Ammon Fields MPC_TIS Comparison Memo_10.5.2022
1220 North 500 West, Ste. 202 Lehi, UT 84043 p 801.766.4343 1
www.halesengineering.com
MEMORANDUM
Date: October 5, 2022
To: Pete Evans, Flagship Homes
From: Hales Engineering
Subject: Ammon BCP Trip Generation Comparison
UT21-1969
This memorandum discusses the study completed for the BCP development located in Ammon,
Idaho. A prior TIS dated November 24, 2021, had been completed based on a prior site plan.
Since then, unit counts have been updated and the purpose of this memorandum is to compare
trip generation and the roadway network between the two plans and to determine whether a new
TIS would be needed based on this information. A site plan is contained in Appendix A.
Project Description
The proposed project is anticipated to contain a mix of different types of residential units as well
as some commercial. The current mix of single-family, townhome, and apartment units is
unknown as of this writing. However, an overall unit count is known. Because single-family
housing generally produces higher trip generation rates per unit than multifamily housing, the trip
generation rate for single-family housing was used for the purposes of this memorandum despite
the fact that some of these units will likely be multifamily. This approach is therefore conservatively
high. A comparison between the new and old assumed land uses is shown in Table 1.
Table 1: Assumed Project Land Uses
Land Use Prior Intensity Current Intensity
Single-family detached housing 2,644 Units 2,635 Units
Townhomes 498 Units -
Apartments - -
Commercial / Office 100,000 sq. ft. 55,000 sq. ft.
The original study assumed a total of 3,142 residential units, while the current study assumes
2,635 units.
10/05/2022
1220 North 500 West, Ste. 202 Lehi, UT 84043 p 801.766.4343 2
www.halesengineering.com
Trip Generation
Trip generation for the development was calculated using trip generation rates published in the
Institute of Transportation Engineers (ITE), Trip Generation, 10th Edition, 2017. A comparison of
these trips with the original plan is shown in Table 2.
Table 2: Trip Generation
Period Original Plan Current Plan
Weekday Daily 25,944 trips 21,686 trips
Morning Peak Hour 2,226 trips 1,956 trips
Evening Peak Hour 2,720 trips 2,417 trips
As can be seen, the new plan is anticipated to produce fewer daily and peak hour trips. Morning
peak hour trips are anticipated to drop by approximately 12 percent and evening peak hour trips
are anticipated to drop by approximately 11 percent. It is not anticipated that this drop in trips
would have a significant effect on the improvements that were recommended in the TIS.
Roadway Network
Overall, the new roadway network remains similar to the network in the prior plan. An additional
access is planned to connect to 1st Street, which if anything, would likely improve the level of
service (LOS) at the project intersections onto 1st Street. The other notable change is the
consolidation of accesses onto 21st Street. The original plan had three, while the current plan
contains two. It is not anticipated that this will have a significant impact on the remaining southeast
access as it is on the eastern edge of the property where little background traffic passes.
Conclusions
The current site plan changes little from a traffic perspective when compared with the original
plan. It is not anticipated that the lowered peak hour trip generation will have a significant impact
on the improvements recommended in the TIS, nor is it anticipated that the revised roadway
network would necessitate any additional improvements that were not recommended previously.
For these reasons, it was determined that the TIS should still be adequate for the current site
plan.
If you have any questions, please contact us at 801.766.4343.
1220 North 500 West, Ste. 202 Lehi, UT 84043 p 801.766.4343
www.halesengineering.com
APPENDIX A
Site Plan
LEI PROJECT #:DRAWN BY:DESIGNED BY:SCALE:DATE:SHEET5---REVISIONS4---3---2---1---ENGINEERSSURVEYORSPLANNERS3302 N. Main StreetSpanish Fork, UT 84660Phone: 801.798.0555Fax: 801.798.9393office@lei-eng.comwww.lei-eng.com- A Utah Corporation -NOT
FORCONS
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ION1"=250'1LEI PROJECT #:DRAWN BY:DESIGNED BY:SCALE:DATE:SHEET2021-0020BLS/MJV5---REVISIONS4---3---2---1---9/12/2022ENGINEERSSURVEYORSPLANNERS3302 N. Main StreetSpanish Fork, UT 84660Phone: 801.798.0555Fax: 801.798.9393office@lei-eng.comwww.lei-eng.comFLAGSHIP HOMES
CITY OF AMMON, IDAHO - A Utah Corporation -DENSITY PLAN EXISTINGGDM/JWA2500125250NORTHSCALE:1"=250'S. 52ND E.1ST STREET LONA NORTH RD 55TH ELOW DENSITY RESIDENTIAL& PARK/GREEN SPACE±534.92 ACHIGH DENSITYRESIDENTIAL±118.45 ACHEAVYCOMMERCIAL±5.48 ACLEGENDLOW DENSITY RESIDENTIALMED-HIGH DENSITY RESIDENTIALHEAVY COMMERCIALPARK / GREEN SPACEBOUNDARY
LEI PROJECT #:DRAWN BY:DESIGNED BY:SCALE:DATE:SHEET5---REVISIONS4---3---2---1---ENGINEERSSURVEYORSPLANNERS3302 N. Main StreetSpanish Fork, UT 84660Phone: 801.798.0555Fax: 801.798.9393office@lei-eng.comwww.lei-eng.com- A Utah Corporation -NOT
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ION1"=250'2LEI PROJECT #:DRAWN BY:DESIGNED BY:SCALE:DATE:SHEET2021-0020BLS/MJV5---REVISIONS4---3---2---1---9/13/2022ENGINEERSSURVEYORSPLANNERS3302 N. Main StreetSpanish Fork, UT 84660Phone: 801.798.0555Fax: 801.798.9393office@lei-eng.comwww.lei-eng.comFLAGSHIP HOMES
CITY OF AMMON, IDAHO - A Utah Corporation -DENSITY PLANGDM/JWA2500125250NORTHSCALE:1"=250'S. 52ND E.1ST STREET LONA NORTH RD 55TH ELEGENDCOMMERCIALPARK / GREEN SPACER3 (DETACHED / ATTACHED / TOWNHOME)RS LOTS (4-8,000 SF)BOUNDARYROADWAY LOCALROADWAY COLLECTORS. 52ND E.C-1LIMITEDBUSINESSZONE5.48 ACR3118.45 ACRS534.92 ACTABULATIONSOVERALL AREA = 658.85 AC4.0 UNITS PER ACRE = 2,635 UNITSPARK/GREENSPACE