1�ir Qualiiy Mod�ls: Ado�tic�n of a Pre�Terred Ger�eral Purpose {Flat and <br /> Complex Terrain) Dispersinn Madel a��d Qther Revisions: Firaal Rule. <br /> Wednesday, Noveml�e� 9, 2005. <br /> zs��-oo�. Page 12 of J 4 <br />