# Improving and Eliminating Regulations; Calibration and Maintenance Procedures for Coal Mine Respirable Dust Samplers
> **US Department of Labor** · Final rule; technical amendment. · Published 1999-08-10 · Effective 1999-10-12 · 64 FR 43283
## Document
- **Document number:** 99-20409
- **Category:** other
- **Sub-agency:** US Department of Labor
- **Federal Register citation:** 64 FR 43283
- **CFR reference:** 30 CFR 70
- **Publication date:** 1999-08-10
- **Effective date:** 1999-10-12
## Abstract

We (MSHA) have revised and updated our Informational Report No. 1121 (IR 1121) to include currently approved sampling equipment and to permit the use of fast-response calibrators having a volumetric tube. The updated document is Informational Report No. 1240 (IR 1240) entitled, ``Calibration and Maintenance Procedures for Coal Mine Respirable Dust Samplers.'' This final rule updates the existing incorporation-by-reference of IR 1121 in MSHA's coal mine respirable dust standards to reference IR 1240.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/08/10/99-20409/improving-and-eliminating-regulations-calibration-and-maintenance-procedures-for-coal-mine)
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