The URL can be used to link to this page

Home My WebLink About09 - Sewer Design Report (this page left blank intentionally) 2 INTRODUCTION This report is the basis of design for sanitary sewer service to the proposed Gallatin County Courts (GCC) Building. The proposed building will be located on the County’s Law and Justice Center, east of the South 19th Avenue/West Dickerson Street intersection and north of the College Street/South 16th Avenue intersection, in Bozeman, Montana. The GCC building is the northwestern building on the attached copy of Sheet C-100 (Civil Site Plan). The proposed GCC building will replace two existing buildings on the site: the Law and Justice Building, and the Courts Annex attached to its northwest corner. The 18.94-acre Law and Justice Center site is shared with three other existing buildings that will remain: the Detention Center, Pre-Release Building and Document Storage Building. The portion of the site associated with the proposed GCC building, including all required parking and circulation, is approximately 1/3 of the site, or about 6.33 acres. PROPOSED SANITARY SEWER IMPROVEMENTS The GCC building will require a single sanitary sewer connection to an existing 8-inch City of Bozeman sewer main located approximately 16 feet west of the site. A 6-inch service line is proposed as per the calculations in this report. No sewer mains are proposed Proposed Average Daily Flow Rate: Based on Table V-2 of the City of Bozeman Design Standards, for Public Institutions, the 6.33-acre site would generate an average flow rate, in gallons per day (gpd) of: (6.33 acres) x (1,030 gal/acre/day) = 6,520 gpd Another calculation was done based on Table 3.1-1 of the Montana Department of Environmental Quality’s Circular DEQ-4. The GCC building will have approximately 368 employees and a maximum of 1,541 visitors within various conference rooms, jury assembly/court rooms, lobby and other publicly accessible spaces. Using the typical “office” value of 13 gpd per employee and “shopping center customer” value of 3 gpd per visitor, the building would generate an average flow rate of: (368 employees x 13 gpd/employee) + (1,541 visitors x 3 gpd/visitor) = 9,407 gpd The average of the above values, 7,964 gpd, will be used in the following calculations and exceeds City requirements per Table V-2. Total Average Daily Wastewater Flow = 7,964 gpd = 5.53 gpm Proposed Peak Flow Rate: Peaking Factor: Population = 368 + 1,541 = 1,909 (P = 1.909) Qmax. = 18 + P½ = 18 + (1.909)½ = 3.60 Qavg. 4 + P½ 4 + (1.909)½ Peak Wastewater Flow Rate = 5.53 x 3.60 = 19.91 gpm HYDRAULIC CAPACITY At the above peak flow rate of 19.91 gpm, the proposed 6-inch diameter PVC service line at 3.00 percent would be at 12.8 percent full. Flow calculations and a partial copy of Sheet C-101 (Site Utility Plan - North) are attached. 3 The proposed GCC building will replace two existing buildings that are being demolished as part of the project. The population in the new GCC building will be considerably less than that of the previous use of the site, because a) all City-related employees and visitors are now housed in the new Bozeman Public Safety Center; and b) a majority of the Gallatin County Sheriff’s Department has also been moved offsite. Therefore, the overall effect on the City’s wastewater conveyance and treatment capacity would be minimal to non-existent. REGULATORY COMPLIANCE The proposed gravity sewer service line will be constructed in accordance with the Montana Public Works standard specifications (MPWSS), 6th edition, and to the City of Bozeman Modifications to MPWSS. The sewer service will be 6-inch diameter SDR 35 polyvinyl Chloride (PVC). There are no expected environmental impacts from this sewer main extension, as the City of Bozeman Wastewater Treatment Plant has adequate capacity for the proposed development. PPTVPTVPTVPPPTVTVPPEW EWEWEWEWEWEWEWEWESESESESESESESESES ES ES ESESESESESES ES ES ES ESBPBP BP BP BP BP EWEWEWEWEWGGGGGGGGGGGGGGGG GGGG G G GGGGGGGGGGG G G GGGGGGGGGGGGBP BPBP BPBPBPBPBPBPBPBPCMCMCMCMCMCMCMCMGGGGGGGGGGGBP BP BP BP BP BPBPBPBPBPBP BP BPBP BP BP BP BP BP BPTT T T TTTTTTTTTTTTBPBPBPGGGCMCMBPBPBPCMCMEWEWEWWWWWWWWWWWWEWEWEWEWEWW WGGGGGBPBPBPBPBPCMCMCMCMCMCMCMCMCMCM ESESESESESESES ES ES ES ES ESW ESESESESESESESESESES ES ESBPBPESESWWWWWWWWWW ESESESESESESESESW W W W W W 29.5'54.4'38.0'//////////////////////////////////////////////////////////////////////////////ESD ESD ESD ESD ESD ESD BF BF BF BF BF BF BF BFBFBFBFBFBTBTBTBTBTBTBTBTBTBTBTBTBTNGNGNGNGNGNGNGNGNGNGNGBPBPBPBPBPBPBPBPBPBPBT BT BT BT BT BT BT BT BT BT NGNGNGNGNGNGNGNGNGNGBTBTBTBTBTBTBTBTBTBTBT BT BT BT BT BT BT BT BT BT BPBPBPBPBPBPBPBPBPBPBPBTBTBTBTBTBTBTBTNGNGNGNGNGNGNGBTBTBTBTBTBTBTBPBPBPBPBFBFBFBFBFBFBFBFNG NG NG NG NG NG NG NG NG NG NG NG BP BP BP BP BP BP BP BP BP BT BT BT BT BT BT BT BT BT BT BT BT BT BT BT ////// /////////////////////////////////////////////////// /// ////// //////////// /// /// /// /////////////////////////////////O////// ///////////////////////////////////////////////////////////////////////////////////////////////////O//////////// /// ////////////////// /// ////////////OOOXXXO WES ESESESES ES ES ES ES ES ES ES ES ES ES ES ES ES ES ES ES ES ESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESESES ES ES ES ES ES WWWWWW BPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBT BT BT BT BT BT BT BT BT BT BTNGNGNGNGNGNGNGNGNGNGNGNGNGNG///////////////////////////////// /// /////////////// /// ////////////////// /// ///////////////////////////////////////////////////////////////ESESESESESESESESESESESESESESESESESESESWWNGNG NG NG BT BT///////// //////////////////4825482548254830483048254830483048354834483648304835483548304835483548354831483248324831483348344834483448334832483248334834483248314831 4832482948294835483448344834483348354834483248344834483748334835483448334833483448354836483748384828482848324832WES 0+001+002+003+004+005+006+007+008+009+009+80OOOOOOOO O OOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOO O OOOOOO OOOO OOOOOOOOOOO O O O O O O O O O O O O OO O O O O O O O O O O O 8SD24SD24SD 24SD 24SD 24SD18SD12SD 6W6W6W6W8W8W8W8W8W8W8W8W8W8W8W8W8W 8W 8W 8W 8W 8W12SD15SD 15SD18SD SS8W8W8W 24SD24SD24SD24SDBTBTBPBPBPBPBPBPBPBP BP BP12SD12SD NGNGBP 24SD 24SD 12SD12SD12SD6SD24SD 24SD 24SD 12SD12SD6SD6SD24SD24SD24SDWS >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>4830 >>>>4830482248234822482448224825>WWPWWPWBPWBEBEESSESSESSSEXISTING PRE-RELEASE BUILDING(TO REMAIN)LEGENDFIRE HYDRANTYLIGHT POLESTORM DRAIN MANHOLE/VAULTSAN. SEWER MANHOLESTORM DRAIN CURB INLETSIGNEXISTING TREE-CONIFEREXISTING TREE-DECIDUOUSTEST PIT (SEE GEOTECHNICAL REPORT)WATER VALVE//////BPBPNGNGWWEXISTING ASPHALT EDGEPROPOSED ELEC. LINEPROPOSED GAS LINEPROPOSED WATER LINEESESEXISTING SEWER MAINBPBPNGNGWWEXISTING ELEC. LINEEXISTING GAS LINEEXISTING WATER LINESDSDPROPOSED STORM DRAINSDSDEXISTING STORM DRAINTOP BACK OF CURB ELEVATIONTBCEDGE OF GUTTER ELEVATIONEGGRADING LIMITSDRAINAGE SWALE/PATHFOEXISTING FIBER OPTIC LINEFOPROPOSED FIBER OPTICEXISTING BUILDINGC-100CIVIL SITE PLANSOUTH 15TH AVE.SOUTH 16TH AVE.WEST DICKERSON ST.NORTH ACCESS DRIVEProject Number:Drawn By:Reviewed By:Approved By:2200.049CJFMGHMGHGALLATIN COUNTYCOURTS615 SOUTH 16TH AVENUE,BOZEMAN, MONTANA, 597152200.049Issue Date08 JULY 2022CONSTRUCTION DOCUMENTSGALLATIN COUNTYGallatin County Commission311 West Main StreetBozeman, MT, 59715Telephone: 406-582-2300ThinkOne Architects101 E Main St. Studio 1Bozeman, MT, 59715T: 406-586-7020ArchitectAndersonMasonDale Architects, P.C.3198 Speer BoulevardDenver, CO 80211T: 303-294-9448Associate ArchitectMorrison-Maierle, Inc.2880 Technology Blvd.Bozeman, MT 59715T: 406-587-0721Civil EngineerMorrison-Maierle, Inc.2880 Technology Blvd.Bozeman, MT 59715T: 406-587-0721Structural EngineerMorrison-Maierle, Inc.2880 Technology Blvd.Bozeman, MT 59715T: 406-587-0721Mechanical EngineerMorrison-Maierle, Inc.2880 Technology Blvd.Bozeman, MT 59715T: 406-587-0721Plumbing EngineerMorrison-Maierle, Inc.2880 Technology Blvd.Bozeman, MT 59715T: 406-587-0721Electrical Engineer11/9/2021 1:30:52 PMengineers surveyors planners scientistsDesign 5 Landscape Architecture111 North Tracy AvenueBozeman, MT 59715T: 406-587-4873Landscape Architect02 AUGUST 2022ADD-02Morrison-Maierle, Inc.2880 Technology Blvd.Bozeman, MT 59715T: 406-587-0721Fire Protection EngineerMorrison-Maierle, Inc.2880 Technology Blvd.Bozeman, MT 59715T: 406-587-0721Technology Engineer26 OCTOBER 2022ADD-03EXISTING DOCUMENTSTORAGE BUILDING(TO REMAIN)GENERAL NOTES:1. ALL WORK SHALL BE COMPLETED IN ACCORDANCE WITH MONTANA PUBLIC WORKS STANDARD SPECIFICATIONS (MPWSS) ANDCITY OF BOZEMAN MODIFICATIONS TO MPWSS, LATEST EDITIONS INCLUDING ALL ADDENDA2. LOCATIONS OF EXISTING OVERHEAD AND BURIED UTILITIES SHOWN ON THIS DRAWING ARE APPROXIMATE, AND SHALL BEVERIFIED AND MARKED UNDER THE DIRECTION OF THE CONTRACTOR PRIOR TO CONSTRUCTION. THE CONTRACTOR SHALLBE SOLELY RESPONSIBLE FOR ANY DAMAGE TO EXISTING UTILITIES AND SHALL REPAIR ANY FACILITIES DAMAGED DURINGPERFORMANCE OF THE WORK.3. REFER TO ARCHITECTURAL PLANS FOR ADDITIONAL SITE INFORMATION AND DETAILS.4. BEFORE WORKING IN THE PUBLIC RIGHT-OF-WAY, THE CONTRACTOR SHALL OBTAIN THE NECESSARY PERMITS, PROVIDETRAFFIC CONTROL AND SCHEDULE ROAD CLOSURES AND DETOURS, ALL IN ACCORDANCE WITH STATE AND LOCALREGULATIONS AND PERMIT REQUIREMENTS.5. SALVAGEABLE TOPSOIL SHALL BE STOCKPILED ON SITE FOR RE-USE, AT A LOCATION APPROVED BY THE OWNER.6. CONCRETE CONTRACTION JOINTS IN SIDEWALKS SHALL BE EQUALLY SPACED AT A DISTANCE EQUAL TO THE SIDEWALKWIDTH. REPLACE CONTRACTION JOINTS WITH EXPANSION JOINTS AT A 32-FOOT MAXIMUM SPACING. LARGER SLABS ORSIDEWALKS SHALL HAVE CONTRACTION JOINTS AT A MAXIMUM SPACING OF 8 FEET IN BOTH DIRECTIONS. BEFORE PLACINGANY CONCRETE, PROVIDE SCALE DRAWING OF PROPOSED EXPANSION AND CONTRACTION JOINT PATTERN FOR ARCHITECT'SAND ENGINEER'S REVIEW AND APPROVAL.1KEY NOTESTHE EXISTING COURTS ANNEX AND LAW & JUSTICE BUILDINGS WILL BE DEMOLISHED. SHUT OFF AND PERMANENTLY CAPEXISTING WATER AND SEWER SERVICES AT THE EXCAVATION LIMITS (SEE SHEETS C-002, C-101 AND C-102).TYPE 3 CONCRETE IS REQUIRED FOR ADDITIVE ALTERNATIVE NO. 1. USE TYPE 1 CONCRETE FOR THIS AREA FOR BASE BIDPRICING.THE PROPOSED 20' WIDE UTILITY EASEMENT IS REQUIRED TO REPLACE A PORTION OF THE EXISTING 20' WIDE SEWEREASEMENT THAT WILL BE RELEASED AND RE-CONVEYED WITH THIS PROJECT.PHASE 1EXISTING, TO REMAINPHASE 2EXISTING, TO REMAINPHASE 1EXISTING, TO REMAINWEST ACCESS DRIVEPHASE 1PHASE 2PHASE 1(15 PARKING SPACES)END CAP (STORM DRAIN TOSOUTH NOT IN CONTRACT)STEPS AND SITERETAINING WALLSCONNECT TOEXISTING FENCECONNECT TOEXISTING FENCEEXISTING WATER ANDSEWER SERVICES1TYPE 1 ASPHALTPAVEMENT (LIGHT DUTY)TYPE 2 ASPHALTPAVEMENT (MEDIUM DUTY)TYPE 3 ASPHALTPAVEMENT (HEAVY DUTY)TYPE 1 CONCRETE SECTION(PEDESTRIAN LOADING)TYPE 2 CONCRETE SECTION(VEHICULAR LOADING)TYPE 3 CONCRETE SECTION(HEATED EXTERIOR SLAB)EAST PONDUNDERGROUND STORAGE #1(SEE SHEET C-101)UNDERGROUND STORAGE #2(SEE SHEET C-102)WEST POND(SEE SHEET C-107)SOUTH POND(SEE SHEET C-109)EAST POND(SEE SHEET C-106)30' WIDE UTILITY EASEMENTPER 11 FILM 1514 - 10/14/1971(TO BE RELEASED AND RE-CONVEYED)30' WIDE SEWER EASEMENT.PER 129 FILM 2839 - 02/02/199330' WIDE SEWER AND WATEREASEMENT. PER CITY OF BOZEMANDOCUMENT NO. 2331663 - 05/29/200920' WIDE SEWER EASEMENT.PER CITY OF BOZEMAN DOCUMENTNO. 2331664 - 05/29/2009(TO BE RELEASED AND RE-CONVEYED)20' WIDE SEWER EASEMENT.PER CITY OF BOZEMAN DOCUMENTNO. 2332457 - 06/05/2009UTILITY EASEMENT ADJOINING TRACT ACOS 691 - PUBLIC UTILITY EASEMENT -DOCUMENT NO. 2532918 - 12/04/2015FIBER UTILITY EASEMENT -DOCUMENT NO. 2557804 - 09/09/2016PROPOSED 30' WIDEWATER MAIN EASEMENTPROPOSED 30' WIDEWATER MAIN EASEMENTUNKNOWN EASEMENT. PER 18 FILM 445 -ILLEGIBLE DOCUMENT (LINEWORKCREATED PER DOCUMENT 2331663).ADDITIVEALTERNATIVE #122EXISTINGDETENTION CENTER(TO REMAIN)EXISTING COURTS ANNEX(TO BE DEMOLISHED)EXISTING LAW ANDJUSTICE BUILDING(TO BE DEMOLISHED)PROPOSED GALLATINCOUNTY COURTS BUILDINGSEE SHEET C-002TYPE 2CONCRETESTEPS AND SITERETAINING WALLS113PROPOSED 20' WIDESEWER EASEMENT3CONSTRUCT CURB & GUTTERAROUND EXISTING MANHOLECOVER - SEE DETAIL7C-111ADD-03ADD-03ADD-03PHAS E 2 EXISTI N G, T O R E M AI NPROPERTY BOUNDRYADD-03 < CODE -OCCUPANT LOADS AND CLASSIFICATIONS SEPARATIONS. Project Number: Drawn By: Reviewed By: Approved By: Issue Date Morrison-Maierle, Inc. 2880 Technology Blvd.Bozeman, MT 59715 T: 406-587-0721 Structural Engineer Morrison-Maierle, Inc. 2880 Technology Blvd. Bozeman, MT 59715T: 406-587-0721 Mechanical Engineer Morrison-Maierle, Inc. 2880 Technology Blvd.Bozeman, MT 59715 T: 406-587-0721 Plumbing Engineer Morrison-Maierle, Inc. 2880 Technology Blvd.Bozeman, MT 59715 T: 406-587-0721 Electrical Engineer Design 5 Landscape Architecture 111 North Tracy Avenue Bozeman, MT 59715T: 406-587-4873 Landscape Architect Morrison-Maierle, Inc. 2880 Technology Blvd. Bozeman, MT 59715T: 406-587-0721 Fire Protection Engineer Morrison-Maierle, Inc. 2880 Technology Blvd. Bozeman, MT 59715T: 406-587-0721 Technology Engineer AMD JT T1 G-101 CODE PLAN - LEVEL 1 21-311 08 JULY 2022CONSTRUCTION DOCUMENTS Name Area Occupancy Classification Occupant Load Factor Occupant Load JURY A. 2195 SF A-3 1:7 N 314 CONF 425 SF A-3 1:15 N 29 CONF 172 SF A-3 1:15 N 12 CONF 172 SF A-3 1:15 N 12 CONF 172 SF A-3 1:15 N 12 CONF 172 SF A-3 1:15 N 12 COURT 1286 SF A-3 1:40 N 33 COURT 1286 SF A-3 1:40 N 33 COURT 1419 SF A-3 1:40 N 36 COURT 817 SF A-3 1:40 N 21 COURT 1420 SF A-3 1:40 N 36 COURT 1419 SF A-3 1:40 N 36 COURT 1418 SF A-3 1:40 N 36 ASSEM 522 SF A-3 1:18 " L 55 ASSEM 522 SF A-3 1:18 " L 55 ASSEM 811 SF A-3 1:18 " L 82 ASSEM 374 SF A-3 1:18 " L 33 ASSEM 810 SF A-3 1:18 " L 82 ASSEM 811 SF A-3 1:18 " L 82 ASSEM 1445 SF A-3 1:18 " L 139 ASSEM 10235 SF A-3 1:30 G 342 ASSEM 1461 SF A-3 1:30 G 49 A-3 29365 SF 1541 OFFICE 2552 SF B 1:150 G 18 OFFICE 13487 SF B 1:150 G 90 CONF 275 SF B 1:15 N 19 CONF 275 SF B 1:15 N 19 OFFICE 432 SF B 1:15 N 29 OFFICE 381 SF B 1:15 N 26 IT 189 SF B 1:300 G 1 IN-CUSTODY 305 SF B 1:150 G 3 IN-CUSTODY 305 SF B 1:150 G 3 OFFICE 425 SF B 1:15 N 29 OFFICE 4404 SF B 1:150 G 30 OFFICE 387 SF B 1:15 N 26 IN-CUSTODY 305 SF B 1:150 G 3 OFFICE 1035 SF B 1:150 G 7 OFFICE 2378 SF B 1:150 G 16 OFFICE 235 SF B 1:50 G 5 OFFICE 1119 SF B 1:150 G 8 IT/STORAGE 163 SF B 1:300 G 1 MECH/STORAGE 482 SF B 1:300 G 2 B 29133 SF 335 LEVEL 1 58498 SF 1876 STORAGE 622 SF A-3 1:300 G 3 MECHANICAL 562 SF A-3 1:300 G 2 STORAGE 622 SF A-3 1:300 G 3 STORAGE 622 SF A-3 1:300 G 3 STORAGE 468 SF A-3 1:300 G 2 STORAGE 171 SF A-3 1:300 G 1 ASSEM 2637 SF A-3 1:150 G 18 STORAGE 279 SF A-3 1:300 G 1 STORAGE Not Enclosed A-3 1:300 G A-3 5983 SF 33 MEZZANINE 5983 SF 33 Grand total 64482 SF 1909 :,//,$0$ +$1621 )2(7$760217$ 1 $ (0$1=2% 7 $1 $120 $5 &+,7(&7'(61 ( & ,/::,//,$$00000000 $$$$$$$$$$$$ ++++$$$$$$$$1166666666666222222222211111111111 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.010 Channel Slope 3.00000 % Diameter 6.00 in Discharge 19.91 gal/min Results Normal Depth 0.77 in Flow Area 0.01 ft² Wetted Perimeter 0.37 ft Hydraulic Radius 0.48 in Top Width 0.33 ft Critical Depth 0.10 ft Percent Full 12.8 % Critical Slope 0.00431 ft/ft Velocity 3.02 ft/s Velocity Head 0.14 ft Specific Energy 0.21 ft Froude Number 2.54 Maximum Discharge 1.36 ft³/s Discharge Full 1.26 ft³/s Slope Full 0.00004 ft/ft Flow Type SuperCritical GVF Input Data Downstream Depth 0.00 in Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 % Normal Depth Over Rise 12.81 % Downstream Velocity Infinity ft/s 6" PVC service at 3.00% 12/1/2022 8:21:23 AM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page OOOOOOOOOOOOOOOO OOO TP BPBPBPBPBPBPNGNGNGNGNGNGESESESESESESESESESESESESESESESNGNGNGNGNGNG/////////////////////SS SS SS SS 6SD 6SD 12 INV. (W) 23.50 18" INV. (N) = 23.00 24" INV. (S) = 24" INV .(E) = 22.50 SD MH #15 RIM EL. = 27.78 12" INV. (W) = 24.03 24" INV. (S) = 24" INV .(N) = 23.03 CURB INLET #19 (3' DIA.) TBC = 27.08 12" INV. (E) = 23.99 CURB INLET #20 (2' x 3') TBC = 27.42 12" INV. (E) = 24.29 88 L.F. - 24" SD @ 0.60%172 L.F. - 24" SD @ 0.60%112 L.F. - 6 " S S @ 3 . 0 0 % 33 L.F. - 12" SD @ 0.80% SD MH #16 (5' DIA ) 8" CLEANOUT INV. (W) = 22.92 6" CLEANOUT INV. = 20.04 6" CLEANOUT INV. (W) = 21.45 CONNECT TO EXISTING 8" SEWER MAIN 1 127 L.F. - 18"@ 5.00%55 L.F. - 8" SD @ 2.40% DRY WELL #3 RIM EL. = 28.40 8" INV. (E) = 21.60 35 L.F. - 1 2 " S D @ 1.40% @ INSPECTION PORT PIPE CROSSING: 24" SD INV. = ±22.9 6" SS INV. = ±20.3 5 ADD-02