HEALTH CONSULTATION
MERVIS INDUSTRIES
MATTOON, COLES COUNTY, ILLINOIS
Comparison Values Used In Selecting Contaminants
Environmental Media Evaluation Guidelines (EMEGs) are developed for chemicals based on their toxicity, frequency of occurrence at National Priority List (NPL) sites, and potential for human exposure. 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 conservative concentration values designed to protect sensitive members of the population.
Reference Dose Media Evaluation Guides (RMEGs) are another type of comparison value derived to protect the most sensitive populations. They do not consider carcinogenic effects, chemical interactions, multiple route exposure, or other media-specific routes of exposure, and are very conservative concentration values designed to protect sensitive members of the population.
Cancer Risk Evaluation Guides (CREGs) are estimated contaminant concentrations based on a one excess cancer in a
million persons exposed to a chemical over a lifetime. These are also very conservative values designed to protect sensitive
members of the population.
| TABLE 1 -- On- and Off-site Soil/Sediment Contamination -- Mervis Industries | |||||||
| Chemical Name | Frequency of Detection |
Maximum Concentration | Comparison Value (ppm) |
Source of Comparison Value |
Illinois
Background Soils (ppm) |
||
| Soil | Sediment | Soil (ppm) |
Sediment (ppm) |
||||
| 2-methylnapthalene | 4/8 | 1/5 | 68 | .088 | N/A | ||
| Phenanthrene | 6/8 | 3/5 | 27 | .340 | N/A | ||
| Chrysene | 6/8 | -- | 2.8 | -- | N/A | ||
| Benzo(a)pyrene | 5/8 | 2/5 | 1.5 | .25 | 0.1 | CREG | |
| Hepatachlor Epoxide |
2/8 | -- | .26 | -- | .08 | CREG | |
| Arochlor-1232 | 1/8 | -- | 1.9 | -- | N/A | ||
| Arochlor-1240 | 2/8 | -- | 13 | -- | N/A | ||
| Arochlor-1248 | 3/8 | -- | 1.4 | -- | N/A | ||
| Arochlor-1260 | 2/8 | -- | .9 | -- | N/A | ||
| Copper | 8/8 | -- | 533 | -- | 1-156 | ||
| Iron | 8/8 | -- | 174,000 | -- | 3,200-80,000 | ||
| Lead | 8/8 | -- | 1,130 | -- | 1,000 | IDPH | |
*ppm = parts per million
Table 2. Potential Exposure Pathways
|
Pathway name |
Exposure Pathway Elements |
Time |
||||
|
Source |
Environmental medium |
Point of exposure |
Route of exposure |
Exposed population |
||
| Soil | Site | Soil | On-site soil | Ingestion Inhalation Skin contact |
Trespassers & on-site workers. (estimated number of persons potentially exposed = 20) | Past Present Future |
