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Table 11. Estimated carbonate rating based on
percent insoluble residue with corresponding acid volumes and
acid strengths. More testing is required by sending samples to
multiple laboratories. 
| Carbonate Rating | Percent Insoluble Residue | Amount Of Acid | Strength Of Acid |
| 0 | 95 - 100 | 20 0 | .1 |
| 1 | 90 - 94 | 40 | 0.1 |
| 2 | 75 - 89 | 40 | 0.5 |
| 3 | < 75 | 80 | 0.5 |
