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Home My WebLink AboutSD-24-12 - Supplemental - 0500 Old Farm Road (9)Page 1 TECHNICAL MEMORANDUM Project: O’Brien Brothers – Hillside East South Burlington Date: June 3, 2024 By: Roger Dickinson, PE Subject: Updated Trip Generation Calculations The following tables present updated trip generation calculations resulting from the proposed addition of two single-family detached residential units to Phase 1 of the Hillside East PUD. Two multi-family residential units will be removed in order to maintain the same residential density, including the senior adult housing, of 564 units. Table 1 - Existing Phase 1 Residential (155 single-family units) Weekday Peak Hour Project-Generated Vehicle Trips (vte/hr) Land-Use Size AM Peak Hour PM Peak Hour Enter Exit Total Enter Exit Total Single-Family Detached Housing 87 units 17 49 66 55 32 87 Single-Family Attached Housing1 68 units 10 23 33 22 17 39 Subtotal –Phase 1 Residential 155 units 27 72 99 77 49 126 Multi-Family Housing (Mid-Rise)289 units 27 89 116 69 44 113 Senior Adult Housing -Multifamily 120 units 8 16 24 17 13 30 Hotel 120 rooms 31 24 55 36 35 71 Office/Commercial 97,000 sf 132 94 226 317 315 632 Total Trips 225 295 520 516 456 972 Internal Capture Vehicle Trips (@ 50%)3 3 6 54 54 108 Transit & Non-Motorized Trips 0 0 0 0 0 0 Total External Vehicle Trips 222 292 514 462 402 864 Total External Vehicle Trips with 6% TDM credit 209 274 483 434 378 812 1 The ITE single-family attached housing land-use category includes duplexes, triplexes and rowhouses. Page 2 Table 2 - Proposed Phase 1 Residential (157 single-family units) Weekday Peak Hour Project-Generated Vehicle Trips (vte/hr) Land-Use Size AM Peak Hour PM Peak Hour Enter Exit Total Enter Exit Total Single-Family Detached Housing 89 units 17 50 67 56 33 89 Single-Family Attached Housing 68 units 10 23 33 22 17 39 Subtotal –Phase 1 Residential 157 units 27 73 100 78 50 128 Multi-Family Housing (Mid-Rise)287 units 26 89 115 68 44 112 Senior Adult Housing -Multifamily 120 units 8 16 24 17 13 30 Hotel 120 rooms 31 24 55 36 35 71 Office/Commercial 97,000 sf 132 94 226 317 315 632 Total Trips 224 296 520 516 457 973 Internal Capture Vehicle Trips (@ 50%)3 3 6 54 54 108 Transit & Non-Motorized Trips 0 0 0 0 0 0 Total External Vehicle Trips 221 293 514 462 403 865 Total External Vehicle Trips with 6% TDM credit 208 275 483 434 379 813 The proposed change from 155 to 157 Phase 1 single-family residential units will increase the pm peak hour trip generation from 126 vte/hr to 128 vte/hr, an increase of 2 vte/hr. The corresponding reduction in the number of multi-family units will offset that, however, resulting in a net increase of 1 vte/hr.