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AASHTO R 21-96 (2015)
- Standard Practice for Drilling for Subsurface Investigations---Unexpectedly Encountering Suspected Hazardous Material
- standard by American Association of State and Highway Transportation Officials, 1996
- Publisher: AASHTO
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This practice is intended to help protect drillers in the event they unexpectedly encounter suspected hazardous materials while performing subsurface investigations. This is accomplished by training the drillers, identifying precautions to minimize risks of contamination, and establishing a procedure to follow if suspected hazardous material is encountered.
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