Work Notice: October 26th, November 13th-17th

October 19, 2023

Under the oversight of the Department of Toxic Substances Control (DTSC), the responsible party’s (University of California, Berkeley) environmental consultants will be conducting an environmental investigation at the Site. Work on October 26, 2023 consists of the removal of piezometer DHR; this work is permitted by Contra Costa County. The work from November 13 through 17, 2023 involves sampling for PCBs near the former Mercury Fulminate Area. Both areas are shown on the figure below.

What Work Will Be Done?

  • The DHR piezometer removal involves a drilling rig boring through the piezometer, removing the well materials, and grouting the empty hole to the surface. The driller will have 2 staff present, and UC Berkeley will have one staff from our environmental consultant Tetra Tech for sampling and oversight. Drill cuttings will be drummed and remain on site until and removed following receipt of the soil profile. The work will be conducted on October 26 from 8:00 am to noon.
  • The PCB investigation involves a truck mounted direct-push technology sampling mechanism. Soil removed from the boreholes will be sampled and the excess soil will be contained in drums. The drums will be stored onsite and removed following receipt of sample results. The driller will have 2-3 staff, and Tetra Tech will have will have 2-3 staff from our environmental consultant Tetra Tech for sampling and oversight. Work will begin during the week of November 13 and is expected to take 5 working days.

All work will be completed during normal business hours (7:00 AM to 6:00 PM).

You may review Site information on DTSC’s EnviroStor website:

Map of investigation.