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Village of East Aurora Water System Improvements July 2026 SEQRA Part 3 Supporting Information may be required during excavation in areas of shallow groundwater and will be conducted, if necessary, in accordance with the project Stormwater Pollution Prevention Plan (SWPPP) and applicable permit requirements. A SWPPP will be prepared and implemented to minimize erosion, sedimentation, and potential impacts to groundwater and surface waters during construction. The project will obtain coverage under the NYSDEC SPDES General Permit for Stormwater Discharges from Construction Activity (GP 0-25-001) prior to construction. Directional drilling will be utilized where practicable to minimize disturbance at wetland and stream crossings, and all work will be completed in accordance with applicable NYSDEC and USACE permit conditions. As a result, impacts associated with construction in areas of shallow groundwater are expected to be temporary and minor. 1.b. The proposed action may involve construction on slopes of 15% or greater. Areas of steeper slopes are primarily located along Mill Road, Fairlawn Drive, and Nye Hill Road, where work will consist of replacement of existing water mains and hydrants within existing roadway rights-of-way. A SWPPP will be prepared and implemented to minimize erosion and sedimentation during construction, including the use of appropriate erosion and sediment control practices in areas of steeper slopes. Disturbed areas will be stabilized and restored following construction. As a result, impacts associated with construction on slopes of 15 percent or greater are expected to be temporary and minor. 1.f. The proposed action may result in increased erosion, whether from physical disturbance or vegetation removal (including from treatment by herbicides). The proposed project will involve approximately 9 acres of temporary ground disturbance associated with water main installation, water service transfers, hydrant and gate valve replacement, and construction of the replacement booster pump station. Temporary increases in erosion may occur during construction due to soil disturbance. No herbicide treatment is proposed as part of the project. The replacement booster pump station will be constructed at the existing booster pump station site, and no net increase in impervious surface area is anticipated. Stormwater runoff from the project area is conveyed to existing roadside drainage systems that ultimately discharge to Cazenovia Creek, Tannery Brook, and their tributaries. A SWPPP will be prepared and implemented in accordance with the NYSDEC SPDES General Permit for Stormwater Discharges from Construction Activity. The SWPPP will include erosion and sediment control measures and post-construction stabilization requirements to minimize erosion and sediment transport during construction. 3