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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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