Topic: Low-Flow Purging and Sampling

Traditional ground-water sample collection methods, including well-volume purging and sampling and purging a well to dryness, are subject to significant sources of  bias and error that commonly result in either over- or under-estimation of actual sample concentrations and poor precision and accuracy.  It is thus exceedingly important to use more up-to-date methods, like low-flow purging and sampling, that have been demonstrated by many field research studies to produce higher quality samples so all stakeholders can have much higher confidence in sample analytical results.  This module comprehensively covers the topic of low-flow purging and sampling, and explains why and how low-flow purging and sampling always produces dramatically improved and more consistent sampling results AND significant cost savings.  Field videos are included within this module to help explain the practices and procedures required to implement low-flow purging and sampling.

Module GWM–23 (Total Length: 58 Minutes) Price: $159.00 Register Now

Practices and Procedures for Low-Flow Purging and Sampling

  • Fundamental Concepts – What it is, How it Works
  • Discussion of ASTM Standard D 6771 on Low-Flow Purging and Sampling
  • Requirements for Equipment and Flow Rates
  • Well Hydraulics During Low-Flow Purging and Sampling
  • Procedures Used and Avoiding Common Errors in the Field
  • Dedicated vs. Portable Equipment Considerations
  • Advantages and Limitations of Low-Flow Purging and Sampling

Total CEUs for GWM-23: 1 CEU