The Department of Toxic Substances Control (DTSC) conducts weekly Site visits and will be onsite daily to observe Pit F excavation work. Pit F mobilization currently is being conducted and excavation work is scheduled to begin July 6th.

You can sign up to receive DTSC’s Ascon updates by visiting https://www.envirostor.dtsc.ca.gov/public/, searching “Ascon” and clicking “Sign Up for Email Alerts” at the top hand right corner of the Ascon webpage.


  • MAINTENANCE: Regular maintenance will be conducted within the Site and around the perimeter fence areas, including gate areas.

  • PIT F EXCAVATION PREPARATIONS: Workers inside the large white tent 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: Workers conduct minor grading in select onsite areas near the large white Pit F tent to prepare for excavation work. 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, and storage bins, may be arriving or be removed from the Site. This includes workers, materials and large equipment entering the Pit F tent. No excavation work is occurring this week. This activity includes turning on equipment like the air treatment system for operational checks, testing entry chamber doors, and movement of large bins in and out of the tent as a process and equipment check.

    Multiple trucks will be arriving onsite with roll off bins and clean soils for use during active work. The roll off bins are being staged within the Ascon Site prior to excavation work. Haul trucks bringing clean soils into Ascon will depart empty from the Magnolia Street gate.

    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. Acoustical engineers have conducted sound metering in multiple neighborhood locations 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.
    • 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 and opening by the City of Huntington Beach of a skate park during June 2021. There is planned renovation work occurring at Eader Elementary School this summer, which includes construction and painting.


The California Department of Toxic Substances Control (DTSC) has permitted a brief pause on daily air sampling and monitoring both onsite and at offsite locations prior to the start of Pit F excavation work to allow our personnel to be with their families over the Fourth of July holiday. The pause begins Friday, July 2, at approximately 7 a.m. and air monitoring will resume on Tuesday, July 6, at approximately 7 a.m. Onsite security continues 24/7 during this pause.

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 and ongoing protocols and procedures to maintain job safety. 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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