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West Seneca Sewer Report | Page 3 Project Data: Facility Type: Affordable Housing No. of Buildings: 2 (Including one existing) Section 3 – Proposed Facilities Stormwater Storm and sanitary are separate systems within the project site. Building Utility Services – Sanitary The following summarizes the sanitary sewer service sizes for each building. Table 1: Sanitary Lateral Sizes Sanitary Lateral Building # Description Size Existing Mansion 1 6” 2 Proposed Building 6” Sanitary Sewer The project requires a Down Stream Sewer Capacity analysis (DSCA) to conform with NYSDEC regulations considering proposed sanitary flows are intended to convey a flow greater than 2,500 gallons per day. In accordance with Erie County policy a downstream, dry weather sanitary capacity analysis is included. The monitoring report is included in the appendices. Based on the flow depth measurements recorded the following conclusions are reached: • At no time did the flow depth exceed pipe diameter at any of the downstream monitoring points during the wet weather events monitored. • One time during the monitoring period the depth of flow exceeded the diameter of the pipe. DSCA Summary: Erie County provided three (3) nodes, described below: Flow Monitoring Period: August 13, 2024, to September 18, 2024 Page 18 of 110