Light Non-Aqueous Phase Liquid (LNAPL) Resource Center

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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Version Date: May 2003
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LNAPL Distribution and Recovery Model (LDRM)
API Publication 4760
January 2007

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. More…

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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. More...

API Interactive LNAPL Guide Version 2.0
August 2004

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. More...

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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. More...

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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. More...