You can learn more about past cleanup efforts at the Ascon Site, the current cleanup plan and the investigations that guide Ascon cleanup actions on the “Cleanup Activities” page.

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  • ONGOING MAINTENANCE: On Wednesday, October 28th, workers will be onsite to perform regular equipment maintenance and replacement.

    skid steer

    You may see: a small number of flatbed trucks bringing a skid steer and equipment into and out of Ascon, as well as a small number of workers, with activity primarily in the southwest zone.

  • SECURITY: 24-hour onsite security continues. Security may not be visible at the entrance gates. The Ascon security personnel are primarily within the Site conducting daytime and nighttime patrols of the 38-acre property. In addition to 24/7 onsite security, there are regular visits by air quality technicians, site inspectors, and Site maintenance personnel.

  • INSPECTIONS: Regular inspection of the “Pit F” tent will be conducted. DTSC continues its ongoing weekly inspections of Ascon.

  • SUPPLY DELIVERY: Supplies for ongoing stormwater management may be delivered.

  • Please note there are activities unrelated to Ascon at the former tank farm property, south of Ascon and adjacent to Magnolia Street.


Air monitoring continues both on the Ascon site and at community locations. For more information about Ascon’s air monitoring and data sharing, please visit Actively Monitoring Air Quality on this website. Data are submitted to DTSC and shared on their online document archive, Envirostor. To view archived air monitoring results posted by DTSC on Envirostor, click on “Community Involvement Documents” and scroll to “Updates and Information.”


Work at Ascon is being conducted under Site safety protocols regarding COVID-19. These practices apply to air quality professionals and other team members who may be outside the fence conducting work. We ask for the community’s support of these safety practices by maintaining physical distancing to allow these professionals to focus on their work and stay safe.

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