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West Seneca Sewer Report | Page 4 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:(25 units) x (1 bdrm/unit)x 110gpd/bdrm=2,750 gpd Two Bdrm Units:(25 units) x (2 bdrm/unit)x110gpd/bdrm=5,500 gpd Three Bdrm Units:(25 units) x (3 bdrm/unit)x110gpd/bdrm=8,250 gpd Office Space: 4 Employees x 15 gpd = 60 gpd Total = 16,560 gpd Peak Hourly Flow (Sanitary): 16,560 gpd x Peak Factor Total Population=[(25x1)+(25x2)+(25x3)]x2 people per bedroom= =150x2= 300People (assume 2 people per bedroom)+4 office employees=304. P = 0.304 (in thousands) Peaking Factor = (18 + √P) / (4+√P) = (18+0.5514)/(4+0.5514)=4.08 Peak Sanitary Demand =16,560x 4.08 = 67,565 gpd 0.06800 MGD (0.10 CFS) Sanitary Demand Calculations: Node 1 – Average 16,560 gpd (0.017 MGD) Entire Site: 110-gal/d/unit x 1bdrmx25 units=2,750 gpd + 110-gal/d/unit x 2bdrmx25 units=5,500 gpd +110-gal/d/unitx3bdrmx25 units=8,250 gpd 4 employees x 15 gpd=60 gpd Site total= 16,560 gpd Ave. Total = 16,560 gpd (0.017 MGD) Assume 2 people per bedroom. 2 x 150 bedrooms = 300 people + 4 office employees = 304 people. P = 0.304 (in thousands) Peaking Factor = (18 + √P) / (4+√P) = 4.08 Peak Sanitary Demand = 16,560 x 4.08 = 67,565 gpd Page 19 of 110