Table 7. Arsenic content (parts per million) means, ranges, and standard deviations for samples from coal beds/zones included in the assessment of Northern and Central Appalachian Basin coal regions on an as-received or remnant moisture, whole-coal basis, by county and coal bed/zone for the Commonwealth of Virginia. [nd, no data; no., number.]
County | Coal Bed/Zone | Mean | Minimum | Maximum | Standard Deviation | No. of Samples
Buchanan | Pond Creek | 0.89 | 0.89 | 0.89 | 0.0024 | 2
Buchanan | Pocahontas No. 3 | 12 | 2.7 | 29 | 8.7 | 7
Lee | Campbell Creek/ Upper Elkhorn No. 3 | nd | 2.0 | 2.0 | nd | 1
Lee | Upper Elkhorn Nos. 1 and 2/Powellton | 16 | 1.7 | 23 | 12 | 3
Russell | Pocahontas No. 3 | nd | 2.7 | 2.7 | nd | 1
Tazewell | Pocahontas No. 3 | 4.7 | 3.9 | 5.1 | 1.0 | 3
Wise | Stockton and Coalburg | nd | 2.6 | 2.6 | nd | 1
Wise | Winifrede/Hazard | 2.8 | 2.4 | 3.0 | 0.35 | 3
Wise | Fire Clay | nd | 10 | 10 | nd | 1
Wise | Williamson/Amburgy | 11 | 0.90 | 31 | 17 | 3
Wise | Campbell Creek/ Upper Elkhorn No. 3 | 16 | 1.7 | 85 | 24 | 12
Wise | Upper Elkhorn Nos. 1 and 2/Powellton | 5.9 | 3.2 | 9.9 | 3.5 | 3
Wise | Pond Creek | 6.6 | 1.4 | 21 | 6.3 | 8