Geotechnical investigation nctc stormwater management pond
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Geotechnical Investigation NCTC Stormwater Management Pond PowerPoint PPT Presentation


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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?

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Geotechnical Investigation NCTC Stormwater Management Pond

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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

  • 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


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