During the current phase of the Ascon Sitewide Odor Assessment, sampling of vapor probes installed throughout the Site is being conducted to assess spatial and vertical distribution of potential odor-causing waste.

Samples collected are sent for laboratory analysis of chemical composition and odor characteristics. This data will inform planning for future cleanup work.

Workers onsite conduct vapor sampling using the apparatus shown above over a soil vapor probe boring.


  • MAINTENANCE: Regular maintenance will be conducted within the Site and around the perimeter fence areas, including onsite activity regarding maintenance of stormwater management measures.

  • SITEWIDE ODOR ASSESSMENT: Preparation for scheduled work began the week of January 19, and field investigations will continue through April, with regular visits by DTSC to observe the work.

    • Work will be conducted between the hours of 7 a.m. and 6 p.m., Monday through Saturday, with personnel arriving earlier.

    You may see: Workers, materials and large equipment like manlifts, stormwater management materials and water trucks may be arriving onsite. You may hear construction sounds, like backup safety signaling, from the Site.

  • SECURITY: 24-hour onsite security continues. Security is not always 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.


    • DTSC continues its ongoing weekly inspections of Ascon.
    • City of Huntington Beach continues its regular stormwater inspections of Ascon. The last stormwater inspection with the City of Huntington Beach was Tuesday, February 23.
    • Regular inspection of the “Pit F” tent will be conducted.
    • Regular inspections are conducted by Orange County Mosquito and Vector Control District of the onsite detention basins and other areas of the Ascon Site where water may be detained. The last inspection with Orange County Mosquito and Vector Control District was Wednesday, February 24.
  • NEARBY ACTIVITIES: 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 the Actively Monitoring Air Quality page on this website. Data is 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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