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Table 1 Estimated monthly average contaminant concentrations in the Tarawa Terrace 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 (132 months)

Contaminant

Mean (μg/L)

Median (μg/L)

Range (μg/L)

# Months >MCL

# Months >100 μg/L

Tetrachloroethylene

75.7

84.9

0 – 158.1

117

16

Trichloroethylene

3.1

3.5

0 – 6.6

11

0

Vinyl chloride

5.6

6.2

0 – 12.3

117

0

1975 – 1979 (60 months)

Tetrachloroethylene

68.3

68.2

43.8 – 94.8

60

0

Trichloroethylene

2.8

2.9

1.7 – 3.9

0

0

Vinyl chloride

5.2

5.5

2.6 – 7.3

60

0

January 1980 – January 1985 (61 months)*

Tetrachloroethylene

96.1

95.5

0¥ – 158.1

57

16

Trichloroethylene

3.9

3.9

0¥ – 6.6

11

0

Vinyl chloride

7.0

7.0

0¥ – 12.3

57

0

  1. *Two contaminated wells were shut down in January 1985. Estimated monthly average tetrachloroethylene levels from February through December 1985 were <4 μg/L.
  2. ¥One contaminated well was shut down for maintenance during 7/80 – 8/80 and 1/83 – 2/83. The other contaminated well was not in use until August 1984.