Item 7A Traffic Impact Analysis Threshold WorksheetTraffic Impact Analysis
THRESHOLD WORKSHEET
Title of Plan Costco Fuel Facility Expansion case No.
FzAi9-0060
Driveway Ordinance No. 634 requires that a Traffic Impact Analysis (TIA) be submitted with development applications (zoning,
concept plan, site plan, etc.) if the proposed development exceeds one or more of the three threshold criteria listed below. No
development applications will be accepted unless accompanied by a TIA. For those projects that do not exceed any of the
three criteria, a TIA Threshold Worksheet must be submitted and approved by the City Engineer in lieu of the required TIA prior
to submittal of the development application. Please describe in detail your evaluation of each criteria listed below. Additional
sheets may be attached if necessary.
Criteria #1:The development exceeds parking 100 spaces average per driveway.
The existing 12 pump gas station would be expanded to provide 24 pumps. Almost no new parking
spaces are added with the expansion. Therefore, this criteria is not met.
Criteria #2:Any driveway in the development is projected to serve 1000 or more vehicles per day.*
Transaction data was provided by Costco to estimate the number of gas customers and vehicles per day.
Figure 1 provides a breakdown of this data. As shown, any driveway in the development is not expected
to serve 1000 additional vehicles per day (vpd). In addition, no driveways with less than 1000 vpd
currently are expected to serve more than 1000 vpd. Therefore, this criteria is not met.
Criteria #3:Any driveway in the development is projected to serve 100 ingress vehicles or more in the design hour.*
Existing counts were taken at the site driveways and gas station to determine the number of driveway
trips. Figure 2 through Figure 4 depict the existing driveway counts and projected driveway trips. As
shown, any driveway in the development is not expected to serve 100 additional ingress vehicles. In
addition, no driveways with less than 100 ingress vehicles currently are expected to serve more than 100
ingress vehicles. Therefore, this criteria is not met.
* Unless approved otherwise, trip generation rates should be based on the most recent edition of the Institute of Transportation
Engineers (ITE) Trip Generation Manual.
I hereby certify that this project does not exceed any of the three threshold criteria shown above and therefore the development
would not warrant a TIA in accordance with Section 3.4 of the Driveway Ordinance No. 634 of the City of Southlake.
Name Marc Butorac Registration No. 124083 Date 9/30/2019
Firm ( Kittelson & Associates Phone 503-535-7419 Fax
For City Ufe Only: The reglpirement for a Traffic Impact Analysis with this submittal is hereby waived:
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IVEWAY FURTHEST FROM
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ADDED DWY INGRESS = 13
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Projected Driveway Trips Figure
Southlake, TX 4
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Projected Driveway Trips Figure
Southlake, TX 4
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