RES 89175 - Laserfiche WebLink

SR 89:133 Page 3 C) The percentage of "Departures" are of total trips (the sum of "Departures" and "Arrivals"). d) The Average Vehicle Occupancy. (Number of people per car). The 1988 Driveway Study produced reliable estimates of all of these factors. All of this information was not available for the last trip generation rate adjustment the City Council made, as items (b) and (c) above were unknown and (d) was estimated from Survey information. Use of Driveway Study Data Data from the 1988 TSM Survey, from a survey of "Building Occupancy," and from the driveway counts was placed in a Lotus 123 spread sheet. Comparison of the total number of persons counted leaving the building in the peak PM period in the Driveway Study was made against the total (expanded) number in the 1988 TSM Survey of employees saying they left. This determined a factor of 78% of TSM Survey employees reported leaving that were actually counted leaving (factor b above). Peak hour Directional Distribution for the buildings whose driveways were counted averaged a distribution of 85% outbound and 15% inbound. (1.00/0.85 = 1.18 or total vehicle trips = outbound x 1.18) (factor c above). The driveway study determined that an average vehicle occupancy of 1.14 people per car could be expected in those cars departing (factor d above). Calculation of Trip Generation Factor The 1988 TSM Survey reported trips as listed in the spread sheet were used for the base data. The spread sheet includes 9,568 "office" employees from the Hacienda, Pleasanton Park and Stoneridge area. The 1988 City-wide total employee number was 22,466 employees, which included all land use categories. The number of "Office" employees used to calculate the new "Office" trip generation factor represents 43% of the City's employees and is 83% of the total "Office" employees. The spread sheet includes 7,350 of Hacienda's 7,989 employees, or 92%. The Driveway Study included buildings with a total employee population of 7,662 employees, or 84% of Hacienda's employees and 80% of the total 9,568 North Pleasanton "Office" employees used in the spread sheet.