° . AAP TER * Oo . wn oie y . : ‘ .* “ ; . , ‘ ‘ t' : - we 2Be t “4 * * = ae RE ooee as 3aPOPTIE PO e “a . oneMage 4 TOD . .- e , ye 7 ols. et . ‘ ae PRE Ae a tt & . . : ot wed G ob Fig. B.4.1.m. ®°Co isoexposure and isoconcentration contours. (Refer to alphabet ic symbol key in this appendix.)