Table 6. 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 Commonwealth of Pennsylvania. [nd, no data; no., number.]
County | Coal Bed/Zone | Mean | Minimum | Maximum | Standard Deviation | No. of Samples
Allegheny | Pittsburgh | 22 | 5.3 | 33 | 12 | 4
Allegheny | Upper Freeport | nd | 3.3 | 3.3 | nd | 1
Armstrong | Upper Freeport | 32 | 16 | 60 | 13 | 13
Armstrong | Lower Kittanning | 11 | 0.70 | 25 | 9.5 | 5
Beaver | Lower Kittanning | 14 | 0.81 | 21 | 9.3 | 4
Butler | Upper Freeport | 38 | 17 | 56 | 14 | 13
Cambria | Upper Freeport | 34 | 6.8 | 100 | 26 | 12
Cambria | Lower Kittanning | 31 | 0.79 | 90 | 36 | 5
Clarion | Upper Freeport | nd | 46 | 46 | nd | 1
Clarion | Lower Kittanning | 15 | 1.0 | 42 | 15 | 6
Clearfield | Upper Freeport | 74 | 33 | 130 | 37 | 6
Clearfield | Lower Kittanning | 16 | 1.6 | 49 | 14 | 15
Clinton | Lower Kittanning | 6.6 | 0.89 | 15 | 7.6 | 3
Elk | Upper Freeport | 25 | 3.2 | 47 | 31 | 2
Elk | Lower Kittanning | 14 | 0.14 | 79 | 18 | 17
Fayette | Pittsburgh | nd | 0.50 | 0.50 | nd | 1
Fayette | Upper Freeport | 50 | 15 | 97 | 31 | 6
Fayette | Lower Kittanning | 44 | 0.68 | 66 | 30 | 4
Greene | Pittsburgh | 2.7 | 0.46 | 11 | 3.4 | 10
Greene | Upper Freeport | nd | 26 | 26 | nd | 1
Greene | Lower Kittanning | 0.64 | 0.35 | 1.1 | 0.41 | 3
Indiana | Pittsburgh | nd | 6.5 | 6.5 | nd | 1
Indiana | Upper Freeport | 27 | 0.73 | 130 | 19 | 95
Indiana | Lower Kittanning | 18 | 0.30 | 74 | 26 | 7
Jefferson | Upper Freeport | 50 | 31 | 71 | 16 | 6
Jefferson | Lower Kittanning | 13 | 1.0 | 42 | 15 | 7
Lawrence | Upper Freeport | nd | 8.2 | 8.2 | nd | 1
Lawrence | Lower Kittanning | 16 | 0.96 | 30 | 15 | 3
Somerset | Pittsburgh | 1.9 | 0.33 | 10 | 3.2 | 9
Somerset | Upper Freeport | 38 | 2.0 | 110 | 34 | 16
Somerset | Lower Kittanning | 15 | 0.65 | 48 | 16 | 8
Washington | Pittsburgh | 20 | 0.55 | 61 | 18 | 10
Washington | Upper Freeport | nd | 30 | 30 | nd | 1
Westmoreland | Pittsburgh | nd | 3.2 | 3.2 | nd | 1
Westmoreland | Upper Freeport | 22 | 8.3 | 41 | 13 | 6
Westmoreland | Lower Kittanning | nd | 16 | 16 | nd | 1

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