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HomeMy WebLinkAboutDesignReportPart1_021121 Infrastructure Design Report Water, Sanitary Sewer & Storm Sewer) Gran Cielo Subdivision Lot 3, Block 5, Phase 1 Lot 5, Block 6, Phase 1 Lot 4, Block 12, Phase 1 Lot 9, Block 13, Phase 1 Located in the NE 1/4 of Section 23, T. 2S., R. 5E., P.M.M. City of Bozeman, Gallatin County, Montana Prepared By: •��� . \ ENGINEERING& LAND SURVEYING �a d\ •• tterman w 15873ES ! December, 2020 �/cENs�- CO FFR-LAN SANITARY SEWER Sanitary sewer service for the project will be provided by extending the existing 4" service stubs that were provided to the lots with the original subdivision infrastructure. Lot 3, Block 5 Phase 1 proposes one duplex unit and one triplex unit. Lot 5, Block 6, Phase 1 proposes two duplex units and a triplex unit. Lot 4, Block 12, Phase 1 proposes two triplex units. Lot 9, Block 13, Phase 1 proposes one duplex unit and two triplex units. This project proposes two duplex units and two four-plex units for a total of twelve residential units. The estimated average daily sewer flow for Gran Cielo, Phase 1 is calculated using typical wastewater flows from the City of Bozeman Design Standards Estimated Average Daily Sewer Flow Gran Cielo Phase 1: 95 dwelling units 2.11 persons/dwelling unit 89 gpdpc 29.48 Acres (95 dwelling units)(2.11 persons dwelling galcapitalons/daY) = 611.53 gallons/day/acre 29.48 Acres Assumed Infiltration = 150 gallons/day/acre Total Loading = 761.53 gallons/day/acre A copy of the Gran Cielo Sewer Main Design Report had been included in Appendix A with the applicable sections highlighted. Using the City of Bozeman Design Standards Gran Cielo, Phase 1 was designed to handle the R-3 zoning load of 1,220 gallons/day/acre plus the infiltration load of 150 gallons/day/acre for a total load of 1,370 gallons/day/acre. Using the actual density of the lots within Gran Cielo, Phase 1 the projected loading was calculated above to be 761.53 gallons/day/acre. The loading due to the actual density within Gran Cielo, Phase 1 is far less than what the system was designed to handle using the parameters set by R-3 zoning. WATER SYSTEM Water service for the project will be provided by extending the existing 1" and 1.5" service stubs that were provided to the lots with the original subdivision infrastructure. Water Service Calculation Worksheets for each proposed building type are included in Appendix B. The original Gran Cielo Subdivision Water Main Design Report is included in Appendix C with the applicable sections highlighted. The original water capacity analysis for Gran Cielo Subdivision was conducted assuming a density based on zoning. The R-3 portion of the property was designed assuming a density of 6.5 units/acre. Gran Cielo Subdivision, Phase 1 contains 95 dwelling units within its 29.48 acres resulting in an actual density of 3.22 units/acre. This density is far less than the original design parameters which demonstrates the system's capacity was designed to be far greater than the actual design load. STORM WATER MANAGEMENT The majority of the storm water runoff from this project will be conveyed via surface (sheet and channelized) flow to the permanent and temporary retention ponds for Gran Cielo Subdivision, Phase 1. Gran Cielo Subdivision Storm Water Design Report accounts for a storm water runoff coefficient of 0.35 on the residential lots under the assumption the zoning is low to medium density. The actual storm water runoff coefficients for each lot were tabulated in the Storm Water Design Calculations that are included in Appendix E. The site have a higher storm water runoff coefficient than the original subdivision design accounts for which results in a volume of water that must be captured on site. The volumes that are required to be stored on site are also tabulated in the Storm Water Design Calculations that are included in Appendix E. The site plan for each lot shows the grading and storm water facilities provided to ensure each site meets the City of Bozeman Specifications. Appendix A • Gran Cielo Subdivision Sanitary Sewer Design Report �� TrVn L NOV SEWER MAIN BY:______r__ DESIGN REPORT FOR: GRAN CIELO SUBDIVISION BOZEMAN, MT r� Prepared By: cc NEE: MADISON L ENGINEERING 1' Madison Engineering 895 Technology Blvd Ste 203 Bozeman, MT 59718 I (406) 586-0262 NOVEMBER 2018 ;�, 'o .r i vryL, \� J SEWER MAIN DESIGN REPORT FOR: GRAN CIELO SUBDIVISION BOZEMAN, MT ooTiffif JI Madison Engineering 895 Technology Blvd Ste 203 Bozeman, MT 59718 (406) 586-0262 NOVEMBER 2018 GRAN CIELO SUBDIVISION SEWER MAIN DESIGN REPORT A. General This report will give an overview of the proposed wastewater flow generation from the new development of the Gran Cielo Major Subdivision. The site is situated at the intersection of S. 27th Ave and Graf St in Bozeman. The 48.75-acre subdivision is zoned R-3 and R-4, and will consist of one-unit,two-unit,and multi-unit residences. The proposed improvements are anticipated to be phased, with the first phase being constructed during the fall of 2018. This report will provide a description of the proposed wastewater collection system and design parameters. Once the wastewater system is constructed and approved, the system will become a part of the City of Bozeman system. The following references were used in the wastewater facilities design and capacity analysis: a. COB Design Standards and Specifications Policy,2004,Addendum#6 b. COB Modifications to Montana Public Works Standard Specifications(MPWSS),Addendum#3 c. City adopted MPWSS and Adopted Addenda d. COB Wastewater Facility Plan,2015 e. WQB Circular No. 2 f. City of Bozeman Zoning Map g. City of Bozeman Infrastructure Viewer The procedures and parameters outlined in the COB Design Standards and Specifications Guide were used in the design of the sewer infrastructure for the proposed development. B. Capacity Analysis The proposed wastewater collection system consists of 6,466 linear feet (1.22 miles) of new sewer main and will provide service to Gran Cielo Subdivision and the 40.78-acre parcel of undeveloped land south of the subdivision, known as Tract A COS 1861. Effluent generated will ultimately flow north and east into an existing manhole on the east side of S. 27th Ave, and then into an existing 15" PVC sewer main. Sanitary sewer main stubs are provided at the southern limits of the project at S. 29th Ave and S. 31 st Ave to serve the future development of the 40.78- acre parcel south of Gran Cielo Subdivision. The-proposed sewer main has been sib to,fiow W-na tWff T of fall eapwity-P r hour conditions at full buildout. An infiltration rate of 150-gallons/acre/day was added to.the design flow. A Manning coefficienof 0,013 was used for PVC.pipe. The proposed subdivision totals 39.80 acres of R-3 zoned land and 8.95 of R-4 zoned land. Tract A COS 1861 is not currently within the City limits, but it was assumed that the parcel would become zoned R-4 when annexed into the City. The capacity requirement of the proposed sewer mains was determined based on the proposed buildout of the entire Gran Cielo Subdivision, plus the future full build out of the 40.78 acres to the south. The?City of Bozeman's Design Standardsr ..specify an average daily flow rate of 1,220- gal/acre/day for R-3 deveiopmanV and` 1,9 ) Gran Cielo Subdivision Sewer Main Design Report Page 1 of 4 gal/acre/day for R-4 development, as obtained from Table V-1, and 89-gallons per capita per day. The sanitary sewer system is broken into three drainage basins, as outlined in the Drainage Basin Exhibit in the Appendix. Basin 1 and 2 flow into the existing manhole at 27th and Bennett Boulevard while Basin 3 flows into the existing manhole at Apex Drive. Table 1 shows the estimated wastewater demands of each drainage basin at full build out. Peaking factors were calculated based on the following formula: Qmax i Qavo=(1&+P°-5)/(4+PO-5) (P=Population/thousands) The calculated peaking factors are included in the appendix of this report. The peak flow rate anticipated from the development was calculated by multiplying the average flow rate by the peaking factor. The peak flow rate was then converted from gpd to cfs. Table 1 Peak Flow Rates Wastewater-- Area Average Flow Peaking Peak Flow Peak Drainage Basin Zoning Loading Served Rate(gpcl� Factor Rate(gpd) Flow _ _ ( d/acre) (acres) Rate(cfs) Gran Cielo R-3 1,220 29.48. 35,966 • -- -- -- Phase 1 _ - ------- 1 Tract A COS R-4 1,950 40.78 79,521 -- -- -- 1861 -- Total -- -- 70.26 115,487.;J. 3.72 429,612" .3 0.6-65 2 Gran Cielo� R-3 1,220 19.59 23,900 4.10 97,990 0.152 Future Phase 3 Gran Cielo T R_4 1,950 8.95 17,453 4.15 72,430 0.112 Future Phase Infiltration calculations are provided in Table 2, and added to the peak flow to determine the total flow capacity required. Table 2 Infiltration Rates Area Infiltration Infiltration Infiltration Max Peak Flow: Capacity Drainage Served Rate Infiltration+ Provided (cfs) Basin Rate (gpd) Rate(cfs) Peak Flow-(cfs)-- _ _ acres (gpd/acre) 1 70.26 150 I0,539 0.016 0.691 30 T• 1.1 S(Basin 1) 2 19.59 150 2,939 0.005 0.157 0.70 (Basin 21 1.26 (Basin 1+2) 3 8.95 150 1,343 0.002 0.114 0.70 (Basin 3) --- -- 7�.l 0 ,3 c fJ Gran Cielo Subdivision Sewer Main Design Report Page 2 of 4 An 8-inch PVC sewer main at minimum slope of 0.4%and a Manning Coefficient of 0.013 has a capacity of 0.70 cfs at 75% of full flow capacity. This is sufficient accommodate the peak flows for Drainag Basin I (0:691 cfs), Drainage Basin 2 (0.157 cfs), and Drainage Basin 3 (0.114 cfs). In order to be conservative for Drainage Basin 1, a design slope of 1.30% was used at the location of maximum peak capacity. At 75% full flow capacity, an 8-inch PVC at 1.30% slope and a Manning Coefficient of 0.013 can accommodate 1.15 cfs. This is sufficient capacity to accommodate the wastewater demand of 0.681 cfs from Drainage Basin 1. Drainage Basins 1 and 2 ultimately combine into a 10-inch PVC, which can accommodate 1.26 cfs at a slope of 0.40% and Manning Coefficient of 0.013. This is enough capacity to accommodate the combined wastewater demand of 0.84 cfs, from Drainage Basins 1 and 2. The sewer main capacity calculations are provided in the appendix of this report. C. Proposed Collection System PVC pipe meeting COB specifications will be used for all the sewer mains. All sewer mains proposed as part of this project will be 8-inch diameter with a maximum manhole spacing 400 feet and a minimum manhole barrel-size of 48-inches. Manholes will be constructed according to COB specifications. Sewer services will be stubbed to each individual lot and will be a minimum of 4-inch diameter. A site plan showing the proposed sewer mains is included in this submittal. All sewer mains will be located within a 30-foot wide utility easement and be located a minimum of 10-feet from the proposed public water main. D. Upstream and Downstream Capacity Analysis The system is part of the Cattail Creek Drainage Basin. It is anticipated that the City of Bozeman sanitary sewer system has enough capacity to accommodate the main extension. It was assumed that the 40.78-acre lot to the south of Gran Cielo Subdivision (Tract A COS No. 1861) would reasonably be served by the proposed main in Gran Cielo Subdivision. This was accounted for in the design, and shown in the Sanitary Sewer Drainage Basins Exhibit provided in the appendix. Based on the City of Bozeman Wastewater Improvement Plan, it is not anticipated that any other areas will be served by the mains in Gran Cielo Subdivision. A contour area map is provided in the appendix. The contours show that the 40-acre lot to the west of Gran Cielo Subdivision is graded such that wastewater will flow into Fowler Ln. The contour area map was obtained from the City of Bozeman Infrastructure viewer. E. Conclusion As outlined above, the proposed 8-inch and 10-inch sanitary sewer mains have the capacity for the effluent generated by the proposed Gran Cielo Subdivision and COS No 1861. This project will require the approval of the City Engineer and MDEQ. Gran Cielo Subdivision Sewer Main Design Report Page 3 of 4 Appendix 1. Sewer Main Capacity Calculations 2. Peaking Factor Calculations 3. Drainage Basin Exhibit 4. City of Bozeman Wastewater Improvement Plan 5. Area Contour Map Gran Cielo Subdivision Sewer Main Design Report Page 4of4 E. Conclusion As outlined above, the proposed 8-inch and 10-inch sanitary sewer mains have the capacity for the effluent generated by the proposed Gran Cielo Subdivision and COS No 1861. This project will require the approval of the City Engineer and MDEQ. Appendix 1. Sewer Main Capacity Calculations 2. Peaking Factor Calculations 3. Drainage Basin Exhibit 4. City of Bozeman Wastewater Improvement Plan 5. Area Contour Map Gran Cielo Subdivision Sewer Main Design Report Page 4 of 4 10-Inch PVC Pike Capacity Project Description Friction Method Manning Formula Solve For Discharge Input Data Roughness Coefficient 0.013 Channel Slope 0.40 % Normal Depth 7.5 In Diameter 10.0 in Results Discharge 1.26 ft'/S �. o Flow Area 0.44 ft= Wetted Perimeter 1.75 ft Hydraulic Radius 3.0 in Top Width 0.72 ft Critical Depth 0.50 ft Percent Full j 75.0 Critical Slope 0.00728 ft/ft Velocity 2.88 ft is Velocity Head 0,13 ft Specific Energy 0.75 ft Froude Number 0.65 Maximum Discharge 1,49 ft'/s Discharge Full 1-39 ft'/s Slope Full 0.00333 ft/ft Flow Type SubCritical GVF Input Data Downstream Depth 0,0 In Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0-00 % Normal Depth Over Rise 75.00 % Downstream Velocity Infinity fUs Bentley Systems,Inc. Haestad Methods SolkabirtiAplttewMaster V81(SELECTseries 1) [08.11.01.031 7/1612018 11:31:24 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 1 of 2 ..__..10-Inch PVC PiQe Capacity_........ GVF'Output Data Upstream Velocity Infinity ft/s Normal Depth 7.5 in Critical Depth 0.50 ft Channel Slope 0.40 % Critical Slope 0.00728 ft/ft Bentley Systems,Inc. Haested Methods Soldli mtiWtewMaater V61(SELECTseries 1) [08.11.01.031 7/1612018 11:31:24 PM 27 Siemons Company Drive Suite 200 W Watertown,CT 06795 USA +1.203.756.1666 Page 2 of 2 8-Inch PVC Pipe CaPOCi Friction Method Manning Formula Solve For Discharge Input Data Roughness Coefficient 0.013 Channel Slope 1.300% Normal Depth 5.6 In Diameter 8.0 in Results Discharge 1.15 ft'/s Flow Area 0.26 ft- Wetted Perimeter 1.32 ft Hydraulic Radius 2.4 In Top Width 0.61 ft Critical Depth 0.51 ft Percent Full 70.0 % Critical Slope 0.01051 ft/ft Velocity 4.42 ft/s Velocity Head 0.30 ft Specific Energy 0.77 ft Froude Number 1.19 Maximum Discharge 1.48 ft3/s Discharge Full 1.38 ft'/s Slope Full 0.00911 ft/ft Flow Type SuperCritical GVF•Input,Data Downstream Depth 0.0 in Length 0.00 ft Number Of Steps 0 GVF WpUt Data Upstream Depth 0.0 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 % Normal Depth Over Rise 70.00 % Downstream Velocity Infinity ft/s Bentley Systems,Inc. Haestad Methods Sol irdantISpIfteevMaster Val(SELECTserles 1) 108.11.01.031 7/16/2018 11:43:35 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06796 USA +1-203-765-1666 Page 1 of 2 8-Inch PVC Pipe Capacity Upstream Velocity Infinity ft/s Normal Depth 5.6 in Critical Depth 0.51 ft Channel Slope 1.30000 % Critical Slope 0.01051 fUft Bentley Systems,Inc. Haestad Methods Soidtw ephiewMaster V81(SELECTserles 1) [00.11.01.031 71IM2018 11:43:35 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 2 of 2 8-inch PVC Pipe-Capaci Project Description Friction Method Manning Formula Solve For Discharge Input Data Roughness Coefficient 0.013 Channel Slope 0.40 % Normal Depth 6 in Diameter 8 in Results Discharge 0.70 tl'/s Flow Area 0.28 W Wetted Perimeter 1.40 ft Hydraulic Radius 2 in Top Width 0.58 ft Critical Depth 0.39 ft Percent Full 75.0 Critical Slope 0.00773 fUft Velocity 2.48 ft/s Velocity Head 0.10 ft Specific Energy 0.60 ft Froude Number 0.63 Maximum Discharge 0.82 Wh, Discharge Full 0.76 ft'/s Slope Full 0.00333 tuft Flow Type SubCdtical GVF Input Data Downstream Depth 0 in Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 % Normal Depth Over Rise 75•00 % Downstream Velocity Infinity ft/s Bentley Systems,Inc. Haestad Methods (SELECTserles 1) 108.11.01.031 4/16/2014 8:28:10 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06796 USA +1-203-766-1666 Page 1 of 2 Sewer Main Extension Gran Cielo Subdivision Peaking Factor for Drainage Area 1 Total Wastewater Flow Rate= 115,487 gpd Residential Usage per person= 89 gpd Equivalent Population= 1,298 Q(max) = 18 +P °50 P =Population/thousands Q(ave) 4 +P 0.50 P= 1.298 Peaking Factor = 3.72 Peaking Factor for Drainage Area 2 Wastewater Daily Flow Rate= 1,220 gpd/acre Acres= 19.59 acres Total Wastewater Flow Rate= 23,900 gpd Residential Usage per person= 89 gpd Equivalent Population= 269 Q(m.) = 18 +P 0.50 p=Population/thousands Q(ave) 4 +P 0.50 P= 0.269 Peaking Factor = 4.10 Peaking Factor for Drainage Area 3 Wastewater Daily Flow Rate= 1,950 gpd/acre Acres= 8.95 acres Total Wastewater Flow Rate= 17,453 gpd Residential Usage per person= 89 gpd Equivalent Population= 196 Q(max) = 18 +p 0.50 p=Population/thousands Q(ave) 4 +p 0.50 P= 0.196 Peaking Factor = 4.15 Peaking Factor for Gran Cielo Subdivision VE INN ig � 1 I f . . �� I Ili�1a OM p; LANE JX {�l�i fiEll . 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"�- t; �� '.�r "r/jit��j,�° ��3'� �.:Y( ct r /y//./l ✓�'�•y��,� � 6�/�h'•r .' 1 r s'� �.�; t^.. r/ti � ��., ///r.: i%'/M '✓r'iH'f �'+S� �"r'�% �.. 0 �X/r�tekb�a " 6.�'tr���4'`�� �.: g' p, -k. °�i� , .0 r / y ✓e > 1 -� +s y.�: ", y � � �,r✓ rw„E r - 3a a 'y rr t�✓ h i�/r .�`.r�" 1`'" ''.,/1A Mir✓K.'Yio a G �ra I I t { 1 i i i i I Al a Wh h fi T W rn 3 >q� a' 3 • , N l � Appendix B • City of Bozeman Water Service Calculation Worksheets Residential (2012 IRC) City of Bozeman Water Service Calculation Worksheet Project Address: _2885 Graf Street_ R Gran Cielo MF, LLC ------------------ Property Owner: ------------------------------ General Contractor: CP Build, LLC ------------------------------------------------------------------------------- 1" Permit Number: _______________ Proposed Water Meter Size: ---____-_____-_ Standard Design Water Supply Fixture Units Appliances and Fixtures Fixture Units # of Fixtures Total Bathtub/Combination Tub/Shower 4.0 X 3 = 12 -------- -------- Soaker Tub 10.0 X -------- -------- Shower (per head) 2.0 X 3 = 6 -------- -------- Clothes washer 4.0 X 3 = 12 -------- -------- Dishwasher 1.5 X 3 = 4.5 -------- -------- Hose Bibb 2.5 X 1 = 2.5 -------- -------- Additional Hose Bibb (each) 1.0 X 5 = 5 -------- -------- Lavatory Sink 1.0 X 15 = 15 -------- -------- Kitchen Sink 1.5 X 3 = 4.5 -------- -------- Laundry Sink 1.5 X Water closet (1.6 GPF) 2.5 X 9 = 22.5 -------- -------- Urinal (flushometer valve) Table Values* -------- _ _____--- Total Number of Fixture Units --84--- Fixture Unit Tables for Determining Water Pipe & Meter Size Pressure Range - Over 60 PSI Circle the length in feet to the farthest fixture & applicable service, meter & branch sizes below based on the total number of fixture units detailed above. Maximum Allowable Length in feet Meter & Supply & 60' 80, 100, 150, Q0D Service Branches %11 %11 20 20 19 17 14 %'$ 1" 39 39 36 33 28 1" 1" 39 39 39 36 30 1%" 39 39 39 39 39 1" 1%" 78 78 76 67 52 1%" 1%" 78 78 78 78 66 1%"/2" 85 85 85 85 85 1%" 1%z" 151 151 151 151 128 2" 1%" 151 151 151 151 150 1%" 2" 370 370 340 318 272 2" 2" 370 370 370 370 368 If count is over 370 fixtures, water demand does not meet table 6.10.4 and has to be engineered by a registered Montana mechanical engineers design, signed and stamped. 12.20.17 Residential (2012 IRC) City of Bozeman Water Service Calculation Worksheet Project Address: -2915 Graf Street R Gran Cielo MF, LLC � ------------------- Property Owner: ------------------------------ General Contractor: -CP Build, LLC------------------------------------------------------------------------------ 1" Permit Number: --------------- Proposed Water Meter Size: --------------- Standard Design Water Supply Fixture Units Appliances and Fixtures Fixture Units # of Fixtures Total Bathtub/Combination Tub/Shower 4.0 X 2 - 8 Soaker Tub 10.0 X = -------- -------- Shower (per head) 2.0 X 2 _ 4 - ------ -------- Clothes washer 4.0 X 2 _ 8 Dishwasher 1.5 X 2 = 3 -------- -------- Hose Bibb 2.5 X 1 = 2.5 -------- -------- Additional Hose Bibb (each) 1.0 X 3 = 3 -------- -------- Lavatory Sink 1.0 X 10 _ --10 --- Kitchen Sink 1.5 X 2 _ 3 Laundry Sink 1.5 X -------- _ -------- Water closet (1.6 GPF) 2.5 X 6 _ 15 Urinal (flushometer valve) Table Values* -------- _ -------- Total Number of Fixture Units -- 56.5 - Fixture Unit Tables for Determining Water Pipe & Meter Size Pressure Range - Over 60 PSI Circle the length in feet to the farthest fixture & applicable service, meter & branch sizes below based on the total number of fixture units detailed above. Maximum Allowable Length in feet Meter & Supply & 60' 80, 100, 150' 200' Service Branches 3/" 3/" 20 20 19 17 14 3/" 1" 39 39 36 33 28 1" 1" 39 39 39 36 30 3/" 1%" 39 39 39 39 39 1" 1% 78 78 76 67 52 12 " 1%" 78 78 78 78 66 1" 1%z"/2" 85 85 85 85 85 1%2" 11/z" 151 151 151 151 128 2" 134" 151 151 151 151 150 1%2" 2" 370 370 340 318 272 2" 2" 370 370 370 370 368 If count is over 370 fixtures, water demand does not meet table 6.10.4 and has to be engineered by a registered Montana mechanical engineers design, signed and stamped. 12.20.17 Residential (2012 IRC) City of Bozeman Water Service Calculation Worksheet Project Address: _2781 Graf Street- R Gran Cielo MF, LLC ------------------ Property Owner: ------------------------------ General Contractor: -CP Build, LLC------------------------------------------------------------------------------ 31 Permit Number: --------------- Proposed Water Meter Size: ----4____---__ Standard Design Water Supply Fixture Units Appliances and Fixtures Fixture Units # of Fixtures Total Bathtub/Combination Tub/Shower 4.0 X 1 _ 4 Soaker Tub 10.0 X -------- -------- Shower (per head) 2.0 X 1 _ 2 -------- -------- Clothes washer 4.0 X 1 _ 4 Dishwasher 1.5 X 1 = 1.5 -------- -------- Hose Bibb 2.5 X 1 = 2.5 -------- -------- Additional Hose Bibb (each) 1.0 X 1 = 1 -------- -------- Lavatory Sink 1.0 X 4 _ 4 Kitchen Sink 1.5 X 1 = 1.5 -------- -------- Laundry Sink 1.5 X -------- _ -----__- Water closet (1.6 GPF) 2.5 X 3 _ 7.5 Urinal (flushometer valve) Table Values* -------- _ -------- Total Number of Fixture Units --28--- Fixture Unit Tables for Determining Water Pipe & Meter Size Pressure Range - Over 60 PSI Circle the length in feet to the farthest fixture & applicable service, meter & branch sizes below based on the total number of fixture units detailed above. Maximum Allowable Length in feet Meter & Supply & 60' 80' 100, 150' 200' Service Branches %11 %11 20 20 19 17 14 � I 1" 39 39 36 33 28 V, , 1" 39 39 39 36 30 %11 1%" 39 39 39 39 39 1" 1%" 78 78 76 67 52 1%" 1%" 78 78 78 78 66 1" 1%"/2" 85 85 85 85 85 1%" 1%Z" 151 151 151 151 128 2" 1y" 151 151 151 151 150 1%" 2" 370 370 340 318 272 2" 2" 370 370 370 370 368 If count is over 370 fixtures, water demand does not meet table 6.10.4 and has to be engineered by a registered Montana mechanical engineers design, signed and stamped. 12.20.17 Residential(2018 IRC) City of Bozeman Water Service Calculation Worksheet Project Address: 2821, 2823, 2825 Graf Street Property Owner: Bozeman Haus, LLC General Contractor: CP Build, LLC Permit Number: Proposed Water Meter Size: 1 1/2" UPC Table 610.3 Standard Design Water Supply Fixture Units Appliances and Fixtures Fixture Units #of Fixtures Total Bathtub or combo tub/shower(1/2"fill valve) 4.0 X 3 = 12 Bath Tub(3/4'fill valve) 10.0 X = Shower(per head) 2.0 X 6 = 12 Clothes washer 4.0 X 3 = 12 Dishwasher 1.5 X 3 = 4.5 Hose Bibb 2.5 X 1 = 2.5 Additional Hose Bibb(each) 1.0 X 2 = 2 Lavatory Sink 1.0 X 15 = 15 Kitchen Sink 1.5 X 3 = 4.5 Laundry Sink 1.5 X = Water closet[toilet)(1.6 GPF) 2.5 X 12 = 30 Bidet 1.0 X = Urinal(flushometer valve) Table Values* _ Total Number of Fixture Units 94.5 Fixture Unit Tables for Determining Water Pipe&Meter Size Pressure Range—46-60 PSI Circle the length in feet to the farthest fixture&applicable service,meter&branch sizes below based on the total number of fixture units detailed above. Maximum Allowable Length in feet Meter& Supply& 60' 80, 100, 150' 200' Service Branches %" %" 20 19 17 14 11 %" 1" 39 36 33 28 23 1" 1" 39 39 36 30 25 %" 1'/0" 39 39 39 39 39 1" 1%" 78 76 67 52 44 1%:" 1'/<" 78 78 78 66 52 1" 1'/x"12" 85 85 85 85 85 1Y1 1%z" 151 151 151 128 105 2" 1%" 151 151 151 150 117 1%2' 2" 370 340 318 272 240 2" 2" 370 370 370 368 318 If count is over 370 fixtures,water demand does not meet table 610.4 and must be engineered by a registered Montana mechanical engineers design,signed and stamped. 04.29.20 Residential(2018 IRC) City of Bozeman Water Service Calculation Worksheet Project Address: 2723, 2725 Graf Street Property Owner: Bozeman Haus, LLC General Contractor: CP Build, LLC Permit Number: Proposed Water Meter Size: 1" UPC Table 610.3 Standard Design Water Supply Fixture Units Appliances and Fixtures Fixture Units #of Fixtures Total Bathtub or combo tub/shower(1/2"fill valve) 4.0 X 2 = 8 Bath Tub(3/4"fill valve) 10.0 X Shower(per head) 2.0 X 4 = 8 Clothes washer 4.0 X 2 = 8 Dishwasher 1.5 X 2 = 3 Hose Bibb 2.5 X 1 = 2.5 Additional Hose Bibb(each) 1.0 X 1 = 1 Lavatory Sink 1.0 X 10 = 10 Kitchen Sink 1.5 X 2 = 3 Laundry Sink 1.5 X = Water closet[toilet] (1.6 GPF) 2.5 X 8 = 20 Bidet 1.0 X = Urinal(flushometer valve) Table Values* _ Total Number of Fixture Units 63.5 Fixture Unit Tables for Determining Water Pipe&Meter Size Pressure Range—46-60 PSI Circle the length in feet to the farthest fixture&applicable service,meter&branch sizes below based on the total number of fixture units detailed above. Maximum Allowable Length in feet Meter& Supply& 60' 80' 100' 150' 200' Service Branches %" %" 20 19 17 14 11 %" 1" 39 36 33 28 23 1" 1" 39 39 36 30 25 %" 1'/<" 39 39 39 39 39 1" 1%" 78 76 67 52 44 1%2" 1%" 78 78 78 66 52 1" 1%2"12" 85 85 85 85 85 1'/:" 1%" 151 151 151 128 105 2" 1%:" 151 151 151 150 117 1%' 2" 370 340 318 272 240 2" 2" 370 370 370 368 318 If count is over 370 fixtures,water demand does not meet table 610.4 and must be engineered by a registered Montana mechanical engineers design,signed and stamped. 04.29.20 Appendix C • Gran Cielo Subdivision Water Main Design Report WATER MAIN DESIGN REPORT FOR: GRAN CIELO SUBDIVISION BOZEMAN, MT Prepared By: MADISON > ENGINEERING 1 Madison Engineering 895 Technology Drive, Suite 203 k Bozeman, MT 59718 (406) 586-0262 Y NOVEMBER 2018 �Z L WATER MAIN DESIGN REPORT FOR: GRAN CIELO SUBDIVISION BOZEMAN, MT ® •' CiiRfS C. '�® ' Madison Engineering 895 Technology Blvd Ste 203 Bozeman, MT 59718 (406) 586-0262 NOVEMBER 2018 GRAN CIELO SUBDIVISION WATER MAIN DESIGN REPORT A. General This design report will give an overview of the proposed 8" and 12" water main extensions for the development of the Gran Cielo Subdivision, located at the intersection of S. 27th Ave and Graf Street in Bozeman. The 48.75-acre subdivision is zoned R-3 and R-4, and will consist of single-unit, two-unit, and multi-unit residences. The proposed improvements are anticipated to be phased, with the first phase being constructed during the spring/summer of 2018. This report includes a description of the proposed water main extensions and design parameters. Once the water main is constructed and approved, the main will become a part of the City of Bozeman(COB) system. The following references were used in the preparation of this report: a. COB Design Standards and Specifications Policy,2004. Addendum#6 b. COB Modifications to Montana Public Works Standard Specifications(MPWSS),Addendum#3. c. WQB Circular No. 1 d. City of Bozeman Zoning Map e. Uniform Plumbing Code f. City of Bozeman Water Facility Plan Update,July 2017 B. Existing Water Supply The proposed water main extensions will be served from the existing COB water distribution system at the corner of Graf Street and S. 27th Avenue. The following information regarding pressures of the existing system was obtained from the City of Bozeman. The City conducted a test on 3/16/18 at the intersection of Lantern Lane and Enterprise Boulevard: Distribution Main Capacity—Fire flow at minimum residual pressure Q,=Qtp( "Pm)/(PS—Pr)]0 54 Q,= 1,250[(65—20)/(65—56)]o s4 Q,=2,981 gpm at 20 psi Qt= Hydrant Discharge During Test(gpm) Q,= Fire Flow at Minimum Residual Pressure(psi) P,= Static Pressure(psi) PR = Minimum Residual Pressure(psi) P, = Residual Pressure(psi) P,= Pitot Pressure(psi) Gran Cielo Subdivision Water Design Report Page 1 of 3 C. Proposed Water System The proposed water main extensions will consist of approximately 12,078 linear feet (2.3 miles) of Class 51 Ductile Iron Pipe. The proposed 12" water main will connect to the existing 12" ductile iron stub at the intersection of Graf St and S. 271h and extend west along the proposed extension to Graf St for approximately 1,304 linear feet as well as north along S. 27th Ave for approximately 2,058 linear feet. The connection points will be isolated via new gate valves in order to provide separate connections. Approximately 8,716 linear feet of 8" water main will be looped throughout the site to provide service to the remainder of the subdivision. The water main sized according to the City of Bozeman Water Facility Plan Update. A figure of the proposed COB system by water main diameter is provided in the Appendix. The layout of the proposed water main meets the COB design criteria and will be located within the easements/Right of Way and separated from the proposed sanitary sewer main by a minimum distance of 10 feet. Fire hydrants will be installed so not to exceed 600' spacing, fulfilling the distance requirement for fire hydrant spacing, as well as assisting in flushing of the main. Gate valves will be installed at the connection point to the existing mains as well as pipe intersections, per City standards. Blow-offs have been designed for all 8" dead-end lines that will be extended in the future, and hydrants have been provided for the 12" dead-end lines in Graf Street and S. 27th Ave. D. Capacity Analysis A capacity analysis was performed on the proposed water main extension. The water main will serve all four proposed phases of the Gran Cielo Subdivision, which consists of 39.80 acres of R- 3, residential medium density, and 8.95 acres of R-4, residential high density. The water main extension has been designed to meet the maximum day demand plus fire flow during the peak hour. Based on Table 4.B.4 of the City of Bozeman Water Facility Plan, the City's design standards for an R-3 and R-4 residential lot is 6.5 and 10.4 units per gross acre, respectively. The analysis, was completed based on 170 gpd per capita usage and 2.11 persons per unit. The main will be looped into the existing City of Bozeman system, however calculations were based on a dead end. line to be conservative. Table 1 shows the water demand for the entire subdivision. TABLE 1 WATER DEMAND—RESIDENTIAL Units/ Density Total Per Capita Flow Flow Zoning Acres Acre residents/unit Residents d/resident d R-4 8.95 10.4 _ 2.11 197 170 33,490 Total Flow ( d) 126,310 Total Flow (gpp 263 Gran Cielo Subdivision Water Design Report Page 2 of 3 It is anticipated the average daily demand for the residential units will be 263 gpm, based on an 8-hour day. In addition to the average daily demand, the water main extension must account for peak periods of daily use. Peaking factors are applied to the demand and account for these peak periods in daily use. The peaking factors used are maximum daily use and peak hour and are obtained from the City of Bozeman Design Standards. Table 2 shows the peaking factors and the resultant flows from those factors when applied to the average daily demand of 263 gpm. TABLE 2 PEAKING FACTORS Flow Designation Peaking Factor Flow m Aye e Day Demand 1 263 Maximum Day Demand 2.3 605 Maximum Hour Demand 3 789 The required fire flow for a Type V-B structure is 1,500 gpm. With a fire flow demand of 1,500 gpm and a peak hour demand of 789 gpm, a peak hour flow of 2,289 gpm (5.10 cfs) is required. A Hazen-Williams "C" Factor of 130 was used in the pipe evaluation. The working residual water pressure shall not be less than 20 psi at any point in the water distribution system under maximum day plus fire flow. The velocity shall not exceed 15 feet per second through the main line. E. Results Flow analysis of the 8-inch D.I. pipe with a C value of 130 can provide the required 2,289 gpm with a maximum pipe velocity of 14.6 ft/s. The pressure will not drop below the minimum of 20 psi. Flow analysis of the 12-inch D.I. pipe with a C value of 130 can provide the required 2,289 gpm with a maximum pipe velocity of 6.5 ft/s. The pressure will not drop below the minimum of 20 psi. Capacity analysis calculations outlining the capacity of the proposed 8-inch and 12- inch pipes is included in the appendix of this report. F. Conclusion Based on this analysis, the proposed 8-inch and 12-inch water main extensions for the proposed Gran Cielo Subdivision provide adequate service to meet the peak hour demand and fire flows for the development. This project will require the approval of the City Engineer and MDEQ. Appendix 1. Water Main Capacity Analysis 2. Capacity Analysis Exhibit 3. City of Bozeman Proposed Water Distribution System Figure 9-2 Gran Cielo Subdivision Water Design Report Page 3 of 3 8" Ductile Iron Water Main Project Description Friction Method Hazen-Williams Formula Solve For Pressure at 2 Input Data Pressure 1 65.00 psi Elevation 1 4967.80 Elevation 2 4946.18 ft Length 1336.00 ft Roughness Coefficient 130.000 Diameter 8.00 in Discharge 2289.00 gal/min Results Pressure 2 25.32 psi Headloss 113.15 ft Energy Grade 1 5121.04 ft Energy Grade 2 5007.90 ft Hydraulic Grade 1 5117.73 ft Hydraulic Grade 2 5004.58 ft Flow Area 0.35 ft2 Wetted Perimeter 2.09 ft Velocity 14.61 ft/s Velocity Head 3.32 ft Friction Slope 0.08469 ft/ft Bentley Systems,Inc. Haestad Methods Solft ntlOpfflowMaster V81(SELECTseries 1) [08.11.01.031 11/20/2018 9:15:50 AM 27 Siemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-765-1666 Page 1 of 1 12" Ductile Iron Water Main Pro)ect Description Friction Method Hazen-Williams Formula Solve For Pressure at 2 Input Data Pressure 1 65.00 psi Elevation 1 4969.92 ft Elevation 2 4939.60 ft Length 2037.00 ft Roughness Coefficient 130.000 Diameter 12.00 In Discharge 228900 gal/min Results Pressure 2 67.76 psi Headloss 23.94 ft Energy Grade 1 5120.50 ft Energy Grade 2 5096.56 ft Hydraulic Grade 1 5119.85 ft Hydraulic Grade 2 5095.90 ft Flow Area 0.79 ftz Wetted Perimeter 3.14 ft Velocity 6.49 ft/s Velocity Head 0.66 ft Friction Slope 0.01175 ft/ft Bentley Systems,Inc. 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