Agenda - 10-06-2009 - 5b - Laserfiche WebLink

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I It 30 - - ',s-- 6° 1. SUADURY AND CONCLUSIONS In response to the problems of continued air pollution throughout California's urban areas, some local air pollution control officials have proposed or a acted Trans on the use of drive• -thru service lanes at locations such as banks and convenience restaurants. . Proponents of such a measure argue that drive -thru Lanes generate more air pollution than park- and -stop activities. A detailed analysis of the effect of a ban on drive -thru Ianes in theiiake Taboo reJa r 't A Lji, 1i_aVJi Ya WaL. {i M YL 'ar fi.K a' '1`.:!°AaA' 'Ci A. x:x ;Si.•....:•iriH^ � .t^.♦ "t w:xi o : Ieeof caiirgnnono�fiii )and smog?` CO euassians for an avera a convenience restaurant would decrease by 10 °le if the ban were eTisuinated. Enri of r �w oda'`rgar c gas�es.(R QQA one of the two main ingredients of smog) would d . by 13% in the summer. and 19% in the winter. Respective decreases of 18'/5 and summer and winter emissions of oxides of nitrogen (N4x) would also be realized emissions are the second main ingredient of smog) The results of the analysis fo . s typical convenience restaurant in the Lake Tahoe r egion are shown in Fig= 1. These results are consistent with a 1991 study of the effect ofbanrung drive -thru service ' lames at convenience restaurants in Southern Caiifornia.l' Previous analyses that have led to other conclusions have suffer om two rincipal errors. Pn st, none of the earlier yses looked at the evaporative emissions from cars. These emissions, which consist of i gasoline vapors conning from the gas flank and fuel system. are responsible for the majority of the ROG emissions in convertmee restmirant parking lots. Second, none ofthe eoEer analyses used an accurate method for evaluating minuto-by-minute emissions of cars in restaurant parldng lots and for a short time after they leave the restaurant. ;a In this analysis, both "hot soak' and "running loss" evaporative emissions were included i4 the calculations. In addition, existing motor vehicle emissions models were supplemented with a more accurate technique to predict parlang lot-and drive - f f emissi©ns er;i a r ts- by- minute basis. This technique is described in detail in Section 4 of this report. in conclusion, there are no emission benefits being realized by the current ban on drive- - thru windows at either existing or new cdmieaieiice iestaui nulls. Tn tact, there is Ir'keiy to be a slight decrease in emissions of all pollutants if the current ban on drive -thra windows is eliminated. While this analysis is based on Lake Tahoe ambient conditions and data validated for convenience restaurants in this region, the some general conclusions are Tritely to bold true for sinily restaurants in other locations and under diffwtM ambient conditions. It thus appears that efforts in California and other states to prohibit drive -thru "A windows for air quality purposes are counterproductive and may result in higher rather than lower emissions. Sup=aipes denote reftw=provided in Smdon 7. •1-