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Carmina Wood Design Project No.: 23-4121 Date: 5/18/2026 80 Silo City Row, Suite 100 Project Name: Multifamily Development Buffalo, NY 14203 Project Address: 1475 Orchard Park Road - Town of West Seneca (716) 842-3165 Subject: Sanitary Sewage Pump Station Design FAX (716) 842-0263 Sheet: 1 of 1 Sanitary Sewage Demand Calculations: Proposed Apartments 220 gpd/unit x 25 units = 5,500 gpd Average Site Sanitary Flow: = 5,500 gpd Peak Site Sanitary Flow: = 22,000 gpd PF = 4.0 * assume flow over 18 hour period Peak Site Sanitary Flow: = 20.4 gpm 8" inlet into pump station invert: 670.68 Forcemain invert at tie into downstream sewer: 676.55 Pump chamber diameter: 5 ft ( 147 gal/ft) Storge required: * use filling time of 30 minutes @ 20.4 gpm (peak flow) Storage required = 20.4 gpm x 30 mins = 4.16 ft 147 gal Top of pump station: 682.40 Inlet & Alarm: 670.68 2 pumps on: 670.18 (inlet minus 0.5 ft) 1 pump on: 669.68 (2 pumps on minus 0.5 ft) pumps off: 665.52 (1 pump on minus storage required) Bottom of station: 664.27 (pumps off minus 1.15 ft) Total depth: 18.13 ft Cleansing velocity: Using a 3 inch forcemain, find flow for min 2 fps cleansing velocity A= 0.05 ft2 2 Q=VxA= 2 fps x 0.05 ft = 0.09817 cfs = 44.1 gpm Page 476 of 849