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Home My WebLink AboutAppendix 6 - Water Main Extension Engineer's ReportR Cannery District Planned Unit Development Preliminary PUD Application Cannery District Partners, llc Appendix 6 Water Main Extension Engineer’s Report Water Main Extension Engineer’s Report Cannery District PUD February, 2015 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 Water Mains 1 2/5/2015 Engineer’s Report Contents Note: The Engineer’s Report format for the Cannery District PUD Water Main Extension follows DEQ-1 organization. Additional information required by the City of Bozeman Design Standards is added where required. Report Narrative 1.1.1 General information 1.1.2 Extent of water works system 1.1.3 Alternate plans 1.1.4 Site conditions 1.1.5 Water use data 1.1.6 Flow requirements 1.1.7 Sewage system available 1.1.8 Sources of water supply 1.1.9 Proposed treatment processes 1.1.10 Waste disposal 1.1.11 Automation 1.1.12 Project Sites 1.1.13 Financing 1.1.14 Future Extensions Figures and Tables Figure 1. Vicinity Map Figure 2. Water Site Plan (C2.0 - included separately) Table 1. Estimated Water Use Appendices A WaterCAD Hydraulic Analysis Water Mains 2 2/5/2015 1.1.1 General Information 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 3.30 acres within the City and 8.94 acres in the county. The development consists of four phases. The first phase, which was approved by the City of Bozeman and MDEQ in November of 2014, consists of remodeling four existing buildings originally constructed as part of the original pea canning operation in 1917. Though not required by the redevelopment of the existing buildings, the existing water and sewer infrastructure will be replaced and upgraded to current City standards, prior to the construction of proposed Phase 1 site improvements. A deferred annexation has been approved by the City of Bozeman for the eventual annexation of Phase 1. Phases 2, 3 and 4 involve the construction of six new buildings on the Cannery District property. Water demands from these future phases were accounted for in the design of the approved Phase 1 system. These future phases will be annexed prior to development, in order to receive municipal services for new buildings. The developer’s contact information is: Cannery District Partners, LLC 1006 W Main Street Bozeman, MT 59715 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 Cannery District is shown on the Vicinity Map in Figure 1. See C2.0 for Phase 1 through 4 improvements. Water Mains 3 2/5/2015 Figure 1. Vicinity Map, Bozeman, Montana 1.1.2 Extent of Water Works System Water supply to the area is from a 12” water main in Oak Street and Montana Avenue. The water main predates the current Oak Street alignment and follows older rights-of-way. As part of the overall development plan this water main will remain, and the existing on-site rights-of-ways will be replaced with 30’ water and sewer easements. The location of existing and proposed mains is shown on the Water System Site Plan, C2.0, included separately. The existing water system consists of a loop around the existing buildings constructed in 1917 to supply several fire sprinkler risers on the site. This system was originally supplied from Rouse Avenue, and included the landmark elevated storage tank. With improved City supply, the tank was no longer required, and has been removed from the system. With the development of the Northside PUD the original supply line from Rouse was replaced with a new 8” fire service and single 2” water service from the 12” main on-site. The 8” fire service is connected to the original loop around the buildings which is currently only used for fire protection water supply. The 2” water service is metered in a vault at the connection to the main and then splits to provide service to each building. The approved Phase 1 improvements include new 8” water mains that will replace the existing, old water mains on-site. The new mains will essentially follow the same route as the existing loop around the buildings. However, the new mains allow installation of new on-site fire hydrants, and new individual fire and water services to each building. The new water services are proposed to be metered in the buildings. The new 8” Water Mains 4 2/5/2015 water main loop allows for future extensions or services to serve future phases. Stubs for future water main extensions or services will be extended beneath Phase 1 site improvements. Future main extensions are shown on the Water System Site Plan. 1.1.3 Alternate Plans Due to the project’s location within the City of Bozeman, extension of public mains was the only water supply alternative. 1.1.4. Site Conditions The site is typical of Bozeman with 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. 1.1.5. Water Use Data The water use estimate for 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. For the Northside PUD and the portion of the Cannery District that is currently within city limits, the zoning designation is B-2. The rest of the Cannery district currently outside of city limits must be annexed prior to development, with the plan being to maintain the same zoning designation of B-2. Table V-1 shows a flow rate of 2000 Gal./Acre/Day for zoning designation B-2. This water use estimate using this flow rate is shown in Table 1 as the design rate. In order to determine average annual water use, 3 years of water meter readings from the adjacent and very similar Northside PUD were analyzed. This analysis showed an average annual water use rate of 1059 gpd/acre, which is applied to the Cannery District to determine its estimated average annual water use. Water Mains 5 2/5/2015 Table 1 Estimated Water Use - Cannery District PUD All existing and proposed buildings will have fire sprinklers. With this provision and the size of the buildings, required fire flows will likely be 1500 gpm. Existing irrigation to Phase 1 is provided by a well. It is envisioned that future irrigation to Phases 2-4 will continue to be handled in the same manner. The estimated total area of landscape irrigation is approximately 1.5 acres, within the exempt well water right limits. 1.1.6. Flow Requirements A hydraulic analysis was performed using WaterCAD. The WaterCAD model incorporates the 12” diameter city water main as the primary supply. Operating conditions and available fire flow in these mains was obtained from the WaterCAD model results provided in the City of Bozeman Water Facility Plan and hydrant flow data performed at a hydrant directly south of Phase 1 Cannery District. The fire flow analysis was conducted at the maximum day demand. The model is setup with existing and new pipes. Phase 1 pipes and junctions begin with numbers >100 (the Phase 2 pipe is labeled 201, and Phase 3 pipe numbers are labeled >300). Junction elevations are based on the project datum, approximately 15’ above the City of Bozeman datum. In order to determine fire flows at hydrants, hydrant lead pipes are provided to junctions representing hydrants. Hydrant lead pipes have minor losses corresponding to hydrant barrel and nozzle losses. Fire flows are determined at hydrant residual pressures of 20 psi. Fire flows determined at non-hydrant junctions are of little practical value since without hydrant losses computed fire flows are artificially high. Cannery District Water Use Phase 1 Phase 2 Phase 3 Phase 4 Total All Phases Acreage (acres) 3.761 3.29 3.237 1.946 12.234 Design Water Use Rate (gpd/acre) 2000 2000 2000 2000 2000 Design Daily Water Use (gpd) 7522 6580 6474 3892 24468 Design Peaking Factor (Ave Day to Peak Hour) 10 10 10 10 10 Design Peak Hour Flow (gpm) 52 46 45 27 170 Annual Average Water Use Rate (gpd/acre) 1059 1059 1059 1059 1059 Annual Average Daily Water Use (gpd) 3982 3484 3428 2061 12954 Annual Average Water Use (acre feet) 4.46 3.90 3.84 2.31 14.51 Water Mains 6 2/5/2015 A Hydrant flow test was conducted at the hydrant south of Phase 1. The city water supply was modeled as a reservoir-pump system calibrated to the hydrant test. The pump curve provides decreasing pressures with increasing flows corresponding to head losses in the distribution system outside of the model. The model results with only existing pipes utilized correspond well with the flows and residual pressures measured during the hydrant test. The WaterCAD model results are included in Appendix A of this report. Due to the high pressure in the water system at this location, available fire flow is not limited by residual pressure. The maximum permissible velocity of 15 fps in the 8” ductile iron water mains limits the fire flow available to 2530 gpm, which exceeds the required fire flow. The model shows the proposed water main improvements are capable of providing the required fire flow plus maximum day demand for the project. The proposed layout of the water system has each building with its own water and fire service, as shown in C2.0. Final determination of water service sizes will be based on fixture counts for each building. 1.1.7. Sewage System Available Sewer service is provided by city mains that will be replaced as part of the approved Phase 1 improvements. Where water mains cross sewer mains, 18” of vertical separation is provided. 1.1.8. Sources of Water Supply This section is not applicable. 1.1.9 Proposed Treatment Process This section is not applicable. 1.1.10 Waste Disposal This section is not applicable. 1.1.11 Automation This section is not applicable. 1.1.12 Project Sites Water Mains 7 2/5/2015 This section is not applicable. 1.1.13 Financing This section is not applicable. 1.1.14 Future Extensions The replacement of the water main loop that will be constructed during the approved Phase 1 improvements will allow future extensions and services to serve future phases. Stubs for future water main extensions or services will be extended beneath Phase 1 site improvements. Future main extensions are shown on the Water System Site Plan. During Phase 2 (Buildings J and K) the existing 12” main will be connected to the existing 8” main in Northside PUD. Additionally, new services and a hydrant will be installed on the existing 12” main. Phase 3 (Buildings L and M) will require a future main extension of the 8” water main as depicted by the dashed blue line in C2.0. A stub for this extension is provided with the Phase 1 water mains. Phase 4 (Buildings N and O) will utilize services from water mains installed in Phase 1. Figure 2 Water Site Plan Appendix A WaterCAD Modeling FlexTable: Pipe Table Current Time: 0.000 hours Length (User Defined) (ft) Velocity (ft/s) Flow (gpm) Minor Loss Coefficient (Local) Hazen-Williams C Diameter (in) Stop NodeStart NodeLength (Scaled) (ft) Label 10.56-2120.000130.012.4R-1PMP-114P-0 10.56-2120.000130.012.4PMP-1J-116P-1 10.291090.000130.012.4J-2J-1642P-2 00.20740.000130.012.4J-3J-2351P-3 00.20740.000130.012.4J-4J-3311P-4 00.18670.000130.012.4J-5J-425P-5 00.18670.000130.012.4J-6J-5191P-6 00.27-1030.000130.012.4J-7J-698P-7 0(N/A)(N/A)0.000130.08.3J-8J-741P-8 0(N/A)(N/A)2.700130.06.2HJ-9J-84P-9 00.13340.000130.010.3J-10J-2270P-10 00.20340.000130.08.3J-11J-10304P-11 00.27-1030.000130.012.4J-12J-7361P-12 10.27-1030.000130.012.4J-1J-12523P-13 01.011700.000130.08.3J-100J-6120P-100 01.011700.000130.08.3J-101J-10027P-101 00.44750.000130.08.3J-102J-101202P-102 00.18300.000130.08.3J-103J-10265P-103 00.18300.000130.08.3J-104J-103361P-104 00.29-490.000130.08.3J-105J-104123P-105 00.29-490.000130.08.3J-101J-105493P-106 00.16270.000130.08.3J-107J-104124P-107 00.0002.700130.06.2HJ-108J-10711P-108 00.0002.700130.06.2HJ-109J-10313P-109 00.0002.700130.06.2HJ-110J-10514P-110 00.0002.700130.06.2HJ-111J-10024P-111 00.05-80.000130.08.3J-4J-1148P-201 00.27450.000130.08.3J-301J-102289P-301 00.0002.700130.06.2HJ-302J-30111P-302 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 11/12/2014 Bentley WaterCAD V8i (SELECTseries 4) [08.11.04.50]Bentley Systems, Inc. Haestad Methods Solution CenterCDi WATERCAD.wtg FlexTable: Junction Table Current Time: 0.000 hours Pressure (psi) Hydraulic Grade (ft) Demand (gpm) Elevation (ft) Label (N/A)(N/A)(N/A)4,752.00HJ-9 1575,111.4504,748.00HJ-108 1565,111.4604,750.00HJ-109 1565,111.4604,751.00HJ-110 1565,111.5004,750.00HJ-111 1565,111.4504,751.00HJ-302 1545,111.5904,756.00J-1 1545,111.5904,756.00J-2 1545,111.5804,756.00J-3 1545,111.5704,755.00J-4 1555,111.5704,754.00J-5 1565,111.5704,752.00J-6 1565,111.5704,752.00J-7 (N/A)(N/A)(N/A)4,752.00J-8 1545,111.5804,755.00J-10 1545,111.57424,755.00J-11 1545,111.5904,756.00J-12 1565,111.5004,750.00J-100 1565,111.49464,750.00J-101 1565,111.4604,750.00J-102 1565,111.4604,750.00J-103 1575,111.45524,749.00J-104 1565,111.4604,751.00J-105 1575,111.45274,748.00J-107 1565,111.45454,751.00J-301 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 11/12/2014 Bentley WaterCAD V8i (SELECTseries 4) [08.11.04.50] Bentley Systems, Inc. Haestad Methods Solution CenterCDi WATERCAD.wtg Fire Flow Node FlexTable: Fire Flow Report Current Time: 0.000 hours Junction w/ Minimum Pressure (System) Pressure (Calculated System Lower Limit) (psi) Junction w/ Minimum Pressure (Zone) Pressure (Calculated Residual) (psi) Fire Flow (Available) (gpm) Label (N/A)(N/A)(N/A)(N/A)(N/A)HJ-9 J-10793J-107355,000HJ-108 J-103114J-103565,000HJ-109 J-105108J-105505,000HJ-110 HJ-302135HJ-302715,000HJ-111 J-30178J-301215,000HJ-302 J-3152J-31525,000J-1 J-3152J-31525,000J-2 J-4151J-41495,000J-3 J-11150J-111505,000J-4 J-4150J-41505,000J-5 J-4150J-41515,000J-6 J-4151J-41515,000J-7 (N/A)(N/A)(N/A)(N/A)(N/A)J-8 J-11151J-111465,000J-10 J-4150J-41475,000J-11 J-3152J-31525,000J-12 HJ-302135HJ-3021355,000J-100 HJ-302131HJ-3021315,000J-101 HJ-302116HJ-3021175,000J-102 HJ-109114HJ-1091145,000J-103 J-107109J-1071085,000J-104 HJ-110108HJ-1101085,000J-105 HJ-10893HJ-108935,000J-107 HJ-30278HJ-302785,000J-301 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 11/12/2014 Bentley WaterCAD V8i (SELECTseries 4) [08.11.04.50] Bentley Systems, Inc. Haestad Methods Solution CenterCDi WATERCAD.wtg