Stiles Mill and Providence Mine – Nevada City, CA

On behalf of the Sierra Streams Institute and the City of Nevada City, H&K performed predictive human health risk assessment and engineering evaluation of the historic Stiles Mill site and Providence Mine site, located on Deer Creek in Nevada City. The HHRAs supported two USEPA Brownfields cleanup grants that were performed in 2014 and 2015. H&K evaluated alternative geotechnical slope stabilization techniques to address mine waste and mill tailings that resided at their angle of repose above the creek. The HERAs were approved by USEPA Toxicologist Patrick Wilson with no revisions required.