HomeMy WebLinkAboutSD-20-24 SP-20-029 - Supplemental - 0510 Shelburne Road (30)TRAFFIC SUMMARY
510 SHELBURNE ROAD
SOUTH BURLINGTON, VERMONT
Prepared For:
Bacon Street Commercial
510 Shelburne Road
South Burlington, VT
Prepared By:
Colen Johnson, P.E.
Trudell Consulting Engineers (TCE)
478 Blair Park Road
Williston, VT 05495
802-879-6331
PROJECT
LOCATION
2
1.0 INTRODUCTION
This traffic report is intended to provide an overview of the vehicle access and project-
generated traffic associated with the proposed development of the 0.68 acre property
located at 510 Shelburne Road in South Burlington, Vermont. The property, owned by
Champlain Oil Company, Inc., is located on the southeast corner of the Bacon Street
and Shelburne Road (U.S. Route 7) intersection, with direct frontage on both Bacon
Street and Shelburne Road. The property is located approximately 0.2 miles north of the
major intersection of Interstate I-189 and Shelburne Road (U.S. Route 7). In accordance
with the South Burlington Land Development Regulations (dated 11/29/2019), the
property is located within a Zone 1 Traffic Overlay District – Major Intersections.
↑ Project Location ↑
The existing site contains a gas/service station which is proposed to be removed with a
new three story mixed use commercial building (herein called the project) to be
constructed in its place. This report is meant to summarize the traffic impacts of the
proposed project and show compliance with the requirements of the Traffic Overlay
District in accordance with Section 10.02 of the South Burlington Land Development
Regulations.
↑Exhibit 1:Existing Gas/Service Station On-Site ↑
3
2.0 EXISTING ACCESS
The existing gas/service station on site has multiple curb cuts and access points on both
Shelburne Road (U.S. Route 7) and the Class 3 designated Bacon Street. The existing
gas station parking lot contains two wide curb cuts on Shelburne Road (U.S. Route 7),
allowing for left and right turn entrance and egress from each access location. The
northern property boundary directly abuts Bacon Street with no curbing or divide
between the gravel/pavement on site and the roadway surfacing. With no defined
access or change in grade between the roadway and on-site surfacing, two-way
entrance and egress can occur at almost any location along the boundary line
between the project property and Bacon Street. The property also contains no defined
division between the on site pavement and the neighboring Walgreen’s parking lot,
allowing for unimpeded traffic flow between the properties in multiple locations along
the southern property boundary.
↑Exhibit 3: Curb Cuts on Shelburne Road (Looking Southeast)
Exhibit 4:Boundary Between On-Site Surfacing and Bacon Street (Looking East) ↑
↑Exhibit 2:Curb Cut Illustration ↑
4
3.0 PROPOSED ACCESS
The gas/service station is proposed to be removed and a new three-story mixed-use
commercial building is proposed to be constructed. The new building is proposed to
be positioned along the western portion of the site with frontage along Shelburne Road,
while meeting the setback requirements outlined in the South Burlington Regulations. A
parking lot is proposed to be located behind the new building on the eastern portion of
the site.
One curb cut is proposed on Shelburne Road (U.S. Route 7) at the southwest corner of
the site. This curb cut will allow only right turn entrance from Shelburne Road into the
property via a new 18-foot wide one-way slip lane on the southern portion of the site,
providing access from Shelburne Road to the rear parking lot. This slip lane will be for
one-way ingress only traffic.
One curb cut is proposed on Bacon Street, at the center of the site’s northern property
line. This curb cut will allow for right and left turn entrance and egress, providing access
from Bacon Street to the rear parking lot.
One curb cut is also proposed on the southeast corner of the site allowing for two-way
entrance and egress from the neighboring Walgreen’s parking lot to the project’s new
rear parking lot.
↑Exhibit 5:Proposed Site Layout With Access Locations ↑
Proposed 2-way Access
on Bacon Street
Proposed 2-way Access to
Neighboring Walgreen's
Parking Lot
Proposed 1-way Right
Turn Only Access From
Shelburne Road
5
4.0 TRIP GENERATION
TRAFFIC BUDGET:
In accordance with the South Burlington Land Development Regulations, the maximum
allowable trip generation for a lot’s use within a Traffic Overlay Zone is known as the
Traffic Budget. In accordance with Section 10.02.F and 10.02.G, the Traffic Budget or
maximum number of vehicle trip ends during the PM peak hour for the project property
is calculated based on lot size as follows:
Property Lot Size = 0.48 acres + 0.20 acres = 0.68 acres = 29,620.8 SF
Max Peak Hour Volume for Zone 1 (per Table 10-1) = 15 Trips / 40,000 SF of Lot Area
Project Max Peak Hour Volume = (15 Trips / 40,000 SF) * 29,620.8 SF = 11.1 Trips
15% Bonus for Right Turn Only from U.S. Route 7 (per 10.02.G) = 11.1 x 1.15 = 12.77 Trips
Project Maximum Peak Hour Traffic Budget = 13 Trips
EXISTING SITE:
The existing site contains a gas/service station with eight gas pumps/fueling locations.
In accordance with the 10th Edition of the ITE Trip Generation Manual, a gas/service
station (land use #944) with 8 fueling positions, will generate 112 vehicle trips during a
weekday peak hour occurring during a one-hour period between 4:00 and 6:00 pm.
In accordance with Section 10.02.H.2 of the Land Development Regulations, as the
existing peak hour volume for the site (112 trips) exceeds the maximum traffic budget
(13 trips), the existing peak hour volume of 112 peak hour trips will be the maximum
allowable volume for the site with no additional credits.
Project Allowable Peak Hour Traffic Volume = 112 Trip Ends
PROPOSED SITE:
The proposed three-story mixed-use commercial building will contain a donut/coffee
shop (without a drive-through) on the first floor, a walk-in bank on the first floor, a small
office on the second floor, and a small office on the third floor. In accordance with the
10th Edition of the ITE Trip Generation Manual, the proposed site will generate the
following pm peak hour traffic volumes:
Coffee/Donut Shop Without Drive Through (Land Use #936) with 1800 SF = 66 Trips
Walk-In Bank (Land Use #911) with 1800 SF = 22 Trips
Second Floor Small Office (Land Use #712) with 4050 SF = 10 Trips
Third Floor Small Office (Land Use #712) with 2805 SF = 7 Trips
Total Peak Hour Traffic Volume for Proposed Site = 105 Trips
Net Decrease in Peak Hour Trips
6
5.0 CONCLUSIONS
The proposed development of the project site, removing the existing gas/service station
and constructing a new mixed-use building with layout as noted, will meet the traffic
regulations applicable to the Traffic Overlay District - Zone 1 within the South Burlington
Land Development Regulations and reduce the property’s overall existing traffic
impacts. The traffic related compliance and impacts for the proposed project, outlined
in this report, are summarized as follows:
1.The proposed project will reduce the number of curb cuts on Shelburne Road
(U.S. Route 7) from two to one with only right-turn ingress allowed from Shelburne
Road. Reducing the number of curb cuts and restricting entrance to right-turn
only from Shelburne Road will reduce the potential conflict points associated
with this parcel.
2.The proposed project will result in 105 vehicle trip ends during the PM Peak Hour,
which is a net decrease in PM Peak trips for this site. This peak hour volume will
be less than the peak hour volume for the existing site, thus meeting the traffic
volume requirements for the Traffic Overlay District outlined in Section 10.02.H.2
of the South Burlington Land Development Regulations.
478 Blair Park Road Williston, VT 05495 802 879 6331www.tcevt.com42 Mapleville Depot Road St. Albans, VT 05478 802 528 5116
Civil Engineering Environmental Services Land Surveying Landscape Architecture
TRAFFIC IMPACT STUDY
510 SHELBURNE ROADSOUTHBURLINGTON,VERMONT
APPENDIX
TRIP GENERATION CALCULATIONS
478 Blair Park Road Williston, VT 05495 802 879 6331www.tcevt.com42 Mapleville Depot Road St. Albans, VT 05478 802 528 5116
Civil Engineering Environmental Services Land Surveying Landscape Architecture
19-202 510 Shelburne Road South Burlington, Vermont
Trip Generation and Traffic Calculations
Building Footprint 4800 SF
Budget Calculation -->15 trips per 40,000 SF
1800 SF Bank
Lot Size AC SF Total SF 1800 SF Coffee/Donut
0.48 20908.8 4050 SF Office
0.2 8712 2805 SF Office
Traffic Budget:11 Trip Ends
+15% for no direct lefts 13 Trip Ends
onto adjacent arterial
PM Peak
Trips Enter Exit
Existing (Alt. Traffic Budget)8.0 Fueling Pos.112 56 56
Proposed 4050.0 SF 10 3 7
2805.0 SF 7 2 5
1800.0 SF 22 10 12
1800.0 SF 66 33 33
105
-7
<---------**EXISTING MAX. PEAK HOUR EXCEED ZONE BUDGET
USE EXISTING AS BUDGET**
South Burlington Traffic Overlay District Zone 1: Major Intersections
PROJECT TRIP GENERATION
944: Gasoline/Service Station
Distribution
VariableLand Use
712: Small Office
911: Walk-in Bank
10.02.H.2 - In the event the existing peak hour trip gen exceeds max. allowable budge for the site including credits,
the existing peak hour trip gen shall be the max allowable for the site, and no additional credits shall be provided
for site improvements or any other cause. The provision shall not alleviate the responsibility of the applicant to
make traffic and other site improvements required by the DRB.
Floor 1 Commercial
Floor 1 Commercial
Floor 2
Floor 3
712: Small Office
936: Coffee/Donut w/o DT
Subtotal
29620.8
Net Increase
Gasoline/Service Station
(944)
Vehicle Trip Ends vs: Vehicle Fueling Positions
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 66
Avg. Num. of Vehicle Fueling Positions:9
Directional Distribution: 50% entering, 50% exiting
Vehicle Trip Generation per Vehicle Fueling Position
Average Rate Range of Rates Standard Deviation
14.03 4.25 -75.50 6.96
Data Plot and Equation
X = Number of Vehicle Fueling Positions
Study Site Average Rate
Fitted Curve Equation: Not Given R²= ****
Trip Gen Manual,10th Edition Institute of Transportation Engineers
0 5 10 15 200
100
200
300
8
112
Page 1 of 2
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Coffee/Donut Shop without Drive-Through Window
(936)
Vehicle Trip Ends vs: 1000 Sq. Ft. GFA
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 12
Avg. 1000 Sq. Ft. GFA:2
Directional Distribution: 50% entering, 50% exiting
Vehicle Trip Generation per 1000 Sq. Ft. GFA
Average Rate Range of Rates Standard Deviation
36.31 15.50 -74.84 13.22
Data Plot and Equation
X = 1000 Sq. Ft. GFA
Study Site Average Rate
Fitted Curve Equation: Not Given R²= ****
Trip Gen Manual,10th Edition Institute of Transportation Engineers
0.0 0.5 1.0 1.5 2.0 2.5 3.00
50
100
150
200
2
65
Page 1 of 2
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Walk-In Bank
(911)
Vehicle Trip Ends vs: 1000 Sq. Ft. GFA
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies:3
Avg. 1000 Sq. Ft. GFA:5
Directional Distribution: 44% entering, 56% exiting
Vehicle Trip Generation per 1000 Sq. Ft. GFA
Average Rate Range of Rates Standard Deviation
12.13 2.00 -24.15 12.41
Data Plot and Equation Caution –Small Sample Size
X = 1000 Sq. Ft. GFA
Study Site Average Rate
Fitted Curve Equation: Not Given R²= ****
Trip Gen Manual,10th Edition Institute of Transportation Engineers
0 2 4 60
50
100
150
200
2
22
Page 1 of 2
4/7/2020https://itetripgen.org/PrintGraph.htm?code=911&ivlabel=QFQAF&timeperiod=TPSIDE&x=1.8&ed...
Small Office Building
(712)
Vehicle Trip Ends vs: 1000 Sq. Ft. GFA
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 17
Avg. 1000 Sq. Ft. GFA:3
Directional Distribution: 32% entering, 68% exiting
Vehicle Trip Generation per 1000 Sq. Ft. GFA
Average Rate Range of Rates Standard Deviation
2.45 0.56 -5.50 1.38
Data Plot and Equation
X = 1000 Sq. Ft. GFA
Study Site Average Rate
Fitted Curve Equation: Not Given R²= ****
Trip Gen Manual,10th Edition Institute of Transportation Engineers
0 1 2 3 4 50
5
10
15
20
4
10
Page 1 of 2
4/7/2020https://itetripgen.org/PrintGraph.htm?code=712&ivlabel=QFQAF&timeperiod=TPSIDE&x=4.05&e...
Small Office Building
(712)
Vehicle Trip Ends vs: 1000 Sq. Ft. GFA
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 17
Avg. 1000 Sq. Ft. GFA:3
Directional Distribution: 32% entering, 68% exiting
Vehicle Trip Generation per 1000 Sq. Ft. GFA
Average Rate Range of Rates Standard Deviation
2.45 0.56 -5.50 1.38
Data Plot and Equation
X = 1000 Sq. Ft. GFA
Study Site Average Rate
Fitted Curve Equation: Not Given R²= ****
Trip Gen Manual,10th Edition Institute of Transportation Engineers
0 1 2 3 4 50
5
10
15
20
3
7
Page 1 of 2
4/7/2020https://itetripgen.org/PrintGraph.htm?code=712&ivlabel=QFQAF&timeperiod=TPSIDE&x=2.81&e...