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Cascade Grain Ethanol Facility

Cascade Grain Ethanol Facility
Clatskanie, Oregon

GRI served as the geotechnical engineer of record for the largest ethanol plant on the West Coast, which was planned to produce ethanol from 40 million bushels of corn that would arrive at the plant by trains from the Midwest. Subsurface conditions at the site included significant thickness of highly compressible organic material overlying loose, liquefiable sands. As the geotechnical consultant for the design-build team, GRI evaluated subsurface conditions at the site and developed recommendations to mitigate significant static and seismically induced settlements for the settlement-sensitive building and pipeline structures. GRI personnel provided engineering review and weekly construction observation services during the installation of over 6,000 stone columns to mitigate liquefaction and lateral spreading at the site. Construction-phase services also included biweekly evaluation of instrumented surcharge-induced settlements. GRI completed design of a shoring/dewatering system for a 300- by 160-ft excavation up to 15 ft below the adjacent Bradbury Slough and Columbia River level.

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