You can access DTSC’s Ascon reports, studies and community updates through their EnviroStor website.

To view Ascon-specific materials, visit www.envirostor.dtsc.ca.gov/public/, type “Ascon” in the search box and choose “ASCON LANDFILL” from the dropdown menu. You can click “SIGN UP FOR EMAIL ALERTS” to be notified when new Ascon materials are uploaded by DTSC.

On EnviroStor you can view:

  • DTSC’s Ascon summary with a Site History
  • Fact sheets, DTSC’s field reports and verified air monitoring results under “Community Involvement”
  • Work plans, Interim Groundwater Monitoring Reports, community updates under “Site/Facility Docs”
  • Additional Site background and documents are under “Activities”, “Map”, “Sub-Areas” and “CalEnviroScreen”
envirostor website thumbnail


  • 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: 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 Friday, with personnel arriving earlier. A small drill rig will be onsite to conduct deeper soil sampling in several areas of the Site.

    You may see: Workers, materials, small drill rig, and small equipment needed to conduct soil vapor sampling.

  • PIT F TENT MAINTENANCE AND PREPARATION: Workers are conducting maintenance on the large white tent on the east side of Ascon near Magnolia Street in advance of future remedial work inside the tent.

    You may see: Workers, materials and large equipment like manlifts, stormwater management materials and water trucks may be arriving or being removed from the Site. This includes turning on equipment like the air treatment system for operational checks. You may hear periodic sounds, like vehicle backup signaling required for worker safety, and sounds from air treatment system testing. There is no remedial excavation work occurring during this time.

  • SECURITY: 24-hour onsite security continues. Security are 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.
    • 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 most recent inspection by Orange County Vector Control was conducted on April 7.
  • NEARBY ACTIVITIES: Please note there are automobile storage activities that may generate noise or dust 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, which includes dust data at upwind and downwind monitoring stations on the Ascon site documenting effective dust control measures.

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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