1. Geotechnical Investigation NCTC Stormwater Management Pond

3. Actual Quotes Regarding Geophysical Survey Results
What do you call this stuff, Voodoo Engineering?
Although I don’t know what it all means, the sections look pretty!
So what color is bad, red or blue?
I like the colored pictures more than the engineering technical mumbo-jumbo in the report.

4. SCOPE OF WORK
Limited Geophysical Study
Air-Track Probe Investigation

5. SITE PLAN

6. SITE HISTORY GEOLOGIC SETTING
Previously filled sinkholes (concrete, soil and rock)
Ravelling and subsidence continuing of sinkholes
GEOLOGIC SETTING
Conococheaque formation of Upper Cambrian Age

7. FIELD INVESTIGATION Phase 1 – Electrical Resistivity Imaging
Phase 2 – Air-track Probes

8. SITE INVESTIGATION LAYOUT

9. 2-D RESISTIVITY SECTIONS

10. 2-D RESISTIVITY SECTIONS

11. 2-D RESISTIVITY SECTIONS

12. ATP LOG

13. SITE COMPILATION
(Swiss Cheese)

14. RECOMMENDATIONS Two options:
Repair existing sinkholes with a reverse graded filter and a clay cap. Risk of future maintenance costs associated with any additional sinkholes that may develop beyond the repaired area.
Repair existing sinkholes as noted above and install a geosynthetic liner. Best long-term solution.

15. GEOPHYSICAL SURVEYS IN KARST TERRAIN