Beaumont, California Potrero Canyon

The work at the Potrero Canyon site included implementation of a groundwater treatment system near the rocket-motor production area. In 2002,1,4-dioxane, a newly regulated chemical, was identified in the groundwater, and Lockheed Martin shut down the groundwater treatment system to conduct additional investigations and review remediation alternatives for the site. Information from these investigations was used to develop a Remedial Action Plan (RAP) for the site that Lockheed Martin submitted to the California Department of Toxic Substance Control (DTSC) in 2014. Public review of the Potrero Canyon RAP occurred in 2015 and the plan was approved in 2016. For more information view the Potrero Canyon Fact Sheet.


Many of the documents for the project are extremely large. We provide links to the main body, text, tables and figures on this page. Please use the contact button below to request appendices and additional information.


Semiannual Groundwater Monitoring Report with Appendices 3rd and 4th Quarter 2010

Well Rehabilitation, Destruction and Well Installation Report Site 1 November 2010

Summary Remedial Investigation Report Site 1 November 2010

Groundwater Monitoring Well Installation Report July 2010

Groundwater Monitoring Well Installation Report Supplemental Site 1 July 2010

Scoping Ecological Risk Assessment Site 1 April 2010

Follow-On Munitions and Explosives of Concern (MEC) Evaluation Summary Report March 2010

Transient Groundwater Model Report, Numerical Flow Model Development January 2010

Potrero Creek Groundwater Pumping Test Report January 2010



Technical Memorandum: Numerical Transport Model Development Plume/COC Conceptual Model December 2009

Lineament Study Site 1 December 2009

Technical Memorandum: Mass of Contaminants, Water Volume, Groundwater Velocity and Travel Times in Site 1 &2 Groundwater Plumes November 2009

Dynamic Site Investigation Former Operational Areas B, C, F, G and H Site 1 August 2009

Semi-Annual Groundwater Monitoring Report Third and Fourth Quarter 2009

Semiannual Groundwater Monitoring Report 1st and 2nd Quarter 2009

Remedial Design Characterization Report for the Former Sanitary Landfill July 2009

Characterization Report Feature F-33, Former Large Motor Washout Area June 2009

Supplemental Soil Investigation Report Historical Operational Areas A, B, C, D, F, G and H February 2009


Supplemental Munitions and Explosives of Concern (MEC) Evaluation and Removal Report October 2008

Historical Well Records Search and Field Surveys for Production Wells W1-3, W1-4 and W1-6 April 2008


Production Well Abandonment Report May 2006


Production Well Abandonment Work Plan August 2003


Supplemental Site Characterization Report September 2002


Earth Tech Five Year Review Beaumont Site I March 2000


Burn Pit Area Remediation System Evaluation September 1998


Remediation System Six Month Evaluation May 1995


Extraction System Installation Completion Report December 1993

Burn Pit Area Removal Action Report 1993  



Remedial Action Plan August 1992

View a List of Terms Commonly Used in Relation to General Environmental Remediation Efforts