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HomeMy WebLinkAboutSP-22-004 - Supplemental - 0510 Shelburne Road (12)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 SUMMARY 510 SHELBURNE ROAD SOUTH BURLINGTON, VERMONT January 12, 2022 Prepared For: Champlain Company Inc, LLC 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 four-story mixed-use 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 four-story mixed-use building is assumed to consist of the following uses: •Commercial Space (1,665 SF) on 1st Floor → Assumed Use = Office Space •Commercial Space (1,570 SF) on 1st Floor → Assumed Use = Coffee/Donut Shop •Commercial Space (3,900 SF) on 2nd Floor → Assumed Use = Walk-In Bank •1 Bedroom Residential Units on 3rd and 4th Floors = Seven 1 Bedroom Units •2 Bedroom Residential Units on 4th Floor = Two 2 Bedroom Units It should be noted, that the commercial uses of the building are not final and may change later during final occupation of the space. The commercial uses listed are assumed. In accordance with the 10th Edition of the ITE Trip Generation Manual, the proposed site will generate the following pm peak hour traffic volumes: 6 Coffee/Donut Shop Without Drive Through (Land Use #936) with 1,570 SF = 57 Trips Walk-In Bank (Land Use #911) with 3,900 SF = 47 Trips Small Office (Land Use #712) with 1,665 SF = 4 Trips Third & Fourth Floor Multi-Family Housing Mid Rise (Land Use #221) with 9 DU’s = 4 Trips Total Peak Hour Traffic Volume for Proposed Site = 112 Trips The proposed site conditions will not result in an increase in existing peak hour trips. 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 112 vehicle trip ends during the PM Peak Hour, which equals the existing PM Peak trips for this site. This proposed peak hour volume will not exceed 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 TCE: 19-202 510 Shelburne Road South Burlington, Vermont Trip Generation and Traffic Calculations Budget Calculation -->15 trips per 40,000 SF 1,570 SF Coffee/Donut 1,665 SF Office Space Lot Size AC SF Total SF 3,900 SF Walk-In Bank 0.68 29700 29700 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 Fueling Pos.112 56 56 Proposed 9 DU 4 2 2 1665 SF 4 1 3 3900 SF 47 21 26 1570 SF 57 28 29 112 0 <---------**EXISTING MAX. PEAK HOUR EXCEED ZONE BUDGET USE EXISTING AS BUDGET** Floor 1 Commercial#1 9 DU Multi-Family Housing (Mid-Rise) 712: Small Office Building Floor 2 Commercial South Burlington Traffic Overlay District Zone 1: Major Intersections PROJECT TRIP GENERATION 944: Gasoline/Service Station Distribution VariableLand Use 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 #2 911: Walk-In Bank 936: Coffee/Donut w/o DT Subtotal Net Increase Floors 3-4 (9 Residential Dwelling Units) Note: The proposed commercial uses shown are assumed and exact commercial uses are to be finalized prior to building occupation. 221: Multi-Family Housing (Mid Rise) 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 4/7/2020https://itetripgen.org/PrintGraph.htm?code=944&ivlabel=UNITS944&timeperiod=TPSIDE&x=8&e...