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Home My WebLink AboutWater and Sanitary Sewer Design Report INTRODUCTION This project includes the proposed re-development of a portion of the existing Gallatin Valley Mall property. The re-development includes the demolition and re-development of a portion of the existing Gallatin Valley Mall and construction of four (4) new commercial buildings. A large portion of the existing parking lot will also be re-developed to add landscape and sidewalk islands, and re-align the parking stalls. The property is located within the Bozeman city limits and is currently zoned B-2 commercial. This project is located in the City of Bozeman’s South Pressure Zone (HGL 5125). As part of the project, a portion of the existing 8” water and sanitary sewer mains will be extended to serve the four (4) new commercial buildings located within the Phase 2 area. An existing 8” water main runs east-west through the property along the south side of the existing Gallatin Valley Mall building and will be extended southward into Phase 2. Similarly, an existing 6” sanitary sewer main runs east-west through the property along the northern boundary line and a new 8” sanitary sewer main will be extended southward into Phase 2 from there. The proposed water and sanitary sewer main extensions are shown on civil sheet C2.1. It is understood that a future infrastructure plan set and associated design report will be prepared and submitted for review and approval by both the City of Bozeman and the DEQ. This report is indented to outline the water and sanitary sewer demands for the purposes of the initial site plan submittal. Water Distribution System Demands The design parameters used herein are according to the City of Bozeman Design Standards and Specifications Policy (DSSP) dated May 2017. The water demands for the proposed water main extension were conservatively determined by the mechanical engineer (Morrison-Maierle) based on the fixture units. The 300 proposed fixture units are expected to generate an average day demand of 110 gpm. The fixture count summary and associated demand are included within Appendix A. Average Day Demand (Peaking Factor = 1.0) Maximum Day Demand (Peaking Factor = 2.3) Peak Hour Demand (Peaking Factor = 3.0) Water Demands (300 fixture units) Average Day Demand = 110 gpm Maximum Day Demand = 110 gpm x 2.3 = 253 gpm Peak Hour Demand = 110 gpm x 3.0 = 330 gpm Sanitary Sewer Design Load The design parameters used herein are based on the DEQ Circular 4, specifically section 3.1, table 3.1-1. An average daily flow rate of 10 gpd per employee, 3 gpd per customer and 3 gpd per meal was used. The existing mall is occupied by approximately 120 employees while the new businesses associated with the redevelopment are estimated to produce approximately 80 new employees. As such, a total of 200 employee is used for the demand analysis. The number is proposed customers is based on the foot traffic analytics survey conducted by Placer Labs, Inc. at the Gallatin Valley Mall for the 2021 calendar year. In summary, there were 1.5 million visits that year, which is approximately 4,110 visits per day. The existing mall is about 300,000 square feet in size and results in a rate of 0.0137 visits per square foot. Approximately 50,000 square feet of retail space will be added as part of the redevelopment resulting in a total square footage of 350,000 square feet. Therefore, a total of 4,800 visitors per day is assumed. The restaurant area is anticipated to serve 500 meals per day. Projected Sewer Flows: (200 employees)(10 gal/day/person) = 2,000 gpd (4,800 visitors per day)(3 gal/day/person) = 14,400 gpd (500 meals per day)(3 gal/day/meal) = 1,500 gpd Infiltration (37.42 acres)(150 gal/day/acre) = 5613 gpd Total QAvg. = 23,513 gpd = 16.33 gpm = 0.036 cfs Peaking Factor: 𝑃𝑚𝑎𝑥 𝑃𝐴𝑣𝑔 =18+𝑃.5 4+𝑃.5 ,(P =Pop./thousands),=18+(4.11).5 4+(4.11).5 =3.32 Peak Flow = (3.32) x 0.036 cfs = 0.121 cfs Sanitary Sewer Hydraulic Analysis: The capacity of an 8-inch main is checked using Manning’s Equation: Q = (1.486/n)AR2/3S1/2 For an 8-inch PVC sewer main: Manning's n = 0.013 for PVC Minimum Slope = 0.004 ft/ft (~0.01 ft/ft is proposed) A = area = (3.14/4)d 2 = (3.14/4)(8/12)2 = 0.34907 ft2 P = perimeter = 2(3.14)r = 2(3.14)(4/12) = 2.0944 ft R = hydraulic radius = A/P = 0.34907/2.0944 = 0.16667 ft R2/3 = 0.30105 ft S = 0.004 ft/ft S1/2 = 0.0632 ft/ft Qfull = (1.486/0.013)(0.34907)(0.30105)(0.0632) = 0.7592 cfs Q0.75 = (0.75)(0.7592) = 0.5694 cfs > Qpeak = 0.121 cfs ∴ adequate Conclusion In conclusion, the 8-inch sanitary sewer main provides adequate capacity to service the proposed development. G:\C&H\21\211237\Design Reports\Sewer\211237 Water And Sanitary Sewer Design Report.Docx APPENDIX A FIXTURE COUNT SUMMARY THESE DOCUMENTS, IN PART OR IN WHOLE, AND THEDESIGN THEY REPRESENT ARE THE SOLE PROPERTYOF COLLABORATIVE DESIGN ARCHITECTS. THESEDOCUMENTS ARE INTENDED FOR THE PROJECT ONTHE SITE INDICATED. ANY USE, REPRODUCTION,MODIFICATION OR ADAPTATION WITHOUT THEEXPRESS WRITTEN CONSENT OF COLLABORATIVEDESIGN ARCHITECTS IS STRICTLY PROHIBITED.2280 GRANT ROAD, SUITE C BILLINGS, MT 59102 406.248.3443PREPARED FOR:PROJECT NUMBER:PROJECT ARCHITECT: GVM BUILDING SHELL 2825 WEST MAIN STREET, BOZEMAN MT 59715 GALLATIN MALL GROUP LLC JEFF KANNING 2206.1 C O L L A B O R A T I V ED E S I G N A R C HITE CTSISSUE DATES:2206.1-GVM BUILDING SHELLCOPYRIGHT C 2022 www.cd-mt.comSTAMP 406.656.6000 315 N. 25th Street, Suite 102, Billings, MT 59101 www.m-m.net#IssueDate #RevID - - -A SCTEIR C H T 4/1/2022 - PERMIT DRAWINGS MP003 MECHANICAL AND PLUMBING FIXTURE UNIT SCHEDULESMMI Project #: 2581.999 10/28/2022 - FOR CONSTRUCTION SET FOR CONSTRUCTION SET NOTES: PROVIDE ALL FIXTURES WITH APPROPRIATE COMMERCIAL GRADE SUPPORTS/CARRIERS, P-TRAPS, STOP VALVLES, BRAIDED FLEXIBLE SUPPLIES, UNDER FIXTURE PIPING INSULATION AND HAMMER ARRESTORS. PROVIDE AND INSTALL TRAP PRIMERS FOR ALL FLOOR DRAINS AND FLOOR SINKS UNLESS OTHERWISE INDICATED. INSTALL ALL TRAP PRIMERS IN RECESSED WALL MOUNTED BOXES IN AN ACCESSIBLE LOCATION. FIELD COORDINATE INSTALLATION LOCATION OF TRAP PRIMER WALL BOXES, WATER CLOSETS, LAVATORIES, AND URINALS FOR ADA COMPLIANCY WITH ARCHITECT/ENGINEER. TOTALS 22.5 41.5 13.9 WC WATER CLOSET, 1.6 GPF FLUSH VALVE 4.0 5.0 - 3 15.0 - UR URINAL, 1.0 GPF 2.0 4.0 - 1 2.0 4.0 - MS SERVICE SINK OR MOP BASIN 3.0 3.0 2.25 1 3.0 3.0 2.25 L LAVATORY 1.0 1.0 0.75 4 4.0 4.0 3.00 LS LAUNDRY SINK 2.0 1.5 1.13 1 2.0 1.5 1.13 S KITCHEN SINK, DOMESTIC 2.0 1.5 1.13 2 4.0 3.0 2.26 HB HOSE BIBB, EACH ADDITIONAL - 1.0 - 1 - 1.0 - HB HOSE BIBB - 2.5 - 1 - 2.5 - DF DRINKING FOUNTAINS 0.5 0.5 - 1 0.5 0.5 - DW DISHWASHER, DOMESTIC 2.0 1.5 1.13 2 4.0 3.0 2.26 CW CLOTHESWASHER, DOMESTIC 3.0 4.0 3.00 1 3.0 4.0 3.00 WFU CWFU HWFU MARK DESCRIPTION WFU CWFU HWFU COUNT SUBTOTALS GVM FOOD COURT FIXTURE UNIT SCHEDULE NOTES: PROVIDE ALL FIXTURES WITH APPROPRIATE COMMERCIAL GRADE SUPPORTS/CARRIERS, P-TRAPS, STOP VALVLES, BRAIDED FLEXIBLE SUPPLIES, UNDER FIXTURE PIPING INSULATION AND HAMMER ARRESTORS. PROVIDE AND INSTALL TRAP PRIMERS FOR ALL FLOOR DRAINS AND FLOOR SINKS UNLESS OTHERWISE INDICATED. INSTALL ALL TRAP PRIMERS IN RECESSED WALL MOUNTED BOXES IN AN ACCESSIBLE LOCATION. FIELD COORDINATE INSTALLATION LOCATION OF TRAP PRIMER WALL BOXES, WATER CLOSETS, LAVATORIES, AND URINALS FOR ADA COMPLIANCY WITH ARCHITECT/ENGINEER. TOTALS 61.5 72.6 9.4 WC WATER CLOSET, 1.6 GPF GRAVITY FLUSH VALVE 4.0 5.0 - 8 32.0 40.0 UR URINAL, 1.0 GPF 4.0 4.0 - 4 16 16.0 MS SERVICE SINK OR MOP BASIN 3.0 3.0 2.25 1 3.0 3.0 2.25 L LAVATORY 1.0 1.0 0.75 8 8.0 8.0 6.00 S KITCHEN SINK, DOMESTIC 2.0 1.5 1.13 1 2.0 1.5 1.13 HB HOSE BIBB, EACH ADDITIONAL - 1.0 - 1 - 1.0 - HB HOSE BIBB - 2.5 - 1 - 2.5 - DF DRINKING FOUNTAINS 0.5 0.5 - 1 0.5 0.5 - WFU CWFU HWFU MARK DESCRIPTION WFU CWFU HWFU COUNT SUBTOTALS PAD C FIXTURE UNIT SCHEDULE NOTES: PROVIDE ALL FIXTURES WITH APPROPRIATE COMMERCIAL GRADE SUPPORTS/CARRIERS, P-TRAPS, STOP VALVLES, BRAIDED FLEXIBLE SUPPLIES, UNDER FIXTURE PIPING INSULATION AND HAMMER ARRESTORS. PROVIDE AND INSTALL TRAP PRIMERS FOR ALL FLOOR DRAINS AND FLOOR SINKS UNLESS OTHERWISE INDICATED. INSTALL ALL TRAP PRIMERS IN RECESSED WALL MOUNTED BOXES IN AN ACCESSIBLE LOCATION. FIELD COORDINATE INSTALLATION LOCATION OF TRAP PRIMER WALL BOXES, WATER CLOSETS, LAVATORIES, AND URINALS FOR ADA COMPLIANCY WITH ARCHITECT/ENGINEER. TOTALS 53.5 72.5 9.4 WC WATER CLOSET, 1.6 GPF FLUSH VALVE 4.0 5.0 - 8 32.0 40.0 - UR URINAL, 1.0 GPF 2.0 4.0 - 4 8.0 16.0 - MS SERVICE SINK OR MOP BASIN 3.0 3.0 2.25 1 3.0 3.0 2.25 L LAVATORY 1.0 1.0 0.75 8 8.0 8.0 6.0 S KITCHEN SINK, DOMESTIC 2.0 1.5 1.13 1 2.0 1.5 1.13 HB HOSE BIBB, EACH ADDITIONAL - 1.0 - 1 - 1.0 - HB HOSE BIBB - 2.5 - 1 - 2.5 - DF DRINKING FOUNTAINS 0.5 0.5 - 1 0.5 0.5 - WFU CWFU HWFU MARK DESCRIPTION WFU CWFU HWFU COUNT SUBTOTALS PAD D FIXTURE UNIT SCHEDULE NOTES: PROVIDE ALL FIXTURES WITH APPROPRIATE COMMERCIAL GRADE SUPPORTS/CARRIERS, P-TRAPS, STOP VALVLES, BRAIDED FLEXIBLE SUPPLIES, UNDER FIXTURE PIPING INSULATION AND HAMMER ARRESTORS. PROVIDE AND INSTALL TRAP PRIMERS FOR ALL FLOOR DRAINS AND FLOOR SINKS UNLESS OTHERWISE INDICATED. INSTALL ALL TRAP PRIMERS IN RECESSED WALL MOUNTED BOXES IN AN ACCESSIBLE LOCATION. FIELD COORDINATE INSTALLATION LOCATION OF TRAP PRIMER WALL BOXES, WATER CLOSETS, LAVATORIES, AND URINALS FOR ADA COMPLIANCY WITH ARCHITECT/ENGINEER. TOTALS 38.5 53.5 5.6 WC WATER CLOSET, 1.6 GPF FLUSH VALVE 4.0 5.0 - 6 24.0 30.0 - UR URINAL, 1.0 GPF 2.0 4.0 - 3 6.0 12.0 - MS SERVICE SINK OR MOP BASIN 3.0 3.0 2.25 1 3.0 3.0 2.25 L LAVATORY 1.0 1.0 0.75 3 3.0 3.0 2.00 S KITCHEN SINK, DOMESTIC 2.0 1.5 1.13 1 2.0 1.5 1.13 HB HOSE BIBB, EACH ADDITIONAL - 1.0 - 1 - 1.0 - HB HOSE BIBB - 2.5 - 1 - 2.5 - DF DRINKING FOUNTAINS 0.5 0.5 - 1 0.5 0.5 - WFU CWFU HWFU MARK DESCRIPTION WFU CWFU HWFU COUNT SUBTOTALS PAD E FIXTURE UNIT SCHEDULE NOTES: PROVIDE ALL FIXTURES WITH APPROPRIATE COMMERCIAL GRADE SUPPORTS/CARRIERS, P-TRAPS, STOP VALVLES, BRAIDED FLEXIBLE SUPPLIES, UNDER FIXTURE PIPING INSULATION AND HAMMER ARRESTORS. PROVIDE AND INSTALL TRAP PRIMERS FOR ALL FLOOR DRAINS AND FLOOR SINKS UNLESS OTHERWISE INDICATED. INSTALL ALL TRAP PRIMERS IN RECESSED WALL MOUNTED BOXES IN AN ACCESSIBLE LOCATION. FIELD COORDINATE INSTALLATION LOCATION OF TRAP PRIMER WALL BOXES, WATER CLOSETS, LAVATORIES, AND URINALS FOR ADA COMPLIANCY WITH ARCHITECT/ENGINEER. TOTALS 29.5 31.5 6.4 WC WATER CLOSET, 1.6 GPF FLUSH VALVE 4.0 5.0 - 3 12.0 15.0 - UR URINAL, 1.0 GPF 2.0 4.0 - 4 8.0 4.0 - MS SERVICE SINK OR MOP BASIN 3.0 3.0 2.25 1 3.0 3.0 2.25 L LAVATORY 1.0 1.0 0.75 4 4.0 4.0 3.00 S KITCHEN SINK, DOMESTIC 2.0 1.5 1.13 1 2.0 1.5 1.13 HB HOSE BIBB, EACH ADDITIONAL - 1.0 - 1 - 1.0 - HB HOSE BIBB - 2.5 - 1 - 2.5 - DF DRINKING FOUNTAINS 0.5 0.5 - 1 0.5 0.5 - WFU CWFU HWFU MARK DESCRIPTION WFU CWFU HWFU COUNT SUBTOTALS PAD F FIXTURE UNIT SCHEDULE NOTES: PROVIDE ALL FIXTURES WITH APPROPRIATE COMMERCIAL GRADE SUPPORTS/CARRIERS, P-TRAPS, STOP VALVLES, BRAIDED FLEXIBLE SUPPLIES, UNDER FIXTURE PIPING INSULATION AND HAMMER ARRESTORS. PROVIDE AND INSTALL TRAP PRIMERS FOR ALL FLOOR DRAINS AND FLOOR SINKS UNLESS OTHERWISE INDICATED. INSTALL ALL TRAP PRIMERS IN RECESSED WALL MOUNTED BOXES IN AN ACCESSIBLE LOCATION. FIELD COORDINATE INSTALLATION LOCATION OF TRAP PRIMER WALL BOXES, WATER CLOSETS, LAVATORIES, AND URINALS FOR ADA COMPLIANCY WITH ARCHITECT/ENGINEER. TOTALS 203.5 265.5 44.6 WC WATER CLOSET, 1.6 GPF FLUSH VALVE 4.0 5.0 - 28 112.0 140.0 - UR URINAL, 1.0 GPF 2.0 4.0 - 13 26.0 52.0 - MS SERVICE SINK OR MOP BASIN 3.0 3.0 2.25 5 15.0 15.0 11.25 L LAVATORY 1.0 1.0 0.75 27 27.0 27.0 20.25 LS LAUNDRY SINK 2.0 1.5 1.13 1 2.0 1.5 1.13 S KITCHEN SINK, DOMESTIC 2.0 1.5 1.13 6 12.0 9.0 6.78 HB HOSE BIBB, EACH ADDITIONAL - 1.0 - 9 - 9.0 - HB HOSE BIBB - 2.5 - 1 - 2.5 - DF DRINKING FOUNTAINS 0.5 0.5 - 5 2.5 2.5 - DW DISHWASHER, DOMESTIC 2.0 1.5 1.13 2 4.0 3.0 2.26 CW CLOTHESWASHER, DOMESTIC 3.0 4.0 3.00 1 3.0 4.0 3.00 WFU CWFU HWFU MARK DESCRIPTION WFU CWFU HWFU COUNT SUBTOTALS TOTAL FIXTURE UNIT SCHEDULE IS SEFORP LANO E N G INEERO N TM ANA LICENS E D RYAN T. THOMSON No. 15757 PE