GIBRALTAR MANUFACTURING COMPANY
EAST ALTON, MADISON COUNTY, ILLINOIS
|Total Lead (ppm)||Sample Location|
|518||12-E (PID 2.7 - lab sample at 8-12')|
|52.4||2-E (PID 2.3 - 12-15' lab sample)|
|45.6||11-C (PID 3.1 - 8-12' lab sample)|
|13.8||2-D (PID 4.8 - 8-12' lab sample)|
|9.2||2-C (PID 3.1 - 8-12' lab sample)|
|8.35||11-D (PID 3.1 - 8-12' lab sample)|
Mean = 821.02
Median = 346
Comparison Values used:
Arsenic - 20 ppm for children ATSDR soil chronic EMEG 
Cadmium - 40 ppm for children ATSDR soil chronic EMEG 
Copper - 150 ppm is Illinois urban background 
Lead - 1,000 ppm for children playing in bare contaminated soil 
|Contaminant||Sample location with |
|Comparison Soil Value|
|Methylene chloride||12-E (surface)||0.140||90||CREG|
|Xylenes (total)||012-E (4'-8')||0.110||1,000||IEMEG|
Comparison Values Used In Screening Contaminants For Further Evaluation
Environmental Media Evaluation Guides (EMEGs) are developed for chemicals based on theirtoxicity, frequency of occurrence at National Priority List (NPL) sites, and potential for humanexposure. They are derived to protect the most sensitive populations and are not cut-off levels,but rather comparison values. They do not consider carcinogenic effects, chemical interactions,multiple route exposure, or other media-specific routes of exposure, and are very conservativeconcentration values designed to protect sensitive members of the population.
Reference Dose Media Evaluation Guides (RMEGs) are another type of comparison valuederived to protect the most sensitive populations. They do not consider carcinogenic effects,chemical interactions, multiple route exposure, or other media-specific routes of exposure, andare very conservative concentration values designed to protect sensitive members of thepopulation.
Cancer Risk Evaluation Guides (CREGs) are estimated contaminant concentrations based on oneexcess cancer in a million persons exposed to a chemical over a lifetime. These are also veryconservative values designed to protect sensitive members of the population.
Maximum Contaminant Levels (MCLs) have been established by USEPA for public watersupplies to reduce the chances of adverse health effects from contaminated drinking water. Thesestandards are well below levels for which health effects have been observed and take into accountthe financial feasibility of achieving specific contaminant levels. These are enforceable limits thatpublic water supplies must meet.
Lifetime Health Advisories for drinking water (LTHAs) have been established by USEPA and arethe concentration of a chemical in drinking water that is not expected to cause any adverse non-carcinogenic effects over a lifetime of exposure. These are conservative values that incorporate amargin of safety.