HomeMy WebLinkAbout19 - Design Report - Cannery District Ph 3 - Sewer
Sewer Engineer’s Report
Cannery District PUD
Phase 3 Update
April 4, 2019
For Submittal to:
City of Bozeman Engineering Department
20 East Olive
Bozeman, MT 59715
Montana Department of Environmental Quality
Permitting and Compliance Division
Public Water and Subdivisions Bureau
PO Box 200901
Helena, MT 59620-0901
Prepared by:
Stahly Engineering and Associates
851 Bridger Drive, Suite 1
Bozeman, MT 59715
(406) 522-9526
Sewer Engineer’s Report 1 4/8/2019
Engineer’s Sewer Report
Contents
Note: The Engineer’s Report format for the Cannery District Phase 3 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. Detailed Cannery District Water Usage
Sewer Engineer’s Report 2 4/8/2019
11.1 Engineering Report
The Cannery District is a multi-phase development located on the north side
of East Oak Street and Rouse Avenue, north of the Gallatin County
Fairgrounds. The existing property consists of several parcels of land within
the City and County, with 5.24 acres within the City and 6.98 acres within the
county.
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. During this
phase, the original water and sewer infrastructure was replaced and
upgraded to current City standards. Phases 2, 3 and 4 include the
construction of six new buildings on the Cannery District property. Phases 2
and 4 improvements were completed in 2018, leaving only the proposed
Phase 3 improvements unconstructed.
This report is addresses the improvements of the final phase of the Cannery
District PUD (Phase 3), and compares the originally-estimated sewer
demands with demands based on actual uses of the built-out development.
The wastewater flows from these future phases were accounted for in the
design of the previously constructed Phases 1, 2 and 4 system. All county
lands will be annexed prior to development in order to receive municipal
services for the new buildings.
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 4/8/2019
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 phase 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 Phase 3 buildings are known, water usage for this phase 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 4/8/2019
The wastewater flow estimates are shown in Table 1. The revised estimated
sewer flows, based on actual developed uses, is reduced to 191 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 1,895 8,248 1,636 21,489 6,048 27,537
Design Peaking Factor (Ave Day to Peak Hour) 10 10 10 10 10 10 10
Design Peak Hour Flow (gpm) 67 13 57 11 149 42 191
* 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) 191 191
Peak Flow % of Max Capacity 61.13% 38.93%
Sewer Engineer’s Report 5 4/8/2019
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
The majority of the sewer network for the Cannery District was completed
during previous phases. The proposed Phase 3 does not include any main
extensions, but requires new and relocated sewer services. During
construction of Phase 3, existing sewer services within the Cannery District
and Northside PUD will remain in service.
11.14 Project Description
Cannery District Phase 3 is the fourth of four phases within the development.
It consists of the construction of two new buildings (Buildings ‘L’ and ‘M’ as
shown in Figure 2).
The construction of Phases 1 and 2 has provided the majority of the
infrastructure needed to serve the remaining phases. Sewer services will be
connected to the previously-installed 10” main that flows from west to east
along the north side of the proposed buildings.
Building ‘L’ will be a mixed-use building containing office and residential units;
it will have an 8” sewer service line and connect to the adjacent 10” main.
Building ‘M’ will be an office building and connect to the existing 4” sewer
service line currently being utilized by Building ‘D’ (within the Northside PUD).
Building ‘D’ will get a new, re-routed 4” sanitary service connecting into the
same 10” sewer main, approximately 70 feet east of its current connection
point (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
Sewer Engineer’s Report 6 4/8/2019
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
OAK STREETSTORMWATERRETENTION BASIN/SNOW STORAGESDSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS30 SPACES40 SPACES15 SPACES22 SPACES22 SPACES20 SPACES9 SPACES6 SPACES8 SPACES23 SPACES13 SPACES 11 SPACESSDSDSD SDSDSDWATERTOWERBLDG OBLDG HBLDG NBLDG GBLDG FBLDG KBLDG JBLDG CBLDG DBLDG BBLDG A32 SPACES29 SPACESPARKING PLAZA14 SPACESEXISTINGFAIRGROUNDSACCESS
ROUSE AVE RAIL TRAILTRASHTRASHTRASH20' ROW FOR OAKSS SS SS SS
SS SS SS SS SS
SD
SD
SD SD SD SD SD SD
SD
8''W8''W8''W8''W8''W8''W8''W8''WSDSDSTORIESSS SS SSUSE DESIGNATIONGROSSAREA(SF)PHASE 4BLDG N5,412210,296OFFICESSSSSSSSSSSSSSSSSSSSSSSS SS SS SS
SSSSSSSSSSSSSSSSSSSSSSSSBLDG ESD SD
SD SD SD SD SD SD SD SD SD
SD
SDSDSDSDSDSDSDSD SD SD SD SD SDSDSDSD
10 SPACESSS
SS
SS SS
SSSS5 SPACES 25 SPACESTOWER TRAIL TRASHSD8 SPACES17 SPACESSS SS STORMWATER BIOSWALE/SNOW STORAGEPHASE/BUILDINGPHASE 1BLDG E9,231428,333RETAIL, RESTAURANT, OFFICEBLDG F12,0201&215,751RETAIL, BREWERY, OFFICEBLDG G13,7601&219,324OFFICEBLDG H1,6001&22,100OFFICEFOOT-PRINT(SF)PHASE 2BLDG K8,9621+MEZZ11,838MEDICAL & OFFICENORTHSIDE PUD(EXISTING)SD SD SD
SDBIOSWALEBIOSWALE
PATIOPATIO PATIOBIOSWALEBIOSWALE
MAINT.
SSC LANED LANE
A LANE
B LANEG LANEA LANE
C LANE E LANESD SD SDSDSDSDSDSDSSSD SD SD109 E. OAK1285 N. ROUSESS SS SS
SS
SS SS105 E. OAK107 E. OAK115 E. OAK111 E. OAK117 E. OAK1237 N. ROUSE1251 N. ROUSEPROPERTY LINE1203 N. ROUSE113 E. OAKPROPERTY LINE
211 E. OAKPROPERTY LINEPROPERTY LINESS SS SS SDSDPATIO12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W 12''W 12''W 12''W 12''W 12''W 12''W 12''W 12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W12''W 12''W 12''W 12''W 12''W<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<SSSDSDSDPROPERTY LINESSSDSDSDOAK STREETBLDG J11,9001+MEZZ13,400HEALTH & EXERCISESSSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSD<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<TRASHBLDG M11 SPACESBLDG L13 SPACES16 SPACES11 SPACES13 SPACES9 SPACES9 SPACES27 SPACESRAIL TRAILLOADINGRAIL TRAILPHASE 3BLDG L17,946461,621OFFICE w/RESIDENTIAL ABOVEBLDG M8,1652+BSMT22,176OFFICE w/BASEMENT STORAGEPARKING PLAZA20 SPACESE LANEF LANE231 E. OAK221 E. OAK5 SPACES10 SPACESRESERVED RESIDENTIALCOVERED PARKING
RESERVED RES.COVERED PARKINGRESERVED RES.COVERED PARKINGRESERVED RESIDENTIALCOVERED PARKINGRESERVED RES.COMPACT. COV. PARKINGLOADINGBLDG O8,9501&318,524OFFICE, RESTAURANTTOTAL97,946203,363PH 1 SEWER MAINSAND SERVICES30' WIDE WATER-SEWER EASEMENTSBLDG M TO CONNECT TOBLDG D SERVICE. BLDG DTO GET RELOCATEDSERVICE AS SHOWN(DASHED GREEN)30' WIDE WATER-SEWER EASEMENTS30' WIDE WATER-SEWER EASEMENTSPROPOSED PHASE 3SERVICE (DASHED GREEN)CANNERY DISTRICTPHASE 3 EXTENTSIN FEETPROFESSIONALENGINEERS &SURVEYORSCANNERY DISTRICTPHASE 3 STAHLYENGINEERING& ASSOCIATESCANNERY DISTRICTPARTNERS, LLCSEWER SITEPLANFIGURE 2
Appendix
TABLE 1: Detailed Cannery District Water Usage 4/3/2019
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 1,500 30 45 0.05 0.3
Gym 11,900 100 1,190 1.33 8.3
Subtotal 13,400 1,235 1.38 8.6
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 1,895 2.12 13.2
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 21,489 24.07 149.2
* 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