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: January 1, 2011

Point of Contact:
Gloria Sosa
290 Broadway
New York NY 10007-1866 
Tel: 212-637-4283 
Email: sosa.gloria@

Dupont/Necco Park
Niagara Falls, NY


Three geologic units exist beneath the Necco Park Site. These units include unconsolidated overburden, the
Lockport Dolomite Formation, and the Rochester Shale Formation. The Lockport Formation underlies unconsolidated overburden deposits. In general, the top of bedrock is relatively unweathered. The Lockport Formation within the study area ranged in thickness from 142 to 151 feet. The Rochester Shale is a non-permeable formation which underlies the Lockport Formation.

Overburden is defined as the A zone. As a consequence of the low hydraulic conductivity (1 x 10 -7 cm/sec)
estimated for those areas of the A zone where most liquid disposal occurred, groundwater in the overburden tends to flow vertically downward to the more transmissive bedrock units.

The upper bedrock, which includes water-producing fracture zones in approximately the upper 30 feet of the
Lockport Dolomite, corresponds to the B and C zones at the Necco Park Site. Groundwater in the B and C zones generally flows to the south towards the Niagara River.

Groundwater in the D, E, and F fracture zones generally flows in a westerly direction toward the New York Power Authority power conduits. This groundwater is intercepted by the conduit drain system.

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


The source area plume is being addressed. The off site plume is not.

Major Contaminants and Maximum Concentrations:
  • - Hexachlorobutadiene (120,000 µg/L)
  • - Pentachlorophenol (28,000 µg/L)
  • - Carbon tetrachloride (210,000 µg/L)
  • - Chloroform (200,000 µg/L)
  • - Trichloroethene (270,000 µg/L)
  • - Tetrachloroethene (69,000 µg/L)
  • - 1,1,2,2-Tetrachloroethane (170,000 µg/L)
  • - 1,2-Dichloroethene (85,000 µg/L)
  • - Vinyl chloride (19,000 µg/L)
  • - 1,1-Dichloroethene (22,000 µg/L)

Site Characterization Technologies:

No technologies selected.

Remedial Technologies:

  • - Pump and Treat
The pump and treat system has been operational since 2005.
Remediation Goals:

Off site groundwater is New York State water quality standards and/or MCLs. On site is to the extent practicable.


An assessment of data from groundwater chemical monitoring for the past several years indicate an overall decrease in total volatile organic compounds (VOCs) for all flow zones both in the source and far-field areas.
During 2008, more than 12 million gallons of groundwater were extracted and treated at the GWTF and approximately 512 gallons of DNAPL were removed.

Top of Page