Table 4. 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 whole-coal basis, by county and coal bed/zone for the State of Maryland. [nd, no data; no., number.]
Coal Bed/Zone | County | Mean | Minimum | Maximum | Standard Deviation | No. of Samples
Allegany | Pittsburgh | nd | 2.7 | 2.7 | nd | 1
Garrett | Upper Freeport | 32 | 4.3 | 90 | 24 | 13
Garrett | Lower Kittanning | 16 | 15 | 16 | 0.66 | 2

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