Connectquot Stormwater

Project Location: Islip, NY
Client: Town of Islip

Middlesex Avenue, from Shore Avenue to the street end at Grand Canal in Oakdale has experienced long term flooding issues that frequently occur following storm events. The existing roadway has minimal drainage infrastructure, varying width and significant areas of ponding in low areas along the gutter of the roadway.

NPV and our engineering affiliate Nelson + Pope (N+P) prepared design plans for the complete reconstruction of Middlesex Avenue including new roadway alignment and profile; multiple sections of road raising; rebuilding of the existing bulkhead at the drainage outlet on Shore Road; installation of a new drainage system; installation of a stormwater treatment structure; construction of a bio-swale area for stormwater treatment and infiltration; and installation of an in-line check valve to prevent tidal backflow.

NPV completed the SEQRA Environmental Assessment Form (EAF), prepared wetland applications and obtained various permits including a New York State Department of Environmental Conservation (NYSDEC) Article 25 tidal wetlands permit and an Army Corps of Engineers (USACOE) permit for the construction of shoreline stabilization and drainage improvements within a Significant Coastal Fish and Wildlife Habitat. A coastal consistency review was also prepared in support of a New York State Department of State (NYSDOS) application, including an assessment of related State Coastal Policies. NPV also completed soil borings to assist in understanding depth to groundwater and informing the project design.

This project included preliminary and final construction cost estimates, coordination with public and private utilities, preparation of Final Plans, Specifications, and Estimate for construction of the proposed drainage work, general construction support; and full-time construction inspection.