HomeMy WebLinkAboutPre-Plat narrative 08-01-18
BOZEMAN, GREAT FALLS, KALISPELL & SHELBY, MT | SPOKANE, WA | LEWISTON, ID | WATFORD CITY, ND | MEDIA, PA
406.586.0277
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234 East Babcock Street
Suite 3
Bozeman, MT 59715
August 1, 2018
City of Bozeman
Department of Community Development
20 East Olive Street
Bozeman, MT 59715
RE: PRELIMINARY PLAT FOR AMENDED LOTS 1 & 3 IN
BLOCK 4 OF THE KNOLLS AT HILCREST (J-483) NARRATIVE
TD&H JOB NO. B17-077
Dear Danielle,
The following responses address planning comments and preliminary plat supplements for
the above project.
The requested change on this amended plat is to remove the Non-Residential Use
restriction on Lots 1 & 3 in Block 4. This restriction was not imposed by the City of
Bozeman at time of Final Plat, but was part of the intended use by the developer for the
subdivision at that time. Those uses are no longer relevant or applicable. It is the intent of
the declarant/developer to designate these parcels as residential. This use is congruent
with the growth policy designation as residential, and R/O zoning with intent for multi-
household development. Lots 1 and 3 will be developed for multi-unit residential use.
Preliminary Plat Supplement O. Land Use- Planning Comment 1.0
The maximum number of household structures for Lot 1 and 3 was calculated using the
number of units on Lot 2 in Block 4 based on the parkland dedication. The original
subdivision has 76 single family residential lots and 1 multi household lot, a total of 3.64
acres of parkland was needed for the original plat of The Knolls at Hillcrest. The calculated
number of units for Lot 2 in Block 4 is 44.88 units for 4.266 acres which equates to 10.52
units/acre. Lot 1 in Block 4 has a calculated area of 0.726 acres which equates to 7.63
units. Lot 3 in Block 4 has a calculated area of 1.117 acres which equates to 11.75 units.
The total number of units for this amended plat is 19.38 units.
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Preliminary Plat Supplement P. Parks and Recreation- Planning Comment 2.0
The parkland for the amended plat was calculated based on the 19.38 additional units at
0.03 acres/unit. Which equates to 0.58 acres of parkland required for the amended plat.
With the additional 19.38 units added to the 120.88 existing units for the entire subdivision,
and the additional 1.84 acres of residential added to the existing 14.874 acres of
residential. The calculated net density of the entire subdivision with the amended plat is
8.39 units/acre, the calculated net density of the original subdivision is 8.13 units/acre. This
gives us an increase in net density of 0.26 units/acre. It is intended to provide cash in lieu
for the 0.58 acres of required parkland.
Preliminary Plat Supplement Q. Neighborhood Center Plan- Planning Comment 3.0
The Knolls HOA maintained park located within the subdivision serves as the neighborhood
center for Lots 1 and 3. The neighborhood center has public access and the following
amenities: 2 picnic tables with concrete pads, 2 waste containers, 1 dog station, 2 6-ft wide
accessible ramps, concrete walks, 23,405.5 square foot play area, and 2 park benches.
Public parking is permitted on Knolls Drive. Documentation of the neighborhood center is
attached.
Engineering Comment 1.0
The sewer capacity has been discussed with Shawn Kohtz and it is our understanding that
there will be a building restriction placed on the lots until the Front Street Sewer upgrade is
completed.
Engineering Comment 2.0
Cash in-lieu of water rights associated with the change in use for the two lots has b een
calculated by Brian Heaston. Lots 1 and 3 currently have a credit of 10 acre feet per year
available based on the cash in lieu of water rights payed for by the original plat. Typical
multi-family water use is calculated at 0.124 AF/year for purposes of cash in lieu of water
rights. A total of 80 multi-family units can be built with the remaining credit.
Engineering Comment 3.0
Water demands for the proposed change in use are shown in the table below.
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Existing Domestic Water Demands
Description
Number of
Units Population
Demand
(gpdpc)
Total
Demand
(gpd)
Peak
Day
Demand
(gpd)
Peak
Hour
Demand
(gpm)
Single Household Residence 76 2.54 200 38,608 96,520 80
Contiguous Hillcrest Expansion 65 2.54 200 33,020 82,550 69
Lots 1 & 3 Block 4 Residential 20 2.54 200 10,160 25,400 21
Community Center 1 13.71 200 2,742 6,855 6
Bed and Breakfast 1 13.71 200 2,742 6,855 6
Total Water Demand: 87,272 218,180 182
Proposed Domestic Water Demands
Description
Number of
Units Population
Demand
(gpdpc)
Total
Demand
(gpd)
Peak
Day
Demand
(gpd)
Peak
Hour
Demand
(gpm)
Single Household Residence 76 2.54 200 38,608 96,520 80
Contiguous Hillcrest Expansion 65 2.54 200 33,020 82,550 69
Lots 1 & 3 Block 4 Residential 20 2.54 200 10,160 25,400 21
Multi-Family Residential 8 2.54 200 4,064 10,160 7.1
Multi-Family Residential 12 2.54 200 6,069 15,240 10.6
Total Water Demand: 91,921 229,870 188
The community center and bed and breakfast shown in the table in red are assumed to be
for Lots 1 and 3 in Block 4. The Knolls Booster Station has a firm pump capacity of 384
gpm with the largest pump out of service which is based on the City of Bozeman’s Water
Facility Plan Updated July 2017. Therefore the Knolls Booster Station has sufficient
capacity to allow the change from non-residential to residential.
Standard Code Provisions.
1.0 The preliminary plat conforms to the requirements of the Unified Development Code of
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the Bozeman Municipal Code and the Uniform Standards of Subdivision Plats.
2.0 No mortgages exist on the property.
3.0 Water right have been calculated for the property.
4.0 Required utility easement have been dedicated on the Final Plat of the Knolls at
Hillcrest.
5.0 Waiver of Park Maintenance District has been filed with the annexation agreement and
is on file at the Clerk and Recorder’s office as document number 2226842.
6.0 Lots 1 and 3 currently contain irrigated lawn and are maintained on a regular basis.
7.0 The certificates listed in Sections 38.06.020 through 38.03.110 are shown on the
attached preliminary plat.
8.0 All preliminary plat requirements, as outlined in Article 41 are provided.
Sincerely,
Keith Waring PE
Project Manager
TD&H ENGINEERING