HomeMy WebLinkAbout14_Cannery District Sewer Engineers Report_3-31-2020
Sewer Engineer’s Report
Cannery District PUD
Building ‘J’ Update
March 2020
For Submittal to:
City of Bozeman Engineering Department
20 East Olive
Bozeman, MT 59715
Prepared by:
Stahly Engineering and Associates
851 Bridger Drive, Suite 1
Bozeman, MT 59715
(406) 522-9526
Sewer Engineer’s Report 1 3/27/2020
Engineer’s Sewer Report
Contents
Note: The Engineer’s Report format for the Cannery District’s Sewer report follows
DEQ-2 organization. Additional information required by the City of Bozeman Design
Standards is added where required.
Report Narrative
Chapter 10 – Engineering Reports & Facility Plans
11.1 Engineering Report
11.11 Problem Defined
11.12 Design Conditions
11.13 Impact on Existing Wastewater Facilities
11.14 Project Description
11.15 Design Criteria
11.16 Site Information
11.17 Environmental Impacts
Figures and Tables
Figure 1. Vicinity Map
Figure 2. Sewer Site Plan (included separately)
Table 1. Cannery District Sewer Flow Estimates
Table 2. Capacity of 8” and 10” SDR 35 PVC Sewer Main
Appendices
A Table 1. Estimated Water Use
Sewer Engineer’s Report 2 3/27/2020
11.1 Engineering Report
The Cannery District is a multi-phase development located in the City of
Bozeman on the north side of East Oak Street and Rouse Avenue, north of
the Gallatin County Fairgrounds. The existing property consisted of several
parcels of land totaling approximately 12.22 acres.
The development consists of four phases. The first phase, which was
completed in 2016, consisted of remodeling four existing buildings originally
constructed as part of the original pea canning operation in 1917. Phases 2, 3
and 4 involve the construction of six new buildings on the Cannery District
property. Phases 2 and 4 improvements were completed in 2018, Phase 3
improvements are currently under construction and are anticipated to be
completed in the summer of 2020. The final site building, Building ‘J’, will
begin construction in the fall of 2020 after plan approval from the City. In
addition to Building ‘J’, the Northwest Parking Lot will be constructed as a site
plan modification to Building O. Construction of the Northwest Parking Lot is
planned to happen in the summer of 2020.
This report addresses the sewer improvements associated with the final
building construction of the Cannery District PUD (Building ‘J’) and compares
the originally estimated sewer demands with the demands based on actual
uses of the built-out development. The wastewater flows Building ‘J’ project
was accounted for in the design of all four phases of the Cannery District
PUD.
The developer’s contact information is:
Cannery District Partners, LLC
113 East Oak Street, Ste 4A
Bozeman, MT 59715
Water supply and wastewater treatment will continue to be provided by the
City of Bozeman’s municipal systems. The system owner’s contact
information is:
City of Bozeman Public Service Department
PO Box 1230
Bozeman, MT 59771-1230
The location of the Cannery District is shown on the Vicinity Map in Figure 1.
See Figure 2 for the overall sewer system plan.
Sewer Engineer’s Report 3 3/27/2020
Figure 1. Vicinity Map, Bozeman, Montana
11.11 Problem Defined
City of Bozeman sewer mains were constructed in 1917 to serve the original
buildings. The previously constructed Phase 1 and 2 sewer upgrades
replaced these original sewer mains and provide the backbone of the
infrastructure needed to serve the remaining Cannery District phases. The
remaining Building ‘J’ requires only additional sewer services. The location of
the previously constructed sewer mains, and proposed sewer services are
shown in Figure 2, which is included separately.
11.12 Design Conditions
The initial sewer flow estimated contributed by the Cannery District was
determined using wastewater flow rates for zoned undeveloped areas from
the City of Bozeman Design Standards and Specifications Policy, Table V-1.
Table V-1 shows a flow rate of 2,000 Gal./Acre/Day for zoning designation B-
2. This water use estimate using this flow rate resulted in a design peak hour
flow of 212 gpm.
Since the Cannery District is largely built out, and the specific uses of the
proposed Building ‘J’ are known, water usage for this building and the entire
development was determined using the following values for average water
use rates:
Office/Retail 10,000 gal/yr/1,000 sf
Restaurant 165,000 gal/yr/1,000 sf
Residential 89 gal/day/person
Sewer Engineer’s Report 4 3/27/2020
The wastewater flow estimates are shown in Table 1. The revised estimated
sewer flows, based on actual developed uses, is reduced to 185 gpm, versus
the originally estimated 212 gpm.
Table 1: Cannery District Sewer Flow Estimates
Cannery District Water Use
Cannery District
Northside
PUD
Total w/
Northside
Phase
1
Phase
2
Phase
3
Phase
4
All
Phases
Acreage (acres) 3.761 3.29 3.237 1.946 12.234 3.024 15.254
Design Water Use Rate (gpd/acre)* n/a n/a n/a n/a n/a 2,000 n/a
Design Daily Water Use (gpd)* 9,710 1,068 8,248 1,636 20,662 6,048 26,710
Design Peaking Factor (Ave Day to Peak Hour) 10 10 10 10 10 10 10
Design Peak Hour Flow (gpm) 67 7 57 11 143 42 185
* See detailed water use estimates organized by phase and buildings based on actual use areas in Appendix.
The previously constructed Phase 1 sewer network consists of both 8” and
10” SDR 35 PVC sewer mains. 8” SDR 35 PVC sewer mains installed at the
minimum slope of 0.4% have a flow capacity of 312.8 gpm using 75% of the
flow depth of the pipe as required by the City of Bozeman Design Standards
and Specifications Policy.
10” SDR 35 PVC sewer mains installed at the slope of 0.3% have a flow
capacity of 491.2 gpm using 75% of the flow depth of the pipe. See Table 2
below for the parameters used in the flow calculation.
Table 2: Capacity of 8” and 10” SDR 35 PVC Sewer Main
Capacity of 8" and 10" SDR 35 PVC Sewer Pipe
Status Existing &Proposed Proposed
Location Cannery District Cannery District
Pipe Material 8" SDR 35 PVC 10" SDR 35 PVC
Pipe Diameter (in) 8 10
Minimum Pipe Slope (ft/ft) 0.004 0.003
Coefficient of Roughness (n) 0.013 0.013
Depth in Pipe at 75% Full (in) 6 7.5
Depth of Flow (ft) 0.5 0.625
Pipe Radius (in) 4 5
Pipe Radius (ft) 0.33 0.42
Wetted Perimeter 1.40 1.75
Area of Flow (ft2) 0.28 0.44
Hydraulic Radius 0.20 0.25
Velocity (ft/sec) 2.48 2.49
Maximum Pipe Flowrate (gpm) 312.8 491.2
Peak Hour Flow (gpm) 185 185
Peak Flow % of Max Capacity 59.29% 37.76%
Sewer Engineer’s Report 5 3/27/2020
The existing 8” and 10” sewer mains constructed in previous phases has
enough capacity to convey the peak flows from all four phases of the Cannery
District, as well as flows from the existing Northside PUD.
11.13 Impact on Existing Wastewater Facilities
Most of the sewer network for the Cannery District was completed during
previous phases. The proposed Building ‘J’ does not include any main
extensions but requires new sewer services. During construction of Building
‘J’, existing sewer services within the Cannery District and Northside PUD will
remain in service.
11.14 Project Description
Cannery District Building ‘J’ located in the PUD Phase 2 area is the final
building to be constructed in the development.
The construction of Phases 1 and 2 has provided most of the infrastructure
needed to serve the Cannery District development. The proposed BLDG J 6”
sewer service will be connected to the previously-installed 8” main located
west of the proposed building. The existing 8” main flows north to the existing
10” main which then flows west to connect to the offsite sewer main located in
Rouse Avenue (see Figure 2).
11.15 Design Criteria
The Cannery District sewer main extensions were designed in accordance
with Montana Department of Environmental Quality Circular 2, Montana
Public Works Standards and Specifications, City of Bozeman Modifications to
Montana Public Works Standards and Specifications, the Uniform Plumbing
Code, and the City of Bozeman Wastewater Facility Plan.
11.16 Site Information
A Geotechnical Report was prepared by Allied Engineering Services, Inc. for
the Cannery District site. The report identified the site to contain fine grained
soils overlying gravel deposits. Geotechnical borings have determined the
general soil profile consists of 1.5 to 7.0 feet of fine grain silt and clay
overlying alluvial gravel. Estimated depth to groundwater obtained from the
geotechnical borings is 6.5 -11 feet. If mains are installed during high
groundwater times dewatering may be required.
11.17 Environmental Impacts
Continued use and new extensions of City of Bozeman municipal sewer
mains has the least environmental impact. No new environmental impacts will
be caused by these sewer main extensions.
Figure 2
Sewer Site Plan
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Appendix
TABLE 1: Detailed Cannery District Water Usage 5/15/2020
Cannery District Phase 1 Area **Peak Hr Flow
Use by Building (gsf)gpd/1000 sf GPD (ac-ft/yr)(gpm)
Cannery Building (Bldg E)
Office/Retail 16,897 30 507 0.57 3.5
Restaurant/Bar 7,663 500 3,832 4.29 26.6
Building Common Area 3,773 30 113 0.13 0.8
Subtotal 28,333 4,452 4.99 30.9
Cannery Complex (Bldg F)
Office/Retail 7,621 30 229 0.26 1.6
Restaurant/Bar 7,505 500 3,753 4.20 26.1
Building Common Area 625 30 19 0.02 0.1
Subtotal 15,751 4,000 4.48 27.8
Canning Warehouse (Bldg G)
Office/Retail 14,041 30 421 0.47 2.9
Restaurant/Bar 1,365 500 683 0.76 4.7
Building Common Area 3,066 30 92 0.10 0.6
Subtotal 18,472 1,196 1.34 8.3
Boiler House (Bldg H)
Office 2,100 30 63 0.07 0.44
Total of Phase 1 9,710 10.88 67.43
Cannery District Phase 2 Area **Peak Hr Flow
Use by Building (gsf)gpd/1000 sf GPD (ac-ft/yr)(gpm)
Building J
Office 13,602 30 408 0.46 2.8
Subtotal 13,602 408 0.46 2.8
Building K
Office 3,245 30 97 0.11 0.7
Gym 4,607 100 461 0.52 3.2
Building Common Area 3,391 30 102 0.11 0.7
Subtotal 11,243 660 0.74 4.6
Total of Phase 2 1,068 1.20 7.4
Cannery District Phase 4 Area **Peak Hr Flow
Use by Building (gsf)gpd/1000 sf GPD (ac-ft/yr)(gpm)
Bldg N
Office/Retail 8,712 30 261 0.29 1.8
Building Common Area 1,584 30 48 0.05 0.3
Subtotal 10,296 309 0.35 2.1
Bldg O
Office/Retail 14,378 30 431 0.48 3.0
Restaurant/Bar 1,642 500 821 0.92 5.7
Building Common Area 2,504 30 75 0.08 0.5
Subtotal 18,524 1,327 1.49 9.2
Total of Phase 4 1,636 1.83 11.4
Cannery District Phase 3 Area **Peak Hr Flow
Use by Building (gsf)gpd/1000 sf GPD (ac-ft/yr)(gpm)
Bldg L
Office/Retail 14,926 30 448 0.50 3.1
*Residential 7,142 8.00 49.6
Subtotal 7,590 8.50 52.7
Bldg M
Office 21934 30 658 0.74 4.6
Total of Phase 3 8,248 9.24 57.3
TOTAL ALL PHASES 20,662 23.14 143.5
*Residential Use calculated using 89 gal/person/day, 80.25 estimated people
**Peaking Factor used for Avg Day to Peak Hour 10
Average Water Use
Average Water Use
Average Water Use
Average Water Use