Sample Name: SW-6

Sample date: October 11, 2007
Operable Unit: 5
Sample Type: Water or Groundwater
Sample Depth: 2.04 in
Location Description: Surface Water- DePue Lake- Ambient Water (Low Flow)- Unfiltered Data

Contaminants above MCL for drinking water :

• Aluminium
• Iron
• Lead
• Manganese
• Sulfate

Latitude: +41.3203052      Longitude: -89.2977366

Metal Contaminants:

Contaminant	MCL	Amount Detected
Aluminum	0.05 to 0.2* mg/L	1.9 mg/L
Antimony	0.006 mg/L	<0.010 mg/L
Arsenic	0.01 mg/L	<0.0032 mg/L
Barium	2 mg/L	0.084 mg/L
Beryllium	0.0002 mg/L	0.00025 mg/L
Cadmium	0.005 mg/L	0.0026 mg/L
Calcium	(No MCL)	123 mg/L
Chromium	0.1 mg/L	0.0043 mg/L
Cobalt	(No MCL)	0.0039 mg/L
Copper	1.3 mg/L	0.028 mg/L
Iron	0.3* mg/L	2.7 mg/L
Lead	0.015 mg/L (Action Lvl)	0.028 mg/L
Magnesium	(No MCL)	61 mg/L
Manganese	0.05* mg/L	0.61 mg/L
Mercury	0.002 mg/L	<0.00010 mg/L
Nickel	(No MCL)	0.0083 mg/L
Potassium	(No MCL)	6.1 mg/L
Phosphorus	(No MCL)	0.66 mg/L
Selenium	0.05 mg/L	<0.0033 mg/L
Silver	0.10* mg/L	<0.00050 mg/L
Sodium	(No MCL)	81 mg/L
Thallium	0.002 mg/L	<0.0040 mg/L
Vanadium	CCC^ mg/L	0.0067 mg/L
Zinc	5* mg/L	0.49 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.