INTRODUCTION
Welcome to the Dominguez Channel Site Assessment and Cleanup Home Page. This website
contains information regarding the “Dominguez Channel LNAPL Investigation” in Carson, California. Resource Environmental, LLC (www.rellc.net) in collaboration with AECOM (www.aecom.com), formerly URS Corporation, is investigating and remediating petroleum light non-aqueous phase liquid (LNAPL) that was initially detected in January 2011. Sheens of LNAPL were observed on the channel water during low tides along and near a pipeline corridor that transects the Dominguez Channel approximately 400 feet south of the E. Carson Street Bridge.
RELLC initiated its investigation in July 2011 and implemented a remedial program to address the
sheening on the channel. After 2012, sheening had been minimal as the interim remedial measures have been effective and significantly reduced the presence of sheen. However, sheen appeared on the channel again in March 2019, April 2020, March 2023, and February 2024, and in those instances absorbent booms were deployed on the channel to contain and remove the sheen.
The source of the LNAPL has been determined to be most likely from pipeline release(s) during
the 1950-80 era. The results to date indicate that the larger source areas exist along the western
levee. Ongoing investigations have only detected limited, isolated release points of non-
recoverable LNAPL outside of this area. In general, the areas impacted by historic pipeline leak(s)
have now been identified. Potential human health impacts have been investigated and no issues
have been identified to date that need to be addressed.
The investigation and remediation activities will continue with minimal effect on residences and
businesses. During certain times, some of the businesses and streets will be temporarily
occupied by investigation and construction equipment. In order to complete this work,
infrequently some traffic lanes could be temporarily closed for just a few hours Monday through
Friday.
This “Dominguez Channel LNAPL Investigation” is being implemented under the oversight of the
Los Angeles Regional Water Quality Control Board (LARWQCB) and with the cooperation of area
businesses that have been affected by the project activities.
Site Location
Project Equipment
