| Code |
Description |
| A |
Reported by another government agency (do not use "A" if reported by owner, use "O"). |
| D |
From driller's log or report. |
| G |
Private geologist-consultant or university associate. |
| L |
Depth interpreted from geophysical logs by personnel of source agency. |
| M |
Memory (owner, operator, driller). |
| O |
Reported by owner of well. |
| R |
Reported by person other than the owner, driller, or another government agency. |
| S |
Measured by personnel of reporting agency. |
| U |
Source is unknown. |
| Z |
Other source (explain in remarks). |
