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Debra Bloom, P,E,. City of Roseville October 29, 2007 Page 2 0 We conducted a trip generation comparison for retail developments with lower square foo tag es. Using the average rate 'in the ITE Trip Generation Reports results in significantly lower trips than using the fitted curve equation. In reviewing the data points presented in the ITE Trip Generation Reports, the data points for a shopping center development with lower square foo tag es coincide more closely with the fitted curve line, rather than the average rate. Using the fitted curve equation results in more that twice the number of estimated trips. A balance between these two is necessary to ensure that an appropriate trip generation estimate is used as part of the traffic analysis. There are inconsistencies with the number of screens that are documented In the report text and the trig generation estimates for the existing movie theater. The correct number should be identified in the report. For the movie theater, the trips were based on the number of screens. Based on our experience, a better estimate of trips for movie theaters is the number of seats. On page 5 of the traffic study, It is stated that a conservative approach was taken in estimating the trips for parcels 81A, SIB and 81C. Itis, stated that the current plan proposes SIA as 3,300 square feet and 81B and 81C with 3,300 total square feet of general retail. The memo states that the traffic analysis took a "'conservative" approach and used sit-down restaurant for the entire 6,600 square feet. However, if this property were in fact used as restaurant space with tbree different tenants (I e. coffee shop, sandwich shop, etc.), it would be more appropriate to use a fast-food type land use without a drive thru. This would result in more than twice the number of trips estimated for these parcels. The traffic study documents the use of various reduction factors, 'Including multi-use and puss -by reductions,. It appears as though the multiLuse reduction was applied to the shopping center rate. The ITE Trip Generation Reports and rates for'the shopping center land use already account for this type of reduction. Therefore, this reduction factor should not be applied to this use. * The application of the pass-by trip reduction i's confusing. The pass-by trips should only be reduced from the through volumes on the roadway affected by the pass-by trip diversion. The trip generation tables provided appear to reiduce the amount of trips generated by the mall based on the pass-by trip reduction factor, The amount of trips generated by the mall or ,other development is not impacted by the amount of piass-by traffic a spectric use causes, the trips should still be accounted for entering and exiting the site. Therefore, the driveway volumes shloolid rieffect all trips to/from the sit e, 'including pass-by trips. * Overall, if the trip generation estimates for the proposed mall redevelopment are underestimated or there is additional background traffic growth 'in the study area, the impacts to the adjacent roadway system would be understated.