HomeMy WebLinkAboutEngineeringConditionsResponseLetter_08232021 E IMI G FIIF E IVII tM4VGI&
August 23, 2021
City of Bozeman Engineering Dept.
Attn: Cody Flammond
20 E. Olive Street
P.O. Box 1230
Bozeman, MT 59771-1230
RE: Oak & Cottonwood Apartments, Master Site Plan Review Application No. 20433
Dear Cody,
The following is a transcription of your Development Review Engineering Division Comments,
along with responses (in bold italics) detailing how each item is addressed.
1. BMC 38.410.060 (C) -The applicant must provide a mutual access easement for access
to both lots prior to master site plan approval.
Attached to this submittal is a draft "Shared Access Easement"and Exhibit provided
for review.
2. BMC 38.410.060 (C) -The applicant must provide a drainage easement for drainage
crossing lot boundaries prior to master site plan approval.
Attached to this submittal is a draft "Storm Water Drainage Easement"and Exhibit
provided for review.
3. BMC 38.410.060 (C) -The applicant must provide correspondence from NorthWestern
Energy indicating if the existing lighting easement along the boundary of Lots 4 and 5 is
necessary.
Northwestern Energy has indicated that the existing lighting easement is unnecessary
for the delivery of their services. Streetlights for the entirety of Flanders Creek
subdivision have been installed and are funded through a special improvements
lighting district.
4. Sewer and Water Pipeline and Access Easement-The submitted easement is
acceptable. The applicant must provide the original executed easement to the City of
Bozeman Engineering office prior to Master Site Plan approval.
406.581.4097 MCOTTERMAN@CADDISENG.COM PO BOX 11805,BOZEMAN, MT 59719 WWW.CADDISENG.COM
The proposed water and sewer routing has been revised since preparation of the
original easement. Attached to this submittal is a draft "Shared Access Easement"
and Exhibit provided for review.
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1. Montana Post-Construction Storm Water BMP Design Guidance Manual -Seasonal
High Groundwater-The proposed project is located in an area that is known to have
seasonally high groundwater. The applicant must demonstrate that seasonal high
groundwater will not impact the function or maintenance of the proposed facilities.
Industry guidance recommends a three-foot minimum separation from the bottom of
the proposed facility to the underlying groundwater table.
The existing storm water facility found within the open space to the north of the site
provides evidence of seasonal groundwater at the bottom of pond elevation of
4,719.00 feet. The proposed storm water ponds are perched above the existing pond
with bottom of pond elevations of 4,723.05 feet and 4,724,60. The proposed ponds
are located 4.05 feet to 5.60 feet above the seasonal high groundwater level.
2. DSSP Section 11.13 -The applicant must provide a storm drainage plan that includes all
the required elements of DSSP Section II.B. The submitted storm drainage plan does not
present enough information to complete review of the stormwater design.
a. In addition to the elements specified in DSSP Section 11.6, the applicant must
address the following:
i. The applicant must demonstrate how the design satisfies the standards
requirements for each drainage basin.
Storm water design calculations clarifying how the design satisfies the standards for
each drainage basin have been added to the design report.
ii. The storm drainage plan contains two paragraphs addressing the halfinch
requirement that contain different areas and volumes. The applicant
must assess which paragraph presents the correct information and
remove the incorrect paragraph.
The extra paragraph addressing the half inch requirement has been corrected.
iii. The applicant must provide a means for the drainage in Drainage Area 3
to reach the intended destination.
A curb inlet and outlet pipe have been added at the northernmost extent of Drainage
Area 3. Details on the curb inlet are provided on Sheet C1.3.
iv. The applicant must demonstrate the adequacy of all conveyance
infrastructure.
Design calculations demonstrating the adequacy of all conveyance infrastructure
(pipes& sidewalk chases)have been added to the design report.
3. DSSP Section 11.13.5—The applicant must include all the elements indicated in DSSP
Section 11.13.5 in the Storm Drainage Facility Maintenance Plan for all the stormwater
infrastructure on site.
The storm drainage facility maintenance plan has been revised to include clarification
on the responsible party and schedule of maintenance activities.
4. The subdivision stormwater ponds north of the development are in a degraded state
and no longer provide the designed capacity. The ponds must be restored to the original
design upon future development of the site. Please see attached inspection report.
The applicant has been coordinating maintenance and reconstruction activities with
the Flanders Creek HOA. The applicant is contributing financially toward the HOA's
correction plan.
5. BMC 38.540.020 M -The applicant must identify snow storage areas on the Site Plan for
the parking areas. Snow removal storage areas must be sufficient to store snow
accumulation on site. Such areas shall not cause unsafe ingress/egress to the parking
areas, shall not cause snow to be deposited on public rights-of-way, shall not include
areas provided for required parking access and spaces, and shall not be placed in such a
manner as to damage landscaping.
Snow storage areas are identified on the General Civil Plan (Sheet C1.1)and the Site
Grading & Drainage Plan (Sheet C1.2).
MlRtQr Risyht
1. BMC 38.410.130 (A) (1) Water Rights-The applicant must contact Griffin Nielsen with
the City Engineering Division to obtain a determination of cash-in-lieu of water rights
(CILWR). CILWR must be paid prior to site plan approval.
Written confirmation from Brian Heaston of the City Engineering Department is
included with this submittal, showing that the previously provided cash-in-lieu of
water rights were sufficient for the project.
1. BMC 38.410.070 —The City Engineering Division is not in agreement with the alignment
of the sanitary sewer main that crosses Oak Street. The applicant is encouraged to work
with the Northwest Crossing development and direct flows into their future system.
The applicant has been working with the Northwest Crossing Development team to
ensure that we can direct flows into their future system. This project will now divert
flows into the existing sewer main in Twin lakes Avenue which will be diverted
northward at Rosa Way as a part of the infrastructure improvements approved with
Northwest Crossing.
2. BMC 38.410.070 -The wastewater calculations in the design report utilize outdated
average flow rate values from the DSSP. The applicant must use the values from the
2015 Wastewater Collection Facilities Plan Update. These values are 2.17 people per
dwelling unit and 64.4 gallons per capita per day.
Wastewater flow calculations have been updated to use 2.17 people per dwelling unit
and 64.4 gallons per capita per day.
3. The following offsite improvements are required to be completed and approved by the
City prior to Master Site Plan Approval:
a. Cottonwood Sanitary Sewer Diversion
b. Davis Lift Station
c. Norton East Ranch Interceptor
Acknowledged.
1. DSSP V.D.1-The alignment of all water, sanitary sewer, and storm sewer mains and
services shall be arranged so that there is a minimum of ten feet of horizontal
separation between these lines and with any gas lines, power lines, communication
lines, utility poles or other above-grade utility structures, and street lights.
a. The dry utilities are too close to the water services for Building 1.
b. The services for Building 4 are too close to the fire hydrant.
The proposed water and sanitary sewer mains and service locations have been revised
to address the items noted above.
2. Water Riser Room -The applicant must show the mechanical room dimensions on the
site plans. See the attached pdf showing the recommended mechanical room sizes
based on pipe size lay lengths. Please contact John Alston (jalston@bozeman.net) the
City's water and sewer superintendent if additional questions arise.
Each building includes a mechanical room with interior dimensions of 4.5'x11.5' The
mechanical rooms are sufficiently sized to meet the required pipe size lay lengths
provided.
3. BMC 38.410.070-The applicant must align services perpendicular to the water main
from the water main to the easement line. Past the easement line the services may
angle to reach the desired location.
All water services are now shown as perpendicular to the water main until they reach
the easement line.
4. BMC 38.410.070-The applicant must show all curb boxes at the easement line on the
site plan.
Curb box locations are now shown on the site plan.
Transnortat+nn
1. BMC 38.220.080 (A) 2.g Traffic Generation— In addition to the peak hour trip
generation estimate provided, the applicant must submit a daily trip generation value to
the City to determine whether a traffic impact study is required.
A revised traffic estimate and request for waiver is attached to this submittal. The
letter has been updated to also include daily trip generation values from the
10thGeneration ITE Trip Generation Manual.
1. City of Bozeman Resolution 5076, Policy 1 -The applicant must provide and file with the
County Clerk and Recorder's office executed Waivers of Right to Protest Creation of
Special Improvement Districts (SID's) on City standard form for the following:
a. Street improvements to Cottonwood Road between Durston Road and Baxter
Lane including lighting, signalization, paving, curb/gutter, sidewalk, and storm
drainage.
b. Street improvements Oak Street between Ferguson Avenue and Laurel Parkway
including lighting, signalization, paving, curb/gutter, sidewalk, and storm
drainage.
c. Street improvements to Flanders Way between Twin Lakes Avenue and Flanders
Creek Avenue including lighting, signalization, paving, curb/gutter, sidewalk, and
storm drainage.
d. Street improvements to Twin Lakes Avenue between Oak Street and Annie
Street including lighting, signalization, paving, curb/gutter, sidewalk, and storm
drainage.
e. Street improvements to Flanders Creek Avenue between Flanders Way and
Annie Street including lighting, signalization, paving, curb/gutter, sidewalk, and
storm drainage.
f. Street improvements to Sherwood Way between Laurel Parkway and
Cottonwood Road including lighting, signalization, paving, curb/gutter, sidewalk,
and storm drainage.
g. Street improvements to Annie Street between Laurel Parkway and Cottonwood
Road including lighting, signalization, paving, curb/gutter, sidewalk, and storm
drainage.
h. Intersection improvements at Cottonwood Road and Baxter Lane including
lighting, signalization/channelization, paving, curb/gutter, sidewalk, and storm
drainage.
i. Intersection improvements at Cottonwood Road and Oak Street including
lighting, sign alization/channelization, paving, curb/gutter, sidewalk, and storm
drainage.
j. Intersection improvements at Cottonwood Road and Durston Road including
lighting, sign alization/channelization, paving, curb/gutter, sidewalk, and storm
drainage.
k. Intersection improvements at Sherwood Way and Cottonwood Road including
lighting, signalization/channelization, paving, curb/gutter, sidewalk, and storm
drainage.
I. Intersection improvements to Annie Street and Cottonwood Road including
lighting, sign alization/channelization, paving, curb/gutter, sidewalk, and storm
drainage.
m. Intersection improvements to Annie Street and Laurel Parkway including lighting,
signal ization/channelization, paving, curb/gutter, sidewalk, and storm drainage.
n. Intersection improvements to Sherwood Way and Laurel Parkway including
lighting, sign alization/channelization, paving, curb/gutter, sidewalk, and storm
drainage.
o. Intersection improvements to Twin Lakes Avenue and Oak Street including
lighting, sign alization/channelization, paving, curb/gutter, sidewalk, and storm
drainage.
p. Intersection improvements to Laurel Parkway and Oak Street including lighting,
signalization/channelization, paving, curb/gutter, sidewalk, and storm drainage.
The document filed must specify that in the event an SID is not utilized for the
completion of these improvements, the developer agrees to participate in an alternate
financing method for the completion of the improvements on a fair share,
proportionate basis as determined by square footage of property, taxable valuation of
the property, traffic contribution from the development, or a combination thereof. The
applicant must provide a copy of the filed SID waiver prior to master site plan approval.
Attached to this submittal is a signed Waiver of Right to Protest document addressing
each of the required waivers listed above.
ENGINEERING ADVISORY COMMENTS:
1. Plans and Specifications for water and sewer improvements, prepared and signed by
a professional engineer (PE) registered in the State of Montana, must be provided to
and approved by the City Engineer. The applicant shall also provide professional
engineering services for construction inspection, post-construction certification, and
preparation of mylar record drawings. Construction shall not be initiated on the
public infrastructure improvements until the plans and specifications have been
approved and a preconstruction conference has been conducted.
Acknowledged.
2. DSSP Fire Service Line Standard -The applicant must prepare plans and specifications for
any fire service line in accordance with the City's Fire Service Line Policy. The plans must
be prepared by a Professional Engineer and be provided to and approved by the City
Engineer prior to initiation of construction of the fire service or fire protection system.
The applicant must also provide Professional Engineering services for construction
inspection, post-construction certification and preparation of mylar record drawings. Fire
service plans, and domestic services 4" or larger, must be a standalone submittal,
separate from the site plan submittal. City of Bozeman applications for service must be
completed by the applicant.
Acknowledged.
Please don't hesitate to contact me if you have any questions or need any additional information
to complete your review of this project.
Sincerely,
dtftto tjE., P.L.S.
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