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Multifamily Development 1425 & 1475 Orchard Park Road West Seneca, NY 14224 Page 1 of 4 5/26/2026 Section 1 – Location & Description This new development project involves the construction of three (3) 4-unit, one (1) 5-unit and two (2) 6- unit ranch style townhomes, for a total of 29 units. Construction will also consist of associated parking, storm water management, utility, lighting, and landscaping improvements. The site is currently vacant consisting of grass, brush and tree cover. The total area of the site is 16.59 acres with an area of disturbance of approximately 7.37 acres. The site has been rezoned to C-1(S) to allow for the development. See Appendix A for Site Location Map. Section 2 – Water System The proposed 6” combined water service will connect to an existing 8” PVC water main located on the west side of Orchard Park Road. The proposed service will tap the main and enter a heated enclosure where an RPZ and meter will be provided. The combined service will enter the buildings and reduce to a 2” domestic service. Two (2) private fire hydrants are proposed to provide fire protection. Drainage from the hotbox due to testing or failure will be via gravity to the nearest drainage inlet. Water inside the building will be used for typical bathroom and janitorial uses. Domestic Summary: Peak Operating Demand: 87 gpm Water Main: 8” PVC water main along Orchard Park Road Static Pressure: 70 psi Friction Loss: 0.2 psi Elevation Loss: -2.0 psi Meter & RPZ Loss: 13 psi Pressure at furthest unit: 58.8 psi Fire Summary: Peak Operating Demand: 1,000 gpm Water Main: 8” PVC water main along Orchard Park Road Static Pressure: 70 psi Friction Loss: 12.6 psi Elevation Loss: -2.0 psi Meter & RPZ Loss: 13 psi Pressure at furthest hydrant: 46.4 psi Repairs to all devices will be made during off hours; dual backflow preventers are not required. The site is not located in a 100-year flood plain. Disinfection of the water service following installation will be continuous feed, according to AWWA C-651, latest revision. See Appendix B for Sanitary Sewer & Water Calculations. Section 3 – Sanitary Sewer Service The proposed sanitary sewer service will connect to an existing manhole located along the west side of Orchard Park Road. The proposed service will consist of approximately 691 LF of 8” SDR-35 PVC private sanitary sewer main at a slope of 0.4%, 346 LF of 6” SDR-35 PVC sanitary sewer lateral at a minimum slope of 1.0% and 285 LF of 3” SDR-21 PVC force main with a minimum cover of 4’. Page 468 of 849