Topic: Selection and Operation of Ground-Water Purging & Sampling Devices

There are a lot more useful and appropriate purging and sampling device options available than the bailer!  Learn what types of sampling devices are appropriate for a variety of analytical parameters, and which devices should never be used for some parameters. This series of 2 modules provides a detailed discussion of a wide range of devices available for purging and sampling ground-water monitoring wells, including their principles of operation, operational characteristics, materials of construction, and limitations.  The discussion will provide a framework for evaluating any device to determine its suitability and appropriateness for site-specific and individual well-specific applications.  Field videos are included within each module to explain the operation and use of a variety of sampling devices.  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–20 (Total Length: 42 minutes) Price: $159.00 Sign in to Your E-School Account to Register

Purging and Sampling Device Selection Criteria; Operational Characteristics, Applications and Limitations of Grab Samplers, Suction-Lift Pumps & Electric Centrifugal Submersible Pumps

• Purging and Sampling Device Selection Criteria
• Discussion of ASTM Standard D 6634 on Selection of Purging and Sampling Devices for Ground-Water Monitoring Wells
• Impacts of Sampling Devices on Sample Chemistry
• Overview of Available Sampling Devices -  Operational Characteristics and Limitations
  • Types of Devices Available
    • Grab Samplers
    • Peristaltic and Suction-Lift Pumps
    • Electric Centrifugal Submersible Pumps

Total CEUs for Module GWM-20: 1.0 CEU

Module GWM–21 (Total Length: 58 minutes) Price: Price: $159.00 Sign in to Your E-School Account to Register

Operational Characteristics, Applications and Limitations of Positive Displacement Pumps (Gear-Drive Electric Submersible Pumps, Double-Acting Piston Pumps, Bladder Pumps and Gas-Drive Pumps) and Inertial-Lift Pumps

• Overview of Available Sampling Devices -  Operational Characteristics and Limitations (continued)
  • Types of Devices Available
    • Positive Displacement Pumps
      • Electric Gear-Drive Submersible Pumps
      • Double-Acting Piston Pumps
      • Bladder Pumps
      • Gas-Drive Pumps
    • Inertial-Lift (Tubing/Check Valve) Pumps

Total CEUs for Module GWM-21: 1.0 CEU

Topic: Conventional Purging and Sampling Practices

Since regulatory programs mandating ground-water monitoring and sampling at a variety of sites first started in the 1970s, a number of different approaches for collecting ground-water samples from monitoring wells have been implemented. Some of the “conventional” purging and sampling practices first used in the 1970s (like well-volume purging and sampling and purging a well to dryness) continue to be implemented today, even though it has been repeatedly demonstrated through decades of research that these methods are rarely, if ever, capable of producing representative samples.  This module discusses how these practices are implemented, and how these and other practices are applied to both high-yield wells and low-yield wells that tend to go dry during purging.  Discussions are provided to document the limitations that research has found with these purging and sampling practices.  If you are still purging 3 to 5 well volumes as a purging strategy or if you are still purging wells to dryness then returning in 24 hours to sample (or if you are overseeing projects where these techniques are being used), then this is a module you should not miss!  Field videos are included within this module to explain the practices and procedures used in conventional purging and sampling.

Module GWM–22 (Total Length: 51 minutes) Price: $159.00 Sign in to Your E-School Account to Register

Conventional Purging and Sampling Practices for High-Yield and Low-Yield Wells

• Objectives of Conventional Purging
• Discussion of ASTM Standards D 6452 on Purging Ground-Water Monitoring Wells and D 4448 on Sampling Ground-Water Monitoring Wells
• Comparison of Conventional Strategies for Purging High-Yield Wells
• Problems With Conventional Purging Methods for High-Yield Wells
• Placement of Purging Devices Within the Water Column
• Conventional and Improved Approaches to Sampling Low-Yield Wells

Total CEUs for Module GWM-22: 1.0 CEU