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CARMINA WOOD DESIGN Project No.: 22.128 Date: 10/3/2022 487 MAIN STREET, SUITE 500 Project Name: Residential Apartments BUFFALO, NEW YORK, 14203 Project Address: 1130 Orchard Park Road West Seneca, NY (716) 842-3165 Subject: Sanitary Sewer Demand Calcs FAX (716) 842-0263 Sheet: 1 of 1 Sanitary Sewage Demand Calculations: Proposed Apartments 220 gal/d/unit x 45 units = 9,900 gpd *use 220 gallons per unit per day (2-bdrm) Total Site Sanitary Demand: = 9,900 gpd Find Peak Sanitary Demand: Peaking Factor based on Population: Total demand: 9,900 gpd / 100 gpcd = 99 per capita Population (P) = 99 people Peaking Factor : (18 +ÖP) / (4 + ÖP ) where P is in thousands Peaking Factor = 4.24 Peak Sanitary Demand = 9,900 x 4.24 = 42,023 gpd = 0.042 MGD = 0.065 cfs Required Infiltration and Inflow Mitigation: Peak Sanitary Flow = 42,023 gpd = 29.18 gpm 4:1 offset flow per NYSDEC requirements = 29.18 x 4 = 116.73 gpm req'd Mitigation Credit = 30 gpm / lateral Laterals to be replaced* = 3.9 laterals = 4 laterals *(or other mitigation as identified by the Town) From DSCA for Multi-family project at 1130 Orchard Park Road Page 488 of 849