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CARMINA WOOD DESIGN Project No.: 24-4113 Date: 7/13/2026 80 SILO CITY ROW, SUITE 100 Project Name: West Seneca Exchange BUFFALO, NEW YORK, 14203 Project Address: Orchard Park Rd West Seneca, NY (716) 842-3165 Subject: Sanitary Sewer & Water Demand Calcs FAX (716) 842-0263 Sheet: 1 of 3 Sanitary Sewage Demand Calculations: 0.1 gal/d/sf x 241,000 sf = 24,100 gpd *use 0.1 gallons per sq. ft. per day (shopping center) 500 gal/d/wind. x 4 wind. = 2,000 gpd *use 500 gallons per drive thru window per day 25 gal/d/seat x 222 seats = 5,550 gpd *use 25 gallons per seat per day (fast food) 0.1 gal/d/sf x 120,025 sf = 12,003 gpd *use 0.1 gallons per sq. ft. per day (retail) 15.0 gal/d/Employ. x 5 Employ. = 75 gpd *use 0.1 gallons per sq. ft. per day (retail) 35 gal/d/seat x 500 seats = 17,500 gpd *use 25 gallons per seat per day (Ordinary Restraunt) Total Site Sanitary Demand: = 61,228 gpd * The hydraulic loading rate is per “Design Standards for Intermediate Sized Wastewater Treatment Systems” 2014, NYSDEC Find Peak Sanitary Demand: Peaking Factor based on Population: Total demand: 61,228 gpd / 100 gpcd = 612 per capita Population (P) = 612 people Peaking Factor : (18 +√P) / (4 + √P ) where P is in thousands Peaking Factor = 3.93 Peak Sanitary Demand = 61,228 x 3.93 = 240,462 gpd = 0.240 MGD = 0.372 cfs Peak Sanitary Flow = 240,462 gpd = 167.0 gpm 4:1 offset flow per NYSDEC requirements = 167.0 x 4 = 667.9 gpm req'd Required Infiltration and Inflow Mitigation: Mitigation Credit = $2.40 / gpd of average daily demand Mitigation Agreement Amount = $146,946.00 Page 680 of 1174