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HEALTH CONSULTATION

DECATUR/BARDING & SPAWR LANDFILL
DECATUR, MACON COUNTY, ILLINOIS


FIGURES, ATTACHMENTS, AND TABLES


Figure 1. Site Location Map


Figure 2. Site Layout


Figure 3. Sampling Locations


Figure 4. Approximate Sample Locations

Attachment 1

Comparison Values Used in Screening Contaminants for Further Evaluation

Maximum Contaminant Levels (MCLs) are national primary drinking water regulations issued by USEPA under theauthority of the Safe Drinking Water Act. They are enforceable drinking water regulations that are protective of publichealth (considering the availability and economics of water treatment technology) over a lifetime (70 years) at an exposurerate of 2 liters of water per day. MCLs apply to all public water systems including community water systems and transientand non-transient non-community water systems.

Minimal Risk Level (MRL) is an estimate of daily exposure of a human being to a chemical that is likely to be without anappreciable risk of deleterious effects (noncarcinogenic) over a specified duration of exposure.

Environmental Media Evaluation Guides (EMEGs) are developed for chemicals based on their toxicity, frequency ofoccurrence at National Priority List (NPL) sites, and potential for human exposure. They are derived to protect the mostsensitive 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 estimates of a daily oral or inhalation exposure to a particularchemical that is unlikely to produce any noncarcinogenic adverse health effects over a lifetime. They are conservativevalues designed to protect sensitive members of the population.

Cancer Risk Evaluation Guides (CREGs) are estimated contaminant concentrations based on a one excess cancer in amillion persons exposed to a chemical over a lifetime. These are also very conservative values designed to protect sensitivemembers of the population.



Table 1.

Contaminants of Concern found in the Groundwater--Site Screening Inspection [1]
Contaminants Location/Concentration (µg/L) Comparison Value
GW01 GW02 GW03 GW04 GW05 GW06 GW08 µg/L Source
Antimony 34.9 19.5 26.5 28.7 29.1 23.8 18.4 6.0 MCL
Arsenic ND ND ND ND ND ND 94.3 50
3.0
10
MCL
EMEGc
EMEGa
Manganese 233 4890 1280 5840 386 ND ND 150 MCL
ND - Not Detected
MCL - Maximum Contaminant Level
EMEGc - for a child
EMEGa - for an adult
µg/L - micrograms per liter


Table 2.

Inorganic Contaminants of Concern found in Soil and Sediment--Site Screening Inspection [1]
Contaminants Location/Concentration (ppm) Comparison Value
ST01 ST02 ST03 ST04
(Bkgd)
SS01 SS02 SS03 SS04
(Bkgd)
ppm Source
Arsenic 5.0 14.1 49.3 8.5 5.1 3.7 7.1 3.7 0.5
20
200
CREG
EMEGc
EMEGa
EMEGc - for a child
EMEGa - for an adult
ppm - parts per million
Bkgd - Background sample

Table 3.

Contaminants of Concern found in the Groundwater--STEP [2]
Contaminants Location/ Concentration
(µg/L)
Comparison Value
G101 G102 G103
(dup)
µg/L Source
Benzene ND 11.0 9.0 5.0 MCL
Antimony 9.8 11.9 11.1 6.0 MCL
Manganese 1,650 ND ND 150 MCL
Selenium ND ND 54.2 50 MCL
Thallium ND 35.5 39.3 2.0 MCL
ND - Not detected
µg/L - micrograms per liter
MCL - Maximum Contaminant Level
dup - duplicate sample



Table 4.

Contaminants of Concern found in the Soil and Sediment--STEP [2]
Contaminants Location/Concentration (ppm) Comparison Value
X101
(Bkgd)
X102 X103
(dup)
X105 X201 X202 X203 X204 ppm Source
Acenaphthylene ND ND ND ND 0.053 0.090 0.047 ND 0.005 ATSDR
Phenanthrene ND 1.3 0.16 0.51 ND 0.21 0.37 ND 0.14 ATSDR
Chrysene ND ND ND ND 0.71 ND ND ND 0.64 ATSDR
Benzo(a)pyrene ND 0.59 0.14 ND 0.77 0.82 0.56 ND 0.1
1.3
CREG
ATSDR
Arsenic 7.9 7.5 6.8 2.6 2.7 7.2 4.7 31 0.5
20
200
CREG
EMEGc
EMEGa
Beryllium 0.68 0.67 0.67 0.49 0.45 0.82 0.65 0.6 0.2
9.9
CREG
IEPA
ND - Not detected
ppm - parts per million
ATSDR - Agency for Toxic Substances and Disease Registry PAH Toxicological Profile
EMEGc - for a child
EMEGa - for an adult
IEPA - Illinois Environmental Protection Agency
dup - duplicate sample


Table 5.

Potential Exposure Pathways
Pathway
name
Exposure Pathway Elements Time
Source Environmental
medium
Point of
exposure
Route of exposure Exposed
population
Private
Wells
Site Groundwater Homes Ingestion Area Residents
(estimated number
of persons
potentially exposed
= 100)
Past
Present
Future


Table of Contents

  
 
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