Brownfield Redevelopment and Civil Site Engineering

Wellington Square — Bronxville, NY

Ground Penetrating Radar

Galli Engineering successfully entered this project into the New York State Brownfield Cleanup Program. This 1.74 acre site is currently used for at-grade parking by the Village of Bronxville. The project site is located directly adjacent to the Metro North Railroad right of way at the Bronxville Station. Around 1905, the "Hotel Gramatan Power and Light Plant" was built on the middle lot of the site. Coal was used to fuel the power plant until 1961, when the plant switched over to fuel oil. In 1910, the South Bronxville (Gramatan) Garage was built on the southern lot. The garage was used as an automobile service station and a gasoline filling station. The Village of Bronxville acquired the property in the 1980s, and the Gramatan Garage and power plant were demolished and used as parking lots. There was a large amount of residual contamination and debris left on site from the demolition of the power plant, and this has negatively impacted the environmental quality of the site.

Soil samples have demonstrated the presence of elevated petroleum constituents and total petroleum hydrocarbons. Portions of the site have been assigned spill numbers by the New York State Department of Environmental Conservation (NYSDEC). Based on the age of some of the buildings located on the project site, there is reason to suspect the presence of lead containing paint and asbestos containing materials.

To address these issues, Galli Engineering prepared the site-specific Health and Safety Plan and all required workplans and protocols for the investigation of the areas of environmental concern, and mitigation of these areas. Galli completed the Phase I and Phase II Environmental Site Assessments. This work included the use of ground penetrating radar to survey the entire parking lot area, installation of soil borings, groundwater and soil sample collection and a geotechnical investigation. Analytical data confirms that the subject property has been impacted by contaminants that are consistent with the past use of the parcels (i.e. a former gasoline service station, automotive repair and parking facility at the south parking lot; and a former heat and light power plant at the central parking lot property). Based on the field results, Galli made recommendations for environmental site remediation and mitigation of existing site contamination.

The development of the property will include up to 65 luxury, empty nester condominiums in four-story buildings and the construction of a below grade 300 space parking garage. Galli Engineering designed a sub-slab venting system, Stormwater Pollution Prevention Plan and Stormwater filtration and detention basin design amongst other civil engineering aspects of the building.