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CARMINA WOOD DESIGN Project No.: 23-4121 Date: 12/11/2023 487 MAIN STREET, SUITE 500 Project Name: Proposed Apartment Development BUFFALO, NEW YORK, 14203 Project Address: 1425 Orchard Park Road (716) 842-3165 Subject: I & I Mitigation FAX (716) 842-0263 Sheet: 1 of 1 Sanitary Sewage Demand Calculations: Proposed Development 220 gal/d/unit x 26 units = 5,720 gpd *use 220 gal/d/unit (2-bdrm apt) 330 gal/d/unit x 4 units = 1,320 gpd *use 330 gal/d/unit (3-bdrm apt) Total Site Sanitary Demand: = 7,040 gpd Find Peak Sanitary Demand: Peaking Factor based on Population: Total demand: 7,040 gpd / 52 gpcd = 135 per capita Population (P) = 135 people Peaking Factor : (18 +√P) / (4 + √P ) where P is in thousands Peaking Factor = 4.21 Peak Sanitary Demand = 7,040 x 4.21 = 29,604 gpd = 0.030 MGD = 0.046 cfs Required Infiltration and Inflow Mitigation: Total Sanitary Flow = 7,040 gpd Mitigation Credit = $1.20 / gpm (Town of West Seneca) Mitigation Agreement Amount = $8,448.00 Page 487 of 849