HomeMy WebLinkAboutSD-21-28 - Supplemental - 3070 Williston Road (73)
Engineers Scientists Planners Designers
40 IDX Drive, Building 100, Suite 200, South Burlington, Vermont 05403
P 802.497.6100 F 802.495.5130 www.vhb.com
To: Chris Gendron, PE Date: April 7, 2022
Project #: 58590.00
From: Jennifer Conley, PE, PTOE
Nikki Mann
Re: Truck Traffic Impact Analysis
VHB completed the following truck impact analysis to estimate additional truck trips associated with BTV exporting
soils off site and the resulting impact on the roadway network in South Burlington. The soil removal is anticipated to
occur during the 2022 construction season.
Based on the amount of soil that would need to be removed and the likely rate of removal, it is anticipated that there
will be between 80 and 100 truck trips removing soil over a 10-hour day resulting in an average of 10 trucks trips per
hour in each direction over the course of the day. Unlike commuter trips or other trips that are anticipated to have
clear peak periods, this removal occurs steadily over the course of the day. These trucks will arrive at the site empty,
be filled with soil, travel to a drop off location and return empty for refill.
Two sites have been identified to receive the soil: the SD Ireland quarry on South Brownell Road in Williston and SD
Ireland’s yard on Avenue A in Williston. The routes these trucks are likely to take to and from these locations are
illustrated in Figure 1 on the following page. As shown in the figure, trucks destined for Avenue A in Williston will
travel along Williston Road to the east of the BTV Quarry Site. Trucks destined for South Brownell Road will travel on
the route shown in the figure, via Williston Road to the east to reach South Brownell Road.
VHB evaluated conditions with 10 truck trips arriving at the BTV Quarry Site and 10 truck trips leaving the BTV Quarry
Site each hour, split between the likely routes illustrated in Figure 1. For comparison purposes, VHB plotted the
anticipated truck volumes on the 2022 No Build traffic volume diagrams. As anticipated, the maximum truck trip
impact will occur on Williston Road when 10 peak hour trips travel in each direction. These 20 truck trips will comprise
less than 2 percent of the traffic volume in each direction on Williston Road and is not expected to create a significant
impact. Figure 2 illustrates the truck volumes superimposed over the 2022 No Build traffic volume networks.
Summary and Conclusion
VHB estimated the number of trucks that would visit the BTV Quarry Site as a result of the earth removal operation
necessary to construct a developable pad. Over the course of the day, it is anticipated that 10 trucks per hour will visit
the site and bring soil to two different SD Ireland locations in Williston. As a result, the peak impact on any roadway
segment will be twenty trucks per hour (ten heading to BTV Quarry Site and ten heading away), representing less than
two percent of the existing traffic flow on Williston Road.
Chris Gendron, PE
Ref: 58590.00
April 7, 2022
Page 2
Figure 1. Truck Travel Routes
Figure 2. Anticipated Truck Volumes