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Light Non-Aqueous Phase Liquid (LNAPL) Resource Center


ASTM LNAPL Transmissivity  Course:  "Workshop on Estimating LNAPL Transmissivity"
Tuesday, April 28, 2015 - Marriott Anaheim (Anaheim, CA)
See more information at ASTM
ASTM Standard Guide for Estimation of LNAPL Transmissivity  (E2856)

2-DAY CLASSROOM TRAINING: Light Nonaqueous-Phase Liquids: Science, Management, and Technology 
ITRC plans to offer the following 2-day LNAPL classroom training in 2014 and 2015: 

  • October 29-30, 2014 in Richmond, VA - hosted by the Virginia Department of Environmental Quality. Email training@itrcweb.org if you would like to receive an email when registration opens.King of Prussia, PA on April 9-10, 2013, hosted by ITRC state member Pennsylvania Department of Environmental Protection. Class completed with over 160 participants.
  • April 7-8, 2015 in Denver, CO - Hosted by:  Colorado Department of Public Health and Environment and Colorado Department of Labor and Employment Division of Oil and Public Safety
    Registration open at: https://www.regonline.com/ITRC-LNAPL-CO
  • September 15-16, 2015 in Seattle (area), WA - Hosted by: Washington State Department of Ecology
    Registration expected to open Spring 2015
  • November 18-19, 2015 in Austin, TX - Hosted by:  Texas Commission on Environmental Quality
    Registration expected to open Spring 2015

For more information go to: www.itrcweb.org/training.

Now available for download: API LNAPL Transmissivity Workbook:  Calculation of LNAPL Transmissivity from Baildown Test Data.

Three new NAPL papers published:

    Use of Single-Well Tracer Dilution Tests to Evaluate LNAPL Flux at Seven Field Sites
    Nicholas Mahler, Tom Sale, Tim Smith and Mark Lyverse
    Article first published online: 28 DEC 2011

    Measurement of LNAPL Flux Using Single-Well Intermittent Mixing Tracer Dilution Tests
    Tim Smith, Tom Sale, Mark Lyverse
    Article first published online: 10 APR 2012

    A Mass Balance Approach to Resolving LNAPL Stability
    Nicholas Mahler, Tom Sale, Mark Lyverse
    Article first published online: 22 MAY 2012

API LNAPL Resources

The LNAPL Resource Center contains manuals, software and other technical material to help you address cleanup of free-phase petroleum hydrocarbons in the shallow subsurface.

Answers to Frequently Asked Questions About Managing Risk at LNAPL Sites

This easy-to-read brochure offers answers to practical and technical questions about cost-effective management, cleanup or closure of sites with groundwater impacted by light non-aqueous phase liquids (LNAPL), such as petroleum hydrocarbons. Click here to view the questions. Click below to download the brochure.

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API LNAPL Transmissivity Workbook: Calculation of LNAPL Transmissivity from Baildown Test Data

The 6 files available for download include the updated API LNAPL transmissivity workbook, a user guide, and three example workbooks (Ex1, Ex2 and Ex3). There is also a metric version of the workbook. This is a prepublication version, and minor edits may occur prior to final publication. View More

LNAPL Distribution and Recovery Model (LDRM)

API Publication 4760
May 28, 2008

API LDRM Version 1.2 addresses a units conversion error in Version 1.1 for the metric units output for skimmer well recovery rates.

The API LNAPL Distribution and Recovery Model (LDRM) simulates the performance of proven hydraulic technologies for recovering free-product petroleum liquid releases to groundwater. Model scenarios included in the LDRM are hydrocarbon liquid recovery using: single- and dual-pump well systems, skimmer wells, vacuum-enhanced well systems, and trenches. The LDRM provides information about LNAPL distribution in porous media and allows the user to estimate LNAPL recovery rates, volumes and times.  View More

Evaluating Hydrocarbon Removal from Source Zones and its Effect on Dissolved Plume Longevity and Concentration

API Publication 4715
September 2002

This study provides quantitative theory and tools to evaluate LNAPL sources, their chemistry, and the effects various remediation strategies may have on groundwater and vapor exposure pathways. View More

API Interactive LNAPL Guide Version 2.0.4

February 2006

The Guide is designed to provide an overall approach for evaluating LNAPL at a site to assess its potential risk, quantitatively defining mobility and recoverability, developing remedial strategies, and examining methods to enhance site closure. View More

Methods for Determining Inputs to Environmental Petroleum Hydrocarbon Mobility and Recovery Models

API Publication 4711
July 2001

Important fluid and soil property parameters are explained. Methods to measure each parameter are presented in order of relevance for use in environmental free-product mobility/recovery assessments. View More

Light Non-Aqueous Phase Liquid (LNAPL) Parameters Database Database and Guide for Data Retrieval

October 2006

This database is a collection of information about samples that have had their capillary parameters determined, as well as other physical parameters measured. Its purpose is to help users who are trying to characterize the movement and distribution of LNAPL within a site that has a limited set of direct observations. View More