ILM Circle K Traffic Memo - 11.22.2019
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November 22, 2019
Andy Priolo Circle K Stores, Inc. 1100 Situs Court, Suite 100 Raleigh, NC 27606 919-566-1722 RE: ILM Circle K Traffic Analysis, Wilmington, North Carolina Dear Mr. Priolo, On May 13th, 2019 a meeting was held to discuss the Circle K Development proposed for construction off N 23rd Street adjacent to the Wilmington International Airport (ILM) in Wilmington, NC (Parcel 1 – see attached). The purpose of the meeting was to determine if a full traffic impact analysis (TIA) would be required for the subject development or if a less complex traffic analysis should be completed to determine the required offsite improvements to mitigate impacts from the proposed Circle K development. Ultimately it was determined that, because a previous TIA (ILM Business Park – sealed August 30th, 2013 by Davenport) was
completed for the airport property, a traffic analysis would suffice for the subject development. The Davenport TIA provided a multiphase (six total phases) study of ILM Business Park and included recommended offsite improvements to mitigate site impacts for each phase of Business Park development. Currently only one development, a 10,000 square-foot flex space building, has been constructed as part of the ILM Business Park. At the May 2019 meeting it was determined that an analysis was required to compare the projected trips from the Circle K development (and 10,000 square-feet of flex space) to the projected trips from Phase 1 (or Phase 2 if applicable) of the ILM Business Park TIA. Based on this comparison, the required offsite improvements to mitigate impacts from the Circle K Development will be determined. If the combined trips from the proposed Circle K and flex space are less than those projected in the TIA for Phase 1, only those offsite improvements described for Phase 1 are required for construction. Should the combined trips from the proposed Circle K and flex space exceed those projected in the TIA for Phase 1, offsite improvements described (in the TIA) for both Phase 1 and Phase 2 are required for construction. This memorandum provides: (a) the trip generation for the proposed 5,000 square-foot Circle K and 10,000 square-feet of flex space, (b) the trip generation values for Phase 1 of the proposed Business Park (as described in the 2013 TIA), and (c) a determination of the required offsite improvements (as outlined in the original TIA). Proposed Trip Generation The proposed Circle K Development will consist of a 5,187 square-foot gas station to be construction in the southeast quadrant of the N 23rd Street / Airport Boulevard intersection. The
Circle K gas station will include 8 pumps and 16 fueling positions. The proposed development will have a right-in/right-out driveway connection to N 23rd Street and a site driveway connection
to a future internal access roadway. The site-generated trips shown in Table 1 are based on trip generation information provided in the 10th Edition of the Institute of Transportation Engineer’s (ITE’s) Trip Generation Manual. The trip generation was calculated using the proposed square
footage (5,187) as the independent variable. The provided rate was used to help generate trips (per NCDOT standards). The 10,000 square-feet flex space includes a variety of uses (office, light commercial, and a small restaurant). Per the May 2019 meeting, trips for the flex space should be projected using the ITE Trip Generation Manual. Because a land use code does not exist specifically for “flex
space”, land use code (LUC) 710 (Office) was used for analysis. This land use type was chosen as the existing building occupants are not significant trip generators. The flex space trip
generation was calculated using the proposed square footage (10,000) as the independent variable. The provided equation was used to help generate trips (per NCDOT standards). Table 1 below provides the daily and peak hour trip generation. Table 1: Trip Generation Summary
ITE Land Use Code Independent Variable Daily Total
AM Peak Hour PM Peak Hour
In Out Total In Out Total 960 – Super Convenience Market / Gas Station 5,187 SF 4,345 216 216 432 180 180 360
710 – Office 10,000 SF 114 31 5 36 2 11 13 Subtotal: 4,459 247 211 468 182 191 373 Pass-Bys (AM – 62% / PM – 56%) -- -134 -134 -268 -101 -101 -202 Total: 4,459 113 87 200 81 90 171
SOURCE: Institute of Transportation Engineers’ Trip Generation Manual 10th Edition (2017) As shown in Table 1 above, AM peak hour trips generated totaled 468 vehicles where PM peak hour trips totaled 360 vehicles. Pass-by percentages of 62% and 56% were assumed for AM and PM peak hour trips, respectively. Although no pass-by codes were provided for LUC 960*, pass-by percentages for LUC 945 were applied. Because this development is located off a major route, it is highly likely that a large percentage of site trips will be pass-by trips. Following this reduction, final AM peak hour trips totaled 200 vehicles and PM peak hour trips totaled 171 vehicles. Average daily traffic (ADT) volumes generated by the development totaled 4,345 vehicles per day. No reduction in trips was included due to internal capture. * It should be noted that LUC 960 provides a more conservative trip generation projection than LUC 945 (used in the 2013 Davenport TIA). LUC 960 was used for this analysis per guidance found in the ITE Trip Generation Manual based on the proposed Circle K square footage. ILM Business Park Phase 1 Trip Generation Per the August 30th, 2013 Davenport TIA, Phase 1 of the ILM Business Park included a 16 fueling position gas station and a 3,000 square-foot restaurant with no drive-thru window. Per Table 6.1 of the subject TIA (attached), trips for Phase 1 of ILM Business Park totaled 204 vehicles during the AM peak hour and 172 trips during the PM peak hour. The TIA determined that, along with traffic signal coordination along 23rd Street**, a 100-foot northbound right-turn lane (with appropriate taper) is required for construction at the 23rd Street intersection with the proposed right-in / right-out driveway (to be construction between Parcels 1 and 2 – see attached). ** This requirement was later waived by the NCDOT in the May 13th, 2019 meeting.
8/30/13 13-216 Wilmington International Airport Business Park – Transportation Impact Analysis 17
6.0 Phase 1 Analysis
6.1 Phase 1 Trip Generation
The estimated trip generation for Phase 1 is provided in the table below. The study assumed this
phase development will be completed in 2016.
Table 6.1 - ITE Trip Generation
ILM Business Park - Phase 1 Development
Average Weekday Driveway Volumes
24 Hour AM Peak Hour PM Peak Hour Two-
Way
Land Use ITE Land Code Size Volume Enter Exit Enter Exit
Service Station with Convenience Market 945 16 Vehicle Fueling Positions 2,604 81 81 107 107
Fast-food Restaurant
without Drive-thru 933 3.0 Th.Sq.Ft. GFA 2,148 79 53 40 38
Total Unadjusted Trips 4,752 160 134 147 145
Service Station with Convenience Market 62% AM / 56% PM -1,458 -45 -45 -60 -60
Total Adjusted Trips 3,294 115 89 87 85
6.2 Phase 1 Trip Distribution
Site trips for this proposed development were distributed based on the existing traffic patterns and
engineering judgment. Figure 5A shows the primary trip distribution for Phase 1. The directional
distributions for the Phase 1 site trips used for this study are as follows:
• 30% to and from the east on US 74
• 20% to and from the west on US 74
• 15% to and from the south on 23rd Street
• 11% to and from the north on Blue Clay Road
• 10% to and from the north on Castle Hayne Road
• 10% to and from the east on Kerr Avenue
• 2% to and from the west on Kerr Avenue
• 2% to and from the east on Airport Boulevard
The pass-by trip distribution for Phase 1 is illustrated in Figure 5B. The directional distributions for
the pass-by site trips are as follows:
• 50% to and from the south on 23rd Street
• 50% to and from the north on 23rd Street
N
SIGNALIZED
INTERSECTION
UNSIGNALIZED
INTERSECTION
TRAFFIC MOVEMENT
BLACK = EXISTING
GREY = UNANALYZED
BLUE = PHASE 1
ROADWAY
LEGEND
AM / PM PEAKS
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*** NOT TO SCALE ***
PROJECT NUMBER 13-216
WILMINGTON INTERNATIONAL
AIRPORT BUSINESS PARK
Thisdocument,togetherwiththeconceptsanddesignspresentedherein,is
intendedonlyforthespecificpurposeandclientforwhichitwasprepared.
Reuseof,orimproperrelianceon,thisdocumentbyotherswithoutwritten
authorizationandadaptationbyDAVENPORTshallbewithoutliabilityto
DAVENPORTandshallbeaviolationoftheagreementbetweenDAVENPORT
andtheclient.
FIGURE9
RECOMMENDED
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2016 PHASE 1
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Coordinateand optimize all
signals along 23rd Street.
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