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West Seneca Sewer Report | Page 3 Table 1: Sanitary Lateral Sizes Sanitary Lateral Building # Description Size 1 Existing Mansion 6” 2 Proposed Building 6” 3.2 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. 3.3 DSCA Summary Erie County provided three (3) nodes, described below: • Flow Monitoring Period: August 13, 2024, to September 18, 2024 • Dry Week Days Monitored: Aug 13-15, Aug 20-23, Aug 26-30, Sept 2-5, Sept 10-13, and Sept 16-18. • Dry Weekend Days Monitored: Aug 24-25, Sept 8, and Sept 14-15. Nodes (manholes): • Node 1 MH BAA8A – 48” RCP (Matthews Cemetery NW Corner) • Node 2 MH BAA9A – 60” RCP (Casimer Street) • Node 3 MH BAAA8 – 66” RCP (8 Cable Street) Design Parameters: Hydraulic Loading rates per NYS Design Standards for Intermediate Wastewater Treatment Systems, March 5, 2014. Calculations included below: Apartments – Bedroom Units = 110 gpd/unit Office Space= 15 gpd / employee Average Daily Design Flow: One Bdrm Units:(24 units) x (1 bdrm/unit)x 110gpd/bdrm=2,640 gpd Two Bdrm Units:(29 units) x (2 bdrm/unit)x110gpd/bdrm=6,380 gpd Page 78 of 1493