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Table 6. NP values (metric tons per 1000
metric tons) using the Sobek Hand Method (without using H2O2)
from three laboratories (WVU, PADEP, and CONSOL) on 31 overburden
samples. Fizz ratings were determined independently by each
laboratory1. 
WVU PADEP CONSOL Difference
| Sample | Fizz | NP | Fizz | NP | Fizz | NP | High - Low |
| Fe | |||||||
| 1 | 1 | 70 | 1 | 89 | 0 | 29 | 60*2 |
| 2 | 1 | 62 | 1 | 88 | 0 | 25 | 63* |
| 3 | 1 | 63 | 1 | 87 | 0 | 14 | 73* |
| 4 | 1 | 62 | 1 | 93 | 3 | 445 | 383* |
| 5 | 1 | 64 | 1 | 82 | 0 | 26 | 56* |
| 6 | 2 | 367 | 3 | 607 | 3 | 363 | 244* |
| Ca | |||||||
| 1 | 3 | 926 | 3 | 928 | 3 | 936 | 10 |
| 2 | 3 | 835 | 2 | 500 | 3 | 837 | 337* |
| 3 | 3 | 711 | 3 | 743 | 3 | 724 | 32 |
| S | |||||||
| 1 | 0 | -23 | 0 | -39 | 0 | -27 | 16 |
| 2 | 1 | 78 | 0 | 44 | 0 | 77 | 34* |
| 3 | 0 | 17 | 1 | 80 | 0 | 23 | 63* |
| 4 | 0 | -1 | 0 | -1 | 0 | -1 | 0 |
| 5 | 0 | 23 | 1 | 25 | 0 | 4 | 21* |
| Si | |||||||
| 1 | 0 | 5 | 0 | 11 | 0 | 7 | 6 |
| 2 | 0 | 2 | 0 | 6 | 0 | 4 | 4 |
| 3 | 0 | 2 | 0 | 5 | 0 | 3 | 3 |
| 4 | 0 | 15 | 1 | 32 | 0 | 17 | 15* |
| 5 | 2 | 64 | 1 | 61 | 0 | 54 | 10* |
| 6 | 0 | -1 | 0 | 5 | 0 | 0 | 6 |
| 7 | 0 | -5 | 0 | 1 | 0 | -3 | 6 |
| 8 | 0 | -7 | 0 | 1 | 0 | -5 | 8 |
| 9 | 0 | -2 | 0 | 1 | 0 | -4 | 5 |
| 10 | 0 | 18 | 0 | 14 | 0 | 20 | 6 |
| 11 | 1 | 40 | 1 | 73 | 0 | 22 | 51* |
| 12 | 0 | 23 | 0 | 36 | 0 | 15 | 21 |
| 13 | 2 | 113 | 3 | 155 | 0 | 122 | 42* |
| 14 | 0 | 7 | 0 | 12 | 0 | 7 | 5 |
| 15 | 1 | 23 | 1 | 40 | 0 | 6 | 34* |
| 16 | 0 | 17 | 1 | 62 | 1 | 27 | 45* |
| 17 | 1 | 88 | 1 | 95 | 1 | 50 | 45 |
mean difference = 55.0
1All the labs digested samples according to fizz ratings and corresponding strengths and volumes of HCl (Table 2).
2Indicates that the laboratories assigned a different fizz rating to this sample.
