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HEALTH CONSULTATION

Review of Groundwater Data

SIGMON'S SEPTIC TANK SERVICE FACILITY
(a/k/a SIGMON'S SEPTIC TANK SERVICE)
STATESVILLE, IREDELL COUNTY, NORTH CAROLINA


APPENDIX B: TABLES

TABLE 1.

Drinking Water Comparison Values Table for Sigmon's Septic Tank Service Site
(Detected Chemical Concentrations found in On-Site Groundwater Monitoring Wells between 1987 -- 1999)
CHEMICAL SUBSTANCE CHEMICAL CONCENTRATIONS (ppb) WATER COMPARISON VALUES (PPB)
Acute EMEGs
( < 14 days)

Intermediate EMEGs
(14 < ___ < 365 days)
Chronic
( > 365 days)
EPA MCL
Detected Concentrations
Range Mean Median Non-carcinogenic Carcinogenic
Adult Child Adult Child Adult Child
INORGANIC MOITIES
Chloride1

3,000 -- 24,000

11,667

8,000

                   

250,000

Nitrates

70 -- 54,000

23,914

7,300

       

60,000

RMEG

20,000

RMEG

   

10,000

Sulfates1

8,000 -- 11,000

9,333

9,000

                   

250,000

METALS
Aluminum

12,000 -- 120,000

64,667

62,000

   

70,000

20,000

37,000

RBC

16,000

RBC

     
Arsenic

4.2

4.2

4.2

200

50

   

10

EMEG

3

EMEG

0.02

CREG

50

Barium

590 -- 6,600

2,051

710

       

2,000

RMEG

700

RMEG

   

2,000

Calcium

29,000 -- 50,000

37,333

33,000

                     
Chromium

20 -- 86

59

65

       

100

LTHA

       

100

Cobalt

39

39

39

       

730

RBC

310

RBC

      
Copper2

17 -- 82

39.25

29

       

1,500

RBC

630

RBC

   

1,300

Iron1

100 -- 87,000

21,886

10,050

       

22,000

RBC

9,400

RBC

   

300

Lead2

12 -- 210

95

75

                   

15

Magnesium

13,000 -- 64,000

34,000

29,500

                     
Manganese1

430 -- 27,000

13,014

15,500

       

2,000

RMEG

500

RMEG

   

50

Mercury5

0.2 -- 670

119

6.3

   

70

20

10

RMEG

3

RMEG

   

2

Nickel

73

73

73

       

700

RMEG

200

RMEG

     
Potassium

5,600 -- 24,000

14,650

14,500

                     
Sodium3

3,100 -- 57,000

34,033

37,000

                   

20,000

Zinc1

42 -- 400

164

107

   

10,000

3,000

10,000

EMEG

3,000

EMEG

   

5,000

ORGANIC COMPOUNDS
Acetone

29 -- 76

52.5

52.5

   

70,000

20,000

10,000

RMEG

3,000

RMEG

     
Benzene

2 -- 3

2.43

2.3

       

11

RBC

4

RBC

0.6

CREG

5

n-Butylbenzene

1.6

1.6

1.6

       

240

RBC

89

RBC

     
Chlorobenzene

0.81 -- 72

29.33

22.25

   

10,000

4,000

700

RMEG

200

RMEG

   

100

Chloroethane

1

1

1

       

8,600

RBC

3,400

RBC

36

RBC

 
2-Chlorotoluene

2

2

2

       

700

RMEG

200

RMEG

     
1,2-Dichlorobenzene

0.28 -- 13

6.37

6.1

       

3,000

RMEG

900

RMEG

   

600

1,3-Dichlorobenzene

0.38 -- 1

0.69

0.69

       

600

LTHA

         
1,4-Dichlorobenzene

3 -- 11

6.78

6.1

   

10,000

4,000

75

LTHA

   

0.47

RBC

75

1,1-Dichloroethane

0.28 -- 5

1.76

1

       

800

RBC

300

RBC

     
cis-1,2-Dichloroethene

0.51 -- 3

1.95

2.15

40,000

10,000

10,000

3,000

61

RBC

22

RBC

   

70

Ethylbenzene

0.2 -- 4

2.1*

2.1*

       

4,000

RMEG

1,000

RMEG

   

700

Methylene Chloride

1

1*

1*

7,000

2,000

   

2,000

EMEG

600

EMEG

5

CREG

5

4-Methyl-2-Pentanone (Methyl Isobutyl Ketone)

1

1

1

       

140

RBC

50

RBC

     
Naphthalene

3.1

3.1

3.1

2,000

500

700

200

700

RMEG

200

RMEG

     
Phenol

3 -- 5

4

4

       

20,000

RMEG

6,000

RMEG

     
Toluene

2

2*

2*

30,000

8,000

700

200

750

RBC

270

RBC

   

1,000

Trichloroethene (TCE)

0.25

0.25

0.25

7,000

2,000

   

37

RBC

13

RBC

1.6

RBC

5

1,3,5-Trimethylbenzene

1

1

1

       

120

RBC

44

RBC

     
Vinyl Chloride

2

2

2

       

0.7

EMEG

0.2

EMEG

0.03

CREG

2

Xylenes

2 -- 6

3.53*

3.05*

   

7,000

2,000

10,000

LTHA

4,500

RBC

   

10,000

Notes:

Shading indicates the comparison values that are exceeded by the maximum detected chemical level.

CREG

=

Cancer Risk Evaluation Guide

EMEG

=

Environmental Media Evaluation Guide

LTHA

=

Drinking Water Lifetime Health Advisory

MCL

=

Maximum Contaminant Level

RBC

=

Risk Based Concentration (Note, RBC values derived from equations documented in following reference: EPA Region III Risk-Based Concentration Table. United States Environmental Protection Agency, Region III, 841 Chestnut Street, Philadelphia, PA, 19107. Available on EPA Region IIIís Internet website, http://www.epa.gov/reg3hwmd/risk/ , Background Information - [PDF])

RMEG

=

Reference Dose Media Evaluation Guide

NA

=

None Available

ppb

=

parts per billion

*Average and Median concentrations may be different than displayed in table since some detections were below the quantitation limit for the analyzed chemical (i.e., no value given in inspection/sampling report).

1Listed value in "EPA MCL" column is a Secondary Maximum Contaminant Level (SMCL) for drinking water as set by EPA. SMCLs are unenforceable federal guidelines regarding taste, odor, color, and other non-aesthetic effects of drinking water. EPA recommends them to States as reasonable goals, but federal law does not require water supply systems to comply with them. States may, however, adopt their own enforceable regulations governing these concerns.

2Listed value in "EPA MCL" column is a Maximum Contaminant Level Action (MCLA) for drinking water as set by EPA under Superfund. If the relevant action level is exceeded, a regulatory response is triggered.

3Listed value in "EPA MCL" column is a Drinking Water Equivalent Level (DWEL). The drinking water standard is based on EPA's oral RfD and represent corresponding concentrations of a substance in drinking water that are estimated to have negligible deleterious effects in humans at an intake rate of 2 L/day, assuming that drinking water is the sole source of exposure; however, the listed standard for Sodium is only to be used as a guideline, similar to the Secondary Maximum Contaminant Levels.

5Listed comparison values for inorganic mercury, except for EPA's MCL, are based on studies of animals administered high doses of mercuric chloride [ATSDR 1999a, NTP 1993, Druet et al. 1978, Bernaudin et al. 1981, Andres 1984].


Table 2.

Drinking Water Comparison Values Table for Sigmon's Septic Tank Service Site
(Detected Chemical Concentrations found in Off-Site Groundwater Monitoring Well during 1997)
CHEMICAL SUBSTANCE CHEMICAL CONCENTRATIONS (ppb) WATER COMPARISON VALUES (PPB)
Acute EMEGs
( < 14 days)

Intermediate EMEGs
(14 < ___ < 365 days)
Chronic
( > 365 days)
EPA MCL
Detected Concentrations
Range Mean Median Non-carcinogenic Carcinogenic
Adult Child Adult Child Adult Child
ORGANIC COMPOUNDS
Acetone

31

31

31

   

70,000

20,000

10,000

RMEG

3,000

RMEG

     
Notes:

CREG

=

Cancer Risk Evaluation Guide

EMEG

=

Environmental Media Evaluation Guide

LTHA

=

Drinking Water Lifetime Health Advisory

MCL

=

Maximum Contaminant Level

RBC

=

Risk Based Concentration (Note, RBC values derived from equations documented in following reference: EPA Region III Risk-Based Concentration Table. United States Environmental Protection Agency, Region III, 841 Chestnut Street, Philadelphia, PA, 19107. Available on EPA Region IIIís Internet website, http://www.epa.gov/reg3hwmd/risk/ , Background Information - [PDF])

RMEG

=

Reference Dose Media Evaluation Guide

NA

=

None Available

ppb

=

parts per billion


Table 3.

Drinking Water Comparison Values Table for Sigmon's Septic Tank Service Site
(Detected Chemical Concentrations found in Private Well PW2 between 1991 -- 1999)
CHEMICAL SUBSTANCE CHEMICAL CONCENTRATIONS
(ppb)
WATER COMPARISON VALUES
(ppb)
FURTHER PUBLIC HEALTH EVALUATION REQUIRED
Acute EMEGs Intermediate EMEGs
(14 < ___ < 365 days)
Chronic
( > 365 days)
EPA MCL
Detected Concentrations
Non-carcinogenic Carcinogenic
Range Mean Median Adult Child Adult Child Adult Child
INORGANIC MOITIES
Nitrates

10,000 -- 23,350

14,670

13,000

       

60,000

RMEG

20,000

RMEG

   

10,000

YES
METALS
Barium

140 -- 400

282

270

       

2,000

RMEG

700

RMEG

   

2,000

NO
Calcium

21,000 -- 95,000

58,000

58,000

                      NA
Cobalt

2.4 -- 2.6

2.5

2.5

       

730

RBC

310

RBC

      NO
Copper2

14 -- 39

28.67

33

       

1,500

RBC

630

RBC

   

1,300

NO
Iron1

80 -- 5,500

1,900

120

       

22,000

RBC

9,400

RBC

   

300

YES
Lead2

3 -- 4.4

3.7

3.7

                   

15

NO
Magnesium

4,500 -- 12,000

8,833

10,000

                      NA
Manganese1

66 -- 260

161.2

140

       

2,000

RMEG

500

RMEG

   

50

YES
Mercury5

1.1 -- 7

1.9

1.3

   

70

20

10

RMEG

3

RMEG

   

2

YES
Nickel

2.3 -- 4.2

3.25

3.25

       

700

RMEG

200

RMEG

      NO
Potassium

2,800 -- 7,000

4,833

4,700

                      NA
Sodium3

5,300 -- 15,000

10,150

10,150

                   

20,000

NO
Zinc1

28 -- 2,500

853.00

31.00

   

10,000

3,000

2,000

EMEG

500

EMEG

   

5,000

NO
ORGANIC COMPOUNDS
Acetone

99

99

99

   

70,000

20,000

10,000

RMEG

3,000

RMEG

      NO
1,2-Dichlorobenzene

0.3

0.3*

0.3*

       

3,000

RMEG

900

RMEG

   

600

NO
1,4-Dichlorobenzene

0.27 -- 1.5

0.73*

0.6*

   

10,000

4,000

75

LTHA

   

0.47

RBC

75

YES
1,1-Dichloroethane

0.5 -- 1.5

0.83*

0.6*

       

800

RBC

300

RBC

      NO
1,2-Dichloroethane

0.53

0.53

0.53

   

7,000

2,000

10

RBC

3.6

RBC

0.4

CREG

5

YES
cis-1,2-Dichloroethene

0.8 -- 3.5

2.2*

2*

40,000

10,000

10,000

3,000

61

RBC

22

RBC

   

70

NO
Tetrachloroethene (PCE)

0.29 -- 0.53

0.41*

0.41*

2,000

500

   

400

RMEG

100

RMEG

1.1

RBC

5

NO
Trichloroethene (TCE)

0.35 -- 0.89

0.62*

0.62*

7,000

2,000

   

37

RBC

13

RBC

1.6

RBC

5

NO
Xylenes

5.1

5.1*

5.1*

   

7,000

2,000

10,000

LTHA

4,500

RBC

   

10,000

NO

Notes:

A chemical is selected for further public health evaluation if the maximum detected chemical level exceeds at least one of its comparison values. Shading indicates the comparison values that are exceeded.

CREG

=

Cancer Risk Evaluation Guide

EMEG

=

Environmental Media Evaluation Guide

LTHA

=

Drinking Water Lifetime Health Advisory

MCL

=

Maximum Contaminant Level

RBC

=

Risk Based Concentration (Note, RBC values derived from equations documented in following reference: EPA Region III Risk-Based Concentration Table. United States Environmental Protection Agency, Region III, 841 Chestnut Street, Philadelphia, PA, 19107. Available on EPA Region IIIís Internet website, http://www.epa.gov/reg3hwmd/risk/ , Background Information - [PDF])

RMEG

=

Reference Dose Media Evaluation Guide

NA

=

None Available

ppb

=

parts per billion

*Average and Median concentrations may be different than displayed in table since some detections were below the quantitation limit for the analyzed chemical (i.e., no value given in inspection/sampling report).

1Listed value in "EPA MCL" column is a Secondary Maximum Contaminant Level (SMCL) for drinking water as set by EPA. SMCLs are unenforceable federal guidelines regarding taste, odor, color, and other non-aesthetic effects of drinking water. EPA recommends them to States as reasonable goals, but federal law does not require water supply systems to comply with them. States may, however, adopt their own enforceable regulations governing these concerns.

2Listed value in "EPA MCL" column is a Maximum Contaminant Level Action (MCLA) for drinking water as set by EPA under Superfund. If the relevant action level is exceeded, a regulatory response is triggered.

3Listed value in "EPA MCL" column is a Drinking Water Equivalent Level (DWEL). The drinking water standard is based on EPA's oral RfD and represent corresponding concentrations of a substance in drinking water that are estimated to have negligible deleterious effects in humans at an intake rate of 2 L/day, assuming that drinking water is the sole source of exposure; however, the listed standard for Sodium is only to be used as a guideline, similar to the Secondary Maximum Contaminant Levels.

5Listed comparison values for inorganic mercury, except for EPA's MCL, are based on studies of animals administered high doses of mercuric chloride [ATSDR 1999a, NTP 1993, Druet et al. 1978, Bernaudin et al. 1981, Andres 1984].



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