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Table 2 Estimated monthly average contaminant concentrations in the Hadnot Point system, 1975 – 1985

From: Evaluation of mortality among marines and navy personnel exposed to contaminated drinking water at USMC base Camp Lejeune: a retrospective cohort study

1975 – 1985

Contaminant

Mean (μg/L)

Median (μg/L)

Range (μg/L)

# Months >MCL

# Months >100 μg/L

Tetrachloroethylene

15.7

15.4

0 – 38.7

111

0

Trichloroethylene

358.7

365.9

0 – 783.3

122

113

Vinyl chloride

24.0

22.2

0 – 67.3

122

0

Benzene

5.4

4.6

0 – 12.2

63

0

1975 – 1979

Tetrachloroethylene

12.2

12.0

1.4 – 24.1

53

0

Trichloroethylene

325.1

327.7

60.6 – 546.3

60

55

Vinyl chloride

17.3

16.5

2.3 – 33.4

60

0

Benzene

3.5

3.4

0 – 5.8

4

0

January 1980 – February 1985*

Tetrachloroethylene

21.5

21.4

2.2 – 38.7

58

0

Trichloroethylene

449.2

446.2

42.6 – 783.3

62

58

Vinyl chloride

34.3

35.7

4.2 – 67.3

62

0

Benzene

7.6

7.6

1.6 – 12.2

59

0

  1. *Contaminated wells were shut down after February 1985. From March through December 1985, estimated monthly average levels of trichloroethylene, tetrachloroethylene and vinyl chloride were <1 μg/L, and benzene was <4 μg/L.
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Environmental Health

ISSN: 1476-069X