Concerns Raised about Muck

This report on the Reusable Tunnel Material (aka Muck) from the June 2020 meeting of the Stakeholder Engagement Meeting was provided by the Locke SEC member.


“At the June 24th meeting, DCA pointed out that 6 to 15 million cubic yards of soil will be generated yet the tunnel project will require 20 million cubic yard of soil fill at various project sites for various project features. The RTM generated will not be enough for the project’s own use.”

But the SEC members are not convinced. “SEC members are still pressing for more information. Subject matter of toxicity in the soil, DTSC (Department of Toxic Substance Control) under CalEPA and other agencies will be brought in to monitor. SEC members queried that even some of the substance either does not exceed the standard threshold or at the level of natural occurrence, it still does not mean it is healthy to the public. For example arsenic in the rivers of the Central Valley at the natural occurrence level is always a problem. The DCA agreed with this issue and assured further studies will be carried out.”

“At the same time, more studies on the health safety issue of the conditioner will be carried out. The conditioner is a formula that they out into the RTM to make it more workable for the geotechnical requirement of the various project sites.”

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