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HomeMy WebLinkAbout015_PreliminarySewerEngineeringReportBlock4Engineering Report Sewer Main Extension South University District Phase 3 - Block 4 Site Plan Submittal Updated May 2023 Submitted 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) 522-8594 Sewer Mains 1 5/19/2023 Engineering Report Contents Note: The Engineering Report format 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 - General Information 11.11 Problem Defined 11.12 Design Conditions 11.13 Impact on Existing Wastewater Facilities 11.14 Project Description 11.15 Drawings 11.16 Design Criteria 11.17 Site Information 11.18 Alternate Selection/Analysis 11.19 Environmental Impacts Figures and Tables Figure 1. Vicinity Map Figure 2. C3.0 - Sewer Plan Table 1. Block 4 Sewer Flow Estimates Table 2. Capacity of 8” SDR 35 PVC Sewer Main Table 3. Capacity of Estimated Sewer Flows Appendices SUD Phase 3 Sewer Engineering Report Sewer Mains 2 5/19/2023 11.1 Engineering Report – General Information The proposed South University District (SUD) Phase 3 Block 4 Development is located southwest of the intersection of South 11th Avenue and Student Drive. This development will consist of 243 residential units with 655 bedrooms on an 11.89-acre lot. Six different building types consisting of 20 unique unit configurations within the buildings is proposed with this development. The intent of this project is to create a variety of building types to create a diverse neighborhood in a growing part of town adjacent to the Montana State University Campus. The project will be served by extension of City of Bozeman water and sewer mains throughout the project. Individual service lines will be provided to each block of units. City of Bozeman water and sewer mains currently exist along the North side of the project site along Student Drive. The developer’s contact information is: Capstone Builders Davis Maxwell 431 Office Park Drive Birmingham, AL 35223 Water supply and wastewater treatment will 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 Block 4 Development is shown on the Vicinity Map in Figure 1. Sewer Mains 3 5/19/2023 Figure 1. Vicinity Map, Bozeman, Montana 11.11 Problem Defined Sanitary sewer service will be provided by an existing 8” sewer main running along Student Drive and an existing 10” sewer main along the west side of the project going down S 14th Ave. The proposed sewer system improvements are shown on the Sewer Plan (Figure 2) at the end of this report. New sewer mains will be within combined water and sewer easements and street rights-of-way running through the property. The easements are 30’ wide. No trees are proposed within the water and sewer easements or within 10’ of water and sewer mains. Each building will have an individual sewer service from the building to the main through parking areas and internal streets. Sewer service sizes are anticipated to be 6” to the building but will be finalized during infrastructure design. Sewer Mains 4 5/19/2023 To avoid conflicts with water and sewer services, power and communication lines are typically placed in easements on the backs or sides of the buildings. 11.12 Design Conditions Estimated wastewater generation for Block 4 has been determined utilizing values provided in City Design Standards and Specifications Policy and is shown in Table 1. However, for sewer main sizing, typical City design flows are utilized. The estimated residential wastewater generation is based on the City of Bozeman Design Standards. Typical design flow is 89 gallons per day (gpd) per capita, with an average population of 2.11 people per home. In accordance with DEQ-2 a peaking factor of 3.91 was used to determine the peak hour flow rate. In accordance with City design standards, infiltration and inflow of 150 gpd/acre is added to the domestic wastewater generation. The total design flow from the Block 4 development is approximately 60,079 gpd, with a peak hour flow of 163.17 gpm. Table 1 – SUD Ph3 – Block 4 Estimated Sewer Use An 8” sewer main at minimum slope (0.4%) has sufficient capacity to provide sewer service for Block 4 at the estimated flow of 163.17 gpm. Table 2 shows that an 8” main has a 75% flow depth capacity of 313 gpm installed at a minimum slope of 0.4%. Site Area (acres)11.89 Bedrooms 655 Residential Occupants 655 Per Capita Use (gpd)89 Residential Flow (gpd)58,295 Commercial Area (sf)0 Commercial Use (gpd/1000 sf)0 Commercial Flow (gpd)0 Commercial and Residential Flows (gpd)58,295 Commercial and Residential Flows (gpm)40 Inflow & Infiltration (gal/ac/day)150 Inflow & Infiltration (gpd)1,784 Design Sewer Use + Inflow & Infiltration (gpd)60,079 Peaking Factor (PF)3.91 Design Sewer Peak Hour Flow 163.17 Sewer Mains 5 5/19/2023 Table 2 Capacity of 8" SDR 35 PVC Sewer Main 11.13 Impact on Existing Wastewater Facilities Off-site sewer impacts were evaluated as part of the phase 3 Subdivision infrastructure review process. The sewer flow contributions for the proposed development were determined using the City of Bozeman Design Standards. The proposed sanitary sewer main extensions that will serve the proposed development will connect to the existing 8” sewer mains in Student Dr. and 10” main on S 14th Ave at the north end of the site. All the sewer is then conveyed by the 10” sewer running in S 14th Avenue to the 10” main in Stucky Rd. then going north to Kagy Boulevard and down Willow Way. During the Subdivision planning phase of Phase 3, it was determined that the 10” main has adequate capacity to serve future development of SUD Phase 3, annexation of county properties along Willow Way, future development along Kagy Boulevard. Sewer flows generated in Phase 3 of the SUD development will be collected in the ‘Farmer’s Canal Drainage Basin’ as identified by the City. The new mains within the SUD Phase 3 subdivision were 8” and 10” and connect to the 10” sewer main in Willow Way that continues north to the 15” main in Lincoln Street west through 19th Avenue eventually ending up in the 18” main in Garfield Street near the Bozeman Gateway Subdivision. Flows generated by the SUD Phase 3 development were combined with the estimated flows from currently undeveloped parcels, as well as existing Sewer Main Location On-Site Pipe Diameter (in)8 Minimum Pipe Slope (ft/ft)0.004 Coefficient of Roughness (n)0.013 Depth in Pipe at 75% Full (in)6 Depth of Flow (ft)0.5 Pipe Radius (in)4 Pipe Radius (ft)0.33 Wetted Perimeter 1.40 Area of Flow (ft2)0.28 Hydraulic Radius 0.20 Velocity (ft/sec)2.48 Maximum Pipe Flowrate (gpm)312.8 Peak Hour Flow (gpm)163.2 Peak Flow % of Max Capacity 52% Sewer Mains 6 5/19/2023 developments (see Fig 3 in Appendix) to determine the impact of capacity within the downstream mains. The estimates for SUD Phase 3 Block 1, 2, 3, and 4 have been updated based on current proposed development programming and included in the calculations below in Table 3. Table 3 shows the combined flows of the Willow Way and Tai Lane subbasins, -- in addition to anticipated development of un-incorporated properties in the area -- and evaluates the capacity within the adjacent sewer collection system. The combined peak flows that eventually end up in the 15” Lincoln Street main are estimated to be 1,026 gpm; this includes a 90 gpm peak for MSU home football games (established from monitoring), plus an additional 23 gpm for infiltration within the sewer drainage sub- basins. The anticipated peak flow of 1,026 gpm is under the capacity of a 15” main at minimum slope (0.21%) flowing 75% full (1,212 gpm). The approximate 850 LF of sewer main installed within Kagy Blvd (extending west from the intersection of Willow Way) was conservatively sized as a 10” main flowing at only 70% Q/Q75. Table 3: Capacity of Estimated Sewer Flows 1 Slopes either proposed or as-built 2 150 gal/ac/day from COB Design Standards 11.14 Project Description The project description is provided at the beginning of the Engineering Report. 11.15 Drawings Please see sheet C3.0 Sewer Plan, at the end of this report which shows the proposed sewer improvements. Plan and profile drawings will be submitted with the infrastructure design submittals. 11.16 Design Criteria The Block 4 sewer main extensions will be designed in accordance with Montana Department of Environmental Quality Circular 2, and the City of Bozeman Design Standards and Specifications Policy. (in)(%)(gpd)(unitless)(gpm)(gpm)(gpm)(in)(gpm)(%) Lincoln 15 0.21%419,685 3.14 1,004 22 1,026 11.25 1,212 85% Willow 10 0.97%258,238 3.33 598 10 608 7.5 883 69% Kagy 10 0.28%130,345 3.58 324 10 334 7.5 475 70% Sewer Main Pipe Size Slope1 Avg Daily Flow Peaking Factor Peak Flow Infiltration2 Peak Flow + Infiltration Depth of Flow 75% Depth Capacity Flowrate Capacity Q/Q₇₅ Sewer Mains 7 5/19/2023 Construction specifications will be Montana Public Works Standards and Specifications (MPWSS), and the City of Bozeman Modifications to MPWSS. 11.17 Site Information The SUD Phase 3 Block 4 site is typical of Bozeman with fine-grained soils overlying gravel deposits. Geotechnical borings have determined the depth to gravel ranges from 7.5 to 11 feet. Estimated depth to groundwater obtained from the geotechnical borings is 8 to 9 feet. If mains are installed during periods of high groundwater, dewatering may be required. 11.18 Alternative Selection/ Analysis Due to the project’s location within the City of Bozeman, extension of public mains was the only sewer collection alternative. 11.19 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. 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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 - General Information 11.11 Problem Defined 11.12 Design Conditions 11.13 Impact on Existing Wastewater Facilities 11.14 Project Description 11.15 Drawings 11.16 Design Criteria 11.17 Site Information 11.18 Alternate Selection/Analysis 11.19 Environmental Impacts Figures and Tables Figure 1. Vicinity Map Table 1. SUD Phase 3 Sewer Flow Estimates Table 2. Capacity of 8” SDR 35 PVC Sewer Main Appendices Sewer Site Plan Sewer Capacity Analysis Map Sewer Mains 2 6/23/2020 11.1 Engineering Report The South University District Phase 3 subdivision is located within the City of Bozeman at the south-east corner of South 19th Avenue and Kagy Boulevard. This project will provide right of way dedications for South 17th Avenue, State Street and Stucky Rd (f/k/a Campus Blvd) and will create 4 developable lots—three of which will be restricted lots. The initial lot for development is Block 1 Lot 1 which is an approximate net 8.2-acre lot for subsequent site development. Site development for this subdivision phase is anticipated to be a commercial emphasis according to the Master Plan. The restricted, future development blocks (Blocks 2-4) are also included, but are not proposed for development at this time. The developer’s contact information is: RTR Holdings II, LLC. 22 Turtle Rock Court Tiburon, CA 94920-1300 Water supply and wastewater treatment will 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 South University District - Phase 3 is shown on the Vicinity Map in Figure 1. Sewer Mains 3 6/23/2020 Figure 1. Vicinity Map, Bozeman, Montana 11.11 Problem Defined The proposed sewer main extensions to serve the SUD Phase 3 Major Subdivision are shown in Figure 2 Sewer Site Plan. Sanitary sewer service will be provided by extending the existing 10” trunk main in Kagy Boulevard, installed during Phase 2 construction to the S 17th Ave mid-block access; from there, existing mains, 8” mains are proposed to extend through the new streets, S. 17th Avenue, State Street, and Stucky Rd. The new 8” mains will be stubbed into the lots for future extensions. This proposed sewer main size and configuration is in accordance with the 2015 Bozeman Wastewater Collection Facilities Plan Update. 11.12 Design Conditions The sewer flow contributed by the proposed South University District Phase 3 was determined using wastewater flow rates by zoned undeveloped areas per City of Bozeman Design Standards and Specifications Policy, Table V- 1. The site for Phase 3 Block 1, Lot 1 consists of a net lot area of approximately 8.2-acres. The commercial flow was estimated by applying the value from Table V-1 for Community Commercial of 2,400 gal/acre/day to this acreage. Sewer Mains 4 6/23/2020 For residential flow, the estimated flow is determined using an average daily flow rate of 89 gpd/person with 2.11 people per dwelling unit in accordance with the City of Bozeman Design Standards Utility Design Criteria. It was assumed that 60 residential units could be developed within future developments of Block 1. All analyses include an infiltration rate of 150-gallons/acre/day, and a peaking factor depending on population served in accordance with the City of Bozeman Sanitary Sewer System Design Criteria and MDEQ Design Standards. In Tables 1a and 1b, the on-site design sewer flow estimates for Phase 3 Block 1 and the entire Phase 3 subdivision are calculated using recommended flow rates for zoned undeveloped areas in Table V-1 of the City of Bozeman Design Standards and Specifications Policy. Table 1a: SUD Phase 3 Block 1 Sewer Flow Estimates Block 1 (acres)8.2 Estimated Flow (gpd/acre)2400 Lot 1 Commercial Flow (gpd)19,680 Residential Units 60 Residential Occupants (2.11/unit)126.6 Per Capity Use (gpd)89 Lot 1 Residential Flow (gpd)11,267 Commercial and Residential Flows (gpd)30,947 Commercial and Residential Flows (gpm)21 Peaking Factor 3.98 Peak Flow (gpm)85.60 I&I Rate (gal/acre/day)150 I&I Flow (gpd)1,230 I&I Flow (gpm)0.85 Total Daily Flow (gpm)86.45 An 8” sewer main at minimum slope (0.4%) has sufficient capacity to provide sewer service for Phase 3 Block 1 at the estimated flow of 86.45 gpm. Table 2 shows that an 8” main has a 75% flow depth capacity of 313 gpm installed at a minimum slope of 0.4%. Impacts of the entire subdivision on the sewer basin are addressed in Section 11.13. Sewer Mains 5 6/23/2020 Table 1b: SUD Phase 3 Block 1 Sewer Flow Estimates SUD Phase 3 Lot Area Average Water Usage Rates (sf) (ac) *(gal/ac/day) (gpd) (gpm) BLOCK 1** 458,500 10.5 30,947 21.49 BLOCK 2 495,062 11.4 1,456 16,548 11.49 BLOCK 3 932,671 21.4 1,456 31,175 21.65 BLOCK 4 615,844 14.1 1,950 27,569 19.14 Infiltration 2,502,077 57.4 150 8,616 5.98 Total Estimated Average Ph 3 Flows 114,854 79.76 Table 2 Capacity of 8" SDR 35 PVC Sewer Main Status Proposed Location Phase 3 Pipe Material 8” SDR 35 PVC Pipe Diameter (in) 8 Minimum Pipe Slope (ft/ft) 0.005 Coefficient of Roughness (n) 0.013 Depth in Pipe at 75% Full (in) 6 Depth of Flow (ft) 0.5 Pipe Radius (in) 4 Pipe Radius (ft) 0.33 Wetted Perimeter 1.40 Area of Flow (ft2) 0.28 Hydraulic Radius 0.20 Velocity (ft/sec) 2.50 Flowrate (cfs) 0.70 Maximum Pipe Flowrate (gpm) 313 Peak Flow % of 75% Max Capacity 32.9% The sewer services have not been sized yet, but will likely be 4” and 6” depending upon the building fixture units. Services will be sized in accordance with the Uniform Plumbing Code. 11.13 Impact on Existing Wastewater Facilities The sewer flow contributions for the proposed development were determined using the City of Bozeman Design Standards. The proposed sanitary sewer main extensions that will serve the proposed development will connect to the existing 10” main in Kagy Boulevard and Willow Way, constructed during SUD Phase 2. During the development of Phase 2, it was determined that the 10” main has adequate capacity to serve future development along Willow Way, future development along Kagy Boulevard, and undeveloped property to the south of the project. Sewer Mains 6 6/23/2020 Sewer flows generated in Phase 3 of the SUD development will be collected in the ‘Farmer’s Canal Drainage Basin’ as identified by the City. The proposed new mains within the subdivision are 8” and 10” and connect to the recently-constructed 10” sewer main in Willow Way that continues north to the 15” main in Lincoln Street west through 19th Avenue eventually ending up in the 18” main in Garfield Street near the Bozeman Gateway Subdivision. Flows generated by the proposed Phase 3 development were combined with the estimated flows from currently undeveloped parcels, as well as existing developments (see Fig 3 in Appendix) to determine the impact of capacity within the downstream mains. Table 3 shows the combined flows of the Willow Way and Tai Lane subbasins, in addition to anticipated development of un-incorporated properties in the area, and evaluates the capacity within the adjacent sewer collection system. The combined peak flows that eventually end up in the 15” Lincoln Street main are estimated to be 886 gpm; this includes a 90 gpm peak for MSU home football games (established from monitoring), plus an additional 23 gpm for infiltration within the sewer drainage sub-basins. The anticipated peak flow of 886 gpm is under the capacity of a 15” main at minimum slope (0.21%) flowing 75% full (1,212 gpm). The approximate 850 LF of proposed sewer main extension within Kagy Blvd (extending west from the intersection of Willow Way) was conservatively sized as a 10” main flowing at only 48% Q/Q75, because an 8” main neared 75% capacity with estimated peak flows. Table 3: Capacity of Estimated Sewer Flows (in)(%)(gpd)(unitless)(gpm)(gpm)(gpm)(in)(gpm)(%) Lincoln 15 0.21%358,185 3.20 886 23 910 11.25 1,212 75% Willow 10 0.97%196,737 3.44 469 10 479 7.5 883 54% Kagy 10 0.28%99,571 3.67 254 10 264 7.5 475 56% Sewer Main Pipe Size Slope1 Avg Daily Flow Peaking Factor Peak Flow Infiltration2 Peak Flow + Infiltration Depth of Flow 75% Depth Capacity Flowrate Capacity Q/Q₇₅ 1 Slopes either proposed or as-built 2 150 gal/ac/day from COB Design Standards Table 3 is a summarization of a detailed analysis into the sub-basins in the vicinity of the project that contribute to the overall Mandeville Drainage Basin in the City of Bozeman’s sewer collection network. See Table 4 and the sewer capacity analysis map (Figure 4) included in the appendix for additional information. Sewer Mains 7 6/23/2020 11.14 Project Description Site development for this subdivision phase is anticipated to be a commercial emphasis according to the Master Plan on a 10.5-acre site. The project falls within the Master Planned SUD Residential Emphasis Mixed Use (REMU) zoning district. 11.15 Drawings Please see Figure 2, the Sewer Site Plan, included in the appendix, showing the proposed locations of the subdivision sewer mains. Plan and profile drawings will be submitted with future infrastructure design submittals. 11.16 Design Criteria The South University District Phase 3 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. 11.17 Site Information The SUD Phase 3 site is typical of Bozeman with fine grained soils overlying gravel deposits. Geotechnical borings have determined the depth to gravel ranges from 7 to 8 feet. Estimated depth to groundwater from the geotechnical borings is 4 to 8 feet. If mains are installed during periods of high groundwater, dewatering may be required. 11.18 Alternative Selection/ Analysis Due to the project’s location within the City of Bozeman, extension of public mains was the only sewer collection alternative. 11.19 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. Sewer Mains 8 6/23/2020 Table 4: Sewer Flows and Infiltration by Basin/Sub-basin (sf) (ac) (gal/ac/day)(gpd) (gpd) (ac) (gpm) 1 R4 Mandeville 90,036 2.1 1950 4,031 2 R1 Mandeville 88,716 2.0 730 1,487 3 RS Mandeville 65,449 1.5 1220 1,833 4 R2 Mandeville 181,359 4.2 980 4,080 5 County A Mandeville 834,350 19.2 730 13,982 6 County B Tai Lane 992,386 22.8 1456 33,171 7 B1 Tai Lane 460,873 10.6 1000 10,580 8 R4 Tai Lane 463,928 10.7 1950 20,768 9 RO Tai Lane 676,957 15.5 980 15,230 10 MSU Stadium Tai Lane 799,299 18.3 500 9,175 11 SUD PH 1B Tai Lane 252,977 5.8 2246 13,043 12 SUD PH 1 Tai Lane 557,933 12.8 2660 34,069 13 REMU Willow Way 625,319 14.4 1456 20,901 14 R4 Willow Way 225,119 5.2 1950 10,078 15 SUD PH 2 Willow Way 843,741 19.4 3073 59,520 16 SUD PH 3 - Block 1 Willow Way 458,500 10.5 4 30,947 17 SUD PH 3 - Block 2 Willow Way 495,062 11.4 1456 16,548 18 SUD PH 3 - Block 3 Willow Way 932,671 21.4 1456 31,175 19 SUD PH 3 - Block 4 Willow Way 615,844 14.1 1950 27,569 Totals 221.78 23.10 DescriptionMap # Designation1 Sub Basin 25,413 28.92 Average Daily Water Usage Rates2Area Subbasin Subtotal Subbasin Area Infiltration3 358,185 136,035 96.52 10.05 196,737 96.33 10.03 3.01 1 Numbers Correlate with Figure 3 2 Average Daily Water Usage Rates taken from Table 1-V, City of Bozeman Design Standards and Specifications Policy 3 Infiltration calculated at 150 gal/ac/day per City of Bozeman Design Standards and Specifications Policy 4 See Average Daily Water Usage Calculation in Table 1