HomeMy WebLinkAbout0_SecondReviewResponseLetter_09242021
2304 N. 7TH AVENUE | SUITE L | BOZEMAN, MT 59715 | (406) 587-2781
Professional Consulting Engineers and Land Surveyors
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September 27, 2021
City of Bozeman- Community Development Department
PO Box 1230
Bozeman, MT 59771
Attn: Diane Tolhurst, Development Review Coordinator
RE: Park View Crossing Major Subdivision (CoB #21158)
Preliminary Plat Submittal – Second Review
Dear Diane,
The purpose of this submittal is to provide you with the additional information requested from the City of
Bozeman Planning and Engineering comment letters. The comment letters were received from you via
email on September 14, 2021 (Planning) and September 23, 2021 (Engineering).
The following matches the review letter response from Susana Montana, Senior Planner dated September
13, 2021;
1. The width of the shared use path has been labeled on the Preliminary Plat.
2. The paths located south of Block 1 and north of Block 3 are city standard sidewalks. The width has
been labeled on the Preliminary Plat.
3. Per conversation with the City of Bozeman Parks and Recreation Department, the shared use
pathway will be located within Vaquero Parkway right of way and extend from the property’s
northern boundary to the southern boundary. The existing trail within the Gallatin County Regional
Park will provide the connectivity necessary for the development. The northernmost and
southernmost sections of E-W sidewalk will provide access to the trail.
4. The mid-block crossing is not intended as a shared-use path. The widths of Lots OS-1 and OS-2 can
be found in the Line Table located on Sheet 2 of the Preliminary Plat.
5. Noted.
6. The notes title on Sheet 3 has been changed from “General Notes” to “Conditions of Approval”.
7. The subdivision spelling will be Park View Crossing, and all names are consistent on the Preliminary
Plat.
8. Stokes Lane and Tschache Lane have been labeled on the Preliminary Plat.
9. Note 4 has been updated.
10. Note 9 has been updated.
11. The Certificate of Accepting Cash Donation in-lieu of Land Dedication block has been updated.
12. The narrative describing the supplemental preliminary plat requirements can be found in the file
named “0_PrelimPlatSupplementalInfo_06232021”. This document also contains all necessary
information required from MCA 76-3-608.
The following matches the review letter memorandum from Karl Johnson, Engineer I dated September 23,
2021;
ENGINEERING REQUIRED CODE CORRECTIONS:
The following items are required for engineering to complete a full review.
General
1. a. The provided flood hazard evaluation includes a “Proposed Flood Plain Map” that shows the
location of the floodplain in relation to the subject property. The floodplain area, as depicted on
the Spring Ditch Floodplain Map, has been added to a figure that is enclosed with this response.
Letter to City of Bozeman
Re: Parkview Crossings – Preliminary Plat Comment Response #2
Bozeman, MT
September 27, 2021
Page 2 of 2
L:\193211\_Preliminary Plat\_Response\_Part II\_City Cover Letter Response.doc
The figure shows the floodplain’s minimal encroachment within Common Area 1, which contains
only the stormwater pond for the development. The floodplain is not in close proximity to any of
the residential lots. The HEC-RAS output and cross sections from the flood hazard evaluation are
now included for review.
Grading and Drainage
1. a. The fill resulting from the stormwater pond construction has been located outside of the
watercourse setback. As a result of shortening the overall pond length, the pond has increased in
width and maintained the same overall area and storage capacity.
2. a. Groundwater is known to be high in this area. The geotechnical report from 2001 that is
provided includes borings near the existing Pond 5B location. This boring showed depth to
groundwater at 3 feet below ground surface. The Gallatin County Local Water Quality District
Monitoring Well in the regional park (directly south of the development) shows the static water
level at 6 feet. We have noticed a late peak in some of the groundwater monitoring around town,
showing up in or near September. I am confident this suffices for the applicable groundwater
elevation and we have provided sufficient storm storage and are not altering the existing pond
bottom elevation.
3. a. The detention pond has been sized for runoff estimated by the modified rational method. As
stated in the Engineering Report, the SCS method was used to estimate the rainfall accounted for
with initial abstraction. The remainder of rainfall (within the first 0.5 inches of the storm) will be
retained in the stormwater pond, due to the outlet weir being set 4 inches above the bottom of
pond elevation.
I hope that the enclosed information allows you to move forward with the review of this project. If for any
reason you have any questions, or need any additional information during the review of this project, please
feel free to give me a call at 587-2781 or send an email to bmegaard@hyaliteeng.com.
Sincerely,
______________________________
Brett Megaard, PE
Project Manager
Cc: File: 193211
Owner
Enclosures: As noted