Topic: Low-Flow Purging and Sampling and No-Purge 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 and no-purge 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 series of two modules comprehensively covers the topics of low-flow purging and sampling and the newer methodology referred to as no-purge sampling, and explains why and how low-flow purging and sampling and no-purge sampling always produce dramatically improved and more consistent sampling results and significant cost savings.  Field videos are included within these modules to help explain the practices and procedures required to implement low-flow purging and sampling and no-purge sampling.  While you may opt to take just one of these modules, it is strongly recommended that you take both modules in the prescribed order if you want comprehensive coverage of the subject.

Module GWM–23 (Total Length: 58 Minutes) Price: $159.00 Sign in to Your E-School Account to Register

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 Module GWM-23: 1.0 CEU

Module GWM–24 (Total Length: 40 minutes) Price: $159.00  Sign in to Your E-School Account to Register

Practices and Procedures for No-Purge Sampling

• Fundamental Concepts – What it is, How it Works
• Understanding the Concept of Equilibrated Grab Samplers
• Equipment Used for No-Purge Sampling
• Procedures Used for No-Purge Sampling
• Advantages and Limitations of No-Purge Sampling

Total CEUs for Module GWM-24: 1.0 CEU

Topic: Field Parameter Measurement During Well Purging

Measurement of field water-quality indicator parameters is a fundamental component of most conventional purging and all low-flow purging and sampling approaches to collecting ground-water samples from monitoring wells.  This module explains how to correctly measure the most common water-quality indicator parameters (including pH, specific conductance, dissolved oxygen and redox potential) and physical parameters (temperature and turbidity) used in conjunction with purging wells to ensure the collection of accurate data.  You will learn which parameters to measure to achieve sampling program objectives and how to identify when field data do not make sense, and what the cause(s) may be.  Field videos are included in this module to explain the practices and procedures used for field parameter measurement.

Module GWM–25 (Total Length: 71 minutes) Price: $159.00 Sign in to Your E-School Account to Register

Field Water-Quality Indicator Parameter Measurement During Well Purging

• Parameters Traditionally Measured and Why They May Not All be Meaningful
• Which Are the Most Meaningful Parameters to Measure During Purging and Why
• Turbidity – to Measure or Not to Measure During Purging?
• How and Where to Measure Field Water-Quality Parameters
• Instrument and Sensor Options for Field Water-Quality Data Measurement
• Common Problems in Field Parameter Measurement and Solutions to Those Problems
• Evaluating the Need to Measure Field Parameters During No-Purge Sampling

Total CEUs for Module GWM-25: 1.2 CEUs