HomeMy WebLinkAbout2022-02-15 ACHD TIS AO
�z1Hi T� �,, Mary May, President
Kent Goldthorpe,Vice-President
It IL Rebecca W.Arnold,Commissioner
Sara M. Baker,Commissioner
CIO
.yam ®-to 5C_Z Cle:l Jim D. Hansen,Commissioner
February 15, 2022
John Ringert, P.E. (Email)
Kittelson &Associates
Subject: Black Cat Industrial TIS Review 1
The Ada County Highway District staff has completed an initial review of the submitted traffic
impact study (TIS) for the proposed Black Cat Industrial development.
Comments/recommendations provided by District Traffic Services and Planning Review staff are
listed below:
1. Staff recently had a meeting about the new industrial development proposed to the west of
this site in Nampa. The site plan for this area showed a north/south collector road
extending from this site to Franklin Road. Please include this road segment and the
intersection of the new collector road/Franklin Road in the study if this road will be
constructed with this development.
2. Franklin Road is listed in the CIP and IFYWP to be widened to 5-lanes, however, a
construction date has not yet been set and there is not enough existing right-of-way to
widen this segment to 5-lanes. The study may list this in the mitigation section, but please
also recommend alternative mitigation for the interim for this segment and indicate if it is
feasible.
3. Analyze the intersection of McDermott Road/Franklin Road under the 2030 background
and total conditions as a 3 X 3 signalized intersection. The study may list the widening of
Franklin Road to 5-lanes in the CIP in the mitigation section, but also needs to evaluate
the interim mitigation scenario where Franklin Road has not yet been widened to 5-lanes.
4. Staff supports a second access on Black Cat Road for the site based on the study.
However, staff has concerns about the actual use of the access by site traffic due to the
site layout. Most site traffic would have to navigate through internal parking drive aisles to
reach areas further within the site based on the proposed circulation. The site should be
designed so that this access is a direct and obvious private drive/road to access the
northern portion of the site.
5. The study recommends widening Black Cat Road to 5-lanes, however, there isn't enough
existing right-of-way. Please recommend alternative mitigation and if it is feasible. Even
though Black Cat Road and Franklin Road are listed in the CIP, it is uncertain when these
projects will be completed, so alternative mitigation should be recommended.
Ada County Highway District•3775 Adams Street•Garden City,ID•83714• PH 208 387-6100•FX 345-7650• www.achdidaho.org
6. The Synchro reports for the intersection analysis of Black Cat Road/Franklin Road do not
seem to reflect the correct phasing for the intersection based on the attached signal timing
and phasing sheets in the appendix. Please verify and update the analysis as necessary.
7. The existing signal timing should be used for the intersection analysis under the future
conditions and should not be optimized in Synchro consistent with District Policy 7106.5.2.
The signal timing and phasing should follow the table in District Policy 7106.6.2. Please
verify and update the analysis as necessary.
8. The sensitivity analysis for the thresholds for intersections should be based on v/c ratios.
Please verify and check that the thresholds are based on this. The Synchro report for the
sensitivity analysis for the intersection of McDermott Road/Franklin Road under the 2030
total conditions for the PM peak hour show acceptable v/c ratios but a LOS (based on
delay) of F.
9. Please clarify on page 26 and in the Executive Summary that the NB and SB approaches
of Franklin Road/McDermott Road operate within ACHD's acceptable thresholds for v/c
ratios under the existing conditions.
10. Please provide the number of site trips in the peak hour that can be added before
mitigation is necessary in Table 20. The percentage of the development is beneficial, but
the site trips in the peak hour should also be reported.
Please let me know if you have any questions.
Sincerely,
Paige Bankhead, E.I.
Assistant Traffic Engineer
Development Services
CC: City of Meridian — Bill Parsons
Sawtooth Development— Clay Sammis
John Gordon
ITD —Justin Price