HomeMy WebLinkAboutPreAp Response Letter_051021 1
r A
LAND SURVEYIN
May 10, 2021
City of Bozeman Engineering Dept.
Attn: Griffin Nielsen, Engineer 1
20 E. Olive Street
P.O. Box 1230
Bozeman, MT 59771-1230
RE: Gran Cielo Subdivision, Phase 1, Multifamily Lots, Lot 5, Block 6 and Lot 3, Block
5, Site Plan Review Application No.19479
Dear Griffin,
The following is proposed on two multifamily lots within Gran Cielo Subdivision, Phase 1:
Lot 5, Block 6 is proposed to have two duplex units and one triplex unit. All buildings on this lot
will be 38.5 feet tall. Each dwelling unit has 2,186 sq.ft. of living space. The lot has 23 parking
spaces for all of the units.
Lot 3, Block 5 is proposed to have on duplex unit and one triplex unit. Both buildings on this lot
will be approximately 28 feet tall. Each dwelling unit has 2,064 sq.ft. of living space. The lot has
18 parking spaces for all of the units.
The following is a transcription of your Concept Plan review memorandum that applies to each of
these lots, along with responses (in bold italics) detailing how each item is addressed.
1. BMC 38.410.080 and 40.04.500.A: Requirement to control and reduce stormwater
pollutants -
a. A stormwater drainage/treatment grading plan and maintenance plan for a
system designed to treat the first 0.5 inch of stormwater to remove solids,
silt, oils, grease,and other pollutants must be provided to and approved with
the Site Plan application.The drainage design must also comply with
subdivision drainage design. If the intent is to utilize capacity within the
subdivisions system the applicant must provide the relevant section of the
subdivisions design report demonstrating capacity.The plan must
demonstrate adequate site drainage (including sufficient spot elevations),
storm water detention/retention basin details (including basin sizing and
discharge calculations,and discharge structure details), storm water
discharge destination,and a storm water maintenance plan.The approved
I
T: 406.581.4097 E: MCOTTERMAN@CADDISENG.COM I PO BOX 11805,BOZEMAN, MT 597191 WWW.CADDISENC5.COM
stormwater maintenance plan must be incorporated into the Owners
Association Documents and a copy must be submitted prior to Site Plan
approval.
A design report has been included in this submittal that includes storm
water design. The storm water design meets City of Bozeman Standards
and complies with the subdivision drainage design. Verification of available
storage was also included in the Design Report. A grading and drainage
plan has been included in the drawings for each lot. A storm water
management plan is included in Appendix E of the Design Report.
b. In addition, the proposed project is located in an area that is known to have
seasonally high groundwater. The applicant must submit information on the
seasonal high groundwater elevation with a site plan application and confirm
that 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.
Groundwater monitoring has been conducted in coordination of the
buildings currently under construction within Gran Cielo. Floor and
footing elevations have been specified at heights above the high
groundwater level. Stormwater facilities are proposed at surface with with
maximum depths of 1 foot, ensuring that groundwater will not be
encountered.
c. Adequate accessible snow storage must be designated on site.
Snow storage has been designated on each lot on the grading and
drainage plan sheet.
1. BMC 38.410.070. : Municipal water, sanitary sewer, and storm sewer system.
a. The applicant must submit an estimate for the developments peak hour
wastewater demand and verify if the estimates exceed the original estimate
for the property defined with the subdivision's wastewater report. The
estimate must be provided by a professional engineer registered in the state
of Montana.
A design report has been completed for these multi-family lots in Gran
Cielo Subdivision. This design report includes a sanitary sewer evaluation
based on the capacity of the original subdivision.
2. BMC 38.400.090.C.3.c and D.2: Access -
a. The drive access must meet the City's residential drive access separation
requirements from the adjacent property line.
The drive accesses proposed for each lot are set back a minimum of 5 ft
from the property lines.
b. The applicant must submit an estimate for the developments peak hour
vehicle trips generated by the development and verify if the estimates exceed
the original estimate for the lots defined with the subdivision's traffic impact
study.The estimate must be provided by a professional engineer registered
in the state of Montana. If the estimates exceeds the original estimate for the
lot an analysis of the increased impact must be provided.
A traffic variance request has been included in this application that
evaluates the proposed development and concludes that it will not impact
the anticipated peak hour traffic.
c. Laydown curb should be installed along the property line crossing the
parking area to delineate the public alley from the private site.
Concrete valley gutters are proposed along the property lines that adjoin
alleys. The concrete valley gutters will delineate the public alley from the
private site.
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,
Ma oflern, S.
20120\city submittal items\engineering preap narrative response letter.docx