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Have you ever wondered if there is a better method than you are currently using for collecting more representative water-level data and ground-water samples from your wells? Ever thought about all of the various sources of bias and error in water-level measurement and sample collection procedures and wondered how each could affect the data in your sampling program? This series of two modules provides an in-depth discussion of how water-level measurement and ground-water sampling protocols have evolved over the years and how, through decades of research, modern sampling methods (when implemented properly) can yield vastly improved field data and more representative ground-water samples. Learn how to anticipate and avoid the many potential sources of bias and error that may occur in water-level measurement and ground-water sampling programs, and what factors can affect the representative nature of the samples you collect. Field videos are included within the first module to explain how to collect ground-water level measurements using several different methods. 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 ES-18 (Total Length 80 minutes) Price: $159.00 Log in to YOur E-School Account to Register

The Science Behind Ground-Water Sampling (Part 1): Defining Sampling Objectives; Accuracy, Precision & Bias; Uses of Water-Level Data; Water-Level Measurement Methods; Sources of Bias and Error in Water-Level Measurement

Objectives and Purposes of Ground-Water Sampling
- Collection of Representative Water-Level Data
- Collection of Representative Water Chemistry Data

The Importance of High-Quality Data in Ground-Water Sampling
- Accuracy, Precision and Bias

Ground-Water Level Data

Uses of Water-Level Data
General Methods for Water-Level Measurement
Water-Level Measurement Methods
Recognizing and Avoiding Sources of Bias and Error in Water-Level Measurement

Module ES-19 (Total Length: 70 minutes) Price: $159.00 Log in to Your E-School Account to Register

The Science Behind Ground-Water Sampling (Part 2): Sources of Bias and Error in Ground-Water Sampling; Factors Affecting the Representative Nature of Ground-Water Samples

Sources of Bias and Error in Ground-Water Sampling
- Purging Practices, Field Parameter Measurement, Ground-Water Sample Collection

Definition of a “Representative” Sample
Conditions Under Which Ground Water Typically Occurs
Factors Affecting the Representative Nature of Ground-Water Samples
- Sampling Point Placement, Design, Installation and Development
- Formation and Well Hydraulics Between and During Sampling Events
- Chemistry of the Water Column Above and Within the Well Screen
- Well Purging and Sampling and Associated Issues

Total CEUs for Module ES-18: 1.3 CEUs

Total CEUs for Module ES-19: 1.2 CEUs

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 two modules uses a comprehensive series of classroom and field videos to provide 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 discussions 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 ES-20 (Total Length: 42 minutes) Price: $159.00 Sign in to Register from Your E-School Account

Selection and Operation of Ground-Water Purging & Sampling Devices (Part 1) -- Sampling Device Selection Criteria; Sampling Device Impacts on Sample Chemistry; Operational Characteristics 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

Module ES–21 (Total Length: 55 minutes) Price: $159.00 Sign in to Register from Your E-School Account

Selection and Operation of Ground-Water Purging & Sampling Devices (Part 2) -- Operational Characteristics and Limitations of Positive Displacement Pumps (Gear-Drive Electric Submersible Pumps, Double-Acting Piston Pumps, Gas-Drive Pumps and Bladder Pumps) and Inertial-Lift Devices