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