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Section 1 - Location & Description This project consists of the first phase of the redevelopment of the approximately 56 acre former Seneca Mall property, located within the area bounded by Slade Avenue, Ridge Road, and Orchard Park Road in the Town of West Seneca. The proposed redevelopment includes construction of an approximately 158,000 square foot commercial building to be occupied by Costco Wholesale, along with associated parking, utilities, stormwater management facilities, and other supporting site improvements. This phase also includes the primary infrastructure necessary to accommodate future phases and the ultimate full build out of the redevelopment site. Proposed site improvements include upgrades to the existing utility infrastructure, construction of a new internal roadway network, parking facilities, site lighting, landscaping, and stormwater management system designed for the full build out. These improvements are intended to provide the framework required for future development throughout the remainder of the property. The project site is currently occupied by the remnants of the former Seneca Mall and the existing Tops Market grocery store. The Tops Market will remain operational throughout construction and will not be impacted by the proposed redevelopment. Construction activities associated with the redevelopment are expected to result in approximately 27.71 acres of land disturbance. Section 2 - Water Service Water service for the proposed Seneca Mall redevelopment will be provided by a new private 8-inch combined water service main connected to an existing 24-inch Erie County Water Authority (ECWA) water main located within the northbound travel lane of Slade Avenue. The proposed water distribution system will consist of 8 & 10-inch AWWA C900 water main and will be designed to accommodate both domestic water demand and fire protection requirements for the development. Proposed and future buildings within the redevelopment will be served by separate 6-inch polyethylene combined water services connected to the proposed private water main system. The water distribution infrastructure has been designed to support the phased development of the site while providing adequate domestic and fire flow capacity for the ultimate build out condition. The proposed 8-inch water main will extend into a dedicated insulated enclosure housing the water meter and backflow prevention equipment. This enclosure will contain a reduced pressure zone (RPZ) backflow preventer and will be heated to prevent freezing during winter conditions. Discharge resulting from RPZ testing, maintenance, or relief valve operation will be conveyed by gravity to the nearest drainage inlet. The property owner will be responsible for maintaining the drainage conveyance system and ensuring that all drainage ports remain free of snow, ice, and debris to allow proper operation. Water service within the apartment buildings will be utilized for typical domestic purposes, including potable water supply and fire protection. Four private hydrants will be installed on site as part of the development to ensure fire hose coverage not exceeding 400’. Domestic Summary: Peak Operating Demand: 168.38 gpm Water Main: 24” on Slade Avenue Static Pressure: 90 psi (Per ECWA) Friction Loss: 0.0 psi Loss through meter/RPZ: 13 psi Elevation Loss: 12.99 psi Pressure after RPZ: 77.0 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. West Seneca Exchange 07/20/2026 1 of 3 Page 674 of 1174