Cleanup Activities

As we engage with our neighbors to complete the remedial work, the health and safety of the Huntington Beach community is our highest priority.

Ascon team members reviewing soil sampling data.

What’s Been Done

Over the past 16 years, the Ascon team has made significant progress on cleanup efforts. Three separate cleanup actions were completed at the Ascon Landfill Site from 2005 to 2018. Together, the following actions included the removal of approximately 128,000 cubic yards of waste materials.

2020 – 2021

Fieldwork was conducted, including the solidification of the Lagoon 5 area on the Site and the capping of inactive wells, emergency Northwest berm repair and the excavation and off haul of Pit F.

2010 – 2011

An Interim Removal Measure removed impacted materials from interior lagoons to enable further environmental assessment.

2005 – 2006

An emergency action was conducted to remove materials, strengthen a berm and improve stormwater management following a 200-year rain event.

Current Cleanup Plan

In 2015, the California Department of Toxic Substances Control (DTSC) approved a Final Remedial Action Plan (RAP) outlining cleanup activities for the Ascon Site. The cleanup plan was approved following a rigorous, multi-year public review and a formal Environmental Impact Report (EIR) process per the California Environmental Quality Act (CEQA).

Since work began in January 2019 on the activities outlined in the RAP, approximately 35 percent of the work has been completed.

The cleanup plan includes the removal and offsite disposal of impacted soils from the Pit F area. The other material (with the exception of Pit F material), will be excavated, stabilized, and placed in an engineered containment area underneath an environmental cap. Once this work is complete, the Site will be capped with environmental barriers and clean soils, and planted with native, drought-tolerant plants. The property will be maintained long-term as fenced open space.

Ascon team hosting a safety tailgate meeting.
Ascon team member using a handheld device to sample air quality.

Current Cleanup Status

Work on the cleanup was paused in June 2019 at DTSC’s direction to address community concerns about dust and odor. Since then, the Ascon team has introduced additional health and safety enhancements to protect the community. Work conducted since the pause was directed by DTSC. Once the full remediation resumes, it is anticipated the remaining cleanup will take approximately 18 months to complete.

Learn more about the Pit F excavation work here.

Check out Site Updates to find out what our team is doing this week on Site and in the community.

Investigations Guide Cleanup Actions

Numerous Site investigations have taken place over more than 30 years, including soil sampling, groundwater monitoring and air monitoring. What we learned from the following ongoing investigations are guiding our cleanup approach:

  • View the Revised Feasibility Study approved by DTSC in September 2007 to learn more.

  • Sampling and investigations conducted since 2002 found the impacts to shallow groundwater are contained within the Site boundaries.

  • Air monitoring is used to ensure air quality meets health-protective screening levels. Click here to learn more about air monitoring at the Site.

Frequently Asked Question

Our team is maintaining the Site, conducting air and groundwater monitoring, performing health and safety enhancements to control dust and odors, and providing Site security. These actions do not involve any remediation work.

Ascon team member collecting data from an air monitoring trailer offsite.

Site Documents

Remedial Action Plan (RAP)
    Environmental Impact Report (EIR)
      Interim Removal Measure (IRM)
        Revised Feasibility Study
          Groundwater Remedial Investigation
            Emergency Action (EA) Completion Report