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Village of East Aurora Water System Improvements July 2026 SEQRA Part 3 Supporting Information The proposed water main replacements will be installed below ground within existing roadway rights-of-way and maintained areas and will not alter existing flood storage capacity, flood conveyance, or flood elevations. All disturbed areas will be restored following construction, and no permanent encroachments within the floodway are proposed. The project will be designed and constructed in accordance with applicable local floodplain development requirements. No new water services or system extensions are proposed as part of the project, so no new developments in special flood hazard areas are expected. 5.b. The proposed action may result in development within a 100-year or a 500- year floodplain. See response to 5.a., above. 5.d. The proposed action may result in, or require, modification of existing drainage patterns. Temporary ground disturbance will occur during replacement water main installation and hydrant and gate valve replacement. The proposed improvements will be constructed primarily within existing roadway rights-of- way and maintained areas and will not substantially alter existing site grades, drainage patterns, or stormwater conveyance systems. Stormwater runoff will continue to be conveyed through the existing roadside drainage system to on- and off-site surface waters. A SWPPP will be prepared and implemented during construction to minimize erosion and sediment transport. The SWPPP will include temporary erosion and sediment control measures and post- construction site stabilization. Because the project does not permanently modify existing drainage patterns or increase impervious surface area, significant impacts to drainage are not anticipated. 6. Impacts on Air No air permits will be needed for the construction or operation of the project. There will be an increase in fossil fuel consumption by heavy machinery during construction; however, this minor and temporary increase in vehicular emissions is not anticipated to have any measurable impact on local air quality. 7. Impacts on Plants and Animals 7.b. The proposed action may result in a reduction or degradation of any habitat used by any rare, threatened or endangered species, as listed by New York State or the federal government. 6