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HomeMy WebLinkAbout17 - Design Report - Co-op West Main Expansion - Water, Sewer, Storm, Street CO-OP WEST MAIN EXPANSION DESIGN REPORT DECEMBER 2017 Purpose and Introduction The purpose of this report is to explain how water, sanitary sewer, and storm drainage improvements will be designed to meet the City of Bozeman requirements and Montana Public Works Standard Specifications (MPWSS) to provide service to the new expansion of the CO-OP at 920 West Main Street. The report will provide information on the detailed design of the above mentioned infrastructure as well as the geotechnical analysis and traffic generation analysis. The project is located at 920 West Main Street and is described as Lots 1, 2, west 10-ft of lot 12, and 60-ft x 180-ft west of lot 13 of Block G of Bozeman's Story Addition. It is located in the southeast quarter of Section 12, Township 2 South, Range 5 East, Gallatin County, Montana and is 0.61 acres in size. Aspen Motors was previously located on the property, but the building and associated parking lot have been demolished. The proposed improvements include the construction of a two-story building connected to the existing CO-OP building with an adjacent truck loading dock and additional parking. Design Report Water New domestic water and fire services are not proposed for the addition. The existing service sizes are adequate and will be extended to the new addition from the existing building. The mechanical engineer's water service sizing calculation is included in Appendix A. Sewer The property has one existing 4-inch sewer service extending to the 6-inch vitrified clay sewer main located south of the existing building and proposed addition. This service will continue its current use. A new 4-inch PVC sewer service will be extended to the new addition to the 6-inch sewer main. The mechanical engineer's sewer service sizing calculation is included in Appendix A. The sewer service will be installed per the City of Bozeman Design Standards and Modifications to the MPWSS. Storm Drainage The majority of the existing site was primarily hardscaped with asphalt pavement, an existing building, concrete areas, and some landscaping. The proposed site development includes a new building, a new concrete loading dock, and landscaping. Post versus pre-development runoff rates were analyzed using a 10-year storm event and the rational method. Storm drain calculations and the storm water basins exhibit are provided in Appendix B. To mitigate the increase in storm water runoff due to the additional hardscape, it is proposed to capture the storm water which falls on the roof using a "green-roof' system. This system is capable of retaining in excess of the 1 0-yr, 2-hr storm event. The system B17-041 CO-OP WEST MAIN EXPANSION Page 1 of 2 will capture the storm water and retain it on the roof. Any potential excess storm water beyond the 10-year, 2-hour event will be collected and diverted to the storm sewer main in 101h Avenue using a 6-inch SDR 35 PVC pipe. This was sized using a 25-year storm event and the rational method per the City of Bozeman design standards. Due to the finished floor elevation of the existing building, the finished floor of the proposed expansion will be lower than the street elevation in the loading dock area. The loading dock area has been graded to a low spot with a storm water catch basin. The inlet grate and piping from the catch basin to the storm water main in 10th Avenue has been sized to carry the 100-year storm. This service pipe will be an 8" SDR 35 PVC pipe and will be installed per the City of Bozeman. The roof drain will connect to this pipe on its way to the storm sewer main. Traffic Impacts The vision triangle at the intersection of Main Street and South 10th Avenue has been shown using the Montana Department of Transportation (MDT) requirements. Approval of this vision triangle has been provided by MDT and is included in Appendix C. A Traffic Study has been completed per the City of Bozeman requirements and is included in Appendix C. 1317-041 CO-OP WEST MAIN EXPANSION Page 2 of 2 APPENDIX A Mechanical (Water & Sewer) Calculations 1723 DESIGN.xlsx BOZEMAN COOP WMEX SEWER SERVICE CALCULATIONS CALCULATIONS PREPARED BY: CONSULTING DESIGN SOLUTIONS, INC CUR�TIS L. SMIT,'PE 10-9-17 2:32 PM FIXTURE SEWER TOTAL UNITS/ TOTAL LEVEL 1 NEW LEVEL 2 NEW Remodel Existing FIXTUREP FIXTURE UNITS WATER CLOSET FV 2 2 0 3 7 4 28 WATER CLOSET FT 0 0 0 0 0 3 0 LAVATORY 2 3 0 4 9 1 9 SINGLE SINK 15 1 5 1 22 2 44 DOUBLE SINK 3 0 0 1 4 2 8 SERVICE SINK 2 1 1 1 5 3 15 TRIPLE SINK 3 0 0 0 3 6 18 FLOOR SINKS 12 0 3 1 16 1 16 _ URINAL 0 0 1 1 2 2 4 SHOWERS 0 0 0 0 0 2 0 0 12 0 DRINKING FOUNT 1 0 0 1 2 0.5 1 _ FLOOR DRAIN 4 2 3 3 12 0 0 CLOTHES WASH 0 1 0 0 1 3 3 DISHWASHER 1 0 0 0 1 8 8 90.5 19 18 26.5 TOTAL UNITS 154 AREA FIX. UNITq I SIZE DATE EXISTING 26.5 4" SANITARY SEWER 10/9/2017 NEW AND REMODEL 127.5 4" SANITARY SEWER 10/9/2017 Page 1 1723 DESIGN.xlsx BOZEMAN COOP WMEX DOMESTIC WATER SERVICE CALCULATIONS FIXTURE TOTAL UNITS/ TOTAL DOMESTIC WATER LEVEL 1 NEW LEVEL 2 NEW IRemodel Existing FIXTURE FIXTURE UNITS WATER CLOSET FV 2 2 0 3 7 3.5 135 WATER CLOSET FT 0 0 0 0 0 2.5 0 LAVATORY 2 3 0 4 9 1 9 SINK 15 1 5 1 22 1.5 33 DOUBLE SINK 3 0 0 1 4 2 8 SERVICE SINK 2 1 1 1 5 3 15 TRIPLE SINK 3 0 0 0 3 8 24 FOOD SERVICE 10 0 0 0 10 0.5 5 URINAL 0 0 1 1 2 5 5 SHOWERS 0 0 0 0 0 2 0 HC HOSE BIB 0 0 0 0 0 1 0 DRINK. FOUNT 1 0 0 1 2 _ 0.5 1 CLOTHES WASH 1 0 0 0 1 4 4 DISHWASHER 1 0 0 0 1 6 6 HOSE BIB 1 2 0 1 1 4 1 5.5 831 20 16.5 27.51 TOTAL 250.5 HEIGHT= 25 MAIN PSI FIXTURE BFP METER Softener Height NET PSI MAIN PRESSURE 65 -20 0 0 0 -10.5 34.5 STR. PIPE FITTINGS 'TOTAL -- --- - - TOTAL LENGTH 240 25% FEXISTING USE 300 MAIN DOMESTIC SERVICE SIZE WATER SERVICE IS ADEQUATE PRESSURE/100' 11.50 SERVICE WITH 2"VALVES 10/9/2017 CALCULATIONS BASED ON CH 6 TABLE CH 6 282.0 FIXTURE UNITS AVAILABLE 250.5 FIXTURE UNITS USED 31.5 AVAILABLE WSFU CAPACITY Page 2 Appendix B Storm Water Calculations r MAIN STREET \04\ H \5� ... -- — ---- ---- O w so 0 10' 20' 30' S C A L E w a - o w cn E C o L p� •� C C C CC L c � U L UJ T DRAWN BY: MMO DESIGNED BY: QUALITY CHECK: DATE: 12-12-17 V JOB NO. B17-041 N FIELDBOOK V W / CA �i W o a y n x 0 � � BASIN B o _O � Z J Q Wl Q fn as m I n 00 W U � E— o Q oa O LL w _ N 3 BASIN C H °0° O CZ cn 61 r a 3 B17-041 BASE.DWG SHEET 1 of 1 X )® HYDROTECH HYDROLOGY TOOLS HMOROTECH STEP 1 of 2: ENTER THE PROJECT INFORMATION: remwed . PROJECT NAME: CO-OP W.Main Exp.(Sloped Roof) - ____ PREPARED FOR: Kyle Scarr LOCATION: Other OTHER CITY NAME: Bozeman,MT - ! '— �- I t „-- RAINFALL TYPE FROM MAP: NRCS Type II GO TO STEP 1A(BELOW MAP) (:- GARDEN ROOF°AREA: 1,1YO ISF 100% ( r f •.ar.n .S r To onufa.n-. �rrr f 'BARE'ROOF AREA: SF 0% 1 O T,, TOTAL ROOF AREA: �,�2Q NSF(0.026 ACRES) ,._ '� STEP 2 of 2: ENTER GARDEN ROOF ASSEMBLY INFORMATION: requved SALT LAKE CITY LITETOP°MEDIA (UTE-UT) MEDIA DEPTH 5.0 IINCHES GARDENDRAIN- none MOISTURE MAT NOT USED MOISTURE CAPACITY OF VEG 0.4 IINCHES F=or.se M n ou ,,fon,� ipa­,PER Pi:..;r. The moisture storage capacity of this assembly is 1.69 inches;the total storage is 157 cubic feet(1,177 gallons). Analysis A: 24-HR STORMS 24-HR STORM ANALYSIS RESULTS PREVIEW 2-YR NRCS Type II-1.20 INCH STORM Used to compute GR Curve Number,runoff volumes,flow rates.&to HYDROGRAPH size stormwater BMPs req'd by code. ---Garden Roof Runoff 'Bare'roof runoif DESIGN STORM: Bozeman,Mt rainfall —Pro Posed Roof 2-YR type: NRCS Type II 0.0 24-hr storms,inch ENTER PRECIP: 0.0 i— - - ROOF SLOPE(as percent): 50.0% 2-YR 1 1.20 1.20 FLOW PATH LENGTH: 25 FT 5-YR 1.60 1.60 ^0.0 -- - ANTECEDENT MOISTURE: 0.0 INCH 10-YR 180 1.80 S 0.0 — -- - - - ._..._ 10 25-YR 2.20 _ 2.20 0 other 100-YR 2.80 -0.0 — -- 0.0 • •' Co-Op W.Main Exp.(Sloped Roof)Roof Curve Number=63.0 0.0 0 360 720 1080 1440 Analysis B: SHORT DURATION STORMS(5 minutes-120 minutes) PEAK FLOW RESULTS PREVIEW Used to compute the'C-factor'(runoff coefficient),peak flow rate,and C-FACTOR METHOD: Calculate for eClfle storm C(composite)=0.05 to size pipes&drains. P Recommended.Chicago Stormwater Manual RECURRENCE: 'lU YEAR 0.3 ui DURATION: 120 MINUTES SEE WORKSHEET 82 FOR STORM DATA AVAILABLE FOR DENVER: I Enter user value 0 u 7 R ____ DETAILED CALC. User-provided rainfall intensity,inches/hr. 0.41 USED Ifs!CALC � 0.0 '� ConventioncGreened Roof a • •- a Roof Analysis C: ANNUAL&LONG-TERM CONTINUOUS SIMULATION LONG-TERM PERFORMANCE PREVIEW Used to compute the average annuallmonthly runoff&retention'IET CO-OP W.MAIN EXP.(SLOPED ROOF). Bozeman, for the Garden Roof Assembly. MT AVG ANNUAL PRECIP 18.1 inches EVAPOTRANSPIRATION CROP FACTOR: Reference crop-grass/turf ANNUAL RUNOFF 23% ANNUAL RETENTION' 77% • •- 71%less runoff than a'bare'roof. Refenllon=evopoliunspimi�on —American- ydro enInc. - -- _ 303 East Ohio Street Chicago, IL 60611-3387 312.337.4998 phone 312.661.0731 fax Date printed: 12/4/2017 www.hydrotechusa.com Version 3.9.4-rev.20160304 HHT-Ver.3.9.4-20160304-MASTER I� -o U LL U enO O O y? y o U O o CD m m y cy D n� o U o 0 0 o U m U > r n r 00W CO m Q J O m CO N o_0 a� O_ L O ' N C_ m r O , a) Ol m LL � v o o ° 3: 7 CD ca ¢ ~ H E rimLriLn aNi E AC t n .� U OU 000o W c N -4 C c U } m o N co LO N c .N W m (D M OR a) o Q IC) 000 o E ._ W n C Q L, O m co I- o (D O a) a) () r 00 m r I p m 0 a m U o 0 0 6 V m co co co E o w o 0 o 0 0 o n N U N C m r (D yU o '� r � oco No— u] W Ln N O rn O 0) L L N O _c o o TI'- a - m r c E o00o m > aa) m U m m m m 3 c o rn = U o 0 0 0 D a) o f o y c m y n Q m ro ocoMco m it ao n m Z a ro c o O m E m . 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Main Expansion Storm Service Pipe Sizing TD&H,, 1211212017 Engineering", T \ / 1 Input Values d = 0.67 ft = 8 in y= 0.600 ft Calculated Values (Equations from Fluid Mechanics by Chow) Theta(0) 5.00 rad 2*arccos(1-y/(d/2)) Area (A) 0.33 ft2 (1/8)*(O-sin0)d2 Wetted Perimeter(P) 1.67 ft 0.50d Hydraulic Radius (R) 0.20 ft (.25)*(1-(sinO)/O)d Top Width (T) 0.40 ft (sin 0.50)d Mannings Equation (Equation from Fundamentals of Mechanics by Munson) n = 0.013 (For PVC per COB Design Standards) So= 0.01 ft/ft Q= 1.29 cfs 1.49/n*A*R213*Sa.5 V= 3.90 ft/s RESULTS: The 100-year event produces flows of 0.62 cfs in the loading dock area and 0.62 cfs from the roof for a total of 1.24 cfs. An 8-inch pipe at 90%full has the capacity for a flow of 1.29 cfs at a 1%slope. Therefore, the 8-inch pipe is sufficient to carry the 100-year storm event from the loading dock inlet to the storm sewer main. TD&H Storm Drain Calculations Project: CO-OP W. Main Expansion I Roof Drain Pipe TD&H ' ' 1211212017 Engineering ,,,,,, J 9 ' T ' Input Values d = 0.50 ft = 6 in y= 0.375 ft Calculated Values (Equations from Fluid Mechanics by Chow) Theta (0) 4.19 rad 2*arccos(1-y/(d/2)) Area (A) 0.16 ftz (1/8)*(O-sin0)d2 Wetted Perimeter(P) 1.05 ft 0.50d Hydraulic Radius (R) 0.15 ft (.25)*(1-(sinO)/0)d Top Width (T) 0.43 ft (sin 0.50)d Mannings Equation (Equation from Fundamentals of Mechanics by Munson) n = 0.013 (For PVC per COB Design Standards) Sa= 0.1 ft/ft Q= 1.62 cfs 1.49/n'A*R213*S 0.5 V= 10.27 ft/s RESULTS: The 25-year event produces flows of 0.45 cfs from the new roof area. A 6-in pipe at 75% full has the capacity for a flow of 1.62 cfs. Therefore, the 6-inch pipe is sufficient. Appendix C MDT Vision Triangle Approval Traffic Study Kyle Scarr- RE: Co-op Vision Triangle Review From: "Riley, Jean" <jriley@mt.gov> To: Kyle Scarr<Kyle.Scarr@tdhengineering.com> Date: 9/12/2017 8:09 AM Subject: RE: Co-op Vision Triangle Review Cc: Laura Landon<laura@commaq.com>, "Demars, Kyle" <kdemars@mt.gov>, "Walsh... Kyle, MDT has reviewed the layout provided. Moving the car back is acceptable to MDT. We do have concerns with the landscaping (tree?)that is shown on the layout. The location of the landscaping is within the sight triangle. The landscaping must be in a manner as to not impact the sight triangle. I am checking on the type of landscaping that will be allowed. Jean A. Riley, P.E. Transportation Planning Engineer (406)444-9456 From: Kyle Scarr [KVIe.Scarr@tdhengineering.com] Sent: Friday, September 08, 2017 4:54 PM To: Riley, Jean<jriley@mt.gov> Cc: Laura Landon <laura@commaq.com>; Demars, Kyle<kdemars@mt.gov> Subject: RE: Co-op Vision Triangle Review Jean, We followed the MDT standard for locating the car 14.4 feet from the travel way. We noticed as well that would interact with the cross walk so we moved the car back leaving a 6.0-foot plus clear path in front of the car and checked it in-house, see attached. It looks as though we should be able to accommodate traffic and pedestrians. Thanks, Kyle Kyle Scarr, P.E. I Regional Manager TD&H Engineering 234 E. Babcock Street, Suite 3 1 Bozeman, MT 59715 p: 406.586.0277 1 c:406.461.8465 1 d:406.602.4067 www.tdhengineering.com >>> "Riley, Jean" <iriley@mt.gov> 9/8/2017 3:12 PM >>> Kyle, I did a quick review of the vision triangle exhibit. Can you provide the cross walk layout, with the stop bar. It appears the vehicle would need to encroach into the cross walk for the design you provided. This could result in conflict with the vehicles and the pedestrians. Thanks Jean A. Riley, P.E. Transportation Planning Engineer (406)444-9456 Success depends upon previous preparation, and without such preparation there is sure to be failure. -- Confucius From: Demars, Kyle Sent: Friday,September 08, 2017 11:37 AM To: Riley,Jean <iriley(cDmt.gov> Subject: FW: Co-op Vision Triangle Review From: Kyle Scarr [mailto:Kyle.Scarr@tdhengineering.com] Sent:Tuesday,September 05, 2017 9:01 PM To: Demars, Kyle<kdemars(@mt.gov> Cc: Laura Landon <laura@commag.com> Subject: Co-op Vision Triangle Review Kyle, Per our conversation last week,I have attached our vision triangle determination for the proposed Co-op expansion at South 10th and West Main in Bozeman, Montana. As part of our conceptual submittal to the City of Bozeman, we requested that the project use the MDT vision triangle determination. This was determined acceptable provided we obtain approval from MDT. We have based the vision triangle on a 25 mph speed which is the signed speed limit in front of the co-op. Shown on the exhibit are all three triangles for westbound traffic in the nearest lane. The northern lane of westbound traffic is more conservative so only one triangle is shown for clarity and to show it is not the controlling lane. Being the building would only affect the vision of cars stopped on South loth looking east, only this view was analyzed. Please let me know if you need anything additional for your review. Thanks, Kyle Kyle Scarr, P.E. I Regional Manager TD&H Engineering 234 E. Babcock Street, Suite 3 1 Bozeman, MT 59715 p:406.586.0277 1 c:406.461.8465 1 d: 406.602.4067 www.tdhengineering.com 20.00' 1, EDGE I I I y S.10TH AVE. 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