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Use / establishment Representative unit flow Employee (per shift) 15–20 gpd/employee Taproom / establishment guest 5–10 gpd/guest Office (Business Group B) 15–20 gpd/employee (≈ 0.10 gpd/SF) References ● Great Lakes–Upper Mississippi River Board, Recommended Standards for Wastewater Facilities (Ten State Standards). ● NYSDEC, Design Standards for Intermediate Sized Wastewater Treatment Systems (2014). ● Town of West Seneca sanitary sewer standards. ● Manning’s equation for gravity-sewer hydraulic capacity. Certification I certify that this sanitary sewer capacity analysis was prepared by me or under my direct supervision and, to the best of my knowledge, meets applicable standards. Jason Havens, P.E. — Waves AE NYS P.E. License No. 090335 Date: 07-26-26 ______________ EXP. 12-31-2026 [ P.E. SEAL ] Sanitary Sewer Capacity Analysis • 4350 Seneca Street Building Addition • Page 5 Page 48 of 84