By: Jennifer Schaffer
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By: Jennifer Schaffer [email protected] LNAPL (Light Non-Aqueous Phase Liquids). Courtesy of U.S. Geological Survey. 3-D Image of LNAPL Plume. Leaks & Spills: 1992-2002 Sampling of Incidents at Shell Group Companies & Joint Ventures*.

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Lnapl light non aqueous phase liquids
LNAPL(Light Non-Aqueous Phase Liquids)

Courtesy of U.S. Geological Survey

3 d image of lnapl plume
3-D Image of LNAPL Plume

Leaks & Spills: 1992-2002

Sampling of Incidents at Shell Group Companies & Joint Ventures*

Derived from:

Prevalence of gasoline spills
Prevalence of Gasoline Spills

  • 8 sites on the NPL

  • According to National Response Center, have been 7,957 gasoline spills on land since 1990.

  • Gas spills were primarily unreported until recent history.

    • There were no formal reporting requirements prior to 1970.

    • From 1970-1980, only spills that reached navigable waters had to be reported

Sugar creek missouri
Sugar Creek, Missouri

Methods used for cleanup
Methods Used for Cleanup

  • Biofiltration

  • Scrubbers

  • Carbon Absorbtion

  • Bioremediation - microbials

  • Free product recovery – Skimming systems

  • Free product recovery – water table depression

  • Vapor Extraction

  • Dual Phase Recovery

  • Pumps




Enhanced methods
Enhanced Methods

  • Steam

  • Surfactants

  • Phased soil heating

  • Chemical oxidation

  • Hot and cold water floods


This process requires large facilities and operations as well as significant time and money.


Wetting agents that lower the surface tension of a liquid, allowing easier spreading, and lower the interfacial tension between the two liquids. These are already used in green cleaning products.

Ways this gasoline could be used
Ways this Gasoline Could be Used

  • Marine Uses

  • Aviation Fuel

  • South America, Asia, Eastern Europe and the Middle East – automotive

  • Racing cars

  • Farm equipment

  • Industrial uses

  • Energy Production

Patent, 1935

issued to

F.E. Neff, Jr.

Carbon gasoline/oil products


So why are more companies not recycling reusing the gas
So, why are more companies not recycling/reusing the gas? gasoline/oil products

  • Cost – is it worth the costs?

    • How do the costs compare?

    • Are there “hidden costs” to recovery?

    • Diminishing Returns from recovery

  • Potentially liability

    • Ramifications of claiming the gasoline

    • Property dispute issues

Hydraulic recovery of the oil poses difficulty
Hydraulic Recovery of the Oil Poses Difficulty gasoline/oil products

  • Residual saturation trapped by capillary forces

  • Heterogeneity of the soil

  • Conductivity of the LNAPL phase

  • What could be done to encourage recycling gasoline/oil products?

    • Legislation which encourages and or compels recovery

    • Legislation which removes liability issues

    • Legislation which resolves property ownership issues

  • Should it be done?

    • Would we be trading one pollution for another?

    • Should there be limits or regulations on how recovered gasoline can be used/sold?