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PUBLIC HEALTH ASSESSMENT

U.S. DEFENSE GENERAL SUPPLY CENTER
RICHMOND, CHESTERFIELD COUNTY, VIRGINIA


APPENDIX A. TABLES

Table 1: 1990 Census Data for DGSC Area

Table 1.

Human Health Effects at Various Hydrogen Sulfide Concentrations in Air
Block
Group 1
Block
Group 2
Block
Group 3

Total
persons
1,231213142

% Male

33.346.063.4
% Female66.754.036.6

% White

51.794.469.7
% Black

47.34.226.1
% Other
races
1.01.44.2

% Younger
than 10

44.99.421.8
% Age 65
and over
2.415.52.1

Households*

48010033
Persons per
household

2.562.133.03
% Owner
occupied

6.258.06.1
% Renter
occupied

93.842.093.9
Median value
of owner-
occupied units

$55,000$49,400$50,000
Median monthly
rent for renter-
occupied units
$351$335$510

Reference: U.S. Bureau of the Census 1991

*= A household is defined as an occupied housing unit but doesnot include group quarters such as military barracks,prisons, and college dormitories.


Table 2.

Groundwater Contaminants of Concern for the Open Storage Area
Chemical Concentration Ranges (ppb) Comparison Values
(ppb)

Groundwater



1,1-Dichloroethylene
BDL*-10
0.058a
Tetrachloroethylene
BDL-140
0b
Trichloroethylene
BDL-210
0b
Reference: (Dames and Moore 1989b)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

*BDL= Below Detection Limit
a= Calculated from the Cancer Slope Factor
b= Maximum Contaminant Level Goal


Table 3.

Groundwater Contaminants of Concern for Area 50
Chemical Concentration Ranges (ppb) Comparison Values (ppb)



Benzene
BDL*-6.4
0a
Chlorobenzene
BDL-1,500
200b
1,2-Dichloroethane
BDL-17
0a
1,1-Dichloroethylene
BDL-19
0.058c
T-1,2-Dichloroethylene
BDL-13,000
100a
Tetrachloroethylene
BDL-3,000
0a
Trichloroethylene
BDL-18,000
0a
Vinyl Chloride
BDL-65
0a
Benzo(a)anthracene
NT**-7
0a
Benzo(k)fluoranthene
NT-14
0a
Chrysene
NT-9
0a
Reference: (Dames and Moore 1989b)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

*BDL= Below Detection Limit
**NT= Analysis for chemical not performed for all samples
a= Maximum Contaminant Level Goal
b= Calculated from the Reference Dose for ingestion by a child
c= Calculated from the Cancer Slope Factor


Table 4.

Contaminants of Concern for the National Guard Area
Chemical Concentration Ranges (ppb) Comparison
Values (ppb)

Groundwater Surface Water

Inside NGA* Outside NGA





Arsenic
NT**
NT
BDL***-520
0.0022a
Beryllium
NT
NT
NT-0.41
0.0068a
Lead
NT
NT
BDL-430
50a
Nickel
NT
NT
NT-230
13.4a
Benzene
BDL-6.4
BDL
BDL
0b
1,2-Dichloroethane
BDL-190
BDL-8.2
NI****
0b
1,1-Dichloroethylene
BDL-45
BDL-7.1
NI
0.058c
T-1,2-Dichloroethylene
BDL-620
BDL-850
BDL-110
100b
1,2-Dichloropropane
BDL-240
BDL
NI
0b
Tetrachloroethylene
BDL-1,100
BDL-37
BDL-5
0b
Trichloroethylene
BDL-7,100
BDL-2,400
BDL-190
0b
PAHs
Chrysene
NT
NT
NT-16
0.0028a
Indeno(1,2,3)Pyrene
NI
NI
NT-47
0.0028a

Reference: (Dames and Moore 1989b, CH2M Hill 1991)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

*NGA= National Guard Area
**NT= Analysis for chemical not performed for samples
***BDL= Below Detection Limit
****NI= No information on the chemical for the medium
a= Ambient Water Quality Criteria--surface water
b= Maximum Contaminant Level Goal--groundwater
c= Calculated from the Cancer Slope Factor--groundwater



Table 5.

Contaminants of Concern for the Fire Training Area
Chemical Concentration Ranges (ppb) Comparison
Values (ppb)

Groundwater Soils Soil Gas

1982 1985 1987 1988 Surface Subsurface October November





Arsenic
NT*
BDL@
BDL-13
BDL-6.9
1000-
10,000
BDL-
21,000
NI**
NI
0a
Beryllium
NT
BDL
BDL-5.2
BDL-2.5
BDL-920
BDL-940
NI
NI
0a
Chromium (hexavalent)
NT
45-180
NT
NT
7,000-
20,000
BDL-
19,000
NI
NI
50b
Lead
BDL
4.7-14
BDL-15
BDL-35
15,000-
102,000
2,300-
52,000
NI
NI
0a
Carbon Tetrachloride
NT
BDL
BDL-
2,600
BDL
NI
NI
NI
NI
0a
1,1-Dichloroethylene
BDL-
18,000
BDL-
5,200
BDL-260
BDL-
6,500
NI
NI
<1-
530+
<1-
245+
0.058c
Methylene Chloride
BDL-
781,000
BDL-
3,700
BDL-40
BDL-
53,000
B***
6.2-46
NI
NI
50b
Tetrachloroethylene
BDL-
21,000
BDL-
19,000
BDL-
1,500
BDL-
16,000
BDL
BDL-
130,000
<0.05-
15
<0.05-
2.4
0a
1,1,1-Trichloroethane
BDL-
154,000
2.2-
78,000
BDL-560
BDL-
52,000
BDL
BDL-
7,300
NI
NI
200a
Trichloroethylene
BDL-
154,000
1-
110,000
BDL-
3,400
BDL-
8,700
BDL
BDL-
76,000
<0.05-
31
<0.05-
14
0a
Chlordane
NI
NI
NI
NI
BDL-
3,200
BDL
NI
NI
0.54c

Reference: (Dames and Moore 1989c)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

*NT= Analysis for chemical not performed on all samples; **NI= No information on the chemical in the medium; ***B= Chemical present in all blanks
+= Chemical may have been 1,1-Dichloroethane; instrument cannot distinguish; @BDL= Below Detection Limit
a= Maximum Contaminant Level Goal--groundwater; b= Environmental Media Evaluation Guide--drinking water; c= Calculated from the Cancer Slope Factor--soil


Table 6.

Groundwater Contaminants of Concern for the Acid Neutralization Pits
Chemical Concentration Ranges (ppb) Comparison Values (ppb)

1987 1988 Maximum Contaminant Level Goal



Arsenic
BDL-4.3
BDL-2.2
0
Lead
BDL-2.3
BDL-5.1
0
1,2-Dichloroethane
BDL-440
BDL-170
0
T-1,2-Dichloroethylene
BDL-140
NT*
100
Tetrachloroethylene
BDL-1,800
BDL-3,700
0
Trichloroethylene
BDL-1,400
BDL-940
0
Reference: (Dames and Moore 1989a)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

*NT= Analysis for chemical not performed for samples


Table 7.

Groundwater Contaminants of Concern in Monitoring Wells for Building 112
October 1992
Chemical Concentration Ranges (ppb) Comparison Values (ppb)






Total Lead
13-56
50a
Total Beryllium
6-16
0.008b
Total Chromium
27-130
50c
Reference: (Law Environmental, Inc. 1993)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

a= Maximum Contaminant Level--groundwater
b= Cancer Risk Evaluation Guide--groundwater
c= Reference Dose Media Evaluation Guide for children--groundwater


Table 8.

Groundwater Contaminants of Concern in Monitoring Wells for the Fuel Oil Storage Area
October 1992
Chemical Concentration Ranges (ppb) Comparison Values (ppb)






1,1,2-Trichloroethane
<0.9-40
0.6a
Tetrachloroethene
<1.0-3.2
0.7a
Trichloroethene
<0.6-300,000(A)
3.0a
Vinyl Chloride
<5.0-240(B)
2.0a
Trans-1,2-Dichloroethene
<0.6-1,500(A)
100.0b
Benzene
<0.2-5.2
5.0b
1,2-Dichlorobenzene
<5.0-660
600.0b
1,4-Dichlorobenzene
<6.0-480
75.0b
Total Lead
27-49
50.0b
Total Chromium
35-78
50.0c

Reference: (Law Environmental, Inc. 1993)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

a= Cancer Risk Evaluation Guide--groundwater
b= Maximum Contaminant Level--groundwater
c= Reference Dose Media Evaluation Guide for children--groundwater

A= Estimated concentration due to the dilution factor being greater than 10x.
B= Estimated concentration; concentration detected in the samples exceeded the calibration range of the instrument. Other samples had concentrationsbelow the detection limit.


Table 9

Table 9.

Contaminants of Concern in Private Wells (Rayon Park Area) May, 1985-January, 1987
Chemical Concentration Ranges (ppb) Comparison Values (ppb)






Benzene
<0.1-1.4
0a
1,2-Dichloroethane
<0.2-6.2
0a
1,1-Dichloroethylene
<0.1-41
0.058b
Tetrachloroethylene
<0.1-4.9
0a
1,1,1-Trichloroethane
<0.2-500
200a
Trichloroethylene
<0.1-5.2
0a

Reference: (Chesterfield Health District 1987)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

a= Maximum Contaminant Level Goal--groundwater
b= Calculated from the Cancer Slope Factor--ingestion


Table 10:

Table 10.

Surface Water Contaminants of Concern in Kingsland Creek
Chemical Contaminant Ranges (ppb) Comparison Values (ppb)


Ambient Water Quality Criteria



Tetrachloroethylene
BDL*-4.6J**
0.8
Trichloroethylene
BDL-18
2.7

Reference: (Dames and Moore 1989c)
Refer to the Beginning of the Environmental Contamination and Other Hazards section for a description of how contaminants of concern are selected.

*BDL= Below Detection Level
**J= Laboratory Estimated Value


APPENDIX B. COMPARISON VALUES, HEALTH GUIDELINES,
AND QUANTITATIVE UNITS

COMPARISON VALUES, HEALTH GUIDELINES, AND QUANTITATIVE UNITS

Comparison values for ATSDR public health assessments arecontaminant concentrations in specific media that are used as anaid to select contaminants for further evaluation. Those valuesusually appear in the Environmental Contamination and OtherHazards and the Public Health Implications section of thisdocument. Health guidelines, which usually appear in the PublicHealth Implications sections of this public health assessment,provide concentrations used to estimate a dose at which healtheffects might or might not be observed. Quantitative unitsexpress the amount of contaminant that has been detected inspecific media. Those units are usually first discussed in theEnvironmental Contamination and Other Hazards section; they aredescribed below.

Comparison Values and Health Guidelines
* AWQC= Ambient Water Quality Criteria
* CREG= Cancer Risk Evaluation Guides
* CSF= Cancer Slope Factor
* EMEG= Environmental Media Evaluation Guides
* LTHA= Lifetime Health Advisory
* MCL= Maximum Contaminant Level
* MCLG= Maximum Contaminants Level Goal
* MRL= Minimal Risk Level
* LOAEL= Lowest Observed Adverse Effect Level
* NOAEL= No Observed Adverse Effect Level
* RfC= Reference Concentration
* RfD= Reference Dose
* RMEG= Reference Dose Media Evaluation Guide

      Quantitative Units

* ppm= parts per million, (milligrams per liter, mg/L of water)
* ppb= parts per billion, (micrograms per liter, µg/L water)
* mg/kg= milligrams per kilogram (mg/kg; soil, sediment, or solid)
* µg/kg= micrograms per kilogram (µg/kg soil; sediment, or solid)
* kg= kilogram
* mg= milligram
* µg= microgram
* L= liter

Definition of Comparison Values and Health Guidelines

AWQCAmbient Water Quality Criteria are the recommended maximumpermissible pollutant concentrations protective of aquaticorganisms. They are federally enforceable.

CREGCancer Risk Evaluation Guides are derived by ATSDR fromthe EPA Cancer Slope Factor. They represent an estimatedconcentration in water, soil, or air that would beexpected to cause no more than one excess cancer in amillion (10E-6) persons exposed over a lifetime.

CSFA Cancer Slope Factor is usually, but not always, the upper 95th percentile confidence limit of the slope for the dose-response curve. A CSF is developed for a probable or likely carcinogen and is expressed as (mg/kg/day)-1. When data permit, slope factors listed in IRIS are based on absorbed doses, although many of them are based on administered doses.

EMEGEnvironmental Media Evaluation Guides are derived by ATSDRfrom ATSDR's Minimal Risk Levels (MRLs) and factor in bodyweight and ingestion rates. An EMEG is the concentrationof a particular contaminant in water, soil, or air atwhich daily human exposure is unlikely to result inadverse noncarcinogenic effects.

LTHAA Lifetime Health Advisory represents contaminantconcentrations that EPA considers protective ofnoncarcinogenic health effects during a lifetime (70years) of exposure. Drinking water concentrations aredeveloped to predict acceptable exposure levels for bothadults and children when data on a NOAEL or LOAEL existfrom animal or human studies. LTHAs are not enforceablestandards.

MCLMaximum Contaminant Levels represent contaminantconcentrations that EPA deems protective of public health(considering the availability and economics of watertreatment technology) over a lifetime (70 years) at anexposure rate of 2 liters of water per day. MCLs areenforceable standards.

MCLGMaximum Contaminants Level Goal is a proposed,nonenforceable drinking water health goal recommended byEPA and set at a level at which no known or anticipatedadverse human health effects are expected to occur.

MRLA Minimal Risk Level is an estimate of daily humanexposure to a chemical that is likely to be without anappreciable risk of adverse noncancerous effects over aspecified duration of exposure. MRLs are based on humanand animal studies and are reported for acute (< 14 days),intermediate (15-364 days), and chronic (> 365 days)exposures. MRLs are published in ATSDR ToxicologicalProfiles for specific chemicals.

LOAELLowest Observed Adverse Effect Level is the lowestexposure level at which there are statistically orbiologically significant increases in frequency orseverity of adverse health effects between the exposedpopulation and its appropriate control group. LOAELs maybe used to estimate a dose at which people are notexpected to develop adverse health effects. LOAELs arepublished in ATSDR Toxicological Profiles for specificchemicals.

NOAELA No Observed Adverse Effect Level is an exposure level atwhich there are no statistically or biologicallysignificant increases in frequency or severity of adversehealth effects between the exposed population and itsappropriate control group. NOAELs may be used to estimatea dose at which people are not expected to develop adversehealth effects. NOAELs are published in ATSDRToxicological Profiles for specific chemicals.

RfCEPA's Reference Concentration is an estimate of the dailyinhalation exposure to a contaminant (including sensitivesubpopulations) that is unlikely to cause noncanceroushealth effects during a lifetime exposure (chronic RfC) orduring a limited time interval (subchronic RfC).

RfDEPA's Reference Dose is an estimate of the daily oralexposure to a contaminant (including sensitive subgroups)that is unlikely to cause noncancerous health effectsduring a lifetime exposure (chronic RfD) or during alimited time interval (subchronic RfD).

RMEGReference Dose Media Evaluation Guides are derived byATSDR from EPA's Reference Dose (RfD) and factor in bodyweight and ingestion rates. An RMEG is the concentrationof a particular contaminant in water, soil, or air atwhich daily human exposure is unlikely to result inadverse noncarcinogenic effects.


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