Sample Name: OU4-SS-05-COMP4(0-1)

Sample date: June 6, 2005
Operable Unit: 4
Sample Type: Water or Groundwater
Sample Depth: 0-1 in
Location Description: sampling interval: top of screen 100 ft below land surface, bottom of screen 110 ft below land surface

Contaminants above MCL for drinking water :

• Arsenic
• Barium
• Copper
• Lead
• Zinc

Latitude: +41.32638      Longitude: -89.314331

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	16.5 mg/L
Barium	2 mg/L	1640 mg/L
Beryllium	0.0002 mg/L	NT mg/L
Cadmium	0.005 mg/L	<39.5 mg/L
Calcium	(No MCL)	NT mg/L
Chromium	0.1 mg/L	<115 mg/L
Cobalt	(No MCL)	<96.9 mg/L
Copper	1.3 mg/L	24.8 mg/L
Iron	0.3* mg/L	<13700 mg/L
Lead	0.015 mg/L (Action Lvl)	555 mg/L
Magnesium	(No MCL)	NT mg/L
Manganese	0.05* mg/L	<414 mg/L
Mercury	0.002 mg/L	<10.5 mg/L
Nickel	(No MCL)	<23.3 mg/L
Potassium	(No MCL)	NT mg/L
Phosphorus	(No MCL)	NT mg/L
Selenium	0.05 mg/L	<3.25 mg/L
Silver	0.10* mg/L	<27.4 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	2550 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.