HomeMy WebLinkAbout13 - Design Report - South University District Ph 1 & Stadium View Apartments - Water0nWater Main Extension Engineer's ReportSouth University District - Phase 1, andStadium View ApartmentsFebruary, 2013Submitted to:City of Bozeman Engineering Department20 East OliveBozeman, MT 59715Montana Department of Environmental QualityPermitting and Compliance DivisionPublic Water and Subdivisions BureauPO Box 200901Helena, MT 59620-0901Prepared by:Stahly Engineering and Associates7585 Shedhorn DriveBozeman, MT 59718(406) 522-9526^"^^yEST.STAHLY<^\J"0^^,
0nEngineer's ReportContentsNote: The Engineer's Report format for the South University District - Phase 1,and Stadium View Apartments Water Main Extension follows DEQ-1organization. Additional information required by the City of Bozeman DesignStandards is added where required.Report Narrative1.1.1 General information1.1.2 Extent of water works system1.1.3 Alternate plans1.1.4 Site conditions1.1.5 Water use data1.1.6 Flow requirements1.1.7 Sewage system available1.1.8 Sources of water supply1.1.9 Proposed treatment processes1.1.10 Waste disposal1.1.11 Automation1.1.12 Project Sites1.1.13 Financing1.1.14 Future ExtensionsFigures and TablesFigure 1. Vicinity MapFigure 2. Water System Layout (C2.0 - included separately)Table 1. Estimated Water UseTable 2. Building Fixture Counts and Service SizeAppendicesA Existing Hydrant Flow TestsB WaterCAD Hydraulic AnalysisWater Mains12/6/2014
nn1.1.1 General InformationThe South University District - Phase 1 subdivision is located within theCity of Bozeman adjacent to South 11th Street and south of KagyBoulevard. The subdivision is located west of Bobcat Stadium and issouth of the existing Stadium Center Subdivision. The subdivisionconsists of 3 lots, road right-of-way, and park. Lot 1 is a proposed 9.82acre site for the Stadium View Apartments, a 499-bed student housingfacility which is currently under review. Lots 2 and 3 are futuredevelopment tracts and are not proposed for development with thissubdivision.The developer's contact information is:Fountain Residential Partners2626 Cole Ave, Suite 620Dallas, TX 75204Water supply and wastewater treatment will be provided by the City ofBozeman's municipal systems. The system owner's contact informationis:City of Bozeman Public Service DepartmentPO Box 1230Bozeman,MT 59771-1230The location of the South University District - Phase 1 is shown on theVicinity Map in Figure 1 .Water Mains22/6/2014
»n0'7ff^^^ff-Mf1^yA^^s?K.^*••*»n^v:(.*.'^••-«41A;1t.>J<»A?1..4-t't1s"^•»y1-...fM.*•)-m\.<-^^'».''^s•^^^Sf-••IPHASE 1SUBDIVISION28.06 ACRES:^1 STADIUM VIEW! 9.82 ACRES'.y^i (HATCHED)'^•i*SOU7M UNIVERSHY DISTRICT126.9.3^CRE$IllFigure 1. Vicinity Map, Bozeman, Montana1.1.2 Extent of Water Works SystemWater supply to the area is from a 12" water main in Kagy coming westfrom the intersection of Kagy and South 19 Avenue, and from a 6" watermain coming from the east. Additional 8" and 12" water mains are loopedwithin the Stadium Center Subdivision, with an 8" water main ending at thesouth end ofArianna Way. A 12" water main extends south in South 11thAvenue along the South University District.The location of existing and proposed mains is shown on Figure 2,included separately. The South University District Phase 1 subdivision willextend water mains from Arianna Way and South 11 Avenue to Lot 1.An 8" main will be extended into Lot 1 from the center of the South 11thfrontage. A 12" water main will be extended in Campus Boulevard to theend of the right-of-way, with 8" stubs to the north and south. The 12" mainin Campus Boulevard will be extended west to serve future developmentphases.Water Mains32/6/2014
^r'As part of the development of Lot 1 8" water mains will be installedthrough the property to serve buildings and on-site fire hydrants from thestubs installed with the subdivision improvements. Water mains will alsobe stubbed at two locations into Lot 2 from Lot 1. The water mains on Lot1 will be located in public utility easements.The three connections proposed will supply water to the Stadium ViewApartments as well as provide for future expansion of the futuredevelopment lots. Eventual future phases of South University District willrequire more main extensions. Internal looped mains and additionalconnection to the 24" main in South 19 Avenue facilitates future mainextensions on the site.1.1.3 Alternate PlansDue to the project's location within the City of Bozeman, extension ofpublic mains was the only water supply alternative.1.1.4. Site ConditionsThe site is typical of Bozeman with fine grained soils overlying graveldeposits. Geotechnical borings have determined the depth to gravelranges from 7 to 10 feet. Estimated depth to groundwater obtained fromthe geotechnical borings is 6-13 feet. If mains are installed during highgroundwater times dewatering may be required.1.1.5. Water Use DataWater use estimates for South University District - Phase 1 are essentiallythe water use for the Stadium View Apartments proposed on Lot 1. Theestimated water use is presented in Table 1. The City of Bozeman wateruse was obtained from the Bozeman Water Facility Plan prepared byAllied Engineering in 2005. Present city water use varies from an averageday flow of approximately 5 MGD to summer maximum day flows of over10 MGD. Since irrigation is by well and not from the water system, theestimated water use was derived from the City of Bozeman designstandards for wastewater generation. This suggests an 89 gpd/capitaestimate for residential uses. For commercial (non-residential) useslocated along South 11th, water use estimates were from determined citydesign standards for wastewater flow allocations based on land use andgross lot area, and DEQ recommended values. The City of Bozemanpeaking factors of 2.3:1 (maximum day to average day) and 3:1(maximum hour to average day) are used to provide maximum day andmaximum hour flows. Estimated water use is shown in Table 2.Water Mains42/6/2014
nTABLE 1 Estimated Water Use-South University District - Phase 1Total Site Area (acres)9.82Student Housing Residents499per capita use (gpd)89Student h^ousing Use (gpd)44,411Non-residential Employees4per capita flow (gpd)15Non-residential Employee Flow (gpd)601800 SF Commercial Shell1Estimated Flow (gpd/unit)400Phase 1 Commercial Flow (gpd)400Total Daily Flow (gpd)44,871Total Daily Flow (gpm)31.2Max Day Flow (2.3 peaking factor) (gpm)71.7Max Hour Flow (3.0 peaking factor) (gpm)93.5Fire flow requirements are based on the Uniform Fire Code. The requiredhydrant flow is determined using Table H.5.1 of the Uniform Fire Code. A48,000 sq ft Type V-A building requires a fire flow of 4000 gpm. The firedepartment is allowing a 75% reduction due to the fire sprinkler system,reducing the hydrant flow down to the minimum required fire flow of 1500gpm. The total fire flow available will allow for the use of the hydrant andthe sprinkler while maintaining the required 20 psi residual pressure.1.1.6. Flow RequirementsA hydraulic analysis was performed using WaterCAD. The WaterCADmodel incorporates the 12" diameter city water main in Kagy Boulevard asthe primary supply. The model assumes very little if any flow comes fromthe smaller 6" main in Kagy from the east. Operating conditions andavailable fire flow in these mains was obtained from the WaterCAD modelresults provided in the City of Bozeman Water Facility Plan and hydrantflow data performed at hydrants directly adjacent to the proposed site.The fire flow analysis was conducted at the maximum day demand.The model is setup with existing and new pipes. New subdivision pipesand junctions begin with numbers >100, and site pipes and junctions beginwith numbers >200, for ease of review. Junction elevations are based onthe project datum, approximately 15' above the City of Bozeman datum.In order to determine fire flows at hydrants, hydrant lead pipes areWater Mains52/6/2014
nr^provided to junctions representing hydrants. Hydrant lead pipes haveminor losses corresponding to hydrant barrel and nozzle losses. Fireflows are determined at hydrant residual pressures of 20 psi. Fire flowsdetermined at non-hydrant junctions are of little practical value sincewithout hydrant losses computed fire flows are artificially high.The city water supply was modeled as a reservoir-pump system calibratedto the Facility Plan model results. The pump curve provides decreasingpressures with increasing flows corresponding to head losses in thedistribution system outside of the model.Hydrant flow tests were conducted at the two hydrants adjacent to Phase1, one on the northern edge of the development at the south end of South12th Avenue and one at the northeast corner of the project on South 11Avenue. The model results with only existing pipes utilized correspondwell with the flows and residual pressures measured during the hydranttests.The WaterCAD model results are included in Appendix A of this report.The model shows that hydrants will have fire flow of approximately 3400gpm with system residual pressure of 20 psi. This is similar to the highflow test conducted by the City at hydrant 1147 which had a flow of 31 70gpm. Due to the addition of looped mains connecting this hydrant back tothe system, the fire flow available at this hydrant (J-10) increases. Themodel shows the proposed water main improvements are capable ofproviding the required fire flow plus maximum day demand for the project.Domestic water service sizes are based on fixture count analysis for eachbuilding. Table 2 shows the flow required for each building service basedon fixture counts.TABLE 2 Building Fixture Counts and Service SizeBuilding #Fixture Counts(fixture units)Peak Flow(9pm)Size of ServiceBuilding 1275802"Building 2275802"Building 35201284" (3" meter)Building 45201284" (3" meter)Building 5225702"Building 6225702"Building 7225702"Building 8225702"Maintenance20201"Outdoor Ammen. I 20201"Water Mains62/6/2014
nr\The flow rate required for buildings 3 and 4 exceeds the maximumallowable flow in a 2" service line. If available, a 3" service would workwith allowable velocities and headloss. Due to the Water Department'spolicy on 3" services, a 4" service line with a 3" meter is proposed forthese services.4" fire ser/ice lines will be provided to Buildings 1 through 8. A 4" fireservice can provide sprinkler flows of up to 587 gpm at velocities less than15 ft/sec in the service line.1.1.7. Sewage System AvailableSewer service is provided by city mains. South University District - Phase1 will connect to existing sewer mains currently extended to the south endof South 12th Avenue. Where water mains cross sewer mains 18" ofvertical separation is provided.1.1.8. Sources of Water SupplyThis section is not applicable.1.1.9 Proposed Treatment ProcessThis section is not applicable.1.1.10 Waste DisposalThis section is not applicable.1.1.11 AutomationThis section is not applicable.1.1.12 Project SitesThis section is not applicable.1.1.13 FinancingThis section is not applicable.1.1.14 Future ExtensionsWater Mains72/6/2014
nr\Future connections to the south and west are anticipated from theproposed water main extensions. These future connections were takeninto consideration when sizing the southern water main located in CampusBlvd. This proposed 12-inch main will allow for future water mainextensions to be made to the south and west, and two 8-inch stubs areproposed for future development of Lot 2. As development moves to thewest, an additional connection to the existing main located in South 19thAvenue will be made which will provide additional capacity andredundancy to the future water system.Water Mains82/6/2014
n0WATER SYSTEM LAYOUT
\¥lilsa\.~/./^rt-—-]——--',vPROJECT BEIJICHMARKARROW BOLT ONHYDRANT ELi 49.35.33ST^DrUM-CENTERSUBDMSiON------CONNECTTO'WATER MAIN.EX HYDRANT-[^J„-!.1EX HYDRANT»HASE 1 BOUNDARY•s.STATE ST.^r%.c- 'F~iiS-BUILDING 333 UNITS/105BDRMS.BUILDING 512UNrrS/48BDRMS.BLDG712 UNITS/48 BDRMS.^-0s^,^^su0&>sft?ftft••s^Q^ESES!risrHiiN!UmlliNUJIil!lui5t^?~./CQ•s-—4&46-——'"STUB FOR FUTUREMAIN EXTENSIONCT>I*t<^p8"Nj-WAtE^'ONE ni i I I ; -I |{..^^ffiFII I-! IGSSPACKi^>-85 SPACES3)/$a•nD10FUTURE PHASE LOTcoPHASE 1 LOT9.82ac.>&ttLU~a0)CON^CtTO<IEXWlfNG'-,WATEItflI•«Q-UJuui|NUU.R1/;.><ill!a>?yI><•tI85 SPACES105 SPACESSTUB FOR FUTUREMAIN EXTENSIONPHASEPARK1rsiB"a".^sStORMWATERDETENTION-'<vron3s,LEp3§BUILDING WATER ANDFIRE SERVICE LINES (TYP)aBCQ usEXi£aHYinsa {sBLDG8BUILDING 433 UNITS/105BDRMS.BUILDING 612 UNITS /48 BDRMS.12 UNFTS /48 BDRMS.^kffCAMPUSBLVD.CQNNECr 70'EXIS-PNdWATCR MAIN(STUCKY ROAD)STUB TOR FUTURMAIN EXTENSION-—/-FUTU RE PHASE LOT ^•'s^&(S)0 25 50100POOL :,No.l1i;4EPE;£3.? -11' ••^?s:<&fSCALE IN FEETSTAHLYIs5w 2W 0)< ®Stl^u^^3^Sl^z S»oII^i°°iJ|IJ|lI'JII0w^sI", il^IriHI^ §??3sll!!lScmIsIIIsslilia.^n?.1il£Ei!^??r^•^1CM^5a.emIIIIIliUJa.0py^11! Isilltill^ilW (K COIESIGNED.IRAWNCDPCDPCDP:HECKED-,ATE 11/13/13SHEETC2.0
n0HYDRANT FLOW TEST RESULTS
n0CITYOFBOZEMANHYDRANT PRESSURE/FLOW REQUEST FORM^^.IOTE70T20*20Shaping Our Pu hire TtogetherDate: 1/18/12LocationHydrant # | Static Pressure | Pito Pressure | Residual PressureStadium Dr. /Alien Dr.114682#72#Arianna Way114734#Requested By: Ryan RittalFax #Nozzle Size Flowed: 4.5'Done By: ES/ JBComments: 3170 GPMa»=slKA(;V,ftl.VD656:;193 »AtiTl—frp^657j nRT1461147VI|1U8d^15148014811479,>275v|496I)•14824971919Q498^'499830
0nCITYOFBOZEMANHYDRANT PRESSURE/FLOW REQUEST FORM.^^.ozEmen2 0*20Shaping Our Fuhire TogetherDate: 1/18/12LocationHydrant # | Static Pressure | Pito Pressure | Residual PressureStadium Dr. /Alien Dr.114682#80#South 11 th114862#Requested By: Ryan RittalFax #Nozzle Size Flowed: 2.5'Done By: ES/ JBComments: 1320 GPM»>•s.><667IS275LVD656At?C3VL ^m>T.m14COf;-^?^'•U79A|4961146i14811481147t«14 B2497,t1919498499V.,, 830
0nWATERCAD MODELING
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0nFire Flow Node FlexTable: Fire Flow ReportCurrent Time: 0.000 hoursLabelFire Flow(Available)(gpm)Pressure(CalculatedResidual)(psi)Junction w/MinimumPressure (Zone)Pressure(CalculatedSystem LowerLimit)(Psi)Junction w/MinimumPressure(System)J-lJ-3J-4J-5J-6J-7J-9J-10J-llJ-12J-14J-15J-16J-17J-18J-19J-100J-101J-102J-103J-104J-105J-106J-107J-200J-201J-202J-203J-205J-206J-207J-209J-210J-211J-212J-213J-2143,9603,9113,9363,9063,9203,9153,8983,5193,9183,5523,8803,5063,8773,8573,8323,7753,8933,8593,4603,8343,3993,8403,8443,4483,8803,8653,4383,8633,8363,3973,8553,8263,3873,7993,8233,8483,41833.929.532.529.331.025.822.320.031.020.027.520.027.124.721.720.021.822.620.021.820.022.821.920.022.120.020.022.420.020.021.620.020.020.020.020.020.0J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-18J-19J-19J-19J-19J-19J-19J-19J-19J-19J-202J-19J-19J-206J-205J-19J-210J-209J-209J-211J-214J-21320.020.020.020.020.020.020.045.220.045.120.044.520.020.020.026.320.020.145.120.045.920.020.044.520.020.046.820.020.047.220.020.047.024.122.420.047.5J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-19J-18J-19J-19J-19J-19J-19J-19J-19J-19J-19J-202J-19J-19J-206J-205J-19J-210J-209J-209J-211J-214J-213J1358-00613 SUD 2 WATERCAD.wtg12/17/2013Bentley Systems, Inc. Haestad Methods SolutionCenter27 Siemon Company Drive Suite 200 WWatertown, CT 06795 USA +1-203-755-1666Bentley WaterCAD V8i (SELECTseries 4)[08.11.04.50]Page 1 of 1
nnFlexTable; Junction TableCurrent Time: 0.000 hoursLabelElevation(ft)Demand(gpm)Hydraulic Grade(ft)Pressure(psi)J-lJ-3J-4J-5J-6J-7J-9J-10J-llJ-12J-14J-15J-16J-17J-18J-19J-100J-101J-102J-103J-104J-105J-106J-107J-200J-201J-202J-203J-205J-2063-207J-209J-210J-2113-212J-213J-2144,922.004,928.004,925.004,932.004,928.004,931.004,933.004,933.004,928.004,928.004,936.004,936.004,937.004,943.004,950.004,954.004,934.004,943.004,943.004,949.004,949.004,942.004,942.004,942.004,936.004,938.004,938.004,941.004,942.004,942.004,940.004,941.004,941.004,943.004,939.004,938.004,938.0001002500250000000004000000000019001900190001905,118.205,118.145,118.175,118.145,118.155,118.155,118.145,118.145,118.155,118.155,118.145,118.145,118.135,118.135,118.135,118.125,118.145,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.135,118.1384.982.383.680.582.381.080.180.182.382.378.878.878.475.872.771.079.775.875.873.273.276.276.276.278.877.977.976.676.276.277.176.676.675.877.577.977.91358-00613 SUD 2 WATERCAD.wtg12/17/2013Bentley Systems, Inc. Haestad Methods SolutionCenter27 Siemon Company Drive Suite 200 WWatertown, CT 06795 USA +1-203-755-1666Bentley WaterCAD V8i (SELECTseries 4)[08.11.04.50]Page 1 of 1
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