Past Actions

Lagoon 5 Solidification and Oil Well Abandonment 2017-2018

Field work involving the solidification of Lagoon 5 and the abandonment of Pacific Ranch 1 and 1a — inactive oil wells dating to the 1920s — was conducted from July 2017 to May 2018 (including preparation and demobilization). This work had to occur prior to the final remedy of the Site. Additional information on this field work can be found in Fact Sheet #18 and the Ascon Community Notice, October 2017, found under the “Fact Sheets and Updates” tab of this website.

Interim Removal Measure 2010-2011

The “Interim Removal Measure” (IRM) was conducted in 2010 through early 2011 to remove tarry materials from a few of the lagoons, enabling the assessment of the material under these lagoons (see “Interim Removal Measure 2010” tab of this web site for more information). During the IRM work, rock and gravel were placed on new roadways and exposed areas to minimize erosion of site soils. DTSC approved the IRM Completion Report in May 2012. Additional information on the “Interim Removal Measure” can be found under the “Interim Removal Measure (IRM) 2010” tab of this website.

View Completion Report ➔

Emergency Action 2005-2006

An “Emergency Action” was conducted at the Site in 2005 through early 2006 to remove some waste and prevent a potential emergency from occurring, in response to the heavy rains received in the 2004-2005 winter (see Emergency Action 2005 tab on this web site for more information). During this work effort, additional field work was conducted to provide for improved storm water management. Interior roadways were improved for the future clean up and for first responder vehicles. Additional information on the “Emergency Action” can be found under the “Emergency Action 2005” tab of this website.

View Completion Report ➔