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Redrilling seismic shotholes to protect groundwater

Summary A regional administrator asked whether previously loaded seismic shotholes could be redrilled so they could be plugged against groundwater contamination. OSHA said remote drilling with the operator at a safe distance could be appropriate where no employees were exposed. It would not allow or recommend redrilling when employees could face an explosive hazard.
Document
Federal guidance
Agency
Occupational Safety and Health Administration (OSHA)
Document number
1984-10-22
Date issued
October 22, 1984
Status
Active
Status last verified October 10, 2026

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About this page: The full text below is the official document from Occupational Safety and Health Administration (OSHA). Ezel adds the plain-English summary and tracks the document's status. The official source linked on this page is authoritative for any reliance.

October 22, 1984

MEMORANDUM FOR: BYRON R. CHADWICK, Regional Administrator
FROM: JOHN B. MILES, JR., Director, Directorate of Field Operations
SUBJECT: Redrilling Seismic Shotholes For The Purpose of Plugging the Hole to Protect Groundwater

This is in response to your memorandum requesting clarification on the above subject. We are of the opinion that a drill using a remote operator at a safe distance where there would be no exposure to any employees would be appropriate.

This would allow the proper plugging of these holes to the underground water from being contaminated.

The redrilling of any holes which have contained explosives cannot be allowed or recommended by OSHA, where employees could be exposed to a hazard.

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