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