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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.