HomeMy WebLinkAbout0_FirstReviewResponseLetter_08162021
2304 N. 7TH AVENUE | SUITE L | BOZEMAN, MT 59715 | (406) 587-2781
Professional Consulting Engineers and Land Surveyors
Equal Opportunity Employer | www.hyaliteeng.com
August 16, 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 – First Review
Dear Diane,
The purpose of this submittal is to provide you with the additional information requested from the City of
Bozeman Engineering and Planning comment letters. The comment letters were received from you via
email on July 30th, 2021.
The following matches the review letter response from Susana Montana, Senior Planner dated June 16,
2021;
1. All lots have street frontage lengths of 25 feet or greater. See the Preliminary Plat (Section 2.g)
for lot line dimensions and the Graphic Site Plan (Section 1.a) for individual lot layouts and
building setbacks. As the lots will be alley loaded, no street trees will be located within the alley
right-of-way.
2. See the Preliminary Plat (Section 2.g) for all lot dimensions.
3. See the Graphic Site Plan (Section 1.a) for the Floor Area Ratios of each lot with less than 3,000
square feet of land area.
4. See the Preliminary Plat (Section 2.g) for all labeled easements. The alley will be located within a
30-foot wide publically dedicated right-of-way, thus no easement is necessary. A 10-foot utility
easement is located along all street frontages (excluding the alley).
5. The drainage pond lot is now denoted as Common Area 1, with the mid-block crossings being
located within Open Spaces 1 & 2.
6. As mentioned above, the drainage pond lot will be common area and now contains a separate lot
number on the Preliminary Plat. The middle block is now a single block – Block 2.
7. The shared use path will be located outside the platted area to the east within Vaquero Parkway
right-of-way. The shared use path will be constructed as a Class II trail and will ultimately be
constructed from Baxter Lane to Davis Lane. The trail will be adjacent to the regional park both
directly north and directly south of this development. Per discussions with the City of Bozeman and
Gallatin County Parks Departments, this is the ideal location for the shared use path.
8. The CC&R’s have been updated to define community wide standards in section 1.13. These
standards are not intended to supersede any City of Bozeman Standards.
9. The CC&R’s have been updated to reference the correct zoning.
10. BMC standards are now referenced in Sec. 11 and 12. The standards for townhouse dwellings have
been added to the CC&R’s.
11. Noted. The development will comply with the Landscape Block Frontage standards for the new
Road A.
12. Noted.
13. The CC&R’s have been updated and now note that perpendicular parallel parking is not allowed
with the alley right-of-way.
14. The mid-block pedestrian crossing should not be considered a recreation pathway, as the
developer is constructing a shared use path within the Vaquero Parkway right-of-way to provide
regional park connections both north and south of the proposed development. Per BMC Section
Letter to City of Bozeman
Re: Parkview Crossings – Preliminary Plat Comment Response
Bozeman, MT
August 16, 2021
Page 2 of 5
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38.410.040.D the mid-block pedestrian walk will be located within 10-foot wide Open Space
Parcels, with a 10-foot setback to the buildings on the northern and southern sides. These Open
Space parcels will be owned & maintained by the HOA.
15. The plat sheet date has been updated.
16. The acreage of Common Area 1 (containing the detention pond) is now included in the Subdivision
Area table.
17. The zoning of the land is found within the Surveyor’s Notes on Sheet 2.
18. The number and type of dwelling units allowed are found within the Surveyor’s Notes on Sheet 2.
The required setbacks, garage setbacks, etc. are not labeled on the plat as that criterion is
directly related to the zoning of the property.
19. The Owner’s Certification on Sheet 3 is a direct reference to ARM 24.183.1107 (4), which mentions
the certifications of final plat approval to be shown on the Conditions of Approval sheet.
The following matches the review letter memorandum from Karl Johnson, Engineer I dated July 30, 2021;
ENGINEERING REQUIRED CODE CORRECTIONS:
The following items are required for engineering to complete a full review.
General
1. a. The streambank will not be altered in any way with the extension of the existing stormwater
pond. The existing pond is located in a relatively flat area and the pond extension will remain on
the flat land feature. No alterations to the grading/slope down to the watercourse will be needed
for the pond extension. The outlet structure will be relocated, though the outfall location will
remain the same. Please see Sheet C4.2 for the updated grading info.
2. BMC 38.220.060.A.2
a. The floodplain report is now included (See Section 4 of the Preliminary Plat Application).
Water Rights
1. The City of Bozeman Engineer has been reached out to for assistance in determining the cash-in-
lieu of water rights associated with this development, as that is going to be the preferred route for
the subdivision. As soon as a response is seen, it will be forwarded onto you.
Grading and Drainage
1. The 50-foot watercourse setback is now shown on the Overall Site Plan (C1.0).
2. No newly constructed feature will be located within Zone 1 of the required watercourse setback. A
section of the proposed stormwater pond, as well as the outlet structure will be location within
Zone 2 of the watercourse setback (40% of the setback furthest from the watercourse).
3. BMC 38.220.060 (A.3)
a. The geotechnical study performed in 2001 is included in Section 4 of the Preliminary Plat
Application.
4. DSSP II.C
a. The original design report for the stormwater pond is now included (See Appendix C of the
Engineering Report).
b. Per the original design calculations, the original allocation for the subject property at the
existing stormwater facility was approximately 5,495 cubic feet of storage. On the “Pond
Report” for the existing pond (Appendix D of the Engineering Report) the total storage at
the 2-foot basin depth is 7,638 cubic feet. However, the emergency spillway for the pond
will only allow for 1.5’ water depth in the pond.
c. The proposed stormwater pond extension accounts for all discharge from the existing
development (Phases 4G & 4H of the Crossing 2), as well as the additional stormwater
Letter to City of Bozeman
Re: Parkview Crossings – Preliminary Plat Comment Response
Bozeman, MT
August 16, 2021
Page 3 of 5
L:\193211\_Preliminary Plat\_Response\_City Cover Letter Response.doc
runoff from this proposed development. The additional stormwater volume needed equals
the volume of the stormwater pond extension.
d. The weir-controlled outlet structure has been designed such that the release rate from the
system will be equal to the pre-development runoff rate for the 10-year storm. As the
overall pre-development area has not changed from the original design, the runoff rate
also remains the same. Thus, the weir designed with the original pond will meet this
requirement.
5. Per the City of Bozeman Design Standards, the release rate is equivalent to the pre-development
runoff rate at all water surface elevations. The pond sizing spreadsheet is included in Appendix B
of the Engineering Report. To more accurately model the discharge weir and pond volume,
Hydraflow Hydrographs extension for AutoCAD Civil 3D was used to develop a Stage-Discharge
relationship that shows the increasing release rate as the water volume in the pond increases.
6. As mentioned above, the Stage-Discharge relationship illustrates the weir-controlled runoff rates.
7. DSSP II.C.3
a. The stormwater pond is located within a Common Area parcel and the plat has been
updated to reflect this.
Transportation
1. See Section 4 of the Preliminary Plat Application for a discussion on traffic generation.
2. See Section 4 of the Preliminary Plat Application for a discussion on capacity and intersection LOS.
ENGINEERING REQUIRED CODE CORRECTIONS:
The following comments pertain to areas of the project that do not currently meet code.
1. BMC 38.410.060
a. A ten-foot utility easement is provided along all street frontages (excluding the Alley). See
the draft Preliminary Plat included with this response in Section 2.g.
b. A stormwater drainage easement is now provided over the entirety of the proposed
stormwater pond.
Grading and Drainage
1. DSSP II.B.1
a. All proposed stormwater improvements are now shown on Sheet C4.0.
2. Topographic contours are included at one-foot intervals on the Overall Storm Plan (C4.0).
3. Details and specifications for all storm drainage improvements are included in the Construction
Drawings (Sheets C4.0 – C4.2 & C4.10).
4. DSSP II.B.5
a. The system maintenance document is now included in Section 6.6 of the Engineering
Design Report.
5. The Engineering Design Report (Section 4) has been stamped and certified by a licensed
professional engineer.
Utilities
1. DSSP V.D.5.c
a. The location of the stormwater main (running north-south) has been updated to better
provide locations for street tree placement.
2. The water and sewer design report is now stamped and certified by a professional engineer.
3. DSSP V.A.4
a. Calculations detailing the water distribution system sizing are included with this response.
All the criteria within this section have been met in the water system design.
b. The main sizing calculations are included in Section 4.1 of the Engineering Design Report.
Letter to City of Bozeman
Re: Parkview Crossings – Preliminary Plat Comment Response
Bozeman, MT
August 16, 2021
Page 4 of 5
L:\193211\_Preliminary Plat\_Response\_City Cover Letter Response.doc
4. DSSP V.B.2
a. The wastewater demand calculations have been updated in the Engineering Report to
reflect the requirements set forth in DSSP V.B.
5. DSSP V.A.5
a. Per conversations with the water superintendent, John Alston, the proposed dead-end
mains have been approved. The water service to Lot 1 of Block 1 has been shifted west of
the fire hydrant and closer to the end of the water main.
6. DSSP V.A.6.c
a. Per conversations with the water superintendent, non-standard service locations are
allowed for the development due to the limited lot frontages. Considering the lots are
alley-loaded, dry utilities will not interfere with water or sewer service locations.
7. To limit the length of the dead-end main west of the fire hydrant, the water service stub to Lot 1
of Block 4 will be angled slightly. The location of this service stub has been shifted closer toward
the center of the lot, to mitigate this concern.
8. The sanitary sewer service to Lot 6 of Block 4 was installed with the infrastructure improvements
for Phases 4G and 4H of the Crossing 2. A note has been added to the Sewer Plan and Profile
(C2.1).
9. DSSP V.D.2 and 3
a. Per conversations with the water superintendent, nonstandard locations of water and
sewer mains are allowed in this instance due to the constraints of the existing main tie-in
locations.
10. DSSP V.D.5.c
a. As the existing water main tie-in location is near the storm sewer catch basin, the
alignment will veer south to increase the separation after the water main connection.
b. The sanitary sewer service location has been updated to provide additional separation
from the water main.
c. The service stub locations (water and sewer) have been updated to maximize the
separation from each other through the alley.
d. A meeting with the City Engineer and Water Superintendent took place on August 9th, 2021
to discuss varying options to increase separation of water and sewer service locations.
Transportation
1. Type B crosswalks are denoted on the Signage and Striping Plan (C5.3) and Pedestrian Crossing sign
locations have also been added.
2. Considering the trail for the neighboring Regional Park is located along the western property
boundary, the sidewalks located along the streets running east-west will be connected to the trail.
Lighting
1. DSSP XII.B
a. The intersection lighting for the two intersections of Road A and Vaquero Parkway have
already been constructed with the improvements from Phases 4G and 4H of the Crossing 2.
Additional lighting will be provided within the proposed development at each end of the
north-south portion of Road A, as well as a mid-block location on Road A.
2. DSSP XII.F
a. The lighting located at the proposed mid-block crossing will follow this section. See the
updated Lighting Plan in Section 6 of this response.
3. Two pedestrian lights will be installed at the mid-block crossing.
Letter to City of Bozeman
Re: Parkview Crossings – Preliminary Plat Comment Response
Bozeman, MT
August 16, 2021
Page 5 of 5
L:\193211\_Preliminary Plat\_Response\_City Cover Letter Response.doc
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