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March 19, 2019 - March 20, 2019



A revolution has occurred over the last decade with best practices for managing risks at LNAPL sites.


Ten years ago we were using the thickness of LNAPL in wells to measure remediation progress, we thought that LNAPL bodies only decayed very slowly, and didn’t appreciate the importance of methanogenic reactions or understand how sheens and seeps work. Since then a body of work by top environmental researchers and practitioners, with contributions from both short course presenters, has revolutionized how we think about LNAPL sites and how we should control their risk.

This short course will describe these dramatic changes in the LNAPL world through thoughtfully-designed lectures, interactive question and answer sessions, illuminating in-class exercises, and a lively participant panel discussion.

The foundation of the course is the recent update of: “Managing Risk at LNAPL Sites, 2nd Edition” (Bulletin 18 from the American Petroleum Institute) by Dr. Tom Sale. For the field of remediation, the 2003 1st edition was a best seller. Fifteen years later, critical new knowledge has emerged offering the promise of better LNAPL solutions so that over 80 percent of the cited references in the 2nd edition are new and have been published since release of the 1st edition.

This course is designed to introduce participants to new strategies through new paradigms, emerging technologies, and more sustainable solutions for managing LNAPL sites.


Remarkable opportunities are open today to those versed in modern concepts and tools for LNAPL sites.

Conversely, little time is left for managing LNAPL sites per past practices.


Course Outline:

  • A History of LNAPLs – Context About How We Got to Where We Are Today
  • LNAPL Fundamentals
    • Multiple-Phase Flow
    • Natural Attenuation
    • Natural Source Zone Depletion
  • Modern Site Conceptual Models
    • Roles of Conceptual Models
    • Legacy Approaches
    • Soil and Groundwater Models
    • Groundwater and Surface Water Interface Models
    • 14-Compartment Model
  • Modern Tools for LNAPL Characterizations
    • Legacy Strategies and Approaches
    • Impact of New Technologies
    • The Role of Geologic Context and Field Information
    • Emerging Techniques and Technologies
    • Revolution of Cloud-Based Information
  • LNAPL Remediation Strategies
    • Historical Context
    • Active LNAPL Depletion
    • Sheens and Seeps
    • Natural Source Zone Depletion
    • Bioventing revisited
    • Benzene
    • Late stage chemical oxidation
    • Low T Thermal
    • Vapor Intrusion Emerging Changes
  • The Future – Internet Based Monitoring
  • Decision Guide Processes for Managing Risk
    • Impact of Site Conceptual Model
    • Resolving Objectives: Technical, Regulatory and Financial
    • Vision for Sustainability
  • Concluding Workshop
    • Participant Panel

Benefit from workshops that encourage thinking, creativity, technical mastery and managing LNAPL risk.


Workshop 1: Developing an LNAPL Site Conceptual Model: Assessing Risk, Tools for Characterization, and Remedies
Workshop 2: Exercise: LNAPL Presence, Duration and Extent Given Active Releases
Workshop 3: Exercise: List the Attributes of Early, Middle and Late Stages Sites
Workshop 4: Exercise: Recognizing and Managing Subsurface Uncertainties
Workshop 5: Tools and Strategies for Characterizing Subsurface Releases: Differing Site Stage
Workshop 6: Discussion: Primary Remedies for Subsurface Releases as a Function of Site Stage


Being current with best practices for managing risk at LNAPL sites is essential to sustainable careers


March 19, 2019
March 20, 2019
Event Category:


March 19, 2019
March 20, 2019
Event Category: