AASHTO Designation: R 21-96 (2004) pdf free download

Standard  Recommended   Practice  for

Drilling for Subsurface Investigations•

Unexpectedly  Encountering Suspected

Hazardous Material

AASHTO Designation: R 21-96 (2004)


AASHTO Designation: R 21-96 (2004) pdf free download

1.1.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. 1

1.2.This standard may involve hazardous materials, operations,  and equipment.

 This standard does not purport to address all of the safety concerns associated with its use.

 It is the responsibility of the user of this procedure to establish appropriate safetyand  health practices and to determine the applicability of regulatory

limitations prior to use.


2.1. AASHTO Standard and Publication:

Click below to download AASHTO Designation: R 21-96 (2004) pdf free

Click here to download  AASHTO Designation:R 20-99 (2008) pdf free download

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