Although excavation work has not begun, you can now view near real-time air monitoring data from the Pit F area on the Pit F Telemetry Air Monitoring webpage. In addition to 24/7 air monitoring conducted at the perimeter of the Site and at neighborhood stations, a telemetry-based air monitoring network is collecting additional air quality data during work hours for Pit F cleanup.

There are field mobilization activities and equipment testing at and near Pit F scheduled during the week of June 7. Excavation work currently is scheduled to being the week of June 14th and conclude in August 2021. Work hours are from 7 a.m. – 6 p.m., Monday through Friday, and on Saturday if required.


  • MAINTENANCE: Regular maintenance will be conducted within the Site and around the perimeter fence areas. These activities can require workers and equipment arriving onsite.

  • PIT F TENT MAINTENANCE AND PREPARATION: Workers are conducting preparations and maintenance on the large white tent on the east side of Ascon near Magnolia Street in advance of future remedial work inside the tent, which currently is scheduled to start the week of June 14th. Learn more with our Pit F explainer and watch a Pit F work overview video here.

    You may see: Workers, materials, and large equipment, like manlifts, small cranes, water trucks, forklifts, materials storage bins, may be arriving or be 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 week.

  • 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. As mobilization and field work begin at Pit F, there also will be overnight equipment monitoring personnel.


    • DTSC continues its ongoing weekly inspections of Ascon. DTSC plans to be present for key Pit F mobilization activities and daily during Pit F excavation work.
    • 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.
  • 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. There also is activity in Edison Park relating to construction by the City of Huntington Beach of a skate park during June 2021.


Air monitoring continues both on the Ascon Site and at community locations, which includes dust data at upwind and downwind stations on the Ascon Site documenting effective dust control measures.

As mentioned under Did You Know (above), near real-time air monitoring data from the Pit F area is being shared during mobilization and excavation phases on the Pit F Telemetry Air Monitoring webpage.

For more information about Ascon’s air monitoring, data sharing, and live streaming weather conditions from the Ascon site, 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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