HomeMy WebLinkAbout045 Response to Site Plan and Preliminary Plat Comments
895 Technology Boulevard, Suite 203, Bozeman, MT 59718 | 406.586.0262
July 1st, 2025
City of Bozeman
Planning Department
20 E Olive St.
Bozeman, MT 59715
RE: Hidden Creek Minor Subdivision Preliminary Plat – Response to Comments.
Thank you for your comments dated June 5th, 2025 for the Hidden Creek Minor Subdivision
Preliminary Plat Application submittal. The majority of the comment responses were uploaded to
Project Dox directly. This document seeks to address comment Ref #79 and comment Ref #80
which refer to the Hidden Creek Site Plan Application (25084). These comments state that all
comments from the site plan application relating to drainage design and the provided Traffic
Impact Study (TIS) be addressed prior to preliminary plat review. Please find the applicable site
plan comments below in addition to WWC Engineering/Madison’s responses in blue.
Preliminary Plat comment Ref #79:
Multiple issues were identified with the drainage report submitted with the site plan application.
The applicant has demonstrated with this preliminary plat application that the stormwater
drainage system proposed in the site plan application will be utilized to manage the stormwater
from the subdivision. The applicant must address all the comments on the drainage design from
the site plan application prior to further review of the preliminary plat.
Response: Please see the site plan comments below relating to the drainage design.
1. (SP-25084 Comment Ref #23) The applicant has not provided the grading for the
southern and western perimeter areas. The applicant must provide the grading for these
areas prior to further review.
Response: The grading plan has been updated to include the southern and western
perimeter grading. Please see the updated grading plan included in section 29 –
Stormwater Management.
2. (SP-25084 Comment Ref #24) Insufficient spot elevation or invert elevations. It is not
clear which direction stormwater will flow at the existing and proposed path.
Response: A sidewalk chase has been added to the PED trail along the west end of
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the property to ensure proper drainage per correspondence with Adam Oliver.
3. (SP-25084 Comment Ref #25) It is not clear which property owner would be
responsible for specific drainage facilities or the extent of the site. This document is
subtitled Lot 1. The City will maintain inlets and pipes located in publicly maintained
ROW.
Response: Stormwater facilities located on private property within Hidden Creek
Subdivision are to be maintained by private lot owners. A shared stormwater
agreement is being utilized for Lot 1, 2, 3 and 4. Basin C is the only stormwater
facility proposed within the public ROW and is to be utilized for the future Oak
Park Drive Extension.
4. (SP-25084 Comment Ref #26) The applicant refers to Basins A, B, and C in the report
text but the basin map refers to Runoff Areas 1, 2, and 3. The runoff areas and basins do
not appear to cover the same areas. The applicant must revise the report to provide
consistent analysis information prior to further review.
Response: The basins and contributing runoff areas have been updated for
clarification within Appendix C of the stormwater report. The total basin area and
runoff area have been updated to coincide. Additional runoff and basin areas have
been added per additional comments.
5. (SP-25084 Comment Ref #27) The applicant must demonstrate that the overflow
pathways will not convey water during the design storm event. The applicant has
proposed a drop curb behind the inlet. The applicant must demonstrate that the design
storm will not flow over the drop curb.
Response: The drop curb has been removed, and a full height curb is being utilized.
Calculations are included showing that a designated storm event will not flow over
the curb. The full height curb and gutter capacity calculations are included in
appendix F of the stormwater report.
6. (SP-25084 Comment Ref #28) The applicant must present a maintenance plan that
complies with DSSP Section II.B.5 prior to further review.
Response: A maintenance plan is included in the stormwater report and is included
with this submittal in section 29 – Stormwater Management. Please refer to the
updated stormwater report. Additionally, a shared stormwater agreement has been
provided and is in the preliminary stages.
7. (SP-25084 Comment Ref #29) The applicant must provide runoff calculations for the
swale area that borders the south and west sides of the site prior to further review. The
calculations must include any run-on from the property to the south. The applicant must
also account for the proposed area drains in the calculations.
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Response: Runoff calculations including the swale areas that border the South and
West perimeters have been included in the updated stormwater report. Area drain
calculations have been provided to show additional drainage located within the
green spaces of the site. Please refer to appendix D within the updated stormwater
report.
10. (SP-25084 Comment Ref #30) BMC 38.410.080- The applicant has presented
inadequate information for a complete review of the drainage design. Prior to further
review the applicant must:
1. Provide the design and detail for the area drains.
2. Provide a detail for the proposed stormwater swale.
3. Demonstrate that the overflow pathway can convey the runoff from the 100-
year storm without flooding the neighboring property. This analysis must include
runoff and overflow from the rest home property. The applicant must also
demonstrate where the overflow from the site will discharge to.
Response: Details of the area drains and swale are provided in the updated grading
and drainage plan located within the updated stormwater report. Calculations for
the area drains are included in appendix D of the updated stormwater report. Each
underground basin and area drain with respective gravel infiltration basins has
been oversized to accommodate additional runoff (if required). The Rest Home
Property is to be properly re-graded near the future northern border to limit any
excessive runoff onto Hidden Creek Subdivision. A shared stormwater agreement is
being provided for Hidden Creek Subdivision to accommodate additional storage
for any additional rest home runoff. Runoff from rest home is limited to a small
capacity and is accounted for.
In the event of a 100-year storm event, water will flow through the western swale,
utilize area drains that have been oversized and out towards Juniper Street if
needed.
11. (SP-25084 Comment Ref #31) The applicant must provide the design calculations for
the area drains prior to further review.
Response: Area drain calculations have been provided and are included in appendix
D.
12. (SP-25084 Comment Ref #32) The applicant must provide an exhibit showing the
drainage basins prior to further review.
Response: Drainage basins, including runoff areas are included in appendix C
exhibit.
13. (SP-25084 Comment Ref #33) The applicant has presented inconsistent area sizes in
the calculations. For example, Runoff Area 1 is presented with an area of 2.59 acres but
Basin A is presented with and area of 2.71 acres but the applicant has proposed that Basin
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A is Runoff Area 1. (SP-25084 Comment Ref #34) The applicant must present the runoff
demand for Oak Park Drive prior to further review.
Response: Runoff areas and basin areas have been updated and are included in
appendix C exhibit and appendix D calculations. Oak Park Drive is included.
14. (SP-25084 Comment Ref #33) The applicant must present the runoff demand for Oak
Park Drive prior to further review.
Response: Oak Park Drive runoff is included in appendix D – Basin Calculations.
Appendix F includes the pipes 6 & 7 calculations utilized for Oak Park Drive runoff.
An exhibit of the proposed roadway is included in section 030 Streets, Roads and
Alleys. Full plan and profiles will be provided with the infrastructure improvements
submittal.
15. (SP-25084 Comment Ref #35) The applicant must identify who owns the facilities
(i.e. which owner of the three proposed lots is the owner) prior to further review.
Response: Internal stormwater facilities (underground ADS basins, area drains,
swales, etc.) are to be maintained by lot 1, 2, 3 & 4 within Hidden Creek
Subdivision. A shared stormwater agreement is being provided showing the details
of this maintenance agreement. External facilities, Basin C located within public
ROW and being utilized for Oak Park Drive Runoff is to be maintained by the City
of Bozeman.
Preliminary Plat comment Ref #80:
BMC 38.220.060.A.11-The applicant has provided a Traffic Impact Study (TIS) dates January
2025, and identical to the TIS submitted with the site plan application on April 24, 2025. The
applicant must address the comments to the TIS provided with the site plan application review
on May 23, 2025 and submit the revised TIS prior to further review.
Response: Please see the site plan comments below relating to the provided Traffic Impact
Study (TIS).
1. (SP-25084 Ref#6) The traffic volumes presented in this table seem off and do not
match Figure 1. The applicant must address the discrepancy and verify that the correct
values were used in the intersection analysis prior to further review.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
2. (SP-25084 Comment Ref #22) The applicant must include the appendices prior to
further review.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
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included in section 030 Streets, Roads and Alleys.
3. (SP-25084 Comment Ref #89) The applicant must include in the narrative that the
Director of Transportation and Engineering has determined that additional intersections
within a half-mile of the development are not affected by the development and do not
need to be analyzed. Specifically, the requirement to analyze the intersections of Oak
Street with 7th Avenue and 19th Avenue and Durston Road with 7th Avenue and 19th
Avenue is waived due to upcoming MDT projects that will improve the level of service at
these intersections.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
4. (SP-25084 Comment Ref #90) The applicant indicated in the previous paragraph that
the data was collected in October of 2024. This paragraph states the data was collected in
September of 2024. The applicant must clarify when the data was collected and provide
consistent information in the report prior to further review.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
5. (SP-25084 Comment Ref #91) The applicant must state that the MDT data is reported
as annual average daily traffic prior to final site plan approval.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
6. (SP-25084 Comment Ref #92) The applicant must revise the title of the table to clarify
that the traffic data is annual average daily traffic prior to final site plan approval.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
7. (SP-25084 Comment Ref #93) There have been multiple crashes in this area. A copy
of the crash data has been uploaded to the City Documents and Staff Reports folder. The
applicant must revise the report to include the analysis of this data prior to further review.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
8. (SP-25084 Comment Ref #94) The applicant has not identified the trips assigned to the
local street network nor included a figure showing the trip numbers at individual
intersections. The applicant must provide these elements prior to further review.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
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9. (SP-25084 Comment Ref #95) The applicant must provide an analysis of 14th Avenue
and its intersection with Oak Street prior to further review.
Response: Traffic Impact subconsultant has updated the traffic impact report and is
included in section 030 Streets, Roads and Alleys.
10. (SP-25084 Comment Ref #96) The traffic impact study has indicated that stop signs
are recommended at the intersections crossing Juniper Street. The applicant must install
stop signs in the following locations as a part of this development.
1. Southbound 14th Avenue at Juniper Street.
2. Southbound Oak Park Drive at Juniper Street.
3. Northbound Oak Park Drive at Juniper Street.
Response: Acknowledged. We will coordinate with the applicant to ensure stop signs
are installed at these intersections.
End of Response to Preliminary Plat/Site Plan Comments