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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 ES–25 (Total Length: 71 minutes) Price: $159.00  Sign in to Your E-Schoo 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 ES-25: 1.2 CEUs

Ground-water sample chemistry, by nature, will change within seconds as samples are brought from in-situ conditions (within the ground-water system, where it is at higher pressure and stable pH and temperature relative to atmospheric conditions) to the surface. When these changes occur, the representative nature of the sample is compromised. This series of 2 modules discusses in detail the sample pretreatment methods, including sample filtration and preservation, that must be implemented in the field at the time of sample collection (not later, in the laboratory) to protect the physical and chemical integrity of the samples from the time the sample container is filled to the time it is extracted or analyzed in the laboratory. Upon completing these modules, you will know how to recognize and avoid several significant but common sources of error associated with field filtration and preservation of ground-water samples. Field videos are included within each module to explain the practices and procedures used in filtration and preservation of ground-water samples. 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–26 (Total Length: 51 minutes) Price: $159.00 Sign in to Your E-School Account to Register

Ground-Water Sample Filtration

  • Field Filtration of Ground-Water Samples
    • Objectives and Purposes of Sample Filtration
    • Naturally Occurring vs. Artifactual Turbidity in Samples
    • Filtration Methods Available for Ground-Water Samples
    • Discussion of ASTM Standard D 6564 on Field Filtration of Ground-Water Samples
    • Which Parameters Should and Which Should Not be Filtered
    • Filter Preconditioning – What it is, Why and How it Should be Done

Module ES–27 (Total Length: 40 minutes) Price: $159.00 Sign in to Your E-School Account to Register

Ground-Water Sample Preservation

  • Physical and Chemical Preservation of Ground-Water Samples
    • Objectives and Purposes of Sample Preservation
    • Physical Sample Preservation – Things You Never Thought of as Sample Preservation
    • Chemical Preservation of Samples – When, Where and How it Should be Done
    • Overview of ASTM Standard D 6517 on Field Preservation of Ground-Water Samples
    • Elements of QA/QC for preservation of samples

Total CEUs for Module ES-26: 1 CEU

Total CEUs for Module ES-27: 1 CEU

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