Criteria | Risk Level (Assigned Points) | ||||
1 | 2 | 3 | 4 | ||
(Low Risk) | (High Risk) | ||||
Geology | 1. Depth to bedrock (m) | >15 | 10 - 15 | 5 - 10 | <5 |
2. Soil Raveling Potential | CH | NH/CL | SC/SM/ML | SP/SW | |
3. Soil Desiccation Potential | SP/SW | SC/SM/ML | MH/CL | CH | |
4. Potential for Boulders | - | No Cap rock | - | Cap rock | |
5. Fracturing of top 5m of Rock | Unfractured | Slightly Fractured | Moderate Fractured | Highly Fractured | |
6. Voids and Fissures in Soil | - | No | - | Yes | |
7. Depth of Void (m) | >15 | 10 - 15 | 5 - 10 | <5 | |
8. Proximity of Voids (m) | >30 | 15 - 30 | 3 - 15 | <3 | |
9. History of Sinkholes, within 30 m | - | - | - | Yes | |
10. Shear Wave Velocity (m/sec) | >400 | 250 - 400 | 150 - 250 | <150 | |
11. Decrease in Shear Wave Velocity (m/sec) | <70 | 70 - 140 | 140 - 250 | >250 | |
12. Bedrock Orientation | Horizontal | Slight Dip | Moderate Dip | Steep Dip | |
Groundwater | 13. Depth to Groundwater (m) | >15 | 10 - 15 | 5 - 10 | <5 |
14. Groundwater Pumping History | Never | Stopped | Deep | Shallow | |
15. Groundwater Flow in Voids | - | No | - | Yes | |
Surface Water & Infiltration | 16. Pipe Leak, within 30 m | No | - | - | Yes |
17. Process Water Discharge, within 30 m | - | - | - | Yes | |
18. Storm water Ponding, within 30 m | - | - | - | Yes | |
Site Features | 19. Buried Structures, within 30 m | - | - | - | Yes |
20. Soil Disturbance, within 30 m | - | - | - | Yes | |
21. Impervious Surfaces, within 30 m | No | - | - | Yes | |
General | 22. Data Coverage | Extensive | Some | Limited | Sparse |