Geotechnical Investigation NCTC Stormwater Management Pond

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Presentation transcript:

Geotechnical Investigation NCTC Stormwater Management Pond

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.

SCOPE OF WORK Limited Geophysical Study Air-Track Probe Investigation

SITE PLAN

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

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

SITE INVESTIGATION LAYOUT

2-D RESISTIVITY SECTIONS

2-D RESISTIVITY SECTIONS

2-D RESISTIVITY SECTIONS

ATP LOG

SITE COMPILATION (Swiss Cheese)

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.

GEOPHYSICAL SURVEYS IN KARST TERRAIN