PSE’s plant infrastructure is intentionally located to the south of the old tank farm location to minimize the potential of encountering contaminated soil and groundwater. Soil removed from the site is tested to make sure it meets non-hazardous standards before being taken to a landfill. Between January and June of 2017, 90,000 tons of soil were drilled out during the installation of the concrete columns. Environmental sampling of drill cuttings found no indication of intersection with the Occidental Chemical site plume or the Alexander Avenue Tank Facilities petroleum plume.

All 90,000 tons of cuttings were taken to LRI Landfill in Pierce County for disposal. The ground surface over the petroleum impacted area is currently paved and will remain paved.

PSE has been using the area to stage construction equipment. The facility is required to undergo environmental review and receive permits and approvals from several local, state and federal agencies. More than two dozen permits come from the City of Tacoma. You can find the status of those permits by clicking on the Current Development Permit Statuses header at the top of the City’s project permit page.įederal standards require the facility to be designed and built to ensure that a spill or fire would have no offsite impacts.

Spill and fire scenarios in the environmental review used methodologies and computational models prescribed by the Pipeline and Hazardous Materials Safety Administration and approved on similar facilities.

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