Table 2. Arsenic content (parts per million) means, ranges, and standard deviations for 12 top-producing coal beds/zones in the Northern and Central Appalachian Basin coal regions based on 1,343 point data samples [36 samples, which had locations only good to county accuracy, were not included) on an as-received or remnant moisture, whole-coal basis. no., number.]
Region | Mean | Minimum | Maximum | Standard Deviation | No. of Samples
Northern and Central Appalachian | 17 | 0.075 | 280 | 23 | 1,343
Northern Appalachian | 22 | 0.18 | 130 | 22 | 548
Central Appalachian | 14 | 0.075 | 280 | 23 | 795

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