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United States Environmental Protection Agency
A Systematic Approach for Evaluation of Capture Zones at Pump and Treat Systems
Sponsored by: U.S. EPA Technology Innovation Program
Original Time/Date of Presentation:

September 11, 2008, 2:00 PM - 4:00 PM, EDT (18:00-20:00 GMT)

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Presentation Overview:

A Systematic Approach for Evaluation of Capture Zones at Pump and Treat Systems presents a systematic approach for the evaluation of capture zones at pump and treat systems, and provides an overview of a recently published USEPA document on the topic (EPA 600/R-08/003, January 2008). The target audience for the course is project managers who review those analyses and/or make decisions based on these types of analyses. This course will highlight:

  • The importance of capture zone analysis during ground water remediation, particularly for sites requiring containment
  • Key concepts of capture, such as "target capture zones" and "converging lines of evidence"
  • Typical errors made in capture zone analysis
In addition, steps associated with a systematic approach for capture zone analysis will be discussed. These steps include the following:
  • Step 1: Review site data, site conceptual model, and remedy objectives
  • Step 2: Define site-specific Target Capture Zone(s)
  • Step 3: Interpret water levels
    • Potentiometric surface maps (horizontal) and water level difference maps (vertical)
    • Water level pairs (gradient control points)
  • Step 4: Perform calculations (as appropriate based on site complexity)
    • Estimated flow rate calculation
    • Capture zone width calculation
    • Modeling (analytical and/or numerical) to simulate water levels, in conjunction with particle tracking and/or transport modeling
  • Step 5: Evaluate concentration trends
  • Step 6: Interpret actual capture based on steps 1-5, compare to Target Capture Zone(s), and assess uncertainties and data gaps

Examples will be used to demonstrate key aspects of capture zone analysis.

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