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HomeMy WebLinkAbout16 - Design Report - West Winds Ph 7 & 8 - Sanitary Sewer Sanitary Sewer Investigation for West Winds Planned Community Phase 7&8 Prepared For: Mahar Montana 13447 Hwy 238 Jacksonville, OR 97350 Prepared By: D0WL 2090 Stadium Drive Bozeman,MT 59715 CU,' r3' J A L A��COO April 2016 4522.1 l 728.01 Sanitary Sewer Investigation for West Winds Planned Community Phase 7&8 Prepared For: Mahar Montana 13447 Hwy 238 Jacksonville, OR 97350 Prepared By: BOWL 2090 Stadium Drive Bozeman, MT 59715 April 2016 4522.11728.01 Table of Contents Page Purpose.......................................................................................................................................1 Preliminary Conditions Summary................................................................................................1 Basisof Calculations...................................................................................................................1 ConveyanceFacilities .................................................................................................................1 Phase7&8...................................................................................................................................3 Conclusion..................................................................................................................................3 Figures Figure1 —Sanitary Sewer Plan....................................................................................................2 Appendices Appendix A—Hydraulic Calculations Appendix B —Proposed West Winds Phase 7&8 Sewer Improvements Appendix C—West Winds Phase 7&8 Preliminary Plats Page i BOWL West Winds—Phase 7&8 —Sanitary Sewer Investigation April 2016 Purpose This engineer's report is intended to address the sanitary sewer extensions for Phase 7&8 of the West Winds Planned Community. This report will determine the recommended sizing of the internal sanitary sewer system and the impact on the outlying sewer trunk lines. This report was prepared in accordance with the design criteria set forth in the City of Bozeman's Design Standards and Specifications Policy and the Montana Department of Environmental Quality Circular 2. Preliminary Conditions Summary The northwest corner of West Winds Subdivision will be served by the 24" diameter sanitary sewer main in Davis Lane. The Davis Lane main was extended into the West Winds Subdivision to service portions of Phase 5 and 6 and all of Phases 7 and 8 in 2009. The areas of the West Winds development that will be serviced by the Davis Lane sanitary sewer main are shaded orange in Figure 1. West Winds flow rate was based on a maximum total of 960 residential dwelling units and an average flow rate of 320 gallons per residential dwelling unit per day. The 320 gallon/residential dwelling unit/day figure is conservative. City design standards currently utilize 2.11 persons/dwelling unit and 89 gallons/day/person, and 150 gpd/acre for infiltration. West Winds has requested sanitary sewer service for 960 units; to date in West Winds Phases 1 through 6, 646 units have been platted as well as a 5-acre community center within Phase 5. Basis of Calculations The calculations and recommendations within this report are based on the regulations set forth in the City of Bozeman Design Standards and Specifications Policy and Montana Department of Environmental Quality Circular 2. Calculations are provided in Appendix A of this report. Conveyance Facilities An overview of the proposed sanitary sewer layout for Phase 7&8 of the West Winds Planned Community is shown in Figure 1. Eight inch diameter mains will serve Phase 7&8 of the subdivision and connect to an 8" diameter main extended into the northwest portion of the subdivision as a part of Phase 5 improvements from the intersection of Davis Lane and Baxter. Preliminary plan sheets showing proposed sanitary sewer improvements are included in Appendix B. Pagel of 3 DOWL ■111�li�11 / � �y � ■■■■■� • � I lom ONE ffla- IN we, vall al,Ile, AFFORDABLE Aw LIVIVG AREA ERM AMR ASSESMIlon AREA LEGEND WEST a • r 1111� �/ 111111 WINDS • , EX STING SEWER MANHOLE I SEWER LINE GALLATIN COUNTY •- mololi EXISTING SEWER MAIN ABANDONED INTANA 0 SEWER MANHOLE SANITARY PLAN ' E: West Winds—Phase 7&8 —Sanitary Sewer Investigation April 2016 Phase 7&8 Phase 7&8 of the West Winds PUD is a 21.4-acre subdivision with 60 single-family lots on 10.28 acres, 2.60 acres of open space, and 8.51 acres of paved streets. The Phase 7&8 Preliminary Plats are included in Appendix C. Wastewater flows in the West Winds Phase 7&8 Subdivision will be collected via eight inch mains into the 24" Davis Lane sewer main. There will be no flow from industrial plants, major institutions or corninercial facilities into the sewer collection system. Service Area—24"� Davis Lane Sewer Main The aforementioned extension from Davis Lane services 11 lots in the previously-platted Phase 5 subdivision, 42 lots within Phase 6 subdivision, and 60 lots within the Phase 7&8 subdivision. Sixty(60) single-family lots within Phase 7&8 will have sewer services connected to the service area that connects to the Davis Lane sewer main. Using the City of Bozeman standard of 2.11 persons per dwelling unit, and the City's design generation rate of 89 gallons per capita per day, the average flow rate was found to be 11,267.40 gpd. Applying the calculated peaking factor of 4.21,the estimated peak flow directly from Phase 7&8 was calculated to be 47,482 gpd or 0.073 cfs. Incorporating an infiltration rate of 150 gallons/acre/day into the peak flows over the 21.4- acres within the service area, and adding to the peak flow, a peak hourly now rate was calculated at 50,692 gpd or 0.078 cfs (see Appendix A for calculations). The sewer flows will be conveyed through 8" PVC sewer mains located along the centerline of the firture proposed street alignments;the mains generally flow north and west connecting into an existing 24"� main at the intersection of Davis Lane and Baxter Road. Taking into account flows from existing phases (5-6), the combined peak hourly flow from all phases is estimated to be 105,098 gpd or 0.163 cfs. This flow will require approximately 21.15% of the 8"main capacity, well under the allowed 75% flow limit. The same flows account for 1.61% of the capacity of the 24" main within Davis Lane. Table 1: West Winds Phase 7&8 Sanitary Sewer Demands Phase 7&8 Housing Designations Unit Count Persons/unit lPh 7&8 Population Gallons/Person/Day JTotal gal/day Single Family 60 2.11 126.6 89 11,267 Conclusion It is the finding of this report that the existing City of Bozeman sanitary sewer system has adequate capacity to service the Phase 7&8 Subdivision. We also assure that the proposed sanitary sewer main extensions will be designed and constructed in conformance with City of Bozeman and MDEQ standards. Page 3 of 3 DOWL z c R s F. f; �c,,7clvcoluflc "C'CoAcu'colu°dons BOWL West Winds Planned Community-Phase 7&8 Bozeman,MT PHASE 7&8 WASTEWATER FLOWS TO THE DAVIS LANE MAIN The following calculations are used to determine the mean sanitary sewer flow and required pipe diameter for the Phase 7&8 Subdivision of the West Winds Planned Community. Using Manning's Equation,the full flow capacity of the proposed 8"diameter ' PVC Sewer line is: am,=(1.486/n)-A-Rzo-S"` where: n= 0.013 for PVC Pipe A=PlY 0.35 ftz ' P=2'PI'r= 2.09 ft R=AIP= 0.17 ft S= 0.004 Qmn= 0.769 cis Calculate the peak hourly flow rate under developed conditions: Q„B 11,267 gpd (Table 1) Q„a 0.017 CIS Q,-= 47.482 gad O„y= 0.073 cfs (4.21 peaking factor) Calculate the peak hourly flow,with an Infiltration rate of 150 gallons/acrelday Area in Phase 7&8= 21.40 Acres Qi„s.= 3,210.00 gpd Q� Qvew*Qumi 50.691.94 gpd = 0.078 cfs Q Q—,we Q--ens*Q-t*Qmn Qmu 0.= 35,978.67 gpd (from W W Ph 6 SS Design Report) Q—°"s= 18,428 gpd (from WW Ph 5 SS Design Report) Q,,.,,= 105,098 gpd = 0.163 cfs Q—/Qmn= 0.21 = 21.15% Using the above parameters,velocity at the full flow in the 8"diameter pipe Is: v=(1.486/n)'R"Sta= 2.20 ft/sec Calculate peak flows and capacity of 24"Davis Lane Main. Ph 5 Q,,,=,= 18,428 Ph 6 Q_= 35,979 Ph 7&8 Q_= 50,692 Total 105,098 Including Phases 5 through 8 a-= 105.098 gpd = 0.163 cfs Q.—/Q., 0.21 = 21.15% Using Manning's Equation,the full flow capacity of the 24"Diameter Davis Lane Main PVC Sewer line is: Qmu=(1.486/n)'A'R"S"` where: n= 0.013 for PVC Pipe A=MY= 3.141593 ft' P=2'PI'r= 6.283185 ft R=A/P= 0.50 ft S= 0.002 Qmn= 10.117 cfs Qm/Qrmi= 0.02 1.61% \\BZN-FS\bzn-projacts\22\11728-01\500esign\Sewer\SanSewSizing-W W Ph7.xlsx (V N n co co E m cOo O m 00 c CD 1A M � O O O O O C Iq IDO N O • co co W n M N M A m r N co n r C CD m V CD N U u N T m co rn w ui o n m m co 0o n Q cD L v rn C7 rn m c-i � r- co v cu X m N Of _0 X C N (fl m n Y V (7 N N � L y LL a O co (O m W) 07 O Ch (0 Cl) (C V m m O n 00 r r C N N M oo cc) j >a cc N 3 C7 m co a C in D7 O Q) U cu N al m C y U 3 rn nm 0 >M O p 07 > 0 C i co ch O O N O 'a U n C m U N cc a N co m c. 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