Sample Name: OU4-SS-06-COMP5(6-12)

Sample date: June 7, 2005
Operable Unit: 4
Sample Type: Water or Groundwater
Sample Depth: 6-12 in
Location Description: Soil sample interval removed during CWP closure and reconstruction

Contaminants above MCL for drinking water :

• Arsenic
• Copper
• Iron
• Lead
• Mercury
• Zinc

Latitude: +41.324394      Longitude: -89.302926

Metal Contaminants:

Contaminant	MCL	Amount Detected
Aluminum	0.05 to 0.2* mg/L	NT mg/L
Antimony	0.006 mg/L	NT mg/L
Arsenic	0.01 mg/L	13.2 mg/L
Barium	2 mg/L	<327 mg/L
Beryllium	0.0002 mg/L	NT mg/L
Cadmium	0.005 mg/L	<41.6 mg/L
Calcium	(No MCL)	NT mg/L
Chromium	0.1 mg/L	<125 mg/L
Cobalt	(No MCL)	<145 mg/L
Copper	1.3 mg/L	36.2 mg/L
Iron	0.3* mg/L	30400 mg/L
Lead	0.015 mg/L (Action Lvl)	168 mg/L
Magnesium	(No MCL)	NT mg/L
Manganese	0.05* mg/L	<508 mg/L
Mercury	0.002 mg/L	11.9 mg/L
Nickel	(No MCL)	<28.7 mg/L
Potassium	(No MCL)	NT mg/L
Phosphorus	(No MCL)	NT mg/L
Selenium	0.05 mg/L	<2.99 mg/L
Silver	0.10* mg/L	<28.8 mg/L
Sodium	(No MCL)	NT mg/L
Thallium	0.002 mg/L	NT mg/L
Vanadium	CCC^ mg/L	NT mg/L
Zinc	5* mg/L	2100 mg/L

Notes: A value of NT indicates that this sample was not tested for a particular contaminant. A value of ND indicates that the contaminant was not detected in the test that was done for it. *Indicates that the MCL (Maximum Contaminant Level) for drinking water is a secondary standard by the EPA. ^ Indicates a Chemical Contaminant Candidate issued by the EPA. # Indicates concentrations in excess of 0.1 mg/L suggest domestic of agricultural sources of waste.