The site is underlain by alluvial deposits up to 25 feet thick, and as much as 166 feet of dense glacial till deposits. A sand layer near the base of the till exists at some locations up to 25 feet in thickness. Bedrock is a high grade metamorphic felsic gneiss. Depth to bedrock ranges from 86 feet to 166 feet. Bedrock is moderately weathered and fractured from 86 to 140 feet. Competent bedrock was found below 140 feet. Depth to groundwater ranged from 36 to 1.25 feet.
Targeted Environmental Media:
 Fractured Bedrock
There are two overburden plumes. The eastern plume is approximately 300 feet wide by 600 feet long. The western plume is approximately 600 feet long by 450 feet wide. The bedrock plume is approximately 1,560 feet long by 960 feet wide.
Major Contaminants and Maximum Concentrations:
- Trichloroethene (Not given)
- 1,2-Dichloroethene (Not given)
- Vinyl chloride (Not given)
No technologies selected.
- Pump and Treat
Comments:
The pump and treat system employs five 240 feet deep bedrock extraction wells. The system pumps 20 to 30 gallons per minute. See http://www.epa.gov/ne/cleanup/rcra/979.pdf
There are other VOCs present than those named above.
None provided
The RCRA groundwater pump and treat system continues to be operating as designed.
http://yosemite.epa.gov/R1/npl_pad.nsf/31c4fec03a0762d285256bb80076489c/b6703c52db55152985256c2f00617283!OpenDocument
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