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Home My WebLink AboutWastewaterAnalysis_042621 Valley West Sewer Trunk Line Design Capacity Summary Rev 1 (Spring Creek Village) The Ferguson Farm Subdivision - Block 5 Town & Country Foods Development Vallev West Sewer Trunk Line Design Capacity Calculation Acres person/acre gpppd Subtotal I/I/day/acre I/I Total 4.18 *** 13.3 117 6,504 gpd (Average Daily Discharge) Peaking Factor * 3.7 Daily Demand 24,067 gpd 150 627 24,694 gpd Peak Hour Demand 1003 gph 150 26 1,029 gph Town & Country Foods Water Usage Calculation (Lot FA) Average Daily Water Demand ** 4,989 gpd 208 gph Peak I-Iour Demand (4.0268 multiplier **) 837 gph I/I/day (lot FA) 516 gpd I/l/hr 22 gph Total Calculated Average Daily Wastewaster & I/1 Discharge 5,505 gpd Total Calculated Peak Hour Wastewaster & I/1 Discharge 859 gph Future Commercial Building; Water Usage Calculation (Lots 2A & 3A) Average Daily Water Demand **** 520 gpd 0NTA/yq�i�� 22 gph Peal( Hour Demand (4.42 multiplier ****) 96 gph • .'�CHR1S G. • ' BUOE9PE 1 v f I/l/day (lot 2A & 3A) III gpd _ No. t • W= I/I/hr 5 gph �'•.CFµS• �(?`�:,L Total Calculated Average Daily Wastewaster & 1/I Discharge 631 gpd 4NA0 �� Total Calculated Peak Flour Wastewaster & I/I Discharge 100 gph Summary (Lots 1A, 2A & 3A) Total Calculated Average Daily Wastewaster & I/1 Discharge 6,136 gpd Total Calculated Peak Hour Wastewaster & I/I Discharge 959 gph Estimated Wastewater from Lots 1A, 2A & 3A does not exceed the Design Capcity fo the kWIMalley West Sewer Trunk Line allocated for Block 5. * Sce "fable 8.1 Page 7 of the West Valley Sewer Trunk Line Design Report ** See attached SE Engineers Water Demand Calculations dated 4/12/21 ** Includes Lots IA, 2A & 3A of Amended Plat of Block 5 of Ferguson Farms Subdivision **** See attached Commercial Wastewater Daily Flow Analysis Estimated Wastewater Daily Flow Analysis Lots 2A & 3A Amended Plat of Block 5 Ferguson Farms Subdivision Commercial Flow: No of Units 2 Employees/unit (assumed) 4 Gallons per Capita/day 65 Average Daily Flow 520 gpd Peaking Factor Calculations Zoning Acres Units/Acre Density Total (em to ees/unit Popoulation 132 0.74 2.7 4 8.0 Q(max) = 18 + P 0.50 P =Population/thousands = 20/1000 = 0.008 Peaking Factor Q(ave) 4 +P 0.50 Peaking Factor -= 4.42 Peak Hour Sewer Demand Average Daily Flow 520 gpd 21.7 gph Peaking Factor 4.42 Peak Hour Sewer Demand 95.8 gph SANDERLIN : + EDDEN SE Engineers PO Box 10776 Bozeman, MT 59718 04/12/21 Town & Country Sewer Peak Hourly Demand The Peak Hourly Demand (PHD) is calculated as follows: • Building Average Daily Demand (gave) o Shopping Centerw/ Food Service = 130 gal / 1,000 sq.ft. (ref.- 15A NCAC 02T.0114 Wastewater Design Flow Rates - see attached) ■ Building Area = 38,378 sq.ft. ■ Qave=38,378 sq.ft. x (130 gal / 1,000 sq.ft) • Qave== 4,989 gall day • Peaking Factor (Qmax/Qave) = (18 + p112) / (4 + P/,) (ref.- Design Standards and Specifications Policy; City of Bozeman March 2004) o P = Population in thousands o P = 391 occupants (from occupancy calc. See Architectural) = 0.39 Thousand of People o Qmax = ((18 + 0.6253) / (4 + 0.6253)) x 4,989 o Qmax= 4.0268 x 4,989 o Qmax= 20,089 gal/ day SE Engineers ,�04 e�"Z-__- Bill Edden, PE Owner, Mechanical Engineer �pN T AN '. Dr: BELI rDgN• •:� 990 PF :2 •�•4ItENS'�� : .... �. ,11ONAI.kilr``• Page 1 Chris Budeski From: Shawn Kohtz <SKohtz@BOZEMAN.NET> Sent: Friday, October 30, 2020 1:20 PM To: Chris Budeski Cc: Lance Lehigh; Griffin Nielsen Subject: Valley West Trunk Line Analysis Attachments: Valley West Design Report.pdf Chris, Following up on our call earlier, please see the attached Valley West Trunk Line report. The amount of sanitary sewer capacity allocated to the T&C property per the attached report is per the following calculation. Please run the calculation and send it back for us to verify. • X acres in T&C property X 13.3 persons/acre X 117 gallons-per-person-per-day. • Convert the average day flow to peak hour flow using the peaking factor in Table 8.1 for that segment of the main, which is 3.7 • Add the 1/1 to the flow rate at 150 gallon/per/acre/day X Z acres That should give the capacity allocated to the parcel. Provide a copy of your calculation of the peak-hour flow from the T&C site plan project including 1/1. The references in the above calculation are 13.3 persons/acre is noted on Page 3 of the report. The report also notes use of a flow basis of 117 gallons-per-person-per-day noted on Page 4 of the report. Thanks, City of Bozeman ' t� v 4 G:�iSli� !�_ohtz City Engineer 406.582.2280 skohtz(d�bozeman_net City of Bozeman emails are subject to the Right to Know provisions of Montana's Constitution (Art. 11, Sect. 9) and may be considered a "public record" pursuant to Title 2, Chpt. 6, Montana Code Annotated. As such, this email, its sender and receiver, and the contents may be available for public disclosure and will be retained pursuant to the City's record retention policies. Emails that contain confidential information such as information related to individual privacy may be protected from disclosure under law. i Table 4.1 Proposed Service Area Area Served Area (Ac) Valley West Annexation • Valley West 344.5 • Billion Auto Plaza Subdivision 19.5 • Norton Ranch Inc. 40.0 Bozeman Athletic Club West Annexation 135.0 Christian Heritage School 13.0 Area North of Durston Road a Cannon/White 6.0 • Swenson 10.0 • Tom Lane 0.5 • Mengel Trust 4.0 • Hanson Trust 4.5 • Anderson/Nelson 10.0 • Metcalf 2.0 • Douglas Smith 72.0 i Douglas Smith 20.0 0 Joan Lewis/MacDonald 45.0 Total 726.0 5.0 Predicted Population Population density for this report will be based on findings detailed in the Bozeman May 1997 Wastewater Facility Plan, page 87. The plan indicates that an overall density prediction of 13.3 persons per acre should be used for new development. Valley West Sewer Trunk Line Design Report Page 3 Exceptions to the plan's recommendations are: the Christian Heritage School in which the population is known. Bronken Park in which it is assumed maximum event attendance would be 1500 people. The exclusion of the 10 acre lake being constructed in the western section of Valley West. Infiltration (1/1) allowance of 150 gallons per acre per day will be assumed corresponding to the City of Bozeman's "Wastewater Facility Plan" page 87. This is equivalent to 1.3 persons per acre of wastewater generation. (See Table 5.1) Table 5.1 Predicted Population Service Area Area (Ac) Population (111) (Person) Persons Valley West Annexation • Valley West 292.5* 3891 381 • Billion Auto Plaza Sub. 19.5 260 25 • Norton Ranch Inc. 40.0 532 52 Bozeman Athletic Club Annexation 135.0 1796 176 Area North of Durston Road 174.0 2315 227 Christian Heritage School 13 98 students 17 8 staff Total 674 Acres 8898 87811 * Less area for Bronken Park and proposed lake in western part of project. 6.0 Predicted Wastewater Generation Wastewater generation predicted in this report is based on findings detailed in the Bozeman May 1997, Wastewater Facility Plan, page 87. The plan indicates that an overall wastewater flow of 117 gpd per person should be used for new development. Wastewater generation for Bronken Park is based on 8 gpd/visitor. This information is based on Metcalf and Eddy 3"Edition, Wastewater Engineering Table 2.5,page 20. 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