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HomeMy WebLinkAbout14 - Design Report - Cattail Properties - Water, Wastewater ENGINEERING 8. CONSULTING 'NEIS�+ PLANNING NGINEERING, INC DESIGN 204 N0011 Mh AVENUE,Houmm'Fir 59715 204 N.II"Ave. BOZEMAN,PAT 5971S 406-S81-3319 wmv.g-e-i.oet Water and Wastewater Design Report Cattail Properties Major Subdivision SW1/4 NW1/4& NW1/4 SW1/4,Sec 35 T1S R5E LOTS 3 &4, BLOCK 10, CATTAIL CREEK SUBDIVISION, PHASE 2A& 2B Bozeman, Montana OCTOBER 2014 Prepared By: Genesis Engineering, Inc. GEI Project#: 1097.001.040 Prepared For: Taylor Properties, Inc. 20101 SW Birch St,Suite 151 Newport Beach, CA 92660-1749 204 N. 11`t'Ave.,Bozeman,MT 59715 Cell:(406)581-3319 wwvw.q-e-i.net Page 1 of 7 NCatfdi~EF2tNfir,IhiC zS sr�unbgox,.rtv,;aat,.,.(,.sm.efyr Water and Wastewater Design Report Table of Contents 1. Project Background............................................................................................................. 3 1. Introduction.............................................................................................................................. 3 2. Soil and Groundwater............................................................................................................. 3 3. Land Use.................................................................................................................................... 3 4. Design Standards..................................................................................................................... 3 If. Sanitary Sewer System................................................................................................. 4 1. Projected Flows........................................................................................................................ 4 2. Collection System.................................................................................................................... 4 3. Service Connections................................................................................................................ 4 Ill. Water System.................................................................................................................... S 1. Projected Usage....................................................................................................................... 5 2. Hydraulic Analysis.................................................................................................................... 5 3. Water Distribution System..................................................................................................... 5 4. Service Connections....................................:........................................................................... 6 IV. Conclusion......................................................................................................................... 6 Appendix A—Drawings&Watercad List of References City of Bozeman Design Standards and Specifications Policy, March 2004, and all addenda. Montana Public Works Standard Specifications(MPWSS),6th Edition City of Bozeman Modifications to the MPWSS, March 2011 Montana Department of Environmental Quality(MDEQ) Design Circulars DEQ-1 and DEQ-2 Design Report for the Cattail Creek Subdivision, Phase 2A&213,TD&H, May 2002. 204 N. 11`h Ave.,Bozeman,M w T 59715 Cell:(406)581-3319 ww.g-e-i.net Page 2 of 7 11:\1097\001\DOCS\PUD Submittal\working folder\WaterWastewaterDR.doc f hlGiNE�RINt3,[NC JZe h,pieni�aJa;.rn.4usa'.lw foambm.rt 1. Project Background 1-1. Introduction The Cattail Properties Major Subdivision is a proposed 8-lot commercial development of approximately 25 acres located in Section 35,T1S, R5E, PMM in Bozeman,Gallatin County, Montana. The property lies on the southwest corner of the intersection of Cattail Street and Blackbird Drive. This report describes the water and wastewater systems that will be required to service the Cattail Properties Major Subdivision. The proposed water and wastewater infrastructure will be connected to the public water and sewer systems owned and maintained by the City of Bozeman. 1-2. Soils The NRCS Soil Survey identifies two major soil types on the proposed subdivision: Meadowcreek loam(510B) and Enbar loam(509B). These soils belong to hydrologic soil group B as they are comprised primarily of foams with moderately high saturated hydraulic conductivity. 1-3. Land Use The pre-development land use on the proposed major subdivision is vacant land which is not currently being used for grazing or other agricultural production. Upon development,the Owners anticipate that the subdivision will consist of 50 Townhouse Lots. 1-4. Design Standards All sanitary sewer mains,water mains,service connections,and appurtenances will be designed and constructed in accordance with the Montana Public Works Standard Specifications(MPWSS), 6"'Edition;City of Bozeman Design Standards and Specifications Policy(including Addenda 1-4), March 2004;City of Bozernan Modifications to the MPWSS, March 2011;the Montana Department of Environmental Quality(MDEQ) Design Circulars DEQ-1 and DEQ-2, and any additional addenda thereof. The City of Bozeman will assume operation and maintenance of the wastewater and water systems and appurtenances upon construction and acceptance of the installation. 204 N.11`h Ave.,Bozeman,MT 59715 Cell:(406)581-3319 www.o-e-i.net Page 3 of 7 H:\1097\001\D0CS\PUD Submittal\working folder\WaterWastewaterDR.doc � �NGtNEERINNGG,INC 11. Sanitary Sewer System 11-1. Proposed Design Flow The proposed subdivision includes 50 residential townhome lots on approximately 5.21 acres. Average day flows were calculated using the City of Bozeman standard of 2.11 persons per residential unit at 89 gpd per person. The estimated Average Daily Flow from the subdivision is 9,390 gpd. Average Daily Flowrate=(50 units)x(2.11 people/unit)x(89 gpd/person)=9,390 gpd The City of Bozeman standard 2.11 persons per residential unit was multiplied by 50 units to determine an equivalent population for the subdivision of 106 people,yielding a peaking factor of 4.23.The peaking factor, PF,was calculated by the following formula,where P=population(thousands): PF=18+P"s 4+po.s Using peak hour factor of 4.23 was and adding the City's infiltration allowance of 150 gallons per acre per day resulted in a combined peak hourly flowrate of 40,501 gpd. Peak Hourly Flowrate=ADF x PHF+150 gpd/acre Peak Hourly Flowrate=9,390gpd x 4.23+150 gpd x 5.21=40,501 gpd Using Manning's Equation and a minimum slope of 0.004 ft/ft for an 8-inch diameter pipe,the full-flow capacity of the pipe is 0.76 cfs or 497,629 gallons per day. The empirically-based peak design flow Occupies 8%of the proposed pipe. The full flow velocity of the 8-inch diameter SDR-35 main is 2.2 ft/sec, exceeding the minimum of 2.0 ft/sec required. 11-2. Collection System The wastewater will be collected internally with 8-inch sewer mains as depicted in the attached exhibit. The internal mains collect in the northeast corner of the subdivision and discharge into the existing 8-inch sewer main in Blackbird Drive. The existing 8-inch main in Blackbird Drive continues north to Cattail Street where it is intercepted by a 24-inch sewer main. Seven(7)48-inch sanitary sewer manholes are proposed along the main internal to the subdivision,with one additional 48-inch manhole in Blackbird Drive. The maximum distance between manholes is less than 400 feet as per City regulations. The slope of the pipe segments are all greater than or equal to 0.40%,which satisfies City requirements for minimum slope of an 8-inch pipe. 11-3. Service Connections Service connections(4-inch)are proposed for each lot. Connections to the sanitary sewer mains will be designed in accordance with the City's Design Standards and Specifications Policy. Connections to the sewer main will be made with in-line gasketed wyes. 204 N. 11`h Ave.,Bozeman,M mv �,/.q-e-i.net 59715 Cell:(406)581-3319 ww .g-e-i.net Page 4 of 7 H:\1097\001\DOCS\PUD Submittal\working folder\WaterWastewaterDR.doc NG{NEERING,INC Ill, Water System III-1. Projected Usage The Cattail Properties Major Subdivision consists of 50 proposed townhome lots. Using the City of Bozeman empirical data of 170 gpd/person,Genesis estimates a total average daily demand (ADD)of 12.5 gallons per minute. Using the City's max day flow factor of 2.3,results in a maximum daily demand of 28.7 gpm. Multiplying the average daily flow by the City's peak hour factor of 3,results in a peak hour demand of 37.4 gpm. Local landscape watering is included in the empirical data.Watering of the major park areas will be completed using onsite wells. The average daily demands are exclusive of the suggested fire flow requirement of 2000 gallons per minute. When modeled,the system design satisfies the fire flow occurring simultaneously with the maximum day demands inclusive of the proposed subdivision. Average Daily Flowrate=(50 units)x(2.11 people/unit)x(170 gpd/person)=17,935 gpd 17,935 gpd/1440 min per day=12.45 gpm Maximum Daily Flowrate=ADF x 2.3=12.45 gpm x 2.3=28.7 gpm Peak Hour Flowrate=ADF x 3=12.45 gpm x 3=37.4 gpm III-2. Hydraulic Analysis The hydraulic modeling program WaterCAD was used to model domestic and fire protection demands for the proposed major subdivision. Results from the water modeling program are included within Appendix A of this report. The modeling assigned junction nodes within the development with demands for average day, maximum day, and peak hour flows. City design guidelines specify that the peaking factors for these scenarios be 1,2.3, and 3 respectively. Fire hydrant flow data was obtained for the hydrant located on the west side of Blackbird Drive, south of the intersection with Cattail Street was used as the input data for connection points of the model to the existing system. The flow data and model calibration data are included in Appendix A of this report. The model results indicate junction pressures ranging from 102.5 psi at the hydrant on Blackbird Drive (Junction 4),to 99 psi at the southwest end of the subdivision(Junction 7) under average day demands. City of Bozeman Design Standards require the installation of pressure reducing valves when the anticipated average- day line pressure exceeds 120 psi. Total System Maximum Day Demand—29 gpm Available Fire Flow - 3,130 gpm at 51.88 psi(node 11) Maximum System Pressure—102.5 psi(node 4)during average daily flows Minimum System Pressure—20 psi at node 9 during fire flow scenario (Please see Appendix B for model calculations) III-3. Water Distribution System Approximately 1,600 lineal feet of 8-inch diameter ductile iron pipe(DIP)Class 51 water main will be installed in the proposed subdivision. The new mains will be connected to existing 12-inch DIP water main in Cattail Street,and the existing 8-inch DIP water main in Blackbird Drive. All proposed water mains will be designed to meet the 10-foot horizontal and 18-inch vertical separation requirements from all proposed sanitary and storm sewer mains. 204 N.111h Ave.,Bozeman,MT 59715 Cell:(406)581-3319 v wAv.a-e-i.net Page 5 of 7 H:\1097\001\DOCS\PUD Submittal\working fold er\WateMastewaterDR.doc NESIS NGINEERING,INC III-4. Service Connections Future service connections to the water mains will be designed in accordance with the City's Design Standards and Specifications Policy and sized based on the projected usage for each service line. Service lines less than 4 inches in diameter will be type"K"copper pipe,while those larger than 4 inches will be ductile iron. Water services will meet all applicable design standards and flow requirements. IV. Conclusion The analysis and calculations included in this report demonstrate that the proposed designs for water provision, including fire flow, and wastewater-disposal satisfy state and local design requirements. 204 N. 111"Ave.,Bozeman,MT 59715 Cell:(406)581-3319 www.o-e-i.net Page 6 of 7 11:\1097\001\DOCS\PUD Submittal\working fold er\WateMastewaterDR.doc N ih3EERIMCr,INN Appendix A Drawings & WaterCAD 204 N. I Vh Ave.,Bozeman,MT 59715 Cell:(406)581-3319 www.g-e-i.net Page 7 of 7 H:\1097\001\DOCS\PUD Submittal\working folder\WaterWastewaterDR.doc EXISTING B'WATER MAIN �• / 0.1 �\ EXISTING 8'SEWER MAIN EXISTING 24"S7RMAIN EXISTING 12-WATER MAIN t ' I I, s I0 A O O _ I i el]I I I . —IL 8 I I 77 I I V r sssn � i J•D]i Npy 41'4B'E I� 21gZo' Nap'11'90'E GRAPHIC SCALE 40 p 20 40 VERIFY SCALE (IN FEET) REVISIONS 1 inch- 40 it 11"%1 T;1'E BO R 1E i.LW uBUowYBE O. DESCRIPTION DRgWN BV: Rom_ REoucEv.LwE eEiDw DATE By PROJECT NUMBER NEASURE90DNEINCH ON CHK'D.BY: CATTAIL PROPERTIES 1097.001 DRIGNUL RAWwG. /G,, *���E��yyf///���� I`I( ■E S I C—u 11 BY., BOZEMAN SHEET NUMBER i CansWlirr9 204 N.11th Ave. NOWFY SGLE ACLOROINCLY INCteNr Bozeman,MT 59715 DATE:10t2014 MT NGINEERING, I ^ Plann/p Plrona:(408)681-3319 DRAWINGNUMBER H:110971001iACAD\utNlty-mastecdW'g Plotted by Jeremy may on 10/17@014 1250 PMO.A.REVIEW 7keBr innirt o a,Nno,Sf4nJorda Commitment CDWRIGHIOGEN[SISFNDMEERwO.WC.t011 DAT S WATER 8t SEWER LAYOUT LITIL-1 Fire Flow Analysis Fire Flow Deport Node Needed Total Satisfies Available Residual Calculated inimumZone Calculated MinimurtlinimumSysteri Calculated Minimum Label Fire Flow Needed Fire Flow Fire Pressure Residual Pressure ]AinimumZone Zone Pressure Minimum Syste mSystem (gpm) Fire Flow ConstraintsFlow (psi) Pressure (psi) Pressure Junction (psi) Pressure ,Junction (gpm) (gpm) (psi) (psi) (psi) J-3 2,000.00 2,000.00 true 4,389.96 20.00 23.03 20.00 20.00 J-7 20.00 20.00 J-7 J-4 2,000.00 2,000,00 true 4,301.88 20,00 22.39 20.00 20.00 J-7 20.00 20.00 J-7 J-5 2,000.00 2,002.30 true 3,899.55 20.00 20.00 20.00 20.92 J-7 20.00 20.92 J-7 J-6 2:000.00 2,002.30 true 3,853.89 20.00 21,30 20.00 20.00 J-7 20.00 20.00 J-7 J-7 2,000,00 2,000.00 true 3,593.50 20.00 20,00 20.00 30.87 J-6 20.00 30.87 J-6 J-8 2,000.00 2,010.81 true 4,119.12 20.00 20.00 20.00 20.56 J-7 20.00 20.56 J-7 J-9 2,000.00 2,000.00 true 4,105.19 20,00 20.43 20.00 20.00 J-11 20.00 20.00 J-11 J-10 2,000.00 2,013.80 true 4,175.87 20.00 21.51 20.00 20.00 J-7 20,00 20.00 J-7 J-11 12,000.0012,000.001 true 13,130.611 20.001 20.00 20,001 51.88 J-9 20.00 51,88 J-9 Title:Cattail Properties Project Engineer:Genesis Engineering Inc. ):\...\001\docs\design\water\watercad\cattail2.wcd WaterCAD v3.0[0511 10/17/14 10:50:09 AM ©Haestad Methods,Inc. 37 Brookside Road Waterbury,CT 06708 USA (203)755-1666 Page 1 of 1 Steady State Analysis Junction Report AVERAGE DAY FLOWS Node Elevation Demand Demand Demand Calculated Hydraulic Pressure Label (ft) Type (gpm) Pattern Demand Grade (psi) (gpm) (ft) J-3 41,649,00 Demand 0,00 Fixed 0.00 4,885.00 102.05 J-4 4,648.00 demand 0.00 Fixed 0.00 4,885.00 102.49 J-5 4,652.00 Demand 1.00 Fixed 1.00 4,885.00 100.76 J-6 4,653.00 Demand 1.00 Fixed 1.00 4,885.00 100.32 J-7 4,656.00 Demand 0.00 Fixed 0.00 4,885.00 99.03 J-8 4,653.00 Demand 4.70 Fixed 4.70 4,885.00 100,32 J-9 4,653,00 Demand 0.00 Fixed 0.00 4,885.00 100.32 J-10 4,650.00 Demand 6.00 Fixed &00 4,885.00 101.62 J-1 1. 14,654.001 Demand 1 0.00 1 Fixed 1 0.00 4,885.00 99.89 itfe: Cattail Properties Project Engineer:Genesis Engineering Inc. :\...kOO1\docs\design\water\watercad\cattail2.wcd WaterCAD v3.0[051] 0/17/14 11:05:45 AM D Haestad Methods,Inc. 37 Brookside Road Waterbury,CT 06708 USA (203)755-1666 Page 1 of 1 •l /f t P 3 f � '1tJ R 1 � ,�2 t , r • i, , � p 112 PI , t i 1,$ ........--- i __...- - P_ P 13 `