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Table 1 Estimated Monthly Average Contaminant Concentrations in the Hadnot Point system, 1973 – 1985

From: Mortality study of civilian employees exposed to contaminated drinking water at USMC Base Camp Lejeune: a retrospective cohort study

April 1973* –January 1985**
Contaminant Mean (μg/L) Median (μg/L) Range (μg/L) # Months > MCL # Months >100 μg/L
Tetrachloroethylene 14.9 14.5 0 – 38.7 114 0
Trichloroethylene 355.5 356.6 30.9 – 783.3 142 127
Vinyl Chloride 23.3 20.3 1.0 – 67.3 140 0
Benzene 5.2 4.1 0 – 12.2 63 0
April 1973* – December 1979
Tetrachloroethylene 9.7 9.6 0 – 24.1 56 0
Trichloroethylene 280.4 274.1 30.9 – 546.3 81 69
Vinyl Chloride 14.7 14.3 1.0 – 33.4 79 0
Benzene 3.3 3.2 0 – 5.8 4 0
January 1980 – January 1985*
Tetrachloroethylene 21.8 21.8 2.2 – 38.7 58 0
Trichloroethylene 455.2 449.1 42.6 – 783.3 61 58
Vinyl Chloride 34.7 36.0 4.2 – 67.3 61 0
Benzene 7.7 7.6 1.6 – 12.2 59 0
  1. * First quarter of continuous DMDC quarterly personnel data on DOD employees.
  2. **Contaminated wells were shut down in 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.