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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 152 Air Quality/Climate Change Analysis Page 18 net new weekday trips.s As a result, proposed 20-position GDF vehicle trip emissions are expected to be 85 percent greater than vehicle trip emissions associated with the 16-position GDF evaluated in the 2007 Certified EIR. At the request of City of Redwood City staff, vehicle trip emissions associated with the proposed 20-position GDF were also analyzed to reflect an extreme maximum assumption that existing facility vehicle trips will double. If the extreme maximum assumption was used, proposed 20-position GDF vehicle trip emissions could instead more than triple compared to the 16-position GDF evaluated in the 2007 Certified EIR. (See Appendix B, Table B-2.) Note, however, that the extreme maximum assumption that existing facility vehicle trips will double is extremely unlikely. This is because for this to occur, the proposed facility's weekday average hourly vehicle trips would need to be 75 percent higher than the existing facility's weekday peak hour vehicle trips. Operation of the proposed expanded GDF is expected to result in a 20 percent increase in daily vehicle queuing hours as compared to estimates presented in the 2007 Certified EIR. The 2007 Certified EIR estimated that the 16-position GDF would result in 75 vehicle queue hours per day, while the proposed 20-position GDF is expected to result in 91 vehicle queue hours per day. (Note that since only a 12-position GDF was approved and constructed, current vehicle queue time is estimated to be 281 hours per day, more than three and a half times greater than expected for the 16-position GDF. The proposed 20-position GDF would reduce existing daily queuing hours by nearly 70 percent.) As compared to the 16-position GDF evaluated in the 2007 Certified EIR, vehicle queuing emissions associated with the proposed 20-position GDF therefore will increase by 20 percent. At the request of City of Redwood City staff, vehicle queuing emissions were also analyzed to reflect an extreme maximum assumption that existing facility vehicle trips will double. If the extreme maximum assumption was used, proposed 20- position GDF vehicle queue time could instead be 480 hours per day, more than six times the estimated queue time in the 2007 Certified EIR and 70 percent greater than the current daily vehicle queue time. This could result in a corresponding 540 percent increase in vehicle queuing emissions for the proposed 20-position GDF as compared to the 16-position GDF evaluated in the 2007 Certified EIR. (Appendix B, Table B-3.) The 2007 Certified EIR assumed a maximum annual gasoline throughput of 9 million gallons per year. Based on a maximum gasoline throughput of 18 million gallons per year6, annual ROG emissions will increase by approximately 3 tons per year and 16.5 pounds per day (Appendix B, Table B-5). The 2007 Certified EIR did not include emissions associated with heavy duty trucks needed to deliver gasoline to the 16-position GDF. Assuming a maximum gasoline throughput of 18 million gallons per year, gasoline delivery truck emissions could also increase. (See Appendix B, Table B-4.) Daily and annual criteria pollutant changes associated with operation of the proposed Costco Wholesale 20-position Redwood City GDF, as compared to the 16-position GDF evaluated in the 2007 Certified EIR, are shown in Tables 10 and 11. Based on this information, criteria pollutant emissions associated with operation of the proposed 20-position GDF would be less than significant. 5 Documentation of trip generation from the existing 12-position GDF and from the proposed 20-position GDF expansion is presented in the July 30, 2012 Preliminary Transportation Assessment prepared by Kittelson & Associates, Inc. (Kittelson, 2012a)and the July 27, 2012 Vehicle Trip &Queuing Information memorandum prepared by Kittelson &Associates, Inc. (Kittelson, 2012b). 6 Note that the Bay Area AQMD Permit No. G#11933 limits the facility's gasoline throughput to 29.8 million gallons per year. 7/30/2012