Occupational Exposure Support

PMG delivers accurate and facility-specific mercury mass flux models, ensuring representative partitioning throughout your operations. Our strategies are customized based on project-specific goals, taking into account budget, process conditions, data requirements, and facility operations. With state-of-the-art equipment and unparalleled expertise, we provide a comprehensive understanding of mercury distribution, allowing for informed decision-making and compliance.

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Introduction

The overarching objective of PMG’s EHS monitoring plan is often to monitor and prevent the exposure of project personnel to contaminants of concern (primarily elemental mercury vapors) at concentrations above health and safety guidelines (OSHA, ACGIH, NIOSH) consistent with a project specific H&S plan.  Implementation of a project EHS plan results in the collection of mercury vapor concentrations in project work zones, including but not limited to the following:

  1. Personnel breathing zone mercury vapor concentrations during activity in the contamination zone 
  2. Ambient air mercury vapor concentrations in the Contaminant Reduction Zone (a demarked area at ground level that included mechanical equipment, work support equipment, other materials and waste handling containers)
  3. Monitoring of equipment and materials entering and exiting the Contaminant reduction zone (CRZ) and Exclusion Zone (EZ), PPE exiting the EZ, and more.  

Data collection includes the following primary key data and information fields:

  • Date
  • Confined space 
  • Type of work being performed
  • PPE Level
  • Work shift entry/exit times
  • Maximum and minimum mercury vapor concentration measured during each shift
  • TWA mercury concentration during each shift (duration in confined space)
  • TWA mercury concentration normalized to 8-hrs
  • Indication of points where mercury vapor concentrations exceeded EHS criteria (ACGIH TLV, TWA, and OSHA Ceiling Limit)

At the conclusion of a project, a detailed report is provided to serve as an overview of the working conditions (with respect to mercury vapors).  This report provides two series of tabularized mercury vapor monitoring results summarized daily along with a description of work tasks and level of PPE employed.  The two series of summary tables consist of:

  1. Exclusion Zone Monitoring 
  2. Contaminant Reduction Zone Monitoring 

This report includes:

  • Compiled, organized and paired occupational exposure data with tasks that were performed 
  • Calculated time weighted averages (TWAs) for occupational exposure data 
  • Tabulated perimeter monitoring data tables
  • Summary tables of all monitoring data
  • Key findings, interpretations, and observations