Los Angeles Light Non-Aqueous Phase Liquid (LNAPL) Recoverability Study

The Los Angeles Light Non-Aqueous Phase Liquid (LNAPL) Recoverability Study (“LA LNAPL Project”) is a 7-year collaborative research effort joining agencies with industry to identify and better understand technologies and techniques suitable to treat LNAPL in the LA Basin. The LA LNAPL Workgroup and their contractors included: Western States Petroleum Association (WSPA), Water Replenishment District (WRD), Regional Water Quality Control Board Los Angeles (RWQCB-L.A.), Shell, ExxonMobil, Phillips 66, Chevron, Tesoro, Colorado State University, AECOM, and GSI Environmental Inc.

The Workgroup evaluated over 20 LNAPL remediation technologies to address a very difficult problem:  what to do about LNAPL that remains after LNAPL pumping projects have removed the recoverable LNAPL.

After a comprehensive literature review and analysis of what could be done at candidate research sites, the group then conducted Pilot Tests of three very different technologies, ranging from more passive to more intensive approaches, and obtained valuable information on how each technology could perform in the LA Basin.

Using information from a detailed Literature Review of recent science combined with the Pilot Test results, the Workgroup outlined a Decision Tree for managing LNAPL sites based on risk, previous removal efforts, technical practicability, and other factors.

We consider the LA LNAPL Project a success and a model of how collaborative projects can be conducted.  More work is needed but this is a great start on the road to understanding and handling of LNAPL sites.

Contact: Charles J. Newell, Ph.D., P.E. (This email address is being protected from spambots. You need JavaScript enabled to view it.) or Poonam R. Kulkarni, P.E. (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Key Products

LNAPL Literature Review Evaluation of Recovery Technologies
Conducted Three Pilot Tests LNAPL Management Decision Tree

Downloads

DescriptionDocument TypeSize
 LA LNAPL Final Report PDF 3.8Mb
 Source Report A: Literature Review PDF 3.5Mb
 Source Report B: Final Report for Pulsed Oxygen Biosparging (POBS) Pilot Test PDF 5.6Mb
 Source Report C: Final Report for Surfactant Aquifer Remediation (SEAR) Pilot Test  PDF  14.9Mb
 Source Report D: Natural Source Zone Depletion (NSZD) Pilot Test Memos  PDF 5.1Mb