The geology of the study area consists of unconsolidated, silty, clay-rich soils overlying the bluish-gray limestone and dolomite of the Conestoga Limestone, Ledger Dolomite, and the Elbrook Formation.

The local aquifer is formed by the carbonate bedrock units that underlie the area. These include the Conestoga Limestone and Ledger Dolomite at the site. Groundwater migration through these units is through fractures and solution channels and along bedding planes within the rock mass. Intergranular permeability and porosity are very low. The water table at the site is found within the bedrock material. Depth to groundwater ranges from nine to 26 feet below ground surface throughout the study area. A northwest- to-southeast-trending groundwater divide that bisects the AIW Frank portion of the site has been delineated.

The Conestoga Limestone displayed a greater abundance of solution cavities/ voids than did the Ledger Dolomite in the site vicinity. However, the Ledger Dolomite appeared to have a greater abundance of fracture zones than the Conestoga Limestone.

• Fractured Bedrock

In 2005 the 10 ug/L line of the TCE plume was about 2,920 feet long and 320 feet wide. Vertical depth was not given.

• 1,1-Dichloroethene (1,900 µg/L)
• 1,1-Dichloroethane (780 µg/L)
• 1,2-Dichloroethene (10,400 µg/L)
• 1,1,1-Trichloroethane (500 µg/L)
• Trichloroethene (6,850 µg/L)
• Toluene (1,400 µg/L)
• Vinyl chloride (22 µg/L)
• Tetrachloroethene (68 µg/L)

• Coring

• Chemical Oxidation (In Situ)
  • Permanganate
• Pump and Treat

Cleanup goals are MCLs when available.
Trichloroethene 5
1,1,1-Trichloroethane 200
1,1-Dichloroethene 7
1,1-Dichloroethane 81
1,1,2-Trichloroethane 5
cis-1,2 Dichloroethene 70
1,2-Dichloropropane 5
Tetrachloroethene 5
Vinyl Chloride 2
Toluene 1,000
Chloroform (THM) 100
Arsenic 10
Manganese 80

Pump and treat continues and groundwater concentrations are decreasing. The site has had at least one full scale treatment with sodium permanganate.

http://cfpub.epa.gov/supercpad/cursites/csitinfo.cfm?id=0300773