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8. B. - Page 96 <br /> to the ca��cer ri�k instead of t[�e emissiar� ra.te t�nderesti�nates the pater�tial <br /> hea[th risk fro�n re�adway emissior�s. <br /> `I�l�e pra�ilem with ap�lying tl�e �WF to the cancer risk it€stead of the <br /> e�nissian z•ate i.s that according to 1I�e SAAQMD the a�e sensitivity factnrs <br /> are desi�;a�ed to inerease to tl�e 70 yeur• avea•r�ge concejzfruteo�t of <br /> c(�em.icals to be azaalyzec�.' Accordij�g to tl3e �AAQMD g�iidance En <br /> o�•d�r t€� estitr�ate the 70-year average emiss'so�1s, tlle user wo�ald �enerally <br /> avera�e the em'rssio�s extracted frc��n the EMFAC mode�. BAAQMD <br /> reco��s���aends a three step pracess fihat requir�s a s's��ificai�t numbe� of <br /> corr�putatians. <br /> ��ep L�f1e frst step is ta dev�lop sensittvify weightir�g <br /> factors (SW�') t[z�t are tl�e age sensifi�ity valucs ��ritiplied <br /> by ti�e d�sratia�� of the e�.posure by the li�eti��e �f the <br /> exposure.� <br /> This is expressed as: <br /> 5erzsitivit}� W�i�I�i�� Factar = ASF x Length of Exposu� <br /> (Yea�•) / 70 yeaa• iaf�s}�an <br /> Tl�e City co►nplied rn�ith tf�►is step as shown in Ap�endiY G. <br /> �tep 2. The txser then estima�es 7�} yeat• average ernigsio�2 <br /> rates {emphasis added) by �nuttip]yi3�g eac� SWF by tE�e <br /> 3 E3A,RQM.D. 2fl1 I. Recorn�nended Methods for �ereening and Modeling Local Ris]<s <br /> and Ha�;ards. Bay Area Air Quality Manag�me��t F]istrict. May, 2011 page 69_ <br /> 4 BAAQM:L3. 201 J. Recamme��ded Methods for Scree3�ing aad Modeling Local Risks <br /> atad Hazards. B�y Area Air Qualify Manag�ment I]istrict. Nlay, 2011 pages 67-b$. <br /> 5 BAAQMD. ZO11. Recommended MEihods for Screenin� aiid Mocieling Local Risl�s <br /> and Haz.arc�s. Bay' A,rea Air Q�ality Vlac�ag�ment District. May, 201 ] page 68 <br /> 6 BAAQMD. 2�l 1. Recommended V#ethads for Screenin� and Modeling Local Risks <br /> and Hazards. �3ay Area Air Quality Yla.nagement District. May, 201 ]�age 67 <br /> Pa�e 4 of 8 <br />