U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Fractured Bedrock Project Profiles

Last Updated: December 31, 2010

Point of Contact:
Carol Stein
USEPA
290 Broadway
New York NY 10007-1866 
Tel: 212-637-4181 
Email: stein.carol@
pa.gov

Ciba Geigy - Hercules Plant Site
Glens Falls, NY


Hydrogeology:

Groundwater beneath the site flows laterally through shallow relatively permeable fill and lacustrine sand. A
clay layer underlies most of the site and this together with the underlying bedrock unit forms a lower boundary to the shallow flow zone. The underlying bedrock has three progressively deeper, highly fractured bedrock water-bearing
zones known as Horizons A, B, and C.

Targeted Environmental Media:
  • - Dense Non-aqueous Phase Liquids (DNAPLs)
  • - Fractured Bedrock

Contaminants:

The site is on the banks of the Hudson River and the plume in the overburden and shallow fractured rock zone discharge to it.

Major Contaminants and Maximum Concentrations:
  • - Cyanide (50,000 µg/L)
  • - Chromium (20,000 µg/L)

Site Characterization Technologies:

No technologies selected.


Remedial Technologies:

  • - Pump and Treat
Comments:
Organic contamination for this site is given in terms of total volatile organic chemicals. The maximum value reported in the reference document is 20,000 ug/L in the overburden groundwater and 10,000 ug/L in the "B" bedrock fracture zone.

The overburden plume is being contained with a french drain type system.

All of the collected water is co-mingled and diverted through a force main to the point that it is sampled and discharged to the municipal system. Although industrial wastewater was formerly treated on-site (at the Pre-Treatment Plant), the groundwater extraction system water meets the criteria for discharge to the POTW, and is not treated.
Remediation Goals:

New York Groundwater Quality Standards which are typically 5 ug/L for VOCs.


Status:

Fourteen groundwater recover wells are installed in the A horizon bedrock and 6 are in the B horizon bedrock.

In comparison to the pre-remedy groundwater data, 2008 groundwater data shows that Horizon A bedrock chromium and VOCs have decreased significantly at all locations. Cyanide has decreased overall across the site, but one well had a cyanide concentrations just slightly below the August 2001 (pre-remedy) level. In Horizon B, north of the railroad tracks, VOC and chromium have been reduced by an order of magnitude, cyanide by 30-50%. South of the railroad tracks, similar reductions in chromium and cyanide have occurred, with a larger reduction in VOCs.

http://www.epa.gov/region02/waste/fsciba.htm

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