HomeMy WebLinkAbout010_SUD Ph3_PhasingPlanForConcomitantConstruction
Prepared for:
May 18, 2021
Stahly Engineering & Associates
South University District Phase 3 Major
Subdivision
Phasing Plan for Concomitant Construction
South University District Phase 3 Major Subdivision Phasing Plan to Facilitate Concomitant
Construction
Introduction
The intent of this proposed phasing plan is to establish a basis for a “concomitant construction”
approach—permitting the simultaneous, or near-to-simultaneous construction, of various infrastructure
elements and off and on-site improvements within SUD Phase 3 and its Restricted Blocks 1-4. Herein we
identify key components of the South University District (SUD) Ph 3 Major Subdivision that would be
considered ‘Common Subdivision Improvements’ and are integral connections within the City of
Bozeman’s transportation and utility networks. These Common Subdivision Improvements would need
to be financially guaranteed and installed before any grant of occupancy could occur on any of the 4
‘Restricted’ lots on Blocks 1-4.
If this Plan is approved, the City is being asked to provide a binding, written authorization for
“concomitant construction” and to permit a notice regarding said authorization on the SUD Phase 3
Final Plat.
Common Subdivision Improvements
Certain elements critical to the subdivision’s utility and transportation network have been identified,
with input from the City of Bozeman, that would be required to be installed by the property
developers—herein these are referred to as "Common Subdivision Improvements” and shown in yellow
on the enclosed “Infrastructure Improvements Phasing Exhibit”. These Common Subdivision
Improvements generally include extending Stucky Road from South 19th Ave east to the round-about at
South 14th Ave, and widening South 19th Ave along the entire western project boundary between Kagy
Blvd and Arnold St. They also include installing storm drainage improvements within the Park 4 lot that
receives runoff from Stucky and 19th Ave. A specific list of the Common Subdivision Improvements
follows:
Widen S 19th Ave from Kagy Blvd to Arnold St
o install 10-ft wide concrete sidewalk
o Pipe existing irrigation ditch
o Install irrigation, grass and trees within boulevard
o Improve existing traffic signal at Stucky Rd and S 19th Ave
o Install lighting along 19th Ave
Stucky Road from 19th Ave to 14th Ave- 48-ft width
o Stucky Road sidewalks on both sides of City Park, and along north side of road between
17th Ave and 19th Ave
o Install street lighting
Stucky Road 12” water main between 19th Ave and 14th Ave—approximately 1,510 LF
Stucky Road storm
o Approximately 100 LF of 18” storm main
o Approximately 340 LF of 24” storm main
o Approximately 340 LF of 30” storm main
o Approximately 190 LF of 36” storm main
o 8 catch basins
o 5 storm manholes
Stucky Road 8” sewer main—approximately 403 LF
S 17th Ave sewer main
o Connect to existing sanitary sewer main at the intersection of Kagy Blvd and Willow Way
o Install approx. 490 LF of 10” sewer main within Kagy Blvd
o Install approx. 1,414 LF of 8” sewer main within 17th Ave to the intersection of Stucky Rd
(with all-weather access road to manholes in 17th Ave ROW as needed)
Parkland Improvements
As mentioned previously, the 1.83-ac ‘City Park 4 ’lot will contain the stormwater detention pond that
accepts runoff from S 19th Ave, Stucky Rd, and S 17th Ave. The detention pond takes up 0.431 acres, but
the remaining 1.399 acres will be seeded, landscaped, and irrigated.
Miscellaneous Improvements
There is an existing 20-ft irrigation easement on the property that will be relocated within the Park 3
and Park 4 lots. The existing shallow ditch will be piped in a new 15” PVC pipe along the western edge
of the Park 3 and Park 4 lots.
Blocks 1 & 2 Improvements
Due to their proximity to each other and the initial ‘Common Subdivision Improvements ’the Block 1 & 2
Off-Site Improvements will both need to be constructed at the same time. Depending on the timing of
development, the first of these two Blocks to develop first will need to construct the developments for
both and create a payback district for the second developer.
Block 1 & 2 Off-Site Improvements
Block 1 & 2 Off Site Improvements proposed in this phasing plan and shown in blue on the enclosed
‘Infrastructure Improvements Phasing Exhibit ’generally include extending 17th Ave between Stucky
Road and Kagy Blvd, and the segment of State Street from South 19th Ave east to South 17th Ave. They
also include installing storm drainage improvements within the four ‘Common Open Space’ lots (two on
Block 1 and two on Block 2) lot that receive runoff from 17th Ave and State Street. A specific list of the
Common Subdivision Improvements follows:
S 17th Ave from Stucky Rd to Kagy Blvd- 47-ft width—approximately 1,400 LF
State St from S 19th Ave to S 17th Ave- 35-ft width—approximately 650 LF
8” Water mains in State St and S 17th Ave—approximately 740 LF & 1,404 LF respectively
8” Sanitary Sewer mains in State St—approximately 388 LF
Buried Stormwater retention basins (4) and associated mains
5’ concrete sidewalks along east and west sides of S 17th Ave
5’ concrete sidewalks along the north and south sides of State St.
10’ temporary* or permanent asphalt sidewalk along Kagy Blvd between S 19th Ave and S 17th
Ave (*depending on timing of improvements—if before Kagy Blvd reconstruction, a temporary asphalt path is
required)
Parkland Improvements
Parkland requirements will be determined by the nature of the development(s) proposed within each of
the Blocks at the Site Plan level, but the South University District Property Owners Association (POA) will
require each block to develop a proportionate share of the remaining undeveloped 14.01-acre ‘City Park
3’ lot. Block 1 will be required to develop 18.2% of Park 3, or 2.43 acres; Block 2 will be required to
develop 19.8% of Park 3, or 2.65 acres.
Miscellaneous Improvements
Development on either Block 1 or Block 2 will trigger the cash-in-lieu of Improvements (CILI)
requirements for the subdivision’s proportionate share of Kagy Boulevard.
Block 3 Improvements
The Block 3 Off-Site Improvements include the adjacent streets to the south and east, as well as the
portion of Arnold Street along the south boundary of the ‘City Park 3’ lot.
Block 3 Off-Site Improvements
Block 3 Off Site Improvements proposed in this phasing plan and shown in orange on the enclosed
‘Infrastructure Improvements Phasing Exhibit ’generally include extending 17th Ave between Stucky
Road and Arnold St, and constructing Arnold St. from South 19th Ave east to South 14th Ave. A specific
list of the Common Subdivision Improvements follows:
S 17th Ave from Stucky Rd to Arnold St- 47-ft width
Arnold St from S 19th Ave to S 14th Ave- 35-ft width
8” Water mains in Arnold St and S 17th Ave
8” Sanitary Sewer mains in Arnold St and S 17th Ave
Stormwater catch basins and associated mains
6’-wide, 6” thick concrete sidewalk along park frontage on east side of S 17th Ave and north side
of Arnold St.
Parkland Improvements
Parkland requirements will be determined by the nature of the development(s) proposed within each of
the Blocks at the Site Plan level, but the South University District Property Owners Association (POA) will
require each block to develop a proportionate share of the remaining undeveloped 14.01-acre ‘City Park
3’ lot. Block 3 will be required to develop 37.3% of Park 3, or 4.98 acres.
Miscellaneous
Depending on the timing of development of Block 3 and/or the property to the south of Arnold St, the
first to develop will need to construct both halves of Arnold St and create a payback district for the
second developer.
Block 4 Improvements
The Block 4 Off-Site Improvements generally include constructing the segment of S 14th Avenue and
Arnold Street adjacent to the property. Depending on the timing of development, the first of these two
Blocks to develop first will need to construct the developments for both and create a payback district for
the second developer.
Block 4 Off-Site Improvements
Block 4 Off Site Improvements proposed in this phasing plan and shown in green on the enclosed
‘Infrastructure improvements Phasing Exhibit ’generally include extending 14th Ave between Student Dr
and Arnold St, and the segment of Arnold Street from S 11th Ave east to S 14th Ave. A specific list of the
Common Subdivision Improvements follows:
S 14th Ave from Arnold St to Student Dr- 35-ft width
Arnold St from S 11th Ave to S 14th Ave- 35-ft width
8” Water mains in Arnold and S 14th Ave
8” Sanitary Sewer mains in Arnold St and S 14th Ave
Stormwater detention/retention basins and associated mains
Parkland Improvements
Parkland requirements will be determined by the nature of the development(s) proposed within each of
the Blocks at the Site Plan level, but the South University District Property Owners Association (POA) will
require each block to develop a proportionate share of the remaining undeveloped 14.01-acre ‘City Park
3’ lot. Block 4 will be required to develop 24.7% of Park 3, or 3.30 acres.
Miscellaneous
Depending on the timing of development of Block 4 and/or the property to the south of Arnold St, the
first to develop will need to construct both halves of Arnold St and create a payback district for the
second developer.
South 11th Ave was constructed in 2018 and there is a payback district associated with that project
allocated to Block 4.
STATE STREETSOUTH 17TH AVE
KAGY BLVDSOUTH 19TH AVESOUTH 17TH AVESTUCKY ROADSTUCKY ROADSOUTH 14TH AVE
STUDENT DRIVESOUTH 11TH AVESTUCKY ROADARNOLD STREETSOUTH 11TH AVE
SOUTH 14TH AVE
SOUTH 17TH AVEARNOLD STREETSOUTH 19TH AVE Proposed RestrictedBlock 1Lot 18.20 AcresProposed Block 1 CommonOpen Space Lot 10.09 AcresProposed Block 2 CommonOpen Space Lot 10.07 AcresProposed Block 1 CommonOpen Space Lot 20.07 AcresProposed RestrictedBlock 2Lot 18.60 AcresProposed Block 2 CommonOpen Space Lot 20.07 AcresProposed Right of Way6.37 Acres Proposed RestrictedBlock 3Lot 118.86 AcresProposed RestrictedBlock 4Lot 111.89 AcresCity Park 41.83 AcresCity Park 314.01 AcresExtents of Subdivisionimprovements to becompleted beforeoccupancy of any lot inthe SUD Ph 3 MajSubdivisionExtents of off-site improvements to be completed beforeoccupancy of Block 4 in the SUD Ph 3 Maj SubdivisionExtents of off-siteimprovements to becompleted beforeoccupancy of Block 3in the SUD Ph 3 MajSubdivisionExtents of off-siteimprovements to becompleted beforeoccupancy of Blocks 1or 2 in the SUD Ph 3Maj SubdivisionBlock 2 Portion of City Park 319.8%Block 4 Portion of City Park 324.7%Block 3 Portion of City Park 337.3%Block 1 Portion of City Park 4100%Block 1 Portion of City Park 318.1%P
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YFOR SUBDIVISION REVIEWPROFESSIONALENGINEERS &SURVEYORS1 OF 1INFRASTRUCTUREIMPROVEMENTSPHASING EXHIBITSUD PHASE 3SOUTH UNIVERSITYDISTRICTSTAHLYENGINEERING& ASSOCIATESRTR HOLDINGS II, LLCSUBDIVISIONIMPROVEMENTSBLOCK 3BLOCKS 1 & 2BLOCK 4PROPERTY BOUNDARY