No excavation is occurring this week. There is work activity inside the Pit F tent to prepare for excavation. Pit F work concludes in August. Work hours are from 7 a.m. – 6 p.m., Monday through Friday, and on Saturday if required.

Learn more about the Pit F work with our Pit F explainer and watch a Pit F work overview video here. You can call the Ascon information line at 714-388-1825 to speak with someone who will take your information for prompt follow up by an Ascon team member. Your calls are shared with regulatory agencies for transparency on the Ascon project.


  • MAINTENANCE: Regular maintenance will be conducted within the Site and around the perimeter fence areas. Workers and equipment will be in the southeast area of the Site installing sound mitigation panels.

    You may see: Workers will conduct minor grading in select onsite areas for sound mitigation features and as part of Pit F excavation work preparations.

  • PIT F EXCAVATION PREPARATIONS: Workers inside the large white tent on the east side of Ascon near Magnolia Street are preparing for excavation of Pit F. The air treatment system, which will operate 24/7 during excavation, may be turned on and off as sound mitigation is completed. Site security continues 24/7 and personnel that monitor Pit F equipment and systems will be on location overnight.

    You may see: You may see flashlights or headlights from a limited number of vehicles at night conducting inspections and providing security at the 38-acre Site. 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: A low-level hum for the air treatment system, which has been mitigated with 20-foot and 8-foot sound panels and sound blanketing in addition to the 16-foot sound wall along Magnolia Street. This is tested to confirm compliance with local ordinances for residential areas. This system is required to operate 24/7 during the duration of Pit F work to maintain a vacuum environment and treat air inside the tent for workers and our neighbors. You may hear periodic sounds during work hours, like vehicle backup signaling required for worker safety. Workers will minimize backing up vehicles when possible and when it is safe for workers and equipment.

  • SECURITY: 24-hour onsite security continues. Security is not always visible at the entrance gates. The Ascon security personnel patrol within the Site conducting nighttime patrols of the 38-acre property, and also provide gate security during work hours. In addition to 24/7 onsite security, there are regular visits by air quality technicians, Site inspectors and Site maintenance personnel. During Pit F active work there  is overnight equipment monitoring personnel onsite.


    • 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. The latest inspection occurred on June 11th.
    • 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.

Where to find Pit F telemetry air monitoring data: Near real-time air monitoring data during working hours from the Pit F area is being shared during mobilization and excavation phases on the Pit F Telemetry Air Monitoring webpage.

Where to find 24/7 air monitoring data and live stream weather: Sitewide and neighborhood air monitoring data and live streaming weather conditions from the Ascon site are found on the Actively Monitoring Air Quality page on asconhb.com. 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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