Installation Restoration Program: Closure Investigation Report. Site 1: Former Base Landfill; Stewart Air National Guard Base, Newburgh, New York. Volume I.
ANEPTEK CORP NATICK MA
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A Closure Investigation Cl of Site 1, the former Base Landfill at Stewart Air National Guard Base the Base located at the Stewart International Airport lAP, was performed by Aneptek Corporation ANEPTEK. Site 1 is located southeast of the airport complex. Site 1 and Site 2 the former pesticide pit disposal area have been the subject of several previous investigations by both the New York State Department of Environmental Conservation NYSDEC and the National Guard Bureau. Scope of Investigation. The CI field program included air monitoring and the sampling of subsurface soils, surface water and groundwater to provide data for an evaluation of site geology, hydrogeology, and potential environmental impacts from the Site 1 landfill. Ml groundwater and surface water samples submitted for off-site laboratory analysis were analyzed for the full list of Baseline Parameters provide in Chapter 6 of the New York Codes, Rules, and Regulations 6 NYCRR Part 360-2.11. Physical characteristics of the fill and cover material were defined through the installation and monitoring of slope stability monuments and settlement pads. Test pits were excavated to determine the lateral extent of waste. Soil samples collected from the existing interim cover were submitted to an off-site laboratory for grain size analyses. Slug tests were performed on monitoring wells to provide estimates of formation hydraulic conductivity. In accordance with the requirements of 6 NYCRR Part 360-2.15, an explosive gas investigation was conducted using a slam-bar and monitoring gasses with a flame ionization detector FID and a meter capable of detecting percent oxygen, percent lower explosive limit LEL, carbon monoxide, and hydrogen sulfide. A complete site walkover of the landfill was made to locate any areas of leachate outbreak and a vector survey was conducted by a field biologist.
- Miscellaneous Materials
- Environmental Health and Safety