The site is located next to the Hudson River. There is a sand overburden aquifer that is about 30 feet deep. The sand transitions to a silt and clay unit. This gradual change (called a gradational contact) results in the presence of a series of thin alternating layers of sand and silt/clay.
Targeted Environmental Media:
 Dense Non-aqueous Phase Liquids (DNAPLs) - Fractured Bedrock
Not provided by documents available. A discussion in the human exposures contained document indicates there is some contamination in the shallow bedrock aquifer Between 45 and 75 feet below grade.
Major Contaminants and Maximum Concentrations:
- 1,1,1-Trichloroethane (1,100 µg/L)
- 1,1-Dichloroethane (940 µg/L)
- Aroclor 1242 (310 µg/L)
- Aroclor 1254 (5 µg/L)
- Trichloroethene (4,300 µg/L)
- 1,2-Dichloroethene (7 µg/L)
- Vinyl chloride (11 µg/L)
- Benzene (11 µg/L)
- Polychlorinated biphenyls (PCBs) (86,200 µg/L)
No technologies selected.
- Pump and Treat
Comments:
The site also has kerosene related contamination. PCBs are found at the site as DNAPLs. The high PCB value given above is for a shallow bedrock well. The values for vinyl chloride and 1,2-dichloroethene are for shallow bedrock. The overburden aquifer has much higher values with total VOCs being up to 10,000 ug/L. The shallow bedrock near the river has PCB DNAPL.
New York State Groundwater Quality Criteria.
The site has both overburden and shallow bedrock recovery wells. DNAPL is also being recovered. Between September 2004 and June 2005 (nine months), the system recovered over 6,000 gallons of DNAPL. The pumping system continues at the site.
The groundwater plume has been reduced in area since these treatment systems began operating, to less than 50 percent of its original size, and contaminant concentrations have diminished considerably as well.
http://www.epa.gov/region02/waste/fsgefort.htm
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