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1. Purpose and Scope This analysis evaluates the capacity of the existing 4″ sanitary sewer service connection and the receiving 15″ public sewer main relative to the sanitary demand of the facility at 4350 Seneca Street, in support of site plan review before the Town of West Seneca Planning Board. Sanitary demand is based on occupant load. Because the proposed addition does not change occupant loads or facility operations, the analysis confirms that the existing service and main remain adequate. Stormwater is addressed separately in the project plans and is outside this scope. 2. Existing Conditions The site is improved with an existing 3,000 SF building operating with 4 employees and an average of 65 guests per day. Sanitary service is provided by an existing 4″ PVC service connection at Seneca Street discharging to the Town of West Seneca 15″ public sewer main, which currently conveys the facility’s flow without issue. Existing parameter Basis Quantity Building area Gross floor area 3,000 SF Staff Employees 4 Patrons Guests per day (avg) 65 3. Proposed Conditions The project maintains the existing structure and constructs a new two-story addition over and adjacent to it: 1,902 SF of first-floor operations space (Commercial) and 2,500 SF of second-floor office and storage (Business Group B). Total building area becomes 7,402 SF. The addition provides additional space for safer operations — greater clearance between equipment, a larger footprint for newer advanced equipment, and indoor storage of materials and equipment — together with proper meeting and office space for existing staff, who currently use the taproom. It does not add occupant load: staffing and guest counts remain the same, and the facility’s operations are unchanged (and if anything reduced with newer equipment). Sanitary demand is therefore unchanged from existing conditions. Component Use / classification Area Existing structure (retained) Existing establishment 3,000 SF Addition — 1st floor Operations space (Commercial) 1,902 SF Addition — 2nd floor Office / storage (Group B) 2,500 SF Sanitary Sewer Capacity Analysis • 4350 Seneca Street Building Addition • Page 2 Page 45 of 84